Natural Gas Processing

V

Vacuum piping, 108

Vacuum safety valves, 317

material selection for, 354–356

dimensions and, 355–356

orifice area determination for, 356, 356t

by type, 355

sizing criteria for, 338

SP for, 328

Vacuum test, 824

Vacuum tower overhead line, 71

Valve flow coefficient (C_v), 371

gas calculations of, 400–409, 401t–402t, 404f–405f

pressure drop ratios and, 401–402, 401t

sizing examples for, 406–409

liquid calculations of, 388–396, 389f–390f, 390t

critical pressures and, 391, 391t, 392f

flashing velocity, 399–400

piping geometry factors and, 393, 394t

sizing examples for, 396–400

valve outlet areas and, 395, 395t

for two-phase flow, 409–411, 412t

Valve outlet areas, 395, 395t

Valves, 109–112, 371

See also specific valves

closed spring type, 323

elevated, 110

fire relief, 319 ...