ISO 5208-2015 pdf free.Industrial valves一Pressure testing of metallic valves.
ISO 5208 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. This International 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.
This International Standard is not applicable to the safety aspects of pressure testing.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1 shell test
test at a pressure in excess of the cold working pressure (2.9) rating of a valve for the purpose of validating the soundness and strength of the valve pressure containing and retaining structures
Note I to entry: These structures include valve-actuating mechanisms that have a direct connection to the valve internals subject to fluid test pressure within the valve proper.
2.2 closure test
pressure test for the purpose of validating leakage through a valve’s closure mechanism
2.3 test pressure
internal pressure (gauge), expressed in bar to which the valve under test is subjected
Note 1 to entry: Unless otherwise noted, gauge pressure is used throughout this International Standard. Note 2 to entry: 1 bar = 105 Pa.
2.4 test fluid
pressurized liquid or gas used to test a valve
2.5 test fluid temperature
temperature of the test fluid,> 5 °C and < 40 °C
2.6 resilient seats
broad category of seating surface materials that make up a pliable seat sealing combination, including elastomeric, polymeric, solid and semi-solid grease seals, either used in combination or used in conjunction with a mating metallic or ceramic component
2.7 DNorNPS
alphanumeric designation of size that is common for components used in a piping system, used for reference purposes, comprising the letters DN or NPS followed by a dimensionless number indirectly related to the physical size of the bore or outside diameter of the end connections
Note I to entry: The number following DN or NPS does not represent a measurable value and is not used for calculation purposes except where specified in a product standard.
2.8 PN or Class
alphanumeric designation for pressure-temperature rating that is common for components used in a piping system, used for reference purposes, comprising the letters ‘PN or Class’ followed by a dimensionless number indirectly related to the pressure retaining capability as a function of temperature of the component
Note 1 to entry: The number following PN or Class does not represent a measurable value and is not used for calculation purposes except where specified in a product standard. There is no definitive correlation that links PN designations to Class designations.
2.9 cold working pressure CWP
maximum fluid pressure assigned to a valve for operation at a fluid temperature of—20 °C to 38°C
Note I to entry: Valve pressure-temperature ratings are specified in product standards by reference to PN or Class designations.
2.10 design differential pressure
limiting pressure difference across the upstream and downstream sides of the closure element seals when the valve is in the closed position
Note Ito entry: While the standard is for this to he equal to the CWP there may be circumstances that dictate a lesser pressure difference.
2.11 double block-and-bleed valve
valve with two separate closure seating surfaces that, when in the closed position, block flow from both ends where the cavity between the two seating surfaces is fitted with a bleed connection to which either temporary or permanent piping or piping components may be installed.ISO 5208 pdf free download.
Tags: Industrial valves
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