ISO 5208-2015 pdf free download

ISO 5208-2015 pdf free download.Industrial valves Pressure testing of metallic valves
Robinetterie industrielle — Essais sous pression des appareils de robinetterie métalliques.
2.6
resilient seats
broad category of seating surface materials that make up a pliable seat sealing combination, including elastorneric, polymeric, solid and semi-solid grease seals, either used in combination or used in conjunction with a mating metallic or ceramic component
2.7
DN or NPS
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 I’N 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 meisurable value and is riot used lou 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 1 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 1 to entry: While the standard is for this to be 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
2.12
visually detectable leakage
leakage during a valve pressure test, either through or past a pressure boundary or closure member that is observed with normal vision.ISO 5208-2015 pdf free download.