Pressure Relief Valve (PRV) Testing

Pressure Release Valve Inspections and Testing

Pressure Relief Valve (PRV) Testing

Pressure relief devices such as a safety valve or pressure relief valves prevent a system from becoming over pressurized. Their proper function is essential, pressure relief devices must be inspected according to OEM recommendations, the inspection should verify that:

  • The device is appropriate for current use.
  • The set pressure is correct.
  • The installation is correct and the device functions while system is in operation.
  • Defective device(s) must be replaced immediately.

Because safety is of the highest priority when dealing with pressure relief valves. The valve is designed to limit system pressure, and it is critical that they remain in working order to prevent incidents or accidents.

Periodic testing and adjustment of pressure relief valves is essential to maintain overall safety whether in Oil & Gas, Power Generation, Refineries, Chemical/Plastics, Steel Manufacturing, and many other industries. The most common test method for safety valves and relief valves is a bench test, performed in a controlled environment. Such tests typically occur in conjunction with the disassembly, inspection and repair or replacement of the PRV.

Global 1 offshore and onshore testing and calibration services for Pressure Relief Valves (PRV) are inspected and tested in accordance with international codes and in compliance with manufacturers recommended practices.

Before testing proceeds, we will dispatch a customised offshore certified testing workshop to support and facilitate the inspection, testing, certification and calibration of PRV’s.

Global 1’s testing workshop are custom built from 10 x 8 Containers which are constructed to the highest standards to enable a professional, efficient and safe controlled environment; this in turn means that Global 1 inspection personnel are independent from Rig Workshops / Resources and Equipment. 

This enables our testing technicians to carry out a professional and efficient testing service in a safe environment while also in a controlled laboratory environment.

All our Technicians are qualified, experienced employees of Global 1, and are experienced and up to date with the latest API and ASME Standards and recommendations.


The following specifications and Codes of Practice shall be taken into consideration for the work carried out, equipment used, and acceptance criteria:

 ASTM D5720 – Standard practice for static calibration of electronic transducer based pressure measurement systems for geotechnical purposes

  • API RP 576 – Inspection of pressure relieving devices
  • ASME PTC 25 – Pressure relief devices

 All operational activities carried out and performed by Global 1 are controlled by the Health, Safety, Environment and Quality (HSEQ) of the Company, which is in accordance with, and accredited to, ISO 9001, ISO 45001 & ISO 14001. Copies of our relevant Certification / Accreditations can be issued for information.

Pressure Release Valve Images
  • On Site Pressure Relief Valve Testing Container
    On Site Pressure Relief Valve Testing Container

Frequently asked questions

“Pop Test” is a set pressure test of Pressure Relief Valve (PRV) by compressing the pressure into the inlet of PRV until Valve opens. The pressure that causes Valve to open (Pressure) will be compared with the Set pressure of the PRV to see how Valve open pressure on the set or not.

Yes. Pressure relief valves can be reset and VR stamped with full inspection by an authorised valve repair company. Some repairs may be necessary before the valve can be reset. For example, the valve may need a spring change.

Pressure relief valve leaks usually occur when the valve isn’t properly seated or when the seal is broken or damaged. Leaks can also happen when the pressure relief valve is operating too closely to the set point.

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