API 2521 : 1966
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
USE OF PRESSURE-VACUUM VENT VALVES FOR ATMOSPHERIC LOSS
Hardcopy , PDF
13-05-2013
English
01-09-1966
Introduction
Sources of evaporation loss
Breathing loss
Filling loss
Emptying loss
Types and operating characteristics of vents
Solid and diaphragm pallet valves
Liquid seal valves
Pilot-operated vents
Emergency vents
Air baffles
Location of PV vents
Vent settings
Testing of vents
Maintenance procedures
Freezing conditions
Summary
Appendix I - Leakage test equipment for PV vent valve
Appendix II - Committee membership
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