Page 278 - Valve Selection Handbook

Sizing Pressure Relief Devices 265

Figure 7-4. Correction Factor for High Pressure Saturated Steam, K N. (Courtesy of
Crosby Engineering Handbook, Technical Document No. TP-V300, September 1995,
Crosby Valve & Gage Company, Wrentham, MA.)

Customary Mixed SI Units

K N = 1.00 where P l < 105 bara

2 764P —1000
= — I where P, > 105 bara and up to 221.7 bara
K N N l
3.323P,-1061

K SH = superheat correction factor Table 7-3.
Values of correction factor for high pressure saturated steam, K N, may
be obtained from Figure 7-4.