tiu chuán viẻt nam tcvn 6259 -3 : 2003 qui phm phàn cảp vĂ ẵĩng tĂu bièn vị thắp phÃn hỴ thâng mŸy t¡u Rules for the Classification and Construction of Sea-going Steel Ships Part Marchinery Installations Chừỗng Qui ½Ùnh chung 1.1 Qui ½Ùnh chung 1.1.1 Ph−m vi p dũng Nhựng yu cÃu ca Chừỗng nĂy ½õìc Ÿp dịng cho mŸy chÏnh, thiỈt bÙ trun ½ỉng, hẻ trũc, chàn vt, ẵổng cỗ dạn ẵổng khỏng phăi lĂ my chẽnh, nói hỗi v.v , thiặt b ẵõt chảt thăi, bệnh chu p lỳc, my phũ, hẻ thõng õng vĂ cc hẻ thõng ẵiậu khièn chợng (sau ẵày, Chừỗng nĂy gi chung lĂ "hẻ thõng my") õi vối hẻ thõng my lp ẵt trn tĂu cĩ vùng hot ẵổng hn chặ hoc lp trn cc tĂu nhÞ, mỉt sâ u c·u Ph·n n¡y cÜ thÌ ½õìc thay ½äi theo cŸc yÅu c·u ½õìc qui ½Ùnh Chừỗng 20 vĂ cĩ thè thay ẵọi mổt cch hỡp lỷ nặu ẵừỡc ng kièm xem xắt vĂ chảp nhn 1.1.2 Thay thặ từỗng ẵừỗng Hẻ thõng my khỏng phï hìp vèi nhùng yÅu c·u cða Ph·n n¡y cÜ thè củng ẵừỡc chảp nhn nặu chợng ẵừỡc ng kièm cỏng nhn lĂ từỗng ẵừỗng vối cc yu cÃu ẵừỡc qui ẵnh PhÃn nĂy 1.1.3 Hẻ thõng my cĩ ẵc ẵièm thiặt kặ mối Hẻ thõng my cĩ cc ẵc ẵièm thiặt kặ mối cĩ thè ẵừỡc chảp nhn nặu nhừ chợng thịa mơn cc yu cÃu bọ sung vậ thiặt kặ vĂ ngừội thiặt kặ phăi ẵừa cŸc quy trÖnh thø ngo¡i cŸc quy trÖnh thø PhÃn nĂy vối kặt quă thứ ẵt yu cÃu ca ‡¯ng kiÌm 1.1.4 Søa ½äi cŸc u c·u ‡âi vèi hỴ thâng mŸy, hỴ thâng âng v¡ hỴ thâng ẵiậu khièn chợng dừối ẵày, cĩ thè sứa ẵọi mổt sõ yu cÃu ca PhÃn nĂy nặu ng kièm thảy cĩ thè chảp nhn ẵừỡc (1) cỗ dạn ẵổng nhị dùng ẵè lai my pht ẵiẻn hoc my phũ (bao góm că thiặt b truyận ẵổng vĂ hẻ trũc) ; (2) MŸy phị ½Ì l¡m h¡ng v¡ cŸc ½ỉng cỗ dạn ẵổng chợng ; (3) Hẻ thõng my ẵừỡc ng kièm xem xắt vĂ thảy phù hỡp vậ cỏng suảt, mũc ẵẽch vĂ ẵiậu kiẻn lĂm viẻc 1.1.5 Thut ngự Trong PhÃn nĂy, my phũ ẵừỡc phàn loi th¡nh nhùng nhÜm sau : Khi cŸc mŸy phị liỴt k tữ (1) ẵặn (5) dừối ẵày ẵừỡc dùng vĂo nhiậu mũc ẵẽch thệ chợng phăi ẵừỡc xặp vĂo loi my phũ quan trng hỗn (1) My phũ cÃn thiặt cho mŸy chÏnh MŸy phị ½õìc sø dịng ½Ì phịc vũ my chẽnh tcvn 6259 -3 : 2003, Chừỗng (2) MŸy phị dïng ½Ì ½iËu ½ỉng v¡ an to¡n MŸy phị dïng v¡o mịc ½Ïch ½iËu ½ỉng t¡u an toĂn vĂ my phũ dùng ẵè ẵăm băo an to¡n cho t¡u v¡ sinh m−ng ngõéi trÅn t¡u (3) MŸy phị dïng ½Ì l¡m h¡ng MŸy phị dïng ẵè bõc, dở hĂng củng nhừ ẵè băo quăn hĂng hÜa (4) MŸy phò chuyÅn dòng MŸy phò dïng v¡o cc hot ẵổng ẵc biẻt tĂu hot ẵổng trn bièn hoc bặn căng (5) My phũ khc Cc my phũ khỏng thuổc tữ (1) ẵặn (4) nu trn Hẻ trũc chàn vt Hẻ trũc chàn vt lĂ hẻ góm trũc ẵáy, trũc trung gian, trũc chàn vt, cc ọ ẵở trũc vĂ chàn vt 1.1.6 Băn v vĂ tĂi liẻu trệnh duyẻt Băn v vĂ tĂi liẻu trệnh duyẻt lin quan ẵặn hẻ thõng my phăi phù hỡp vối cc yu cÃu qui ẵnh tững Chừỗng ca PhÃn nĂy 1.2 Vt liẻu 1.2.1 Chn vt liỴu Vºt liỴu theo u c·u cða Ph·n 7A ca Qui phm nĂy Vt liẻu dùng chặ to hẻ thõng my phăi ẵừỡc chn theo nhựng qui ẵnh ca tững Chừỗng PhÃn nĂy xuảt pht tữ nhựng vt liẻu thoă mơn yu cÃu từỗng ửng qui ẵnh PhÃn 7A ca Qui phm nĂy, cĩ xắt ẵặn mũc ẵẽch vĂ ẵiậu kiẻn lĂm viẻc ca chợng Vt liẻu khc Vt liẻu dùng chặ to hẻ thõng my khỏng ẵừỡc qui ẵnh Chừỗng nĂy phăi thịa mơn nhựng qui ẵnh (1) vĂ (2) sau ẵày : (1) Vt liẻu ẵừỡc sứ dũng lĂm my chẽnh, hẻ thõng truyận ẵổng, hẻ trũc, chàn vt, nói hỗi, bệnh chu p lỳc, hẻ thõng ẵiậu khièn vĂ cc qui ẵnh vậ vt liẻu cho my phũ cÃn thiặt cho mŸy chÏnh, mŸy phị ½Ì ½iËu ½ỉng v¡ an to¡n vĂ cc my phũ dùng ẵè lĂm hĂng phăi phù hỡp vối cc yu cÃu ca Tiu chuán Viẻt nam ho´c cŸc tiÅu chu¸n m¡ ‡¯ng kiÌm cho l¡ phï hỡp (2) Vt liẻu ẵừỡc sứ dũng lĂm my phũ trữ my phũ cÃn thiặt cho my chẽnh, my phũ dïng ½Ì ½iËu ½ỉng v¡ an to¡n, mŸy phị dïng ½Ì l¡m h¡ng (sau ½µy ½õìc gài l¡ "mŸy phị chuyn dũng") vĂ vt liẻu dùng cho thiặt b truyận ẵổng lin quan ẵặn chợng, hẻ trũc, hẻ thõng ẵừộng õng vĂ hẻ thõng ẵiậu khièn phăi ẵừỡc chn lỳa trn cỗ sờ xem xắt mũc ẵẽch vĂ ẵiậu kiẻn lĂm viẻc ca chợng 1.3 Nhựng yu cÃu chung vậ hẻ thõng my tĂu 1.3.1 Qui ẵnh chung Hẻ thõng my phăi ẵừỡc thiặt kặ vĂ chặ to phù hỡp vối mũc ẵẽch sứ dũng ẵơ dỳ ẵnh, phăi ẵừỡc lp ẵt vĂ băo vẻ cho cĩ thè giăm ẵặn mửc tõi ẵa nguy hièm cho ngừội trn tĂu nhộ quan tàm ẵợng mửc ẵặn cc bỉ phºn chun ½ỉng, bË m´t bÙ ½ât nÜng v¡ cc nguy hièm khc Khi thiặt kặ phăi quan tàm ½Ỉn mịc ½Ïch sø dịng dú kiỈn cða thiỈt bÙ, ẵiậu kiẻn lĂm viẻc ca thiặt b củng nhừ ẵiậu kiẻn mỏi trừộng trn tĂu Nặu cc my sau ẵày ẵừỡc lp ẵỗn chiặc trn tĂu thệ phăi xem xắt ẵc biẻt ẵặn ẵổ tin cy vĂ cc chi tiỈt cða mŸy ‡âi vèi t¡u sø dịng lo−i mŸy khỏng thỏng dũng lĂm my chẽnh vĂ hẻ trũc chàn vÙt, ‡¯ng kiÌm cÜ thÌ yÅu c·u trang bÙ thÅm thiặt b my ẵè ẵăm băo cho tĂu cĩ thè chy tõc ẵổ hĂnh hăi ẵừỡc trừộng hỡp mŸy bÙ sú câ tcvn 6259 -3 : 2003, Chừỗng (1) TĂu lp ẵổng cỗ i--den : cỗ i--den dùng lĂm my chẽnh, khốp ẵĂn hói, hổp giăm tõc vĂ hẻ trũc chàn vt (2) TĂu lp tua bin hỗi nừốc : cỗ tua bin hỗi nừốc dùng lĂm my chẽnh, nói hỗi chẽnh, bÃu ngừng chẽnh, hổp giăm tõc vĂ hẻ trũc chàn vt (3) TĂu lp tua bin khẽ : cỗ tua bin khẽ ẵừỡc sứ dũng lĂm my chẽnh, my nắn khẽ, buóng ẵõt, hổp giăm tõc vĂ hẻ trũc chàn vt (4) TĂu lp thiặt b ẵáy bng ẵiẻn : cỗ lai chàn vt, hổp giăm tõc vĂ hẻ trũc chàn vt Nặu trn tĂu lp thiặt b ẵáy bng ẵiẻn thệ phăi trang b hai my pht ẵiẻn trờ ln Phăi trang b phừỗng tiẻn mĂ nhộ ½Ü cÜ thÌ giù ½õìc ho´c phịc hãi l−i ½õìc sỳ lĂm viẻc bệnh thừộng ca my chẽnh că mỉt cŸc mŸy phị quan tràng kháng l¡m viẻc c biẻt, cÃn lừu ỷ ẵặn cc sỳ cõ ca cc thiặt b sau ẵày : (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) Còm mŸy phŸt lĂm nguón cung cảp ẵiẻn chẽnh ; Nguón cung cảp hỗi nừốc ; Hẻ thõng cảp nừốc nói hỗi ; Hẻ thõng cảp dÃu ẵõt dùng cho nói hỗi hoc ẵổng cỗ ; Nguón to p lỳc dÃu bỏi trỗn ; Nguón to p lỳc nừốc ; Bỗm nừốc ngừng tũ vĂ thiặt b ẵè trệ ẵổ chàn khỏng bÃu ngừng ; Nguón cảp khỏng khẽ cừởng bửc cho nói hỗi ; My nắn khỏng khẽ vĂ bệnh chửa khẽ nắn dùng vĂo mũc ẵẽch khời ½ỉng ho´c ½iËu khiÌn ; CŸc thiỈt bÙ thðy lúc, khẽ nắn hoc ẵiẻn ẵè ẵiậu khièn ẵừỡc dùng my chẽnh bao góm că chàn vt biặn bừốc Tuy nhin, qua xem xắt ẵổ an toĂn tọng thè, cĩ thè chảp nhn cho phắp giăm mửc ẵổ nhảt ẵnh cỏng suảt ẵáy tĂu so vối trng thi hot ẵổng bệnh thừộng ca tĂu Phăi trang b cho tĂu cc phừỗng tiẻn ẵè ẵăm băo cho hẻ thõng my tĂu cĩ thè hot ẵổng ẵừỡc tữ trng thi tĂu chặt mĂ khỏng cÃn cĩ sỳ hồ trỡ tữ bn ngoĂi NgoĂi ra, hẻ thõng khời ẵổng kặt hỡp vối cc my khc phăi ẵừỡc bõ trẽ cho cÜ thÌ khêi ½ỉng ½õìc mŸy chÏnh ½Ì ch−y t¡u tữ trng thi tĂu chặt, phm vi 30 phợt sau bÙ m¶t n¯ng lõìng to¡n t¡u ‡ỉng cỗ chẽnh lai chàn vt, ẵổng cỗ dạn ẵổng my pht ẵiẻn, my phũ (trữ my phũ chuyn dũng v.v ), cc ẵổng cỗ dạn ẵổng nĂy phăi ẵừỡc thiặt kặ ẵè lĂm viẻc cc ẵiậu kiẻn nhừ qui ẵnh Băng 3/1.1 ẵừỡc lp trn tĂu Cĩ thè cho phắp sai lẻch so vối gi tr gĩc ẵừỡc qui ẵnh Băng 3/1.1 trn cỗ sờ xem xắt kièu tĂu, kẽch thừốc tĂu vĂ ẵiậu kiẻn lĂm viẻc ca tĂu Hẻ thõng my phăi ẵừỡc thiặt kặ ẵè lĂm viẻc tõt ẵiậu kiẻn nhiẻt ẵổ ẵừỡc qui ẵnh Băng 3/1.2 Phăi cĩ biẻn php nhm to ẵiậu kiẻn d dĂng cho viẻc vẻ sinh, kièm tra vĂ băo dừởng hẻ thõng my Phăi ẵc biẻt quan tàm ẵặn thiặt kặ, chặ to vĂ lp ẵt hẻ thõng my cho khỏng ẵè xăy hiẻn từỡng dao ẵổng gày nn ửng suảt lốn dăi lĂm viẻc bệnh thừộng 1.3.2 Cỏng suảt lùi Phăi băo ẵăm ẵ cỏng suảt chy lïi nh±m trƯ sú ½iËu khiÌn t¡u mài trng thi lĂm viẻc bệnh thừộng cỗ chẽnh lai chàn vt phăi cĩ khă nng trệ hĂnh trƯnh ch−y lïi Ït nh¶t b±ng 70% sâ vÝng quay chy tiặn thội gian ẽt nhảt lĂ 30 phợt Cỏng suảt lùi cĩ thè ẵừỡc to khoăng thội gian chuyèn tiặp cho cĩ thè hơm ẵừỡc tĂu khoăng thội gian hỡp lỷ õi vối mŸy chÏnh lai chµn vÙt qua hỉp sâ, chµn vÙt biặn bừốc hoc thiặt b lai chàn vt bng ẵiẻn thệ viẻc chy tcvn 6259 -3 : 2003, Chừỗng lùi khỏng ẵừỡc lĂm cho my chẽnh lai chàn vt b qu tăi Băng 3/1.1 Gĩc nghing (2) Giựa t¡u GÜc nghiÅng GÜc nghiÅng ½ỉng tØnh (‡ỉ chÝng (‡ỉ nghing) chĂnh ngang) Kièu hẻ thõng my - cỗ chẽnh lai chàn vt - Nói hỗi chẽnh vĂ nói hỗi phũ quan trng; - cỗ dạn ẵổng my pht ẵiẻn (trữ cc ẵổng cỗ sỳ cõ) my phũ (trữ my phũ chuyn dũng ) vĂ cc my dạn ẵổng chợng - Thiặt b sỳ cõ (my pht sỳ cõ, bỗm cửu hịa sỳ cõ vĂ ẵổng cỗ dạn ẵổng chợng) - Cỗ cảu chuyèn mch(1) (cÃu dao ngt mch v.v ) - Thiặt b ẵiậu khièn tỳ ẵổng vĂ ẵiậu khièn tữ xa Mủi vĂ ẵuỏi tĂu(2) Gĩc nghing Gĩc nghing ẵổng tỉnh (ổ chíng (ổ chợi) chĂnh dàc) 15o 22,5o 5o 7,5o 22,5o (3) 22,5o (3) 10o 10o Chợ thẽch : (1) ặn gĩc nghing 45o, khỏng ½õìc cÜ cŸc thao tŸc sai viỴc ½Üng m−ch hoc chuyèn mch (2) Cĩ thè xáy ẵóng thội ½ỉ nghiÅng ê giùa t¡u, mđi v¡ ½i t¡u (3) ‡âi vèi t¡u chê xá khÏ hÜa lÞng v¡ t¡u chờ xỏ hĩa chảt nguy hièm, phăi cĩ thiặt b cho vạn cĩ thè trệ ẵừỡc sỳ cung c¶p n¯ng lõìng sú câ bƯnh thõén t¡u cÜ ẵổ nghing giựa tĂu ln ẵặn mửc lốn nhảt lĂ 30o Băng 3/1.2 Khỏng khẽ Nừốc bièn Nhiẻt ẵổ lĂm viẻc Nỗi lp ẵt khu vỳc kẽn Cc chi tiặt my hoc nói hỗi cc khoang cĩ nhiẻt ½ỉ võìt o o quŸ 45 C v¡ dõèi C Trn boong hờ - o Nhiẻt ẵổ ( C) ẵặn 45 (*) Tùy theo ẵiậu kiẻn ring cũc bổ -25 ẵặn 45 (*) 32 (*) Chợ thẽch : (*) ng kièm cĩ thè chảp nhn nhiẻt ẵổ khc nặu thảy phù hỡp nhừng khỏng p dũng cho tĂu cĩ vùng hot ẵổng khỏng hn chặ 1.3.3 Giối hn viẻc sứ dũng dÃu ẵõt Giối hn viẻc sứ dũng dÃu ẵõt phăi thoă mơn cc yu cÃu 4.2.1, Ph·n cða Qui ph−m n¡y 1.3.4 10 Phíng chy Hẻ thõng my phăi ẵừỡc bõ trẽ vĂ lp ẵt cho khỏng ẵè rí rì dÃu ẵõt, dÃu bỏi trỗn vĂ cc loi dÃu d chy khŸc ‡âi vèi cŸc mŸy mÜc bÙ rÝ r× d·u thệ phăi trang b phừỗng tiẻn ẵăm băo dạn dÃu rí rì vĂo nỗi chửa an tcvn 6259 -3 : 2003, Chừỗng toĂn Hẻ thõng my phăi ẵừỡc bâ trÏ v¡ l°p ½´t cho kháng ½Ì rÝ rì khẽ ẵổc hi hoc khẽ d chy cĩ thè gày hịa hon õi vối hẻ thõng my b rí rì khẽ thệ phăi ẵừỡc lp ẵt khoang ẵừỡc thỏng giĩ tõt cĩ khă nng xă sch nhanh khÏ n¡y Ngo¡i cŸc yÅu c·u ê 1.3.4, viẻc phíng chy phăi tuàn theo cc yu cÃu 4.2 v¡ 5.2, Ph·n cða Qui ph−m n¡y 1.3.5 HỴ thâng tháng giÜ cho bng mŸy Bng mŸy lo−i A phăi ẵừỡc thỏng giĩ tõt ẵè ẵăm băo my mĩc hoc nói hỗi bn hot ẵổng chặ ẵổ toĂn tăi mi ẵiậu kiẻn thội tiặt bao góm că thội tiặt xảu nhảt, phăi trệ chặ ½ỉ cung c¶p ½ð kháng khÏ cho bng mŸy nh±m ẵăm băo an toĂn vĂ thun lỡi cho thỡ my v¡ sú ho−t ½ỉng cða mŸy mÜc CŸc bng mŸy khc phăi ẵừỡc thỏng giĩ tõt phù hỡp vối mũc ẵẽch sứ dũng ca buóng my 1.3.6 Ngn ngữa tiặng ón Phăi cĩ biẻn php lĂm giăm tiặng ón ca my mĩc buóng my nhm thịa mơn tiu chuán cĩ thè chảp nhn ẵừỡc theo qui ẵnh ca lut quõc gia ca nừốc ẵng kỷ tĂu Nặu tiặng ón nĂy khỏng thè giăm ẵặn mửc chảp nhn ẵừỡc thệ nguón gày tiặng ón mnh phăi ẵừỡc cch ly hoc cch àm hoc phăi trang b buóng cch ly tiỈng ãn nỈu nhõ u c·u cÜ ngõéi trúc buóng my Nặu cÃn thiặt, phăi trang b dũng cũ bt tai chõng ón cho thỡ my phăi lĂm viẻc bng mŸy cÜ tiỈng ãn quŸ mưc nhõ vºy 1.3.7 Tháng tin liÅn l−c giùa l·u lŸi v¡ cc trm ẵiậu khièn tõc ẵổ vĂ hừống ẵáy ca chµn vÙt Tháng tin liÅn l−c giùa l·u lŸi v¡ cc trm ẵiậu khièn tõc ẵổ vĂ hừống ẵáy ca chàn vt phăi thịa mơn cc yu cÃu sau ẵày : (1) ẽt nhảt phăi trang b hai phừỗng tiẻn ẵổc lp ẵè truyận lẻnh tữ lÃu li ẵặn v trÏ bng mŸy ho´c bng ½iËu khiÌn thõéng ½õìc sø dịng ½Ì ½iËu khiÌn tâc ½ỉ v¡ hõèng ẵáy ca chàn vt Mổt nhựng phừỗng tiẻn nĂy phăi lĂ tay chuỏng truyận lẻnh buóng my Tay chuỏng nĂy phăi ẵăm băo truyận ẵt rò rĂng lẻnh ẵừỡc pht tữ lÃu li vĂ sỳ tră lội tữ trm ẵiậu khièn nu trn (2) Phừỗng tiẻn thỏng tin lin lc, ng kièm thảy cÃn thiặt, phăi ẵừỡc trang b tữ lÃu li vĂ buóng my ẵặn bảt kỹ nỗi nĂo ngoĂi nhựng yu cÃu qui ẵnh (1) trn ẵày, tữ ẵĩ cĩ thè kièm sot tõc ẵổ vĂ hừống ẵáy ca chàn vt 1.3.8 Chuỏng bo ẵổng cho sỉ quan my Phăi trang b mổt chuỏng bo ẵổng cho sỉ quan my ẵừỡc thao tc tữ buóng ẵiậu khièn my hoc tữ trm ẵiậu ẵổng thảy thẽch hỡp vĂ phăi nghe rò buóng cða sØ quan mŸy 1.3.9 Hõèng d¹n sø dịng v¡ băo dừởng my mĩc vĂ thiặt b ca tĂu Phăi trang b cho tĂu tĂi liẻu hừống dạn sứ dũng vĂ băo dừởng my mĩc vĂ trang thiặt b quan trng cho an toĂn ca tĂu TĂi liẻu nĂy phăi ½õìc viỈt b±ng ngán ngù cÜ thÌ hiÌu ½õìc bêi nhựng sỉ quan vĂ thuyận vin cÃn phăi hièu nhựng thỏng tin ẵĩ thỳc hiẻn nhiẻm vũ 1.4 Thứ nghiẻm 1.4.1 Thứ ti xừờng Trừốc lp ẵt trÅn t¡u, thiỈt bÙ v¡ cŸc chi tiỈt t−o nÅn hẻ thõng my (trữ my phũ chuyn dũng v.v ) phăi ẵừỡc thứ ti NhĂ my cĩ my mĩc vĂ trang thiặt b cÃn thiặt cho thứ nghiẻm (sau ẵày gài l¡ "Thø t−i xõêng") phï hìp vèi cŸc yÅu cÃu từỗng ửng PhÃn nĂy õi vối trang thiỈt bÙ v¡ cŸc chi tiỈt cða mŸy mÜc, mồi Chừỗng ca PhÃn nĂy khỏng qui ẵnh yu cÃu thø t−i xõêng v¡ cŸc chi tiỈt cða mŸy phị chuyn dũng v.v thệ cc bin băn thứ ca NhĂ chặ to củng phăi 11 tcvn 6259 -3 : 2003, Chừỗng ẵừỡc trệnh cho ng kièm cĩ yu cÃu 1.4.2 Trang thiặt b săn xuảt hĂng lot Bảt kè nhựng yu cÃu qui ẵnh 1.4.1-1 trn ẵày, ẵõi vối trang thiặt b ẵừỡc săn xuảt theo hẻ thõng săn xuảt hĂng lot, ng kièm thảy phï hìp, thƯ cÜ thÌ ch¶p nhºn qui trƯnh thø từỗng ửng vối phừỗng php săn xuảt theo yu cÃu cða Nh¡ chỈ t−o thay cho cŸc u c·u thø nghiẻm ẵừỡc qui ẵnh Qui phm 1.4.3 Min thứ nghiẻm Nặu nhừ Giảy chửng nhn thứ hẻ thõng my cÜ nỉi dung phï hìp vèi u c·u cða ‡¯ng kiÌm thƯ ‡¯ng kiÌm cÜ thÌ bÞ qua mỉt ph·n hay toĂn bổ cc cuổc thứ nghiẻm ẵõi vối my mÜc qui ½Ùnh ê 1.4.1 1.4.4 Thø sau l°p ẵt trn tĂu My mĩc phăi ẵừỡc thứ nghiẻm sau l°p ½´t lÅn t¡u phï hìp vèi cŸc yu cÃu ẵừỡc qui ẵnh tững Chừỗng ca PhÃn nĂy Cc my phũ ẵè sứ dũng ring nặu ng kièm thảy cÃn thiặt thệ phăi thứ hot ẵổng vĂo mổt dp thẽch hỡp trừốc chợng ẵừỡc sứ dũng ẵè xc ẵnh rng chợng khỏng gày nguy hièm cho t¡u v¡ thuyËn viÅn trÅn t¡u Khi th¶y cÃn thiặt, ng kièm cĩ thè yu cÃu cc viẻc thứ khc vối cc viẻc thứ ẵơ qui ẵnh PhÃn nĂy 12 tcvn 6259 -3 : 2003, Chừỗng Chừỗng cỗ i--den 2.1 Qui ẵnh chung 2.1.1 Phm vi p dũng Cc yu cÃu ca Chừỗng nĂy p dũng cho cc ẵổng cỗ i--den ẵừỡc dùng l¡m mŸy chÏnh ho´c ½õìc dïng ½Ì lai mŸy phŸt ½iỴn v¡ cŸc mŸy phị (kháng kÌ mŸy phị chun dũng v.v ) nu Chừỗng nĂy õi vối cc ẵổng cỗ i--den lai my pht ẵiẻn sỳ cõ, thƯ ngo¡i cŸc u c·u ê Ph·n n¡y (tr÷ cŸc yÅu c·u ê 2.2.4, 2.3, 2.4.1-4 v¡ yÅu c·u ½âi vối thiặt b dững hot ẵổng ca ẵổng cỗ ẵừỡc qui ẵnh 2.5.5-1) cín phăi p dũng cc yu c·u ê 3.3 v¡ 3.4, Ph·n cða Qui ph−m nĂy Trong trừộng hỡp ẵổng cỗ i--den ẵừỡc trang b thiặt b dững tỳ ẵổng thệ phăi lp ẵt thiặt b xĩa bị tc ẵổng an toĂn nĂy thịa mơn cŸc yÅu c·u ê 18.2.6-3 ‡âi vèi cŸc mŸy chẽnh lĂ ẵổng cỗ i--den ẵừỡc ẵiậu khièn bng ẵiẻn tứ, ngoĂi cc yu cÃu qui ẵnh Chừỗng nĂy cín phăi thoă mơn cc yu cÃu ring khc ca ng kièm 2.1.2 Băn v vĂ tĂi liẻu Thỏng thừộng phăi trệnh duyẻt cc băn v vĂ tĂi liẻu sau : (1) Cc băn v vĂ tĂi liẻu ẵè duyẻt (a) Băn thuyặt minh vậ ẵổng cỗ (theo mạu ca ng kièm) (b) Băn v chi tiặt qui trệnh h¡n ½âi vèi cŸc bỉ phºn chÏnh (c) Trịc khu (góm că cc chi tiặt, bu lỏng nõi trũc, cc ẵõi trng vĂ cc bu lỏng ghắp cht chợng) (d) Thanh truyận vĂ cc ọ ẵở (kè că cc bu lỏng vĂ cc chi tiặt) ca ẵổng cỗ kỹ (e) Trũc chu lỳc ẵáy (nặu ẵóng bổ vối my) (f) Sú bâ trÏ cŸc bu láng bỴ mŸy (gãm că bu lỏng bẻ my, cn v.v ) (g) Cảu t−o v¡ sú bâ trÏ cŸc van phÝng nä thïng trịc (h) ‡´c tÏnh vºt liỴu cða cŸc bỉ phºn chẽnh (i) ừộng õng dÃu cao p ẵè dạn ẵổng xu pp xă cỗ cảu băo vẻ (j) ừộng õng dÃu ẵõt cao p cỗ cảu băo vẻ vĂ cõ ẵnh (k) Hẻ thõng ẵừộng õng lp trn ẵổng cỗ (góm că ẵừộng õng dÃu ẵõt, dÃu bỏi trỗn, dÃu lĂm mt, nừốc lĂm mt, cc hẻ thõng thðy lúc v¡ khÏ n¾n, cÜ sâ ghi kÏch thõèc, vt liẻu vĂ p suảt lĂm viẻc ca ẵừộng