Three of the five external gas meter boxes at some flats we done in Litherland Park. The supply pipes from the meters to the flats was routed in galvanised mild steel on the outside of the building. It is then ordinary mild steel in the communal hallway / stairwell before switching to copper tube inside the flats. The cutting, threading and jointing of the steel brought back happy memories of my apprenticeship were we done a lot of this type of work. All of the joints on this job were cut and threaded using our hand threader. On bigger steel jobs or when working with larger bore pipework we will normally hire a threading machine.
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