Applies to the design and construction of the ferrous pipework connecting a land steam boiler to engine, turbine or industrial plant and all auxiliary pipework in connection therewith, together with the pipes and pipe fittings forming parts of such installations for: pipes of any bore where the pressure exceeds 50 lb/sp.in.; and pipes over 10 in. bore for steam at pressures up to and including 50 lb/sq.in. This Standard does not apply to the use of carbon steel where the temperature exceeds 900 degrees F., or to the use of alloy steel where the temperature exceeds 1050 degrees F.