Product Overview

ERW Steel Pipe with Internal Epoxy and External Polyester Coating is designed for pipeline systems that require a steel structure combined with internal and external surface protection. Produced using the electric resistance welding (ERW) process, this pipe is suitable for selected fire protection, municipal water supply, and industrial pipeline applications, subject to the relevant design and technical requirements. The product features an internal epoxy powder coating and an external polyester powder coating. These two coating layers serve different protective purposes, helping protect the steel pipe in accordance with its intended service environment. The internal epoxy coating forms a protective barrier between the steel surface and the conveyed medium when correctly selected for the application. It can help reduce direct contact between the steel and water or other compatible fluids, supporting corrosion control and helping limit surface deposits under suitable operating conditions. The external polyester powder coating provides a protective finish for the outside surface. Its suitability depends on the environmental exposure, surface preparation, coating thickness, curing process, and installation conditions. The coating specification should be confirmed according to the intended application. ERW Manufacturing Process Electric resistance welded steel pipe is manufactured by forming steel strip into a tubular shape and joining the longitudinal seam using an electric resistance welding process. This manufacturing method supports consistent pipe production when appropriate process controls and inspection requirements are applied. Important product parameters include outside diameter, wall thickness, pipe length, steel grade, end preparation, and dimensional tolerances. These details should be defined according to the buyer's drawings, technical specifications, and applicable standards. The suitability of an ERW steel pipe for a particular pressure service depends on its material, dimensions, weld quality, manufacturing requirements, and relevant engineering calculations. Pressure ratings should therefore be confirmed from the actual product documentation rather than inferred from the coating system or manufacturing method alone. Internal Epoxy Powder Coating The internal epoxy powder coating is designed to provide a protective layer on the pipe's inner surface. In suitable applications, this coating helps isolate the steel from the transported medium and supports internal corrosion control. A properly specified internal coating may also help maintain a smoother pipe surface and reduce the accumulation of deposits compared with an unprotected steel surface under comparable conditions. Actual flow performance and resistance to scaling depend on the fluid composition, operating conditions, coating quality, and maintenance practices. For water supply applications, the coating must be compatible with the water quality and intended use. If the pipe is intended for potable water, applicable drinking-water contact requirements should be verified before purchase. External Polyester Powder Coating The external polyester powder coating provides a finished protective layer on the pipe's outer surface. Its purpose is to help protect the steel against environmental exposure and support surface durability under the specified service conditions. Coating performance depends on the selected polyester formulation, substrate preparation, application thickness, curing conditions, storage, transportation, and installation. For outdoor or chemically exposed installations, the coating's suitability should be confirmed against the actual environmental requirements. During handling and installation, coated surfaces should be protected from scratches, impact, and other damage that could compromise the coating. Any damaged areas should be assessed and repaired in accordance with the relevant coating repair procedure. Applications This coated ERW steel pipe may be considered for the following applications, provided that the product specification and applicable requirements are satisfied: - Fire Protection Systems: For suitable fire protection pipeline networks where the pipe meets the required fire system standards, pressure requirements, and project approvals. - Municipal Water Supply: For selected water distribution systems using compatible internal coating materials. - Industrial Pipeline Systems: For transporting compatible fluids in industrial facilities. - Building Services:** For selected utility and mechanical pipeline systems according to the applicable design requirements. - Water Circulation Networks:** For suitable circulation and service-water applications where the pipe material and coatings meet the operating conditions. The final application should be determined by the design pressure, fluid characteristics, temperature, installation environment, and applicable local standards. Product Specifications and Customization Product specifications can be established according to the actual manufacturing range and project requirements. Depending on availability, buyers may specify outside diameter, wall thickness, pipe length, steel grade, internal epoxy coating, external polyester powder coating, and end connection type. Threaded, grooved, and flanged connections may be available where supported by the product design and manufacturing capability. Connection details should be confirmed before production to ensure compatibility with the installation system. For project quotations, buyers are encouraged to provide the required dimensions, quantity, application, operating conditions, coating specifications, connection type, applicable standards, and delivery destination. Quality Control, Packaging, and Delivery Quality inspection should be defined according to the purchase specification and intended application. Relevant checks may include dimensional verification, weld inspection, coating thickness measurement, visual examination, and other agreed tests. Any claimed pressure performance, chemical resistance, weather resistance, certification, or service life should be supported by applicable technical data or test documentation. During packaging and transportation, the pipe ends and coated surfaces should be protected against impact, abrasion, and moisture-related damage as appropriate. Packaging and loading arrangements should be selected according to the pipe dimensions, order quantity, transportation method, and destination. Request a Quotation For ERW steel pipe with internal epoxy and external polyester powder coating, buyers can provide their required diameter, wall thickness, pipe length, coating details, connection type, quantity, and intended application. These details help establish a clear technical specification and support a quotation aligned with the project's requirements. Product availability, coating performance, pressure suitability, inspection scope, and delivery arrangements should be confirmed before order placement.