õng) (l) Mt ct lp rp tua bin khẽ thăi (2) Cc băn v vĂ tĂi liẻu ẵè tham khăo (a) Danh mũc cc băn v vĂ tĂi liẻu phăi trệnh duyẻt (vối sõ hiẻu băn v lin quan vĂ tệnh trng sot xắt li) (b) Mt ct dc ca ẵổng cỗ (c) Mt ct ngang ca ẵổng cỗ (d) ặ my vĂ ọ chn (nặu nĩ ẵóng bổ vối ẵổng cỗ) (e) Thàn ẵổng cỗ (f) Np xi lanh, thàn xi lanh v¡ âng lÜt xi lanh (g) PÏt táng v¡ chât pÏt táng (h) Gu dáng liÅn kỈt (kÌ că bu lỏng nõi vĂ vẽt ẵnh v) (i) Lp rŸp pÏt táng v¡ cŸn pÏt táng (j) CŸn pÏt tỏng (k) Thanh truyận vĂ cc ọ ẵở (kè că cc bu lỏng) ca ẵổng cỗ kỹ (l) Lp rŸp ä ½ë ch´n (m) L°p rŸp ½·u chù thºp (n) Cỗ cảu dạn ẵổng trũc cam vĂ sỳ lp rp cam vối trũc cam (o) Cỗ cảu xu pp (cỗ cảu van kièu ẵín) (p) Bỗm phun dÃu ẵõt 13 tcvn 6259 -3 : 2003, Chừỗng (q) (r) (s) (t) (u) (v) CŸc bu láng ä ½ë chÏnh CŸc bu láng câ ½Ùnh n°p xi lanh v¡ cŸc bu láng câ ½Ùnh hỉp van BŸnh ½¡ (½âi vèi trừộng hỡp lĂ mổt thĂnh phÃn truyận lỳc) Sỗ ẵó hẻ thõng ẵiậu khièn ẵổng cỗ (kè că cc hẻ thõng kièm tra, an toĂn vĂ tẽn hiẻu bo ẵổng) Kặt cảu vĂ bõ trẽ lốp cch nhiẻt cho õng khẽ xă lp trn ẵổng cỗ Kặt cảu vĂ bõ trẽ cc bổ giăm chản, bổ chõng rung, thiặt b càn bng hoc cỗ cảu bù chình, cc ging, cc băn tẽnh ton vậ càn bng vĂ ngn ngữa dao ẵổng ẵổng cỗ (w) Cc tĂi liẻu hừống dạn sứ dũng vĂ hĂnh ẵổng cỗ (x) Cc băn vÁ v¡ t¡i liỴu khŸc ‡¯ng kiÌm cho l¡ cÃn thiặt 2.2 Vt liẻu, kặt cảu vĂ ẵổ bận 2.2.1 Vt liẻu Vt liẻu dùng ẵè chặ to cc chi tiặt chẽnh ca ẵổng cỗ i--den vĂ viẻc thứ chợng bng phừỗng php khỏng ph hy phăi phù hỡp vối cc yu cÃu ẵừỡc qui ẵnh Băng 3/2.1 Trong trừộng hỡp thứ bng siu àm phăi trệnh kặt quă thứ cho ng kièm vin xem xắt CŸc xi lanh, pÏt táng v¡ cŸc bæ phºn khŸc chu nhiẻt ẵổ cao hoc p suảt cao vĂ cc bổ phn truyận mỏ men dạn ẵổng phăi ẵừỡc chặ to bng vt liẻu phù hỡp vối nhiẻt ẵổ vĂ tăi trng mĂ cc bổ phn ẵĩ phăi chu 2.2.2 Kặt cảu, lp ẵt vĂ qui ẵnh chung Cc xi lanh, pÏt táng v¡ cŸc bỉ phºn chÙu nhiỴt ẵổ hoc p suảt cao phăi cĩ kặt cảu phù hỡp vối ửng suảt nhiẻt vĂ ửng suảt cỗ hc mĂ chợng phăi chu Khi cc chi tiặt chẽnh ca ẵổng cỗ i--den lĂ kặt cảu hĂn thệ chợng phăi thịa mơn cc yu cÃu Chừỗng 11 Cc khung vĂ ẵặ my phăi cĩ kặt cảu cửng vựng vĂ kẽn dÃu, ẵặ my phăi ẵừỡc trang b ½ð sâ lõìng bu láng c·n thiỈt ½Ì câ ½Ùnh mŸy trÅn to¡n bỉ chiËu d¡i bỴ mŸy Thïng trũc vĂ cc cứa thùng trũc phăi cĩ ẵ ẵổ bận vĂ cc cứa thùng trũc phăi ẵừỡc bt cht cho khỏng b rội xăy bn thùng trũc Phăi gn lội cănh bo nỗi nhỏ cao, thẽch hỡp trn cứa thùng trũc că hai phẽa ca ẵổng cỗ hoc trm ẵiậu khièn buóng my Lội cănh bo nĂy phăi chì rò rng bảt cử nĂo nhiẻt ẵổ thïng trịc t¯ng quŸ cao thƯ cŸc cøa thïng trịc hoc cc lồ quan st khỏng ẵừỡc phắp mờ cho ẵặn thùng trũc nguổi ẵi sau dững ẵổng cỗ Cảm thỏng giĩ thùng trũc vĂ bõ trẽ bảt kỹ thiặt b nĂo ẵè ẵừa khỏng khẽ bÅn ngo¡i v¡o thïng trịc tr÷ trõéng hìp (1) vĂ (2) dừối ẵày : (1) Cc õng thỏng hỗi, nặu cĩ, thệ phăi ẵừỡc lĂm nhị tối mửc cĩ thè ẵừỡc ẵè giăm ẵặn mửc tõi thièu lừỡng khỏng khÏ v¡o thïng tròc sau nä Tuy nhiÅn, kháng ẵừỡc nõi chung cc õng thỏng hỗi ca hai ẵổng cỗ hoc nhiậu hỗn vối Cc õng thỏng hỗi thùng trũc ca my chẽnh phăi ẵừỡc dạn v trÏ an to¡n trÅn boong ho´c mæt vÙ trÏ khŸc ẵừỡc chảp thun (2) Khi thỳc hiẻn hợt khẽ khịi thùng trũc (chng hn ẵè pht hiẻn hỗi dÃu) thệ ẵổ chàn khỏng thùng trũc khỏng ẵừỡc vừỡt quŸ 2,5 x 10-4 MPa ‡iËu kiỴn mái trõéng ẵè xc ẵnh cỏng suảt ca cc ẵổng cỗ i--den phăi nhừ sau : - p suảt khẽ quyèn : 0,1 MPa - Nhiẻt ẵổ khỏng khẽ : 45o C - ổ ám từỗng ẵõi : 60% - Nhiẻt ẵổ nõèc biÌn (t−i cøa v¡o b·u l¡m mŸt trung gian kháng khÏ n−p) : 32oC 2.2.3 ä ½ë cä biÅn ca ẵổng cỗ kỹ ọ ẵở cọ bin ca ẵổng cỗ kỹ phăi ẵừỡc thiặt kặ vĂ chặ to cho p suảt nắn ẵậu trn bậ mt tiặp xợc ca 14 tcvn 6259 -3 : 2003, Chừỗng cc np ọ ẵở vĂ khỏng gày ửng suảt qu mửc ln cc bu lỏng ọ ẵở cọ bin, chu ẵừỡc tăi trng thay ẵọi tc dũng ln truyận Băng 3/2.1 Sứ dũng vt liẻu vĂ thứ khỏng ph hy ẵõi vối cc chi tiặt chẽnh ca ẵổng cỗ i--den Cc chi tiặt chẽnh Trũc khuýu KiÌu r¿n liËn KiÌu mŸ khuýu, cä biÅn v¡ cä trịc l°p gh¾p ho´c bŸn l°p gh¾p CŸc kiÌu khŸc (vÏ dị kiÌu h¡n) CŸn PÏt táng Thanh truyËn cïng vèi n°p ä ½ë 11 N°p xi lanh bng thắp Cc tảm, cc dÃm ọ ẵở ngang bng ặ thắp rn hoc ẵợc my kặt cảu Cc phÃn thắp ẵợc kè că cc mõi hĂn hĂn ọ chn kặt cảu hĂn, cc tảm vĂ dÃm ọ ẵở ngang lĂm bng thắp rn vĂ thắp ẵợc Cc khung vĂ thùng trũc kặt cảu hĂn 12 Thàn my kặt cảu hĂn 13 Gu dỏng lin kặt 14 Cc bnh rng bng thắp dạn ẵổng trũc cam Cc bu lỏng, vẽt cảy (dùng cho np xi lanh, ẵÃu chự thp, ä trun, ä trịc khu) CŸc ½Øa tua bin, cŸnh tua bin, cŸnh qu−t n¾n giÜ v¡ trịc rá to ca tua bin tng p khẽ thăi; trũc, rỏ to vĂ cc cnh ca my nắn tng p, trữ cŸc qu−t thäi phò ‡·u chù thºp CŸc âng, van vĂ phũ tùng lp ẵổng cỗ ẵừỡc phàn loi nhĩm I hoc nhĩm II Chừỗng 12 ì × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × PhÃn bng thắp ca õng lĩt xi lanh ì ình Pẽt tỏng bng thắp ì Bu lỏng nõi trịc khu × CŸc bÏch nâi trÅn trịc khu (nỈu réi) ‡õéng kÏnh xi lanh D (mm) D ≤ 300 300 < D ≤ 400 400 < D (1) (2) (3) (1) (2) (3) (1) (2) (3) 10 15 16 17 18 × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × × Chợ thẽch : (1) Vt liẻu dùng chặ to cc chi tiặt ẵừỡc ẵnh dảu ì cổt (1) thệ phăi thịa mơn cc yu cÃu PhÃn 7A ca Qui phm nĂy (2) Vt liẻu dùng chặ to cc chi tiặt ẵừỡc ẵnh dảu ì cổt (2) thệ phăi ẵừỡc thứ theo phừỗng php thứ bng ht tữ tẽnh hoc phừỗng php thứ bng chảt lịng thám thảu (3) Vt liẻu dùng chặ to cc chi tiặt ẵừỡc ẵnh dảu ì cổt (3) thệ phăi ẵừỡc thứ bng phừỗng php thứ siu àm 15 tcvn 6259 -3 : 2003, Chừỗng 2.2.4 Trũc lp bnh ẵĂ vĂ cŸc trịc khŸc ê chå l°p bŸnh ½¡ ho´c cŸc pu li lẻch tàm dùng cho cc bỗm trn trũc khuýu ho´c tròc phò ê giùa ä tròc cuâi cïng vĂ trũc chu lỳc ẵáy, ẵừộng kẽnh trũc phÃn trũc ẵĩ khỏng ẵừỡc nhị hỗn ẵừộng kẽnh trũc khuýu ½õìc xŸc ½Ùnh b±ng cáng thưc ê 2.3 2.3 Trịc khuýu 2.3.1 Tròc khuýu liËn ‡õéng kÏnh cä biÅn vĂ cọ trũc khỏng ẵừỡc nhị hỗn gi tr tẽnh theo cáng thöc sau : dc = {( M + ) } K KK M +T D 2 m s h Trong ½Ü : dc : ‡õéng kÏnh qui ½Ùnh cða trịc khu (mm) M = 10-2AL Pmax T = 10-2BS Pmi S : H¡nh trÖnh pẽt tỏng (mm) L : Khoăng cch giựa hai tàm ọ ẵở liận (mm) Pmax : p suảt chy lèn nh¶t xi lanh (MPa) Pmi : Ÿp su¶t cÜ Ïch ch× thÙ trung bƯnh (MPa) A v¡ B : Hẻ sõ lảy theo Băng 3/2.2 vĂ 3/2.3 ẵõi vối cc ẵổng cỗ cĩ khoăng bng (trong trừộng hỡp ẵổng cỗ chự V thệ cc khoăng trn mồi hĂng bng nhau) õi vối ẵổng cỗ i-den cĩ cc khoăng khỏng bng hoc khỏng nm cc băng trn, cc gi tr A vĂ B s ẵừỡc xem xắt cũ thè D : ừộng kẽnh xi lanh (mm) Km : Gi tr ẵừỡc lảy theo (1) hoc (2) dừối ẵày tùy theo giối hn bận kắo danh nghỉa ca vt liẻu lĂm trũc khuýu Tuy vy, gi tr ca Km ẵõi vối cc vt liẻu khỏng phăi lĂ thắp rn vĂ thắp ẵợc phăi ẵừỡc ‡¯ng kiÌm xŸc ½Ùnh måi trõéng hìp (1) Khi giối hn bận kắo danh nghỉa ca vt liẻu lốn hỗn 440 N/mm2 : Km = Ks : 440 440 + ( Ts − 440) Trong ½Ü : Ts : Gièi h−n bËn k¾o danh nghØa cða vt liẻu (N/mm2 ) Gi tr ca Ts khỏng ẵừỡc qu 760 N/mm2 ẵõi vối thắp cc bon rn vĂ khỏng qu 1080 N/mm2 ẵõi vối thắp hỡp kim thảp r¿n (2) Khi gièi h−n bËn k¾o danh nghØa cða vt liẻu khỏng lốn hỗn 440 N/mm2 nhừng khỏng dừối 400 N/mm2 ; Km = 1,0 Gi tr ẵừỡc lảy theo (1), (2) hoc (3) sau ẵày, tùy theo phừỗng php chặ to trũc khuýu (1) Khi trũc khuýu ẵừỡc chặ to bng phừỗng php ẵc biẻt ẵơ ẵừỡc ng kiÌm th÷a nhºn r±ng r¿n t−o thè liÅn tịc v¡ chảt lừỡng săn phám ọn ẵnh, ẵổ bận mịi ẵừỡc t¯ng thÅm t÷ 20% trê lÅn so vèi quŸ trƯnh r¿n tú : Ks = , 115 (2) Khi trũc khuýu ẵừỡc chặ to bng phừỗng php ẵc biẻt ẵơ ẵừỡc ng kièm thữa nhn rng ẵơ tng ẵổ cửng bậ mt vĂ chảt lừỡng săn phám ọn ẵnh, ẵổ bận mịi ẵừỡc nàng cao : 16 tcvn 6259 -3: 