Page 270 - Valve Selection Handbook
P. 270
Sizing Pressure Relief Devices 257
Figure 7-1. Typical Pressure Relief Valve Installation. Subscripts Used in Flow
Equation for Conditions at Indicated Points.
Table 7-1.
Nomenclature
Mixed SI Mixed US
Units Units
2
A Flow area mm in/
C Gas flow constant for sonic
nozzle flow, based on isentropic
coefficient k at standard conditions
(See Table 7-2. If k is unknown, use
C=315 for a conservative result)
d Internal pipe diameter mm in.
table continued on next page
