This article highlights key areas to look for in the design when a PSV is directly routed to the atmosphere. Relieving PSVs directly to the atmosphere, however, requires special safety attention and considerations. The setup required to connect the relief sources to a flare system could be too expensive or complex for remote gathering systems and hence the PSVs might be directed to the atmosphere in such cases. ![]() Alternatively, the PSV discharge can be directly sent to the atmosphere on some occasions. ![]() More commonly, the PSV discharge is sent to a flare via a flare header which collects several relief sources through a flare network of headers and sub-headers. Pressure safety valves (PSV) are used extensively in oil and gas applications to protect vessels, pipes, and other equipment against overpressure.
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