How To Conduct Safety Valve Testing

 Safety Valve Testing: The smooth and safe operation of any industrial process depends on valves that function with precision. Valve testing makes sure that the valves are good enough to meet design standards and specifications within their operational life. Valve testing makes sure that they are fit for service. However, testing is also performed at regular intervals post-installation as a part of the standard practice. The valves are also tested for EMC compliance.

Today we will have a look at commonly used types of valve testing and guidelines for valve testing. There are different types of testing for the valve and the best testing safety valves is determined on the basis of application, manufacturer standards, as well as specifications mentioned by the customers.

Here’s a look at some common Safety Valve testing procedures:

General Pressure Testing

In this type of testing the valve is filled with a liquid. Usually, it is water with a corrosion inhibitor. Pressure is applied for a specific period of time wherein the level of pressure and duration varies based on valve material, category of pressure test, and size of the valve. The pressure is more than the usual working pressure of the valve. It aims to examine the integrity of the valve shell, seal, and seat against leakages because of pressure.

Hydrostatic vs Pneumatic Pressure Testing

Though water is one of the most common mediums for valve testing, some conditions require pneumatic pressure testing of the valves. In this type of testing, air/ inert gas like nitrogen is used. Hydrostatic testing is suitable for applications where equipment is not sensitive to moisture. Pneumatic testing is advised where moisture can damage some equipment due to corrosion.

As per industry guidelines, pneumatic testing is recommended for low-temperature or cryogenic valves.

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