Yellow/Black 3PE Coated Steel Pipe 219mm OD with Beveled Ends for Welding

Engineered for efficient field installation and long-term subterranean durability, this 219mm OD Yellow/Black 3PE Coated Steel Pipe is a highly versatile piping solution for gas, oil, and water distribution networks. Featuring a standard 8-inch nominal diameter (219.1mm actual OD), this carbon steel pipe is supplied with factory-machined beveled ends, perfectly prepared for immediate, high-quality butt-welding on site.
The exterior is protected by a premium Three-Layer Polyethylene (3PE) coating, available in two options: high-visibility Yellow (ideal for gas lines and subterranean safety identification) or standard Black (highly UV-stabilized PE). This multi-layer composite system shields the underlying steel from soil moisture, corrosive chemicals, and stray electrical currents, ensuring a 30+ year maintenance-free lifespan in municipal and industrial utility installations.

Features & Advantages

Dual-Color Application Coding: Available in high-visibility Yellow (for easy visual warning to future excavation crews, standard for gas) and UV-resistant Black (the global standard for underground oil and water lines).

Installation-Ready Beveled Ends: Delivered pre-beveled (typically 30° to 35°) with a factory-controlled bare steel cutback, enabling immediate, precise field welding without the need for time-consuming on-site end preparation.

Impenetrable 3PE Protection: Synergizes the chemical bonding of an FBE primer, a copolymer adhesive layer, and a tough polyethylene outer shell to fully eliminate cathodic disbondment and localized soil corrosion.

Optimal Mid-Size Agility: The 219mm OD is the industry-standard size for municipal water mains, medium-pressure natural gas distribution, and oil gathering systems, offering excellent flow capacity and structural handling.

Technical Specifications

Specification Item	Detailed Description
Product Name	Yellow/Black 3PE Coated Steel Pipe
Base Pipe Material	API 5L Grade B, ASTM A53 Gr.B, GB/T 9711 (Seamless or ERW)
Outer Diameter (OD)	219.1 mm (Nominal 8 Inch)
Wall Thickness (WT)	Schedule 40 (8.18 mm) or customized based on pipeline design pressure
Coating Type	Three-Layer Polyethylene (3PE)
Coating Color Options	High-Visibility Yellow or Standard UV-Resistant Black
Coating Standards	DIN 30670, ISO 21809-1, GB/T 23257
End Finish	Beveled Ends for butt welding (with a standard 50mm-100mm bare steel cutback)
Standard Length	5.8m, 6.0m, 11.8m, 12.0m, or cut to custom lengths

Product Applications

Medium-Pressure Gas Distribution: High-visibility yellow-coated lines for natural gas and LPG municipal mains.

Municipal Water & Sewage Mains: Reliable, long-lasting black-coated subterranean lines for potable water supply and municipal drainage.

Crude Oil Gathering Systems: Connecting localized oil fields and storage facilities with corrosion-resistant transfer pipelines.

Underground Utility Conduits: Protecting critical fiber-optic or power cable installations across highly corrosive soil zones.

Rigorous Quality Control & Manufacturing Process

Our 219mm OD pipes undergo a highly automated and controlled manufacturing process to ensure consistent field performance:

Precision Surface Blasting: The bare steel pipe undergoes abrasive shot-blasting to achieve an SA 2.5 cleanliness standard, removing all surface rust and creating a perfect anchor profile.

Dual-Color Polyethylene Extrusion: FBE primer and copolymer adhesive are applied, followed by either yellow or black polyethylene topcoat extrusion. The layer is continuously rolled and cooled to ensure zero voids.

End Beveling & Cutback Machining: High-precision end-facing machines cut the 30°-35° bevels and strip back the 3PE coating at both ends, leaving a consistent 