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Normas DIN – AENOR
DIN EN ISO 28921-2:2016-09

DIN EN ISO 28921-2:2016-09

Industrial valves - Isolating valves for low-temperature applications - Part 2: Type testing (ISO 28921-2:2015); German and English version prEN ISO 28921-2:2016 / Note: Date of issue 2016-08-12

Robinetterie industrielle - Robinets d'isolement pour application à basses températures - Partie 2: Essais de type (ISO 28921-2:2015); Version allemande et anglaise prEN ISO 28921-2:2016 / Attention: Date de parution 2016-08-12

Industriearmaturen - Absperrventile für die Anwendung im Niedertemperaturbereich - Teil 2: Typprüfung (ISO 28921-2:2015); Deutsche und Englische Fassung prEN ISO 28921-2:2016 / Achtung: Erscheinungsdatum 2016-08-12

Fecha Anulación:
2017-05 /Withdrawn
Equivalencias internacionales:

ISO 28921-2 (2015-11)

prEN ISO 28921-2 (2016-07)

Relación con otras normas DIN:

Reemplazada por: DIN EN ISO 28921-2:2017-05

Resumen:
This part of ISO 28921 specifies requirements for the type testing of isolating valves for low-temperature applications to verify the performance of valves at a low temperature from - 50 °C down to - 196 °C. NOTE: Nominal sizes (DN), nominal pipe sizes (NPS), nominal pressure (PN) and Classes are covered in ISO 28921-1. This part of ISO 28921 does not evaluate valve actuators unless they are integral part of the valve. Valves during testing can be operated manually or an actuator can be used during the testing. The effect of cold gas vapours during testing is taken into consideration in particular if the actuator is mounted directly over the test stand with the cold gases engulfing the actuator. This part of ISO 28921 does not apply to valves for cryogenic services, designed in accordance with ISO 21011, used with cryogenic vessels.
Keywords:
Ball valves, Butterfly valves, Check valves, Connection valves, Definitions, Design, Dimensions, Fitness for purpose, Gas valves, Gate valves, Globe valves, Industrial fittings, Liquefied natural gas, Low temperatures, Manufacturing, Marking, Natural gas, Packages, Piping system, Qualification tests, Separating device, Shut-off valves, Specification (approval), Stop valves, Testing, Valves
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