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Public consultation period: From 17th July 2020 until 15th October 2020, inclusive.


This Standard applies to the design, construction, inspection, testing, operation, maintenance and decommissioning of steel pipelines and pipeline installations for the transmission of 1st and 2nd family gases, natural gas and substitute natural gas, (e.g. Bio-methane gas) at maximum operating pressures over 16 bar and temperatures between – 25 °C and + 120 °C. The upper pressure limit is not defined but in current general practice this extends up to 100 bar.

This standard applies to onshore pipelines including water crossings.

This standard excludes pipelines, the greater part of whose length is offshore.

Further requirements for pressure regulating stations are detailed in Annex A.

Note 1: For service lines at the inlet pipework of the pressure regulating station with a maximum upstream operating pressure not exceeding 16 bar and a design flow rate equal to or less than 200 m3/h under normal conditions, see I.S. EN 12279.

Further requirements for pipeline installations other than pressure regulating stations are detailed in Annex B.

Abandonment of pipeline installations is excluded from this standard.

Compressor stations and compressed natural gas (CNG) filling stations are excluded.

Note 2: For any pipe or pipework of MOP not exceeding 16 bar, see I.S. 329.


Edition 3 of this standard was published in 2015.

I.S. 328 has been revised to provide further guidance in the design, construction, inspection, testing, operations and maintenance of pressure regulating stations and other pipeline installations.


View the draft and submit comments:

All interested parties are invited to comment on the draft revision of I.S. 328 through the NSAI “Your Standards Your Say” (YSYS) forum.