2003, Chapter 18 (1) A device to shut off the fuel or steam supply (this device hereinafter being referred to as "safety device") for the main propulsion machinery is not to be automatically activated except in cases, which could lead to complete breakdown, serious damage or explosion (2) The safety systems for the main propulsion machinery are to be so designed as not to lose their function or as to fail to safe, even in the event of failure of main electrical source or air source Self-reversing diesel engines At least the following safety measures are to be taken to the remote control devices for self-reversing diesel engines: (1) Starting operation is to be possible only when the camshaft is surely at the position of "ahead" or "astern" (2) During reversing operation, fuel is not to be injected (3) Reversing operation is to be conducted after "ahead" revolution is reduced to a predetermined value Main propulsion machinery of multi-engines coupled to a single shaft ship At least the following safety measures are to be taken to the remote control devices for multi-engines coupled to a single shaft: (1) Each main propulsion machinery is to be provided with an overload preventive device (2) Each main propulsion machinery is not to be subjected to an abnormally unbalanced load Main propulsion machinery with clutch At least the following safety measures are to be taken to the remote control devices for engines with clutch: (1) The clutch equipped to a main propulsion machinery in a multi-engines coupled to a single shaft is to be disengaged when the main propulsion machinery is stopped in an emergency While multi-engines are operating in different directions of rotation their clutches are not to be engaged simultaneously (2) Engaging and disengaging of clutches are to be carried out below predetermined revolutions of the main propulsion machinery (3) An overspeed protective device specified in 2.4.1-2, 3.3.1-1 or 4.3.1-1 is to be provided (4) In case where there is fear that the speed of the propulsion motor would exceed 125% of the rated revolutions when the clutch is disengaged, an overspeed protective device as deemed appropriate by VR is to be provided Main propulsion machinery driving controllable pitch propellers At least the following safety measures are to be taken to the remote control devices for engines driving controllable pitch propellers: (1) An overload preventive device is to be provided (2) Starting of engines or engaging of clutches is to be performed while the propeller blades are in a neutral position (3) An overspeed protective device as specified in 2.4.1-2, 3.3.1-1 or 4.3.1-1 is to be provided (4) In case where there is fear that the speed of the propulsion motor would exceed 125% of the rated revolutions when the propeller pitch is altered, an overspeed protective device as deemed appropriate by VR is to be provided 18.4 Automatic and remote control of boilers 18.4.1 General The systems of automatic control for both combustion and feed water of oil-fired boilers are to comply with the requirements in 18.4.2 to 18.4.5 respectively The systems of automatic control for either combustion or feed water of oil-fired boilers are to comply with the relevant requirements in 18.4.2 or 18.4.3 as well as the requirements in 18.4.4 and 18.4.5 Automatic control of boilers other than oil-fired boilers or having a special feature is to be deemed appropriate by VR 194 Tcvn 6259 -3: 2003, Chapter 18 In case where boilers are remotely controlled, control devices and monitoring devices necessary for the operation of the boilers are to be provided at the relevant control stations Remote water level indicators are to comply with the requirements in 9.9.8 18.4.2 Automatic combustion control systems General Automatic combustion control systems are to comply with the following requirements: (1) The automatic combustion control systems are to be able to control so as to obtain planned steam amount, steam pressure and steam temperature and to secure stable combustion (2) The devices to control the fuel supply to meet the load imposed are to be capable of ensuring stable combustion in the controllable range of fuel supply (3) Where combustion control is carried out according to the pressure of the boiler, the upper limit of this pressure is to be lower than the set pressure of the safety valves Combustion control devices for intermittent operation The combustion control devices for intermittent operation are to comply with the following requirements and they are to operate according to the planned sequence: (1) Before ignition on the pilot burner or before ignition on the main burner if the pilot burner is not fitted, the combustion chamber and the flue are to be prepurged by air of not less than times the volume of the combustion chamber and the flue up to the boiler uptake For small boilers with only one burner, prepurge for not less than 30 seconds will be accepted (2) In case of direct ignition, which is a method of ignition that the main burner is fired by ignition spark, opening of the fuel valve is not to precede the ignition spark (3) In case of indirect ignition which is a method of ignition that the main burner is fired by the pilot burner, opening of the fuel valve for the pilot burner (hereinafter referred to as "ignition fuel valve" in this part) is not to precede the ignition spark, and opening of the fuel valve for the main burner (hereinafter referred to as "main fuel valve" in this part) is not to precede opening of the ignition fuel valve (4) Firing is to be surely carried out within the planned period Main fuel valve is to be so designed as to close after opening of the valve not exceeding 10 seconds in the case of direct ignition and 15 seconds in the case of indirect ignition if the firing on the main burner has failed (5) Firing on the main burners is to be carried out at their low firing position (6) After closure of the main fuel valve, post-purge is to be carried out for not less than 20 seconds to ensure adequate combustion air to completely burn all fuel oil remaining between the fuel oil valve and the burner nozzle This requirement need not to be complied with in the case of auxiliary boilers where as deemed appropriate by VR Combustion control devices for the control of the number of firing burners The combustion control devices for the control of the number of firing burners are to comply with the following requirements: (1) Each burner is to be fired and extinguished according to the planned sequence However, the baseburner may be fired by manual operation and other burners may be fired by flame of a burner(s) already fired (2) The remaining fuel in the extinguished burner is to be automatically burnt up in order not to interfere the restarting However, while the pilot burner is not fired, the remaining fuel in the base burner is not to be removed by steam or air when it is in place (3) The burners for main boilers are to be capable of being fired and extinguished from the main control station or the main control station on bridge, except the firing of base burner Other combustion control devices Other combustion control devices are to be deemed appropriate by VR, as well as they are to comply with the relevant requirements in -2 and -3 18.4.3 Automatic feed water control devices 195 tcvn 6259 -3: 2003, Chapter 18 Automatic feed water control devices are to be capable of controlling