Applications:

- Fire Protection Pipeline Systems: For suitable fire protection networks where the pipe meets the applicable pressure, material, and fire system requirements. - Municipal Water Supply: For water distribution systems requiring internal corrosion protection and a coated external surface. - Industrial Fluid Transportation: For conveying compatible fluids in industrial plants and processing facilities. - Building Utility Systems: For selected building service and mechanical pipeline applications. - Water Circulation Systems: For suitable service-water and circulation networks. - Commercial and Industrial Infrastructure: For pipeline installations where the specified steel pipe dimensions, coatings, and connections meet project requirements. - Threaded Pipeline Installations: For compatible systems designed for threaded pipe connections. - Grooved and Flanged Pipeline Networks: For installations using compatible grooved couplings or flange connections, subject to the actual product configuration.

Advantages：

- Dual Powder Coating System: Combines internal epoxy powder coating with external polyester powder coating to provide protection for both pipe surfaces. - Internal Corrosion Protection: The epoxy layer helps isolate the steel from compatible transported fluids and supports internal corrosion control. - External Surface Protection: The polyester coating provides a protective finish suited to specified environmental conditions. - ERW Steel Construction: Offers a longitudinally welded steel pipe option for applications that meet the required material and dimensional specifications. - Smooth Internal Surface: A properly applied internal coating can help provide a smooth flow surface and reduce deposit accumulation under suitable operating conditions. - Multiple Connection Options: Threaded, grooved, and flanged connections may be available according to product design and confirmed manufacturing capability. - Project-Specific Specifications: Pipe dimensions, coating requirements, end preparation, and connection details can be defined according to project needs. - Quality Inspection Options: Dimensional checks, weld inspection, coating thickness measurements, and other tests can be specified according to the purchase requirements. - Application Flexibility: Can be considered for suitable fire protection, water supply, and industrial pipeline systems after verification of applicable technical requirements. - Protective Packaging: Appropriate packaging and handling measures help reduce the risk of coating damage during storage and transportation.

FAQ：

Q1: What is the minimum order quantity for 3LPE coated steel pipe? A: The minimum order quantity is 1 ton. Please confirm the required pipe specifications and quantity with us before placing an order. Q2: What is 3LPE coating? A: 3LPE stands for three-layer polyethylene coating. It generally consists of a fusion-bonded epoxy primer, an adhesive layer, and a polyethylene outer layer designed to protect the external steel surface against corrosion. Q3: Is API 5L steel pipe available with 3LPE coating? A: API 5L steel pipe with 3LPE coating can be discussed according to the required grade, applicable standard, and confirmed manufacturing scope. Please provide your technical specifications for verification. Q4: Can pipe dimensions and coating specifications be customized? A: Pipe dimensions, wall thickness, length, and coating requirements can be reviewed according to project needs and actual manufacturing capabilities. Please send your required specifications for confirmation. Q5: What applications are suitable for 3LPE coated steel pipe? A: Depending on the pipe grade, coating specification, and service conditions, it can be considered for suitable oil, gas, water transmission, underground pipeline, and industrial pipeline projects. Q6: What quality inspections are available? A: Inspection items depend on the agreed technical specification. They may include dimensional checks, visual inspection, coating thickness, coating continuity, adhesion, and other applicable tests. Available inspection records and documents should be confirmed before ordering. Q7: How can I obtain a quotation? A: Please provide the required steel grade, outside diameter, wall thickness, pipe length, quantity, coating specification, and delivery destination. Drawings or technical documents are also helpful for preparing a project-specific quotation. Q8: How is the pipe packaged for transportation? A: Packaging is arranged according to pipe dimensions, coating protection requirements, shipping method, and destination. Please share your delivery requirements so the suitable packaging and logistics arrangements can be discussed.