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Gas supply|Dimensions|Pressure|Pipes|Gas pipes|Plastics|2nd family gases|Pressure testing|Fire safety in buildings|Safety measures|Leak tests|Fire safety|Installation|Flow rates|Malleable cast-iron|Size|Corrosion|Corrugated|Steels|Corrosion protection|Walls|Floors|Buildings|Valves|Ventilation|Joints|Domestic pipework systems|Pipework systems|Copper|Pipe fittings|Design|Gas circuits|Pipe supports|Underground|Stainless steels|Design calculations