What Does ISO 14726:2008 Identify?

The current ISO 14726:2008 is titled Ships and marine technology — Identification colours for the content of piping systems. ISO states that it specifies main and additional colours according to a system’s content or function. The colours can also be used on drawings and diagrams. ISO lists medical gases, industrial gases and cargo piping outside its scope.

How to Read Marine Copper Nickel Pipe Marking

Marking format depends on the governing product standard, edition, project specification, dimensions and purchaser’s supplementary requirements. A buyer or inspector should normally look for enough information to connect the item to the order and inspection documents. Common fields to check include:

• Manufacturer or traceable identification that can be matched to the certificate package.
• Обозначение материала, such as the exact UNS number or another designation required by the order.
• Product specification, for example ASTM B466/B466M when it governs seamless copper-nickel pipe or tube.
• Size and wall information stated in the units and format required by the order.
• Heat, lot or traceability number that links the item to its MTC and test records.
• Temper or condition where required by the product specification and purchase order.

A partial or worn stamp is not automatically a rejection, but it is not enough for positive identification. Hold the item for document review and follow the project’s traceability procedure before installation.

90/10 против 70/30 Copper Nickel Identification

The Copper Development Association wrought copper-nickel data helps explain why PMI can readily separate the common 90/10 и 70/30 families by nickel content. It does not replace the ordered material specification or certified test report.

ASTM B466/B466M covers several seamless copper-nickel pipe and tube alloys, including C70600, C70620, C71500 and C71520. ASTM’s public scope notes that C70620 and C71520 are intended for products that will subsequently be welded. The commercial labels “90/10,” “70/30” and “Cunifer” are therefore not complete purchase descriptions.

Six-Step Verification Workflow

1. Record the as-received marking. Photograph the full line before cleaning, cutting or fabrication. Keep the item tag and packing reference.
2. Match the order. Compare alloy, форма продукта, specification, размер, стена, temper and quantity with the purchase order and approved drawing.
3. Trace the heat or lot. Confirm that the physical identifier maps to the MTC and any ordered inspection documents.
4. Check certificate identity. Review the exact UNS and specification edition, not only a broad description such as Cu-Ni, 90/10 or Cunifer.
5. Use PMI when required. PMI can support alloy-family verification, but the method, calibration, acceptance criteria and sampling plan must come from the project requirements. PMI alone does not verify every dimensional, mechanical or manufacturing requirement.
6. Control discrepancies. Segregate mismatched or untraceable material and obtain a documented disposition. Do not recreate a missing heat number from appearance or colour.

Common Identification Mistakes

• Treating an ISO 14726 service colour as a material-grade code.
• Assuming all “Cunifer” items are the same UNS grade and product form.
• Reading 90/10 или 70/30 as a complete specification without checking the welding-modified designation.
• Accepting an MTC whose heat or lot number cannot be linked to the physical item.
• Using one PMI reading as proof of the complete lot without an approved sampling plan.
• Confusing a material standard with the dimensional or pressure-rating standard for flanges and fittings.

RFQ and Inspection Checklist

1. Component type and product form: pipe, трубка, фланец, fitting or valve.
2. Exact alloy and UNS number, including any welding-modified grade where applicable.
3. Governing material and dimensional standards with required editions.
4. Size, wall or schedule, end connection, facing and pressure class where applicable.
5. Service medium, расчетное давление и температура, seawater conditions and joining method.
6. Marking, heat/lot traceability, Тип МТС, PMI, NDE and third-party inspection requirements.
7. Quantity, упаковка, tag preservation and document-language requirements.

Часто задаваемые вопросы

Что такое ISO 14726:2008?

It is an identification-colour standard for the content or function of piping systems on ships and marine structures. ISO reports that the 2008 edition was reviewed and confirmed in 2024 and remains current.

Does ISO 14726 identify C70600 or C71500?

Нет. It identifies piping-system content or function by colour. Material grade requires product marking, traceability documents and any ordered verification.

Is Cunifer the same as copper nickel 90/10?

Cunifer is used commercially for copper-nickel-iron alloy families, but the word alone is not a complete material specification. Укажите точную оценку UNS, стандарт продукта, product form and condition.

Can XRF distinguish 90/10 from 70/30 медь-никель?

An appropriate PMI method can usually distinguish the two common families because their nickel ranges differ substantially. The approved procedure must define the instrument, calibration, surface preparation, sampling and acceptance criteria. PMI does not replace the MTC or prove all specification requirements.

What should be done when a pipe marking is unreadable?

Preserve the item, packing and photographs; check heat or lot traceability against the document package; and follow the project procedure for re-identification or testing. Do not install or remark the item based only on appearance.