automatically the feed water in order to maintain the water level in the boilers in a predetermined range Main boilers are to be provided with not less than three water level detectors used for a feed water control device, a remote water level indicator, a low-water level safety device and a low-water level alarm device 18.4.4 Safety measures Safety devices Safety devices are to comply with the requirements in 9.9.10-1 Heating of fuel oil In case where heated fuel oil is used, an automatic temperature control device is to be provided to the heater and the boiler is to be provided with a device to shut off automatically the fuel supply to the burners or an alarm device which operates when the temperature of fuel oil falls below a predetermined value 18.4.5 Alarms Alarm devices are to comply with the requirements in 9.9.10-2 18.5 Automatic and remote control of electric generating sets 18.5.1 General Electric generating sets arranged to be automatically or remotely started are to be provided with interlocking devices necessary for safe operation Electric generating sets arranged to be automatically started are to be so designed that the number of automatic consecutive attempts which fail to produce a start is limited to two times and to be provided with an alarm device which operate at the time of the failure of starting In case where a diesel engine to drive a propulsion generator is remotely started the number of starting is to conform to the required number specified in 2.5.3 Where automatic start of the standby generating set with automatic connection to the switchboard busbars is provided, automatic closure on to the busbars is to be limited to one attempt in the event of the original power failure being caused by short circuit Automatic control and remote control systems for the electric generating set, whose generator is driven by the main propulsion machinery and supplies electrical power to the electrical installations relating to the services specified in 3.1.2(1), Part and is operated while the main propulsion machinery is controlled by the bridge control devices are to comply with the requirements in 3.2.1, Part 4, in addition to those in this 18.5 18.6 Automatic and remote control of auxiliary machinery 18.6.1 Automatic operation of air compressors In case where air compressors for starting and air compressors for controlling are automatically operated, alarm devices are to be provided to indicate pressure drop in air reservoirs 18.6.2 Automatic starting and stopping of bilge pumping arrangements In case where the bilge pumps are capable of being started and stopped automatically, alarm devices are to be provided to indicate high level of bilge in the relevant bilge wells and running of pumps for a long time 18.6.3 Thermal oil installations Thermal oil installations arranged to be automatically controlled are to comply with the followings: (1) Standby pumps 196 Tcvn 6259 -3: 2003, Chapter 18 Pumps listed in the following of the thermal oil installations for important use are to be provided in two sets or more The standby pumps are to be so arranged that they can start automatically or are capable of being started without delay from the relevant monitoring station when discharge pressure or flow rate from the working pump falls below a predetermined value or when the pump stops (a) Thermal oil circulating pumps (b) Fuel oil supply pumps (2) Control devices Control devices are to comply with 18.4.2-1 and -2, also with 9.12.2-1 and -2 (3) Safety devices Safety devices are to comply with 9.12.1 and 9.12.2-5 (4) Alarm devices Thermal oil installations are to be provided with alarm devices, which operate in the following cases: (a) When the safety devices required in (3) have operated (b) When the temperature of fuel at the inlet of burner has failed 18.6.4 High temperature alarm for oil heaters In case where a temperature for fuel oil and lubricating oil is automatically controlled, high temperature alarm devices are to be provided, except where oils are not heated above the flashpoint 18.6.5 Opening and closing devices for sea valves In case where sea valves to be fitted on the shell plating below the load water line are remotely or automatically controlled, their opening and closing devices which can be easily operated even in the event of failure of the automatic or remote control devices are to be provided 18.6.6 Liquid level alarm systems for fuel oil tanks In case where fuel transfer to fuel oil tanks is automatically controlled, the receiving tanks are to be provided with a high and low level alarm 18.6.7 Mooring arrangements In case where mooring arrangements are provided with remote control devices, the mooring arrangements are to be capable of being locally operated 18.6.8 Fuel oil-filling arrangements In case where arrangements for filling fuel oil into respective fuel oil tanks from the outside of the ships (hereinafter referred to as "fuel oil filling arrangements") are provided with remote control devices, the fuel oil filling arrangements are to be such as not to interfere with filling of fuel oil even in the event of failure of the remote control devices 18.7 Tests 18.7.1 Shop tests After constructed, the systems of automatic or remote control of the machinery and equipment, considered necessary by VR, are to be subjected to the following tests (1) Environmental tests Devices, units and sensors (hereinafter referred to as "automatic devices" in this Part) and automatic equipment composed of automatic devices are to be subject to the following environmental tests at the manufacturer's work The procedures of the tests are to be deemed appropriate by VR (a) External examination (b) Operation test and performance test (c) Electrical power supply failure test (to be applied to electrical devices, electronic devices and so on) 197 tcvn 6259 -3: 2003, Chapter 18 (d) Electrical power supply fluctuation test (to be applied to electrical devices, electronic devices and so on) (e) Power supply fluctuation test (to be applied to hydraulic devices, pneumatic devices and so on) (f) Insulation resistance test (to be applied to electrical devices, electronic devices and so on) (g) High voltage test (to be applied to electrical devices, electronic devices and so on) (h) Pressure test (to be applied to hydraulic devices, pneumatic devices and so on) (i) Dry heat test (j) Damp heat test (k) Vibration test (l) Inclination test (m) Cold test (n) Salt mist test (to be applied to devices installed in unenclosed spaces such as open decks) (o) Electrostatic discharge test (to be applied to electronic devices ) (p) Radiated high frequency electromagnetic field test (to be applied to electronic devices) (q) Conducted high frequency interference test (to be applied to electronic devices) (r) Conducted low frequency interference test (to be applied to electronic devices) (s) Electrical fast transient burst test (to be applied to electronic devices) (t) Surge slow transient test (to be applied to electronic devices) (u) Radiated emission test (to be applied to electronic devices which produce electromagnetic emission) (v) Conducted emission test (to be applied to electronic devices which produce electromagnetic emission) (w) Other tests considered necessary by VR (2) Completion tests of automatic equipment The automatic devices which have passed through the environmental tests specified in are to be subjected to the