The followings are the tips for installing safety valves.
(1) Safety valves should be installed erectly and close to protected equipments or piping. If the valves cannot be close, overall pressure drop on the distance from protected equipments or piping to inlet of safety valves should exceed 3% of constant pressure value of safety valves.
(2) Safety valves should be equipped with maintenance platform. For safety valves having high weight, it is necessary to set a suspender when consider the possibility that lifts the valves after being disassembled.
(3) Inlet piping of safety valves should adopt long radius bends.
(4) When design outlet piping of safety valves, backpressure should be considered not to exceed certain value of safety valves constant pressure. For common spring safety valves, the back pressure cannot surpass 10% of safety valves constant pressure value.
(5) When media inside escape piping contain condensates or condensable gas, the outlet of safety valves should be higher than escape piping. Otherwise, draining measures must be taken.
(6) Outlet piping of safety valves in immission closed system should be obliquely connected to the top of discharge piping at an angle of 45°, along with media flow direction, in case of condensates inside piping back flowing into branch piping, and reducing backpressure of safety valves.
(7) When inlet and outlet piping of safety valves require stop valve, single disc gate valve should be chosen and sealed by lead. Stem must be installed horizontally to prevent disc from gliding, when pins connecting stem and disc loosen or be corroded. When safety valves are equipped with by-pass valves, the valves also should be sealed by lead.
May 14,2015
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