FEN Publications

This Gas Industry Standard specifies requirements for the site and workshop fusion welding and inspection of austenitic stainless steel pipework designed to work at pressures up to 110 bar and temperatures up to 150°C.

This guidance note has been developed to outline the ongoing compliance of the Electrical and Instrumentation (E&I) assets within the Grid Entry Units (GEU) at existing biomethane sites. The ENA are issuing this guidance to set out the expectations of the DFO from Cadent, NGN, SGN and WWU in regard to IGEM/TD/16 and the network entry agreement for ongoing E&I maintenance. 

This Part 9 of GIS/PL2 specifies the requirements for flexible twin-walled corrugated pipe. For convenience, they will to be referred to as flexible pipes in this standard. The flexible pipes are for use at operating pressures not greater than 75 mbar and operating temperatures in the range from -20°C to 40°C.

This specification provides requirements for the welding of steel land pipelines, designed to carry non sour dry natural gas and to operate at pressures greater than 7 bar; in accordance with IGEM/TD/1 in the UK, or IS 328 in the Republic of Ireland. This specification details the requirements for the welding of carbon, carbon manganese and low alloy steel pipelines with specified minimum yield strengths (SMYS) not exceeding 555 N/mm2 (i.e., grade L555 or X80).

This specification details the Gas Transporter requirements for the welding and inspection of carbon, carbon manganese and low alloy steel pipe and steel fitting components for gas distribution systems delivering natural gas at pressures not greater than 7 bar.

This Specification gives the requirements for the weldability testing of fittings for service in pipelines and pipework of carbon and carbon-manganese based steels at pressures above 7 bar.

This guidance note provides information to Gas Transporters associated with gas maintenance activities within multi-occupancy buildings (MOBs) and the associated liaison with relevant Building owners, Managing Agents, Local Authorities, Building Safety Managers who manage such buildings

This Gas Industry Standard specifies requirements for metal-bodied valves, for gas distribution purposes. The valves shall be suitable for use at temperatures within the range –20 °C to 60 °C. The valves are for use as line valves up to 16 bar MOP (maximum operating pressure) or construction valves up to 7 bar MOP and the MOP of the valve shall be specified in the purchase order.

This Gas Industry Standard (GIS) specifies requirements relating to fittings for pipe connections to in-pipe close fit lined pipes operating at a maximum working pressure of up to 2 bar. It applies to connections to grey cast iron, ductile iron and steel distribution pipes with either lead yarn or mechanical type joints.

This Gas Industry Specification (GIS) specifies requirements relating to metallic-bodied fittings for connecting ancillary fittings such as service fittings, plugs, by-pass riders and flow stop equipment to steel, grey or ductile cast iron in-pipe close fit lined pipes at pressures not greater than 2 bar.

This specification specifies fusion bonded epoxy powders and multi-component liquid materials for use as anti-corrosion coatings on steel line pipe and fittings (tees and bends) used for the transmission and distribution of natural or manufactured gas as defined in ISO 13623.

Following the legislative update to the Gas Safety (Management) Regulations 1996 in April 2023, which implemented a number of changes to the legal obligations, GDNs would like to reinforce the specific requirement regarding the need for pipelines conveying biomethane to be operated with a safety case.

The issue of volume flow rates falling below acceptable uncertainty levels at National Gas Transmission to GDN offtakes, caused by increasing biomethane flow rates, has been raised at industry forums in relation to possible constraints placed upon the development of new biomethane sites.

This document’s purpose is to provide an outline on Local Gas Treatment (LGT) odorisation equipment.

This Gas Industry Standard specifies the requirements for materials, design, performance and testing of mechanical fittings in the nominal size range 16 mm to 800 mm inclusive intended for use with polyethylene (PE) pipe conforming to GIS/PL2-2 or GIS/PL2-8 of the same nominal size and at operating temperatures from –20°C to +40°C.

This Gas Industry Standard specifies requirements for the components used in external press fit stainless steel network riser systems supplying multiple occupancy premises with natural gas in accordance with IGEM/G/5 at pressures up to and including 75 mbar and diameters up to 108mm.

The graphic illustrates the location of connected and accepted generation sites across the four GDNs by size of MW output.

This Gas Industry Standard (GIS) specifies the requirements for metallic or plastic-bodied main sealing plugs and service connection fittings for connecting steel or polyethylene (PE 80) service pipe to steel, grey cast iron and ductile iron pipes at pressures not greater than 2 bar. It applies to PE 80 (MDPE) polyethylene pipe only.

This Gas Industry Standard (GIS) specifies requirements for horizontal non-percussion searcher bars and vertical percussion searcher bars for use in bar holing operations. It also specifies the performance requirements for their electrical insulation

This part of GIS/PL2 specifies requirements for squeeze-off tools and equipment used in the maintenance of polyethylene systems constructed from pipe of nominal size 16 mm to 630 mm inclusive and conforming to GIS/PL2-2.