Seamless, Welded, Duplex, Stainless Steel & Alloy Steel

Applicable Standards

• API Specification 5L — Line Pipe, including applicable PSL 1 and PSL 2 requirements.
• API Specification 5LC — Corrosion-resistant alloy line pipe, where specified by the project.
• ASTM A106/A106M — Seamless carbon steel pipe for high-temperature service.
• ASTM A53/A53M — Carbon steel pipe, where applicable to the specified service.
• ASTM A333/A333M — Seamless and welded steel pipe for low-temperature service.
• ASTM A335/A335M — Seamless ferritic alloy-steel pipe for high-temperature service.
• ASTM A312/A312M — Seamless, welded, and heavily cold-worked austenitic stainless steel pipe.
• ASTM A790/A790M — Seamless and welded duplex stainless steel pipe.
• ASTM A928/A928M — Ferritic/austenitic duplex stainless steel pipe with fusion-welded seams, where applicable.
• ASTM A999/A999M — General requirements for alloy and stainless steel pipe, where applicable.
• ISO 3183 — Steel pipe for pipeline transportation systems, where specified.
• ISO 21809-1 — External 3-layer polyethylene and polypropylene coatings.
• ISO 21809-2 — External fusion-bonded epoxy coatings.
• ISO 21809-5 — External concrete coatings for buried or submerged pipelines.
• NACE MR0175 / ISO 15156 — Materials for H₂S-containing oil and gas production environments, where applicable.
• ASME B31.3 / ASME B31.4 / ASME B31.8 — Applicable process piping and pipeline design codes.

Applicable standards depend on the pipe material, manufacturing route, service conditions, coating system, and project specification. Coating standards are not substitutes for the base pipe material standard.

Materials & Available Grades

Carbon Steel Line Pipe

Carbon steel line pipes are widely used in oil and gas transmission, water pipelines, refinery facilities, and general industrial services.

Available in seamless and welded construction, depending on the applicable standard, grade, size, and manufacturing route.

High-Strength Pipeline Steel

High-strength line pipe is used for transmission systems where specified strength, toughness, weldability, and operating conditions govern material selection.

• API 5L X42, X52, X60, X65, X70 and other available grades.
• PSL 1 and PSL 2, where applicable.
• Additional requirements for impact toughness, hardness, carbon equivalent, sour service, and fracture control where specified.

Stainless Steel Line Pipe

Stainless steel pipes provide corrosion resistance for chemical processing, refining, utilities, and other demanding industrial services.

Duplex and Super Duplex Line Pipe

Duplex materials offer a combination of strength and corrosion resistance for demanding process and marine environments.

Grade selection depends on chloride concentration, temperature, pressure, corrosion conditions, and project qualification requirements.

Alloy Steel Line Pipe

Alloy steel pipes are available for specified high-temperature, pressure, and specialized industrial services.

Material selection note: API 5L grades, ASTM pipe grades, and alloy-steel grades are not interchangeable designations. Each order must specify the correct product standard, grade, manufacturing process, and delivery condition.

Pipe Coating and Surface Protection

3LPE — Three-Layer Polyethylene Coating

A multi-layer external coating system typically consisting of a fusion-bonded epoxy primer, adhesive layer, and polyethylene outer layer. It provides corrosion protection and resistance to mechanical damage for buried and other specified pipeline applications.

• Standard: ISO 21809-1, where applicable.
• Suitable for project-specified buried pipeline systems.
• Coating thickness, surface preparation, holiday testing, and field-joint requirements are specified by the project.

FBE — Fusion-Bonded Epoxy Coating

A thermoset epoxy coating applied to prepared steel surfaces to provide corrosion protection. FBE is used in buried pipeline systems and can also serve as the corrosion-protection layer beneath a concrete weight coating.

• Standard: ISO 21809-2, where applicable.
• Coating thickness and performance requirements according to the project.
• Holiday testing and coating inspection as specified.
• Protective handling and packing to prevent coating damage during transportation.

Concrete Weight Coating

Reinforced concrete coating applied externally to provide additional negative buoyancy and mechanical protection for submerged or other specified pipeline installations.

• Standard: ISO 21809-5, where applicable.
• Available over bare pipe or a specified anti-corrosion coating system.
• Concrete thickness, density, reinforcement, and compressive strength according to project requirements.
• Suitable for offshore and submerged pipeline applications where specified.

Standard Black Paint

Elite supplies standard black-painted pipes for orders that do not require a specialized external coating system.

• Standard surface cleaning and black paint, as specified.
• Protective end caps on both ends, where applicable.
• Size, grade, heat number, and other required identification markings.
• Bundled and secured for storage and export shipment.

The 3LPE and concrete coating descriptions align with the applicable ISO coating standards. Final coating systems, application requirements, and inspection criteria are confirmed against the project specification.

Part 5: External concrete coatings
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Manufacturing and Quality Assurance

Elite coordinates line pipe supply according to the specified manufacturing standard, material grade, inspection plan, and project documentation requirements.

Quality activities may include:

• Verification of material chemistry and mechanical properties.
• Dimensional inspection, including outside diameter, wall thickness, length, straightness, and ovality.
• Hydrostatic testing, where required by the applicable pipe standard.
• Nondestructive examination (NDE), including ultrasonic testing, radiographic testing, magnetic particle testing, or liquid penetrant testing, as applicable.
• Weld inspection for welded pipes according to the applicable manufacturing specification.
• Positive Material Identification (PMI), where specified.
• Hardness and impact testing for applicable grades and service conditions.
• Coating thickness, adhesion, holiday detection, and other coating tests as required.
• Third-party inspection and witness points according to the approved Inspection and Test Plan (ITP).

For sour-service applications, material suitability and testing must meet the specified requirements of NACE MR0175 / ISO 15156. Compliance is confirmed for the actual material grade, product form, manufacturing condition, and service environment; it is not assumed for every pipe supplied.