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

RISK-BASED INSPECTION METHODOLOGY, PART 3—CONSEQUENCE OF FAILURE METHODOLOGY 3-41
CA is the consequence area for an instantaneous release, m 2 (ft 2 )
INST
f , n
CA leak
inj,
n is the personnel injury nonflammable, nontoxic consequence area for steam or acid leaks,
associated with the n th release hole size, m 2 (ft 2 )
CA
f , max is the final maximum consequence area, m 2 (ft 2 )
CA is the component damage nonflammable, nontoxic consequence area, m 2 (ft 2 )
nfnt
f , cmd
CA is the final probability weighted personnel injury consequence area for nonflammable, nontoxic
nfnt
f , inj
nfnt
inj,
n
releases such as steam or acids, m 2 (ft 2 )
CA is the personnel injury nonflammable, nontoxic consequence area, associated with the n th
stm
inj,
n
release hole size, m 2 (ft 2 )
CA is the personnel injury consequence area for steam leaks, associated with the n th release hole
tox
f , cmd
size, m 2 (ft 2 )
CA is the final probability weighted component damage toxic consequence area, m 2 (ft 2 )
CA is the final probability weighted personnel injury toxic consequence area, m 2 (ft 2 )
tox
f , inj
CA −
tox CONT
inj,
n
is the personnel injury toxic consequence area for a continuous release, associated with the n th
release hole size, m 2 (ft 2 )
CA is the personnel injury toxic consequence area for an instantaneous release, associated with
tox _ INST
inj,
n
the n th release hole size, m 2 (ft 2 )
costfactor is the cost factor reflecting the change in carbon steel and replacement costs from 2001
d
d
n
e
eneff
n
envcost
Is a gas release constant used in HF and H2S releases for the Level 1 toxic consequence area
analysis
is the diameter of the n th release hole size, mm (in.)
Is a gas release constant used in NH3 and Cl releases for the Level 1 toxic consequence area
analysis
is the energy efficiency correction factor for instantaneous events exceeding a release mass of
4,536 kg (10,000 lb)
is the environmental cleanup costs, $/bbl
equipcost is the process unit replacement costs for component, $/m 2 ($/ft 2 )