Valve testing in pipeline installation

Valves are inspected first and then installed.

Valve testing is carried out before installation, and installation proceeds only after passing the test.

If you want to conduct a pressure test, it’s not impossible to do so: place pads on both sides of the valve, build a frame, and use a jack to apply pressure for the test

Valve testing is specified in several standards for \"industrial pipelines\", but pressure tests are generally not carried out in practice. Please leave your comments

There’s no such thing as a separate test; it’s just done by pressurizing the pipeline directly, thus completing the test in one go

If the valve manufacturer has provided proof of a pressure test prior to shipment, it can be installed directly and subjected to a pressure test along with the pipes.

Welded valves can only be pressure-tested after they have been installed and integrated with the piping system

The project specifications for foreign clients require that pressure tests be conducted on the valves before they are transported to the site and installed in the pipelines, in order to prevent damage that may occur during transportation.

Valves are usually installed only after passing tests such as pressure testing

Valves shall be inspected before installation; the inspection items, quantities, and methods are clearly specified in 4.0.3 and 4.0.4 of the \"GB 50184-2011 Code for Acceptance of Construction Quality of Industrial Metal Piping Projects\". The testing of valves should be carried out using a dedicated test bench. For your reference, 4.0.3 Valves shall undergo shell pressure tests and sealing tests; valves with an upper sealing structure shall also undergo an upper sealing test, and they must comply with the following requirements: 1 Valve tests shall be conducted using clean water as the testing medium. When testing stainless steel valves, the chloride ion content in water must not exceed 25×10‑6 (25 ppm). Once the test is passed, the water stains should be removed immediately. When there are special requirements, the test medium shall comply with the provisions of the design documents. 2 The test pressure for the valve housing shall be 1.5 times the maximum allowable operating pressure of the valve at 20°C ； The sealing test pressure shall be 1.1 times the maximum allowable operating pressure of the valve at 20°C ； When the valve nameplate indicates that a high-pressure sealing test is not suitable for the maximum operating pressure difference or the actuator supplied with the valve, the test pressure shall be 1.1 times the maximum operating pressure difference indicated on the valve nameplate ； The upper sealing test pressure for the valve should be 1.1 times the valve’s maximum allowable operating pressure at 20°C ； The test pressure for the jacket portion of a jacketed valve should be 1.5 times the design pressure. 3 The duration under test pressure shall not be less than 5 min. 4 The pressure test of the valve housing shall be considered successful if there is no leakage from the housing gasket. The valve sealing test and the upper sealing test are considered successful if there is no leakage at the sealing surfaces. 5 Number of inspections: It shall comply with the following provisions: 1) Valves used in GC1-class pipelines and pipelines for Class C fluids with a design pressure of 10 MPa or higher shall be subject to 100% inspection. 2) For valves used in GC2 class pipelines and all Class C fluid pipelines with a design pressure of less than 10 MPa, 10% of each inspection lot shall be sampled, with a minimum of 1 valve per lot. 3) For valves used in GC3 class pipelines and Class D fluid pipelines, 5% of each inspection lot shall be sampled randomly, with a minimum of 1 valve. 6 Inspection methods: Visual inspection, examination of valve test records, and review of water quality analysis reports.