ISO 4126-3:2020 PDF

Scope: This document specifies only the requirements for a product assembled from the in-series combination of safety valves or CSPRS (controlled safety pressure relief systems) according to ISO 4126-1, ISO 4126-4 valve within five pipe diameters of the valve inlet. It specifies the design, application and marking requirements for such products, composed of the bursting disc safety device, a safety valve or CSPRS and, where applicable, a connecting pipe or spool piece. In addition, it gives a method for establishing the combination discharge factor used in sizing combinations.

ISO 4126-3:2020 Referenced Document

ISO 4126-1:2013 Safety devices for protection against excessive pressure - Part 1: Safety valves
ISO 4126-2:2018 Safety devices for protection against excessive pressure — Part 2: Bursting disc safety devices
ISO 4126-4:2013 Safety devices for protection against excessive pressure - Part 4: Pilot operated safety valves
ISO 4126-5:2013 Safety devices for protection against excessive pressure - Part 5: Controlled safety pressure relief systems (CSPRS)
ISO 4126-6:2014 Safety devices for protection against excessive pressure - Part 6: Application, selection and installation of bursting disc safety devices
ISO 4126-9:2008 Safety devices for protection against excessive pressure - Part 9: Application and installation of safety devices excluding stand-alone bursting disc safety devices

2020 ISO 4126-3:2020 Safety devices for protection against excessive pressure — Part 3: Safety valves and bursting disc safety devices in combination
2006 ISO 4126-3:2006 Safety devices for protection against excessive pressure - Part 3: Safety valves and bursting disc safety devices in combination