following tests after completion of assembly as automatic equipment The procedures of the tests are to be deemed appropriate by VR (a) External examination (b) Operation tests and performance tests (c) Insulation resistance tests and high voltage tests (to be applied to electric devices, electronic devices and so on) (d) Pressure tests (to be applied to hydraulic devices, pneumatic devices and so on) (e) Other tests deemed necessary by VR 18.7.2 Approval of use Where the automatic devices and automatic equipment have passed the environmental tests specified in 18.7.1, they will obtain the approval of use and made public, upon request from the manufacturer With respect to the automatic devices and automatic equipment which have already obtained the approval of use by VR, a part or all of the environmental test specified in 18.7.1-1(1) may be dispensed with 18.7.3 Tests after installation on board The systems of automatic or remote control of the machinery and equipment are to be, after installed on board, confirmed that they operate effectively, respectively under as far practical condition as possible However, part of these tests may be carried out during sea trials 198 Tcvn 6259 -3: 2003, Chapter 19 Chapter 19 19.1 SPARE PARTS, TOOLS AND INSTRUMENTS General 19.1.1 Scope The requirements in this chapter apply to spare parts, tools and instruments for the machinery installations Term of "machinery installations" used in this chapter is defined as follows: (1) (2) (3) (4) (5) (6) (7) Diesel engines for main propulsion Diesel engines to drive generators or auxiliary machinery essential for main propulsion Steam turbines for main propulsion Steam turbines drive generators or auxiliary machinery essential for main propulsion Main propulsion shafts Boilers Pumps and air compressors Since the requirements for spare parts and tools vary depending on regulations of registered country, purpose of ships engaged, kinds of machinery installations, navigation routes and others, the requirements in this Chapter may not be applicable in all cases However, as a rule, spare parts and tools specified in this Chapter are to be provided in engine room, boiler room or any other convenient places in a ship The spare parts, tools and instruments for machinery installations not specified in this Chapter are to be as deemed appropriate by VR The spare parts and tools for electrical installations are to comply with the requirements in 3.8 in Part The spare parts for ventilating fans for ships carrying liquefied gases or dangerous chemicals in bulk are to comply with the requirement in Chapter 12, Part 8D or Chapter 3, Part 8E respectively 19.1.2 Documentation The ship's owner or shipbuilder is to submit, for approval, the list showing the number of specified spare parts, tools and instruments for machinery installation, actually provided on board 19.2 Spare parts, tools and instruments 19.2.1 Spare parts The spare parts for a diesel engine for main propulsion are given in Table 3/19.1 The spare parts for a diesel engine to drive a generator or an auxiliary machinery essential for main propulsion are given in Table 3/19.2 The spare parts for a steam turbine for main propulsion and a steam turbine to drive a generator or an auxiliary machinery essential for main propulsion are given in Table 3/19.3 The spare parts for a main propulsion shafting are given in Table 3/19.4 The spare parts for a main boiler, an essential auxiliary boiler, a boiler to supply steam for fuel oil heating necessary for operation of main propulsion machinery or cargo heating required continuously, and a thermal oil installation for essential use are given in Table 3/19.5 However, no spare parts are required, provided that stand-by means, which ensure to keep the normal service condition of a ship or heating of cargoes are provided, in case of failure of boilers other than main boiler or thermal oil installations 199 tcvn 6259 -3: 2003, Chapter 19 Table 3/ 19.1 Spare parts for diesel engines for main propulsion Item Spare parts Main bearings Cylinder liner Cylinder cover Cylinder valves Connecting bearings rod Pistons Pistons rings Pistons cooling Main bearings or shells for one bearing of each size and type fitted, complete with shims, bolts and nuts Cylinder liner, complete with joint rings and gaskets Cylinder cover, complete with all valves, joint rings and gaskets For engine without cylinder cover, the respective valves Cylinder cover bolts and nuts, for one cylinder Exhaust valves, complete with casings, seats, springs and other fittings for one cylinder Air inlet valves, complete with casing, seats, springs and other fittings for one cylinder Starting air valve, complete with casing, seat, springs and other fittings Relief valve, complete with casting, springs and other fittings Fuel valves, complete with castings, springs and other fittings for one engine Bottom end bearings or shells of each size and type fitted, complete with shims, bolts and nuts Number required set 1 1/2 set set set 1 set * set Top end bearings or shells of each size and type fitted, complete with shims, bolts and nuts Crosshead type : Piston of each type fitted, complete with piston pins, piston rod, stuffing box, skirt, rings, studs and nuts Trunk piston type : Piston of each type fitted, complete with skirt, rings, studs, nuts, gudgeon pin and connecting rod Piston rings for one cylinder set Telescopic cooling pipes and fittings or equivalent for one cylinder unit set 1 set Chain for camshaft drives Cylinder lubricator Chain drive : Separate links with pins and rollers of each size and type fitted Fuel injection pumps Fuel injection pump complete, or, when replacement at sea is practicable, a complete set of working parts for one pump (plunger, sleeve, valves, springs, etc.) Fuel injection piping High pressure fuel pipe of each size shape fitted, complete with couplings Scavenge blowers (including turbo chargers) Scavenging system Rotors, rotor shafts, bearings, nozzle rings and gear wheels or equivalent working parts if other type (see Note) Reduction and reversing gear Complete bearing bush of each size fitted in the gear case assembly set Roller or ball bearing, complete, of each size fitted in the gear case assembly Special gaskets and packings of each size and type fitted for cylinder cover and cylinder liner for one cylinder set Gaskets and packings Lubricator, complete, of the largest size, with its driving chain or gear wheel Suction and delivery valves for one pump of each type fitted, complete 1 1 set** set - Notes: * Engines with three or more fuel valves per cylinder: two fuel valves complete per cylinder, and other fuel valves excluding casings ** The spare parts for scavenge blowers may be omitted where it has been demonstrated, at the builder's test bench, for one engine of the type concerned, that the engine can be manoeuvred satisfactorily with one blower out of action In this case, however, the requisite blanking and blocking arrangements for running with one blower out of action are to be available on board 200 Tcvn 6259 -3: 2003, Chapter 19 Table 3/ 19.2 Spare parts for diesel engines to drive generators or auxiliary machinery essential for main propulsion Item Spare parts Main bearings Main bearings or shells for one bearing of each size and type fitted, complete with shims, bolts and nuts Cylinder valves Connecting bearings Number required rod Pistons rings