Design considerations, materials and methods of installing steel or copper pipework in sizes not exceeding 28 mm (R1 of BS 21) for the supply of 2nd family gas in domestic dwellings.
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BS 6891:1988
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Specification for installation of low pressure gas pipework of up to 28 mm (R1) in domestic premises (2nd family gas)
BSI Group , 02/29/1988
Pages: 22
