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OQ PDO OQEP flange fitting color band requirements according to BS381

Flange Fitting Color Band Requirements According to BS381.

Our company recently completed a new order — from Oman Oil Company Exploration & Production LLC and Petroleum Development Oman flange fitting color band requirements according to BS381.

The British Standard BS 381 provides a color coding system for identification and marking of pipeline and flange fittings. The color band requirements for flange fittings according to BS 381 are as follows:

Flange Facings:

Raised Face: Blue
Tongue and Groove: Red
Male and Female: Yellow
Ring Type Joint: White
Flange Materials:

Carbon Steel: Yellow
Stainless Steel: Green
Alloy Steel: Brown
Non-ferrous Metals: Blue
It’s important to note that the color coding may vary depending on the specific application and industry standards. Always refer to the latest version of the relevant standard for accurate and up-to-date information.

Guidelines for Marking and Color Coding of Piping Materials According to Industry Standards

Marking and color coding of piping materials are important for identification and traceability in industrial and construction settings. The marking and color coding of piping materials are typically done according to industry standards and specifications. Here’s a general guideline for marking and color coding on piping materials:

Pipe Material Marking:

The following information is typically marked on the pipe:
Nominal Pipe Size (NPS)
Schedule (wall thickness)
Material Grade
Heat Number or Batch Number
Manufacturer’s Name or Symbol
Country of Origin
Color Coding:

Pipes and fittings are often color coded for easy identification. The color coding may vary depending on the industry and application, but some common color codes include:
Carbon Steel: Yellow
Stainless Steel: Green
Copper: Brown
PVC (Polyvinyl Chloride): White
CPVC (Chlorinated Polyvinyl Chloride): Cream
Labels and Tags:

In addition to color coding, labels and tags with printed information are often attached to pipes and fittings to provide detailed identification.
Industry Standards:

Always follow the relevant industry standards and specifications for marking and color coding of piping materials. For example, ASME A13.1 provides guidelines for pipe marking, and BS 1710 provides guidance on the identification and color coding of pipelines.
It’s important to note that specific industries and applications may have their own unique requirements for marking and color coding of piping materials. Always refer to the applicable standards and consult with industry professionals for accurate and up-to-date information.

Flange Fitting Color Band Requirements According to BS381

MARKING AND COLOR CODING

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.
1.1 PIPES

  • Marking on pipes shall be in accordance with the applicable ASTM number.
  • Pipes specified as Sour shall be marked with “SOUR” behind the ASTM designation.
  • If pipe is specified by wall thickness (instead of by schedule), then the wall
    Thickness in millimeters shall be included in the marking

1.2 FLANGES

  • Marking on flanges shall be in accordance with the MSS SP-25, ASME B16.5 /
    B16.47, applicable ASTM number.
  • Marking shall include the pipe schedule number or nominal thickness in millimeter.

1.3 FITTINGS

  • Marking on fittings shall be in accordance with the ASME B16.9, applicable ASTM
    Number.
  • Fittings specified as Sour shall be marked with “SOUR” behind the ASTM designation.
  • For Branch fittings, marking shall be in accordance with MSS SP-25.
  • For Branch outlet fittings, marking shall be in accordance with MSS SP-97.

1.4 GASKETS

  • Marking on all gaskets shall be as per the requirements mentioned in ASME
    B16.20.
  • For Branch outlet fittings, marking shall be in accordance with MSS SP-97.

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

MaterialColourBS 381 Reference
Carbon Steel ( Non -Sour Service)None None
Carbon Steel – Sour (Pipes, Fittings, Flanges) Salmon Pink447
Stainless Steel (Pipes, Fittings ,Flanges) Rail Red593
Duplex Stainless Steel (Pipes, Fittings, Flanges) Light Orange557
ASTM A 193 Grade B7M (Stud bolts) Lemon355

3.1 PIPES
Each length of pipe shall be painted over the entire length with a 12 mm to a 40 mm
wide stripe, depending on pipe size
3.2 FITTINGS
The entire length of each butt weld fitting shall be painted on the outside surface with a
12 mm to 40 mm wide stripe, depending on size.
Butt welding fittings shall include all Branch fittings and Branch outlets with butt welding
ends.
3.3 FLANGES, SPECTACLE BLINDS, SPACER & BLANKS ETC
The outer peripheral edge of each flange shall be painted over the entire circumference.
For flanges thicker than 25 mm, the width of the band may be limited to 25 mm.
Branch fittings with flanged ends (Flanged Outlet) shall be marked and color coded
using the same philosophy as for flanges.
3.4 BOLTING
Each stud bolt shall be dabbed with a spot of paint on each end.
3.5 SPECIAL NOTES
Paint shall not be applied, in any circumstances, to the following
· Inside surfaces of pipe, flanges or fittings;
· Threads;
· Weld bevels;
· Symbols or markings which would obliterate identification;
· Gasket seating surface
3.6 GASKETS
Color Coding of all spiral wound gaskets shall be as per Table 19 of ASME B16.20.
3.7 REJECTED MATERIALS
· Rejected Material shall be identified by markings and quarantined from acceptable
material.
· Replacement of rejected material shall be in accordance with the procurement
contract.
· Supplier, shop fabricator or field fabricator as applicable shall submit to the
purchaser an explanation for the rejected material. This shall identify the root cause
and include a plan for corrective action.

4.QUALITY ASSURANCE
The Supplier shall demonstrate that he operates a quality system in accordance with an
ISO 9001: 2015. The effectiveness of the quality system and the Suppliers compliance
with it shall be subject to monitoring by the Company and in addition, may be audited
following an agreed period of notice.
Supplier shall comply with the requirements of Quality Management Requirements for all
piping materials.
The Supplier QC requirements for the materials shall be in accordance with Purchase
Order Quality Requirements for Pipes & Fittings.
The relevant criticality rating shall be indicated in the respective Material Requisition for
the piping items.

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