Flange Fitting Color Band Requirements According to BS381
1. MARKING OF PIPING MATERIALS
Marking shall generally be accomplished by either one or a combination of casting-out,
forging-out, punching, stenciling, tagging, labeling and taping. Punching or die stamping
if used shall be low stress stamps (dot or round bottomed) with at least 6 mm high.
Stenciling color shall be black; however, for piping components whose surfaces are
black or dark, it shall be white.
2. COLOR STANDARD
BS 381C color standard shall be used. For piping commodities, which require PMI
(Positive Material Identification), Marking and color-coding shall be done only after the
successful completion of PMI on the final product.
Paint shall be resistant to salt water atmosphere and tropical climate, and be durable
and of a distinctive identifying color. It shall not cause corrosion of the material to which
it is applied, neither during storage and construction, nor during operation of the
equipment.
Paints and markers shall not contain harmful metals or metal salts such as Zinc
Aluminum, Lead or Chlorides, sulphur or other halogens that may be harmful to the
alloy.
Color coding marks shall not obliterate any other markings required by COMPANY
General Specifications, International Standards, codes, applicable local laws and
regulations.
3. METHOD OF IDENTIFICATION.
The following color codes for Bulk Piping Materials shall be applied
Carbon Steel ( Non -Sour Service) None None
Carbon Steel – Sour (Pipes, Fittings, Flanges) Salmon Pink 447
Stainless Steel (Pipes, Fittings ,Flanges) Rail Red 593
Duplex Stainless Steel (Pipes, Fittings, Flanges) Light Orange 557
ASTM A 193 Grade B7M (Stud bolts) Lemon 355
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