All valves built to the various api standards are required to meet api 598 leakage criteria prior to shipment from the.
Api gate valve testing procedure.
The strength test of gate valve is the same as that of sanitary shut off valve.
Then close the gate plate and immediately remove the gate valve to check whether there s leakage at the.
The third party inspection for valve article provides you with a sample valve inspection and valve testing procedure in the manufacturing shop.
The steel valves are designed and built in accordance with american petroleum institute api 600 and tested per the applicable sections of api 598.
It is particularly suitable for the inspection of gate globe ball and check valves.
The sequence of tests to be performed and have provided a more detailed procedure for each test.
The valve shell test or body test is conducted based on the valve manufacturer approved test procedure.
Valve inspection and testing covers the testing and inspection requirements for gate globe check ball plug and butterfly valves.
To metal seated valves of the following type gate.
The valve is adjusted until the ball disc is in a half open position.
The valve is filled with dry clean and oil free nitrogen or air through the.
Open the gate plate so that the pressure inside the valve rises to the specified value.
There are two types of sealing performance test for gate valve.
The valve inlet and outlet are closed off with flanges.
This content is general and can be useful even if the design code is different from the api code.
The api standard 598.
Valve inspection and testing 1 general 1 1 scope 1 1 1 this standard covers inspection examination supple mentary examinations and pressure test requirements for resilient seated nonmetallic seated e g ceramic and metal to metal seated valves of the gate globe plug ball check and butterfly types.
This test is optional depending on size class type but on api 608 valves and api 600 gate valves it is always performed by gsl.
In both cases seat leakage tests are performed on factory new valves with the stem vertical and the maximum handwheel torque applied with measurable leakage allowed at the test pressures involved.
The most valve manufacturers standard procedures are driven by the requirements of api 598 valve inspection and testing and asme b16 34 valves flanged threaded and welding end the valve is mounted on the test bench and shall be.
It has acceptable leakage rates for liquid as well as gas testing.
