... on: • • the height of the roof; a hard or soft landing © Woodhead Publishing Limited, 2010 122 The risk management of safety and dependability The probability of a fall will depend on the: • • ... the risk of an explosion is unacceptably due to the high risk ranking of The risk is reduced by the addition of an automatic pressure control to the system This, however, cannot improve the risk ... system fails, then the system depends on the reliability of the pressure safety relief valve on the vessel The safety of the manual control system can also be examined by the use of FMECA (Table...