ISO 5208: Industrial valves — Pressure testing of metallic valves

ISO 5208 Standard specifies examinations and tests that a valve manufacturer needs to act upon in order to establish the integrity of the pressure boundary of an industrial metallic valve and to verify the degree of valve closure tightness and the structural adequacy of its closure mechanism.

ISO 5208 Standard is intended to be applied in conjunction with the specific requirements of a valve product standard to the extent cited by the product standard as a normative reference.

Where requirements of a product standard differ from those given in this International Standard, the requirements of the product standard apply.

ISO 5208 Standard is not applicable to the safety aspects of pressure testing.

Table 4 —Maximum allowable closure test leakage rate

NOTE 1 The leakage rates only apply when discharging test fluid to the atmosphere

NOTE 2 The closure leakage rate that applies is either that identified in a valve product standard or a leakage rate identified in a purchaser's valve procurement purchase order that is more stringent than that specified in the product standard.

NOTE 3 For the definition of visually detectable leakage see 2.12.

NOTE4 There is a correspondence between the leakage rate acceptance values of API 598 and the leakage values Rate A as applied to DN≤50,Rate AA-Gas and Rate CC-Liquid for other than metal seated check valves and for check valves Rate EE-Gas and Rate G-Liquid.Rates A,B,C,D E,F and G correspond to values in EN 12266-1.