API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

RISK-BASED INSPECTION METHODOLOGY, PART 3—CONSEQUENCE OF FAILURE METHODOLOGY 3-121
W
n
is the theoretical release rate associated with the n th release hole size, kg/s (lb/s)
pool
W
n
is the portion of the release rate that forms a pool on the ground associated with the n th release
hole size, kg/s (lb/s)
W
TNT
is the energy released in an explosion expressed as an equivalent mass of TNT, kg (lb)
bleve
xs
cmd
is the safe distance from a BLEVE for component damage associated with the rupture case,
m (ft)
bleve
xs is the safe distance from a BLEVE for personnel injury associated with the rupture case, m (ft)
inj
fball
xs is the safe distance from the flame surface of a fireball, m (ft)
fball
xs
cmd
is the safe distance from a fireball for component damage associated with the rupture case,
m (ft)
fball
xs is the safe distance from a fireball for personnel injury associated with the rupture case, m (ft)
inj
xs is the safe distance from the jet fire flame surface for component damage associated with the
jet
cmd , n
n th release hole size, m (ft)
xs is the safe distance from the jet fire flame surface for personnel injury associated with the n th
jet
inj,
n
release hole size, m (ft)
jet
xs
n
is the safe distance from the jet fire flame surface associated with the n th release hole size, m (ft)
xs
n
is the safe distance from the flame surface to the target location associated with the n th release
hole size, m (ft)
pexp
xs is the safe distance from a physical explosion for component damage associated with the
cmd
rupture case, m (ft)
pexp
xs is the safe distance from a physical explosion for personnel injury associated with the rupture
inj
case, m (ft)
xs is the safe distance from the pool fire flame surface for component damage associated with the
pool
cmd , n
n th release hole size, m (ft)
xs is the safe distance from the pool fire flame surface for personnel injury associated with the n th
pool
inj,
n
release hole size, m (ft)
pool
xs is the safe distance from the pool fire flame surface associated with the n th release hole size, m (ft)
n
xs is the safe distance from the VCE for component damage associated with the n th release hole
vce
cmd , n
size, m (ft)