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What is PSV ?

A pressure safety valve (PSV) is a failsafe used to guard against process over pressure and safeguard people, property, and processes. When the system pressure exceeds the predetermined pressure, they are designed to immediately open to release pressure. Once normal circumstances have been restored, they are then designed to close once more to stop the discharge of any additional fluid or gas. Particularly in the oil & gas, power generation, water/wastewater, aerospace/aviation, steel manufacturing, chemical, and plastics industries, PSVs are crucial for the safety of people and equipment. They are the last line of defense against catastrophic failure in systems under overpressure circumstances since they are entirely mechanical and capable of operating at all times.

Requirements of PSV

To ensure that the anticipated operation will be successful when necessary, the PSV placed at the operational plant must undergo frequent testing in accordance with the inspection plan or manufacturer’s instructions. Every PSV is typically examined once every one to three years to make sure the mechanical components are still in good condition and haven’t been corroded or worn down.

It is crucial since it is one of the key elements that enables pipeline systems in the industry to operate at the regularly prescribed pressures. Since fault detection is an essential component, testing is necessary to maintaining the system state at the desired level.

Procedure of PSV

PSV testing is often referred to as the popping test or the cracking test. For the test, the following are essential components:

  • An external pressure source
  • The PSV under test
  • A reference pressure gauge

Following are the steps for process –

STEP 1 – Verify the riveted tag’s engraving of the PSV set pressure. The PSV ought to activate when the system pressure hits this level, according to theory.

STEP 2 – To measure the pressure, install a pressure gauge that has been certified and calibrated. Make sure the gauge has enough range to monitor that pressure at all times.

STEP 3 – Continue to raise the PSV’s inlet side pressure from an external source of pressure until the PSV abruptly pops up. The pressure gauge’s current reading should be noted.

STEP 4 – Once the PSV shuts, note the pressure as you gradually reduce the pressure (Reseat in position).

STEP 5 – At least three times should pass through the PSV testing process, and each time the pressures should be recorded for verification.

STEP 6 – For certification and approval, send the readings to the certifying authority.

Standards of PSV

  • API RP 576
  • ASME PTC 25
  • API 581
  • NZA 3788
  • API RP 527
  • BS EN ISO 4126-1, 4126-2, and 4126-3
  • API RP 521
  • API 520

Thus, When managing pipeline systems efficiently, safety comes first. PSV Testing ought to be taken into account as a component of routine maintenance in order to follow quality controls and safety compliances. In addition to its many advantages, it guarantees the best operation of safety controls to reduce the possibility of hazards like explosions or pipeline failures. Testing also aids in controlling pipeline integrity and extending its service life in a number of other ways.

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