Pipe & Fittings

Application:
steam, water, gas and air pipelines as well?as general machinery and tools for industry and construction.
Scope:?
?Covers seamless carbon steel nominal wall pipe for high-temperature service, suitable for bending flanging and similar forming operations.
?NPS 1-1/2″ and under may be either hot finished or cold drawn.
?NPS 2″ and larger shall be hot finished unless otherwise specified.
Process:
?Killed steel, with primary melting process being open-hearth, basic-oxygen, or electric-furnace, possible combined with separate degassing or refining.
?Steel cast in ingots or strand cast is permissible.
?Hot-finished pipe need not be heat treated.
?Cold-drawn pipe shall be heat treated after the final cold draw pass.
Permissible Variations in Wall Thickness:
The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.
Permissible Variations in?Weights per Foot:
Weight of any length shall not vary more than 10% over and 3.5% under that specified.
NOTE — NPS 4 and smaller — weighed in lots. Larger sizes shall be weighed separately by length.
Permissible Variations in?Outside?Diameter:
Outside Diameter at any point shall not vary from standard specified more than:
NPS [DN Designator] Over(in.) Over(mm) Under(in.) Under(mm)
1/8 to 1-1/2 [6 to 40],incl 1/64 (0.015) 0.4 1/64(0.015) 0.4
Over 1-1/2 to 4 [40 to 100], incl 1/32 (0.031) 0.8 1/32 (0.031) 0.8
Over 4 to 8 [100 to 200], incl 1/16 (0.062) 1.6 1/32 (0.031) 0.8
Over 8 to 18 [200 to 450], incl 3/32 (0.093) 2.4 1/32 (0.031) 0.8
Over 18 to 26 [450 to 650], incl 1/8 (0.125) 3.2 1/32 (0.031) 0.8
Over 26 to 34 [650 to 859], incl 5/32 (0.156) 0.40 1/32 (0.031) 0.8
Over 34 to 48 [850 to 1200], incl 3/16 (0.187) 4.8 1/32 (0.031) 0.8
Protection:
Pipes are supplied:
?black and bare
?external varnished with black or clear lacquer
?oiled