Pistons cooling Fuel injection pumps set Exhaust valves, complete with casings, seats, springs and other fittings for one cylinder Air inlet valves, complete with casing, seats, springs and other fittings for one cylinder Starting air valve, complete with casing, seat, springs and other fittings Relief valve, complete with casting, springs and other fittings Fuel valves, complete with castings, springs and other fittings for one engine Bottom end bearings or shells of each size and type fitted, complete with shims, bolts and nuts Top end bearings or shells of each size and type fitted, complete with shims, bolts and nuts Piston rings for one cylinder set Telescopic cooling pipes and fittings or equivalent for one cylinder unit Fuel injection pump complete, or, when replacement at sea is practicable, a complete set of working parts for one pump (plunger, sleeve, valves, springs, etc.) set 1 1/2 set set set set set Fuel injection piping High pressure fuel pipe of each size shape fitted, complete with couplings Gaskets and packings Special gaskets and packings of each size and type fitted for cylinder cover and cylinder liner for one cylinder set Table 3/ 19.3 Spare parts for steam turbines Item Spare parts Main bearing Bearings of each size for rotor shaft and reduction gear shaft Thrust bearing Turbine shaft sealing rings Oil filters Pads (including adjusting lines and rings) for one face Carbon sealing rings, with springs, for each size and type Strainer baskets or inserts for filters of each size and type Applicable to those of special design Number required set for each shaft set * set set Note: * For a main steam turbine, when the pads of one face differ from those of the other, complete set of pads is to be provided 201 tcvn 6259 -3: 2003, Chapter 19 Table 3/19.5 Spare parts for boilers and thermal oil installations Table 3/19.4 Spare parts for main shafts Spare Parts Number required Main thrust bearing: Pads for one face of Michell type thrust block Complet thrust shoe for one face of solid ring type Inner and outer race with rollers of roller thrust bearings set for each size* set for each size* set for each size Note: * When the pads of one face differ from those of the other, complete set of pads is to be provided Number required Spare Parts Safety valve spring of each size including superheater safety valve springs Oil burner nozzles, complete for one boiler Round type water gauge glasses including packings 1 set 12 Flat type water gauge glasses Flat type water gauge frame Table 3/19.6 Spare parts for pumps and air compressors* Item Piston pumps Centrifugal and gear type Pumps** Air Compressors Spare parts Number required Valves with seats and springs of each size fitted Piston rings of each type and size for one piston Bearings of each type and size Rotor seals of each type and size (Parts liable to deteriorate, such as packings, sleeves) Piston rings of each type and size Suction and delivery valves complete of each size set set 1 set 1/2 set Notes: * Pumps and air compressors include those for remote or automatic control system ** Gear type pumps include vane pumps and screw pumps The spare parts for a pump and an air compressor (other than emergency use) which are classified as auxiliary machinery essential for main propulsion, and a bilge pump are given in Table 3/19.6 The spare parts for the machinery installations listed in the Tables 3/19.1 to 3/19.6 are those required for each one set of the machinery installations In case where the ship is installed with two or more sets of the machinery installations of the same type for the same service, only one set of spare parts for the machinery installations may be acceptable However, the number of water gauge glasses of round type and flat type is required to be the number in Table 3/19.5 for each boiler, and the number of flat type water gauge frames is required to be one for each two boilers Notwithstanding the requirement specified in -7, no spare parts are required for the machinery installations specified in following (1) and (2): (1) The machinery installations whose number exceeds the Rule required number and each capacity is adequate under the normal service condition of the ship 202 Tcvn 6259 -3: 2003, Chapter 19 (2) The pumps classified as auxiliary machinery essential for main propulsion, which have stand-by pumps of adequate capacity under normal service condition of the ship 19.2.2 Tools and instruments The tools and instruments for each one ship are given in Table 3/19.7 Table 3/19.7 Tools and instruments Item Spare parts Number required Boiler required spare parts in the requirement in 19.2.1-5 For water tube boiler Tube stoppers or plugs of each size, including those for : 12 for each size superheater tubes and economizer tubes For other type boiler :12 in total* All boilers Standard pressure gauge 1** Water tester set*** Special tools and instruments for maintenance of repair work or the machinery installations set Notes: * In the case of cylindrical boiler, half of them are to be those which can be used from burner side ** Gauge tester will be acceptable *** Two salinometers will be acceptable 203 tcvn 6259 -3: 2003, Chapter 20 Chapter 20 20.1 SPECIAL REQUIREMENTS FOR MACHINERY INSTALLED IN SHIPS WITH RESTRICTED AREA OF SERVICE AND SMALL SHIPS General 20.1.1 Scope The requirements in this Chapter apply to machinery to be installed in ships with a gross tonnage less than 500 tons and intended for registry with restricted areas of service in place of the relevant requirements in Chapters up to the preceding Chapter 19 20.2 Modified requirements 20.2.1 Ships with class notation "Restricted area of navigation II" or equivalent For the following machinery, provisions of spare one may be omitted provided that the total capacity of machinery is sufficient enough to obtain the maximum continuous output of the main propulsion machinery or the maximum evaporative capacity of the main and essential auxiliary boiler, and two sets of machinery in nearly the same capacity and whose capacity of either one set is sufficient enough to obtain navigable speed of the ships, are installed on board ship (1) The source of pressure to drive the clutch of power transmission systems for main propulsion specified in 5.2.4-3 (2) Hydraulic pumps for pitch control gears of controllable pitch propellers specified in 7.2.2-8 (3) Fuel oil supply pumps specified in 13.9.6-1 and -2 (4) Burning systems for boilers specified in 13.9.7-1 and -2 (5) Lubricating oil pumps specified in 13.10.2-1 and -2 (6) Cooling water (oil) pumps for main propulsion machinery specified in 13.12.1-1 and -2 (7) Feed water systems specified in 13.15.1-1 and -2 In the requirements specified in 13.9.6-1(2), 13.10.2-1(2), and 13.12.1-1(3), the requirements to provide a complete set of the spare pump not apply The requirement specified in 15.3.1-4 is not necessary to apply For ships with the Class Notation "Restricted area of navigation II" or equivalent, which are not engaged in international voyages, or whose gross tonnage is less than 500 tons, the following requirements may be complied with in addition to the requirements in -1 and -2 above (1) The requirements specified in 1.3.8 is not necessary to apply (for ships not engaged in international voyages only) (2) The requirements specified in 1.3.9 are not necessary to apply (3) Any other appropriate unit specified in 5.2.4-3 may be replaced