This specification is part of a series of Institution of Gas Engineers and Managers (IGEM) publications, providing a specification for selecting meter regulators.
British Gas and latterly, National Grid Metering (NGM) developed a series of specifications for key metering components based on its own suite of product requirements. These documents were made available to meter installers and purchasers under the title of Product Requirement Specification (PRS) 'e' documents. Originally these Specifications were made available through Advantica, as they were known at the time.
NGM has transferred the ownership of these documents to IGEM to make them available to the wider industry. It is some years since the original 'e' documents were updated and these have been withdrawn.
This Specification sets out the product requirements for meter regulators and covers regulators for use with 2nd family gas at flow rates not exceeding 6 m³ h-1. Regulators to this Specification are suitable for a maximum operating pressure not exceeding 75 mbar and a maximum incidental pressure of 200 mbar. The operating temperature range of the regulators is -20°C to +60°C.