SIST EN 10310:2004

SIST EN 10310:2004 is the SIST adoption of EN 10310:2003, published by SIST. It specifies internal and external polyamide powder based coatings for steel tubes, fittings and related accessories used in onshore and offshore pipelines. In practice, it gives purchasers, coaters and coating manufacturers a shared basis for selecting the coating system, preparing the steel, and checking performance.

What does SIST EN 10310:2004 specify?

SIST EN 10310:2004 defines polyamide powder coatings applied by dipping in a fluidised bed, spraying or roto-coating. It covers coatings for the inner and outer surfaces of steel tubes and fittings used as pipeline components, including accessories such as valves, pumps and screens.

The standard applies to buried, submerged and above ground pipelines conveying fluids at working temperatures between 0 °C and + 60 °C, unless the purchaser and coater agree otherwise. For tubes carrying water intended for human consumption, the internal coating must not impair water quality beyond EU and EFTA requirements.

The document is organized into clauses 1 to 10 and normative annexes A to I.

What are the key requirements of SIST EN 10310:2004?

SIST EN 10310:2004 requires a primer film covered by a fully fused polyamide powder layer. That matters because the document treats the coating as a system, not just a single layer.

Surface preparation and application

Clause 7 requires abrasive blast cleaning to at least Sa 2½, with surface roughness Rz between 40 µm and 90 µm. The steel must be clean, dry and free from contamination, and the surface temperature must be at least 3 °C above the dew point before coating. In practice, this controls adhesion and reduces the risk of trapped moisture.

The primer is applied immediately after preparation, and the polyamide layer is then applied according to established procedures and the coating manufacturer’s recommendations. The coating manufacturer’s data sheet must include the listed product, processing and performance data. This means the coater needs documented application settings before production starts.

Purchaser information and agreed options

Clause 5 requires the purchaser to identify the tubes or components, reference the standard, and state the nature of the fluid being conveyed. The purchaser may also specify cut back length, chemical treatment, marking, maximum repair area and number of repairs, and maximum coating thickness. This is the point where project-specific limits are fixed.

Coating quality and acceptance

Clause 8 requires visual inspection for appearance and continuity, and the coating must be uniform, smooth and free from laminations. Thickness is measured by EN ISO 2808, with a minimum coating system thickness of 200 µm and 150 µm on sharp edges with a radius below 3 mm. In practice, buyers can also specify a maximum thickness where mating tolerances matter.

Performance is checked with holiday detection, impact resistance, adhesion, indentation resistance, and several durability tests. For example, adhesion must be rating 2 or better, and external coatings are also checked for specific electrical insulation resistance, cathodic disbondment, ultraviolet resistance, salt spray resistance, demineralized water immersion, flexibility and waste water resistance. These tests show whether the coating can survive handling and the intended service environment.

What terms does SIST EN 10310:2004 define?

• Coating manufacturer - the supplier of the coating material in a condition ready for application.
• Coater - the company that applies the coating to the tubes or components.
• Purchaser - the company that buys the coated products.
• Rz - the roughness parameter used for the prepared steel surface.
• Rs - the specific electrical insulation resistance, expressed in ohms square metres.
• k - the correction factor used for impact resistance.
• RT - room temperature.

Who uses SIST EN 10310:2004?

SIST EN 10310:2004 is used by pipe makers, fitting manufacturers, coating plants, pipeline purchasers and inspection personnel. It is relevant to onshore and offshore pipeline projects, especially where buried, submerged or above ground steel pipelines carry liquids.

Coaters use it to set up surface preparation, application and repair work. Quality managers and test laboratories use it to verify coating thickness, adhesion, insulation resistance and environmental resistance before shipment or acceptance.

What changed in SIST EN 10310:2004 from the previous edition?

SIST EN 10310:2004 is identified as identical to EN 10310:2003.

Which standards are used with SIST EN 10310:2004?

What does the SIST EN 10310:2004 document contain?

The document gives the coating description, purchaser information items, application guidance and repair rules. It also includes the handling, transportation and storage provisions needed to avoid damage after coating.

Clause 7 includes the product data sheet content in Table 1, and Clause 8 sets out coating properties and acceptance conditions in Table 2 and Table 3. The annexes provide full test methods, including apparatus, procedures and result recording.

Several annexes also define test setups and calculations. Annex C gives the formula for specific electrical insulation resistance, Annex D gives the UV exposure cycle and viscosity change calculation, and Annex I gives the dilute solution viscosity method for polyamide.