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

RISK-BASED INSPECTION METHODOLOGY, PART 3—CONSEQUENCE OF FAILURE METHODOLOGY 3-45
W
max8 is the maximum flow rate of additional mass that can be added to the release as contributed
from the surrounding equipment in the inventory group, kg/s (lb/s)
W
n
is the gas or liquid release rate associated with the n th release hole size, kg/s (lb/s)
x
i
is the mole fraction of the component and i
individual components in the fluid mixture
ρ is the density, kg/m 3 (lb/ft 3 )
Property may be the NBP, MW, or density of the
ρ
atm is the atmospheric air density, kg/m 3 (lb/ft 3 )
ρ
l
is the liquid density at storage or normal operating conditions, kg/m 3 (lb/ft 3 )
ρ
v is the vapor density, kg/m 3 (lb/ft 3 )