Roshan
in relation with consequence modeling and IRPA Qalculation, it seams that the need to extend the space between your equipments is to increase the air movement rate in your plant. it may reduce the toxic concentration in the air and reduce the radius of fatality distance. If this is the case none of inspection and maintenance can do this. Inspection of your pressurized equipment may reduce the leak frequency of your process equipment. but you have to demonstrate it with the Quantitative Risk Based Inspection. maintenance of your shutdown system (Functional Testing) may reduce the PFD of your shutdown system but you have demonstrate it with SIL verification study.