You must log in to edit PetroWiki. Help with editing
Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. SPE disclaims any and all liability for your use of such content. More information
Message: PetroWiki content is moving to OnePetro! Please note that all projects need to be complete by November 1, 2024, to ensure a smooth transition. Online editing will be turned off on this date.
Glossary:Pressure relief valve (PRV)
A mechanical valve that opens at a preset pressure to relive pressure in a vessel.
Also
A safety device designed to release gas in the event of an unacceptable pressure being detected within the system it protects.
(Note - Safety relief device is the same)
A pressure relief valve (PRV) is a safety mechanism used to help regulate the pressure in a system. Pressure relief valves are a leading cause of emissions from hydrocarbon storage tanks. As the pressure in these tanks rises, the valve may open, releasing pressure, and in turn, releasing natural gas into the
atmosphere. In this sense, PRVs are a source of venting.
Thief Hatch - The purpose of the thief hatch is to work in tandem with the vent valve to minimize the escape of light ends of crude in lease storage tanks by maintaining a pressure on the tank. a vacuum relief function is also standard. the thief hatch permits access to the contents of the tank for sampling and gauging. The vent valve should be set to vent pressure before the thief hatch.[1] [2]