ISO 5208:2008 pdf free.Industrial valves — Pressure testing of metallic valves.
Introduction of ISO 5208:
The purpose of this International Standard is the establishment of basic requirements and practices for pressure testing valves of various configurations that are used in general purpose, power generation, petroleum, and petrochemical or allied industry applications. The intent is to provide a consistent set of procedural requirements and acceptance criteria that can be considered in conjunction with valve specific standards appropriate for specific applications. Account has been taken of the valve testing requirement needs of EN 12266 and API 598 with requirements referenced for PN designated valves for the former and Class designated valves for the latter.
ISO 5208:2008 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 5208:2008 is 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.
3 Conditions relevant to pressure testing
3.1 Purchaser examination options
3.1.1 A purchaser may specify, in a valve procurement purchase order, examination and pressure testing requirements along with the opportunity to be witness to specific in-process examinations and tests as regards valves that are the subject of the purchase order. In this event, a representative of the purchaser shall be allowed access to those areas of the manufacturer’s site that are involved with related examination and pressure testing of the purchase order valves.
3.1.2 When a purchaser specifies examinations or testing to be witnessed as described in 3.1.1, the valve manufacturer shall give notice to the purchaser at least five working days prior to the purchase order specified activity.
3.2 Witnessing
If pressure testing in the presence of a representative of the purchaser is specified for valves that are in stock, painted or coated valves from stock may be retested without removal of painting or coating.ISO 5208:2008 pdf free download.