Metal tubing, in particular of steel; penstock pipes of steel for the transportation of petroleum and/or natural gas; junctions of metal, in particular of steel, for pipes, in particular for oil pipelines and gas pipelines; gastight thread couplings of metal, in particular of steel, in particular for oil pipelines or gas pipelines; pipe muffs of metal, in particular of steel; threaded pipes of metal, in particular of steel; manifolds of metal for pipelines; pipe strings of metal for the extraction of petroleum and natural gas; oilfield pipes of metal; coiled tubing of metal for oil fields and gas fields.

Installation of threaded pipes and/or gastight thread couplings of metal; repair and maintenance of threaded pipes and/or gastight thread couplings of metal.