with emergency fixing bolts for clutch to enable the ship to have a navigable speed (4) Other suitable device specified in 7.2.2-8 above, may be replaced with a propeller pitch-fixing device to enable the ship to have a navigable speed (5) The requirements specified in 13.6.1-5, 13.9.1-6 and 13.9.1-7 are not necessary to apply (6) The requirements specified in 15.1.5 are not necessary to apply (7) The requirements specified in 15.2.4-5 and the requirement for steering gears specified in the latter part of 15.2.4-6 above is not necessary to apply (excluding the case where the provision of auxiliary steering gear is omitted according to the requirements in 15.2.1-2 above) (8) The requirements for an alternative source of power specified in 15.2.6 above is not necessary to apply (9) The requirements in 15.2.7-1 and -7 above are not necessary to apply (10) The requirements for overload for circuits and motors specified in 15.2.7-5 above is not necessary to apply 204 Tcvn 6259 -3: 2003, Chapter 20 (11) A means of communication between the navigating bridge and the steering gear compartment specified in 15.2.9 above may be replaced with an appropriate alternative means (12) The requirements in 15.3.1-3 above is not necessary to apply 20.2.2 Ships with the class notation "Restricted area of navigation III" or equivalent The buffer arrangements specified in 15.4.9 may be omitted, in addition to complying with the requirements specified in 20.2.1-1, -2 and -3 above For ships with a diameter of the upper stock according to 25.1, Part 2A not more than 120 mm (calculated with a material factor Ks = where is less than 1), the provisions of the auxiliary steering gear specified in 15.2.1 above may be omitted where spare parts for consumables, such as packing and bearings, are provided for the power-driven main steering gear or where spare steering wires are provided for the hand-powered main steering gear For ships with the class notation "Restricted area of navigation III" or equivalent which are not engaged in international voyages, or whose gross tonnage is less than 500 tons, the following requirements may apply in addition to the requirements specified in 20.2.1-1 to -4, 20.2.2-1 and -2 (1) Notwithstanding the requirements in 1.3.1-4 above, provisions of one unit or one set each of the machinery specified in 20.2.1-1(1) to (7) may be accepted, provided that each has such a capacity sufficient for the main propulsion machinery to obtain the maximum continuous output and for the main and essential auxiliary boiler to obtain the maximum evaporative capacity (2) The requirements for fuel oil transfer pumps specified in 13.9.4 may be modified to one set of a pump driven by an independent source of power (3) Notwithstanding the requirement in 1.3.1-4, the requirements for two or more starting air compressors specified in 13.13.3 may be modified to one starting air compressor driven by an independent source of power 20.2.3 Ships with a gross tonnage less than 500 tons For ships with a gross tonnage less than 500 tons, the requirements specified in 20.2.1-3 and -4(2) and (5) to (12) above may be complied with Moreover, the buffer arrangements specified in 15.4.9 above may be omitted For ships which are not engaged on international voyages or whose gross tonnage is less than 500 tons, the requirement specified in 13.4.1-4 need not to apply The requirements specified in the latter of 2.5.4-2 may not apply to diesel engines having an maximum continuous output of less than 375 kW, and installed in the space other than machinery spaces of category A of the ship not engaged in international voyages or with a gross tonnage less than 500 tons, provided if a suitable enclosure for the fuel injection piping system on such a engine is fitted 20.3 Spare parts, tools and instruments for ships with restricted areas of service 20.3.1 Spare parts, tools and instruments and etc for ships with class notation "Restricted area of navigation II" Spare parts, tools and instruments for the machinery installed in ships with a class notation of "Restricted area of navigation II" may be in compliance with the requirements specified in Table 3/20.1 However, for ships equipped with two or more diesel engines or steam turbines for main propulsion and for ships equipped with or more main generators, spare parts for diesel engines or steam turbines for main propulsion or to drive main generators are not to be required 20.3.2 Spare parts, tools and instruments for ships with class notation "Restricted area of navigation III" 205 tcvn 6259 -3: 2003, Chapter 20 Spare parts, tools and instruments for the machinery installed in ships with a class notation of "Restricted area of navigation III" may be in compliance with the requirements specified in Table 3/20.2 However, for ships equipped with two or more diesel engines or steam turbines for main propulsion and for ships equipped with two or more main generators, spare parts for diesel or steam turbines for main propulsion or to drive main generators are not to be required 206 Tcvn 6259 -3: 2003, Chapter 20 Table 3/20.1 Spare parts for ships of restricted area of navigation II Area of service Table No in Chapter 19 Table 3/19.1 Restricted Items and types of spares Cylinder liner, cylinder cover, piston, camshaft driving gear, cylinder lubricator, scavenging air blower(including turbocharger) scavenging air system, reduction gear, reversing gear Number required Omitted Main bearing, piston cooling system area of Table navigation II 3/19.2 Cylinder mounted valve Starting air valve, relief valve Exhaust gas valve, fuel injector Connecting rod bearing Table 3/19.3 & Table 3/19.4 For one cylinder Lower half of small end bearing, upper half of big end bearing, one piece each All items and all types Omitted Cylindrical water gauge glass 06 pieces Flat water gauge glass 01 piece Table 3/19.5 Table 3/19.6 Centrifugal pump, gear pump, air compressor Omitted Standard pressure gauge Table 3/19.7 Water tube boiler 04 piece each Other types of boiler 04 pieces in total Tube plug 207 tcvn 6259 -3: 2003, Chapter 20 Table 3/20.2 Spare parts for ships of restricted area of navigation III Area of service Table No in Chapter 19 Table 3/19.1 & Table 3/19.2 Items and types of spares Connecting rod bearing Number required Lower half of small end bearing, upper half of big end bearing, one piece each All items excluding Connecting rod bearing Table 3/19.3 & Table 3/19.4 Restricted area of navigation III All items and all types Omitted Safety valve spring, complete set of oil burner Table 3/19.6 Cylindrical water gauge glass 03 pieces Flat water gauge glass Table 3/19.5 01 piece Centrifugal pump, gear pump, air compressor Omitted Standard pressure gauge Table 3/19.7 Water tube boiler 02 piece for each Other types of boiler 02 pieces in total Tube plug 208 .. .tcvn 6259 -3 : 2003, Chừỗng (2) My phũ dïng ½Ì ½iËu ½ỉng v¡ an to¡n MŸy phị dïng v¡o mịc ½Ïch ½iËu ½ỉng t¡u an to¡n v¡ mŸy phũ dùng ẵè ẵăm băo an toĂn cho tĂu vĂ sinh m−ng ngõéi trÅn t¡u. .. trịc qui ½Ùnh ê 2.2.4 kháng ½õìc nhị hỗn gi tr tẽnh theo cỏng thửc sau : d b = 0,75 (0,95d c ) nD × 440 Tb 19 tcvn 6259 -3 : 2003, Chừỗng Trong ½Ü : db : ‡õéng kÏnh bu láng nâi trịc (mm) n : Sâ... Ph·n n¡y v¡ 4.2.2, Ph·n cða Qui phm nĂy 22 tcvn 6259 -3 : 2003, Chừỗng NgoĂi viẻc phăi p dũng 4.2.2(5)(b), PhÃn cða Qui ph−m n¡y, ½õéng âng phun d·u ½ât cao p phăi tuàn theo cc yu cÃu sau: (1) Nặu