( Test Fluid ( Valve inspection and testing

5.6 Test Fluid 

5.6.1 For shell, high-pressure backseat, and high-pressure closure tests, the test fluid shall be air, inert gas, kerosene, water, or a noncorrosive liquid with a viscosity not higher than that of water. Unless otherwise specified in the purchase order, the test fluid temperature shall be within the range 5 C (41  F) to 38  C (100  F).

5.6.2 For the low-pressure closure and low-pressure backseat tests, the test fluid shall be air or inert gas. 

5.6.3 When air or gas is used for closure, shell, or backseat tests, the valve manufacturer shall be capable of  demonstrating the adequacy of the method of leakage detection. 

5.6.4 Water used for any test can contain water-soluble oil and/or corrosion inhibitor. When specified by the  purchaser, a wetting agent shall be included in the water. For testing of austenitic stainless steel valves, water  with chloride content not exceeding 50 ppm shall be used. The valve manufacturer shall be able to document the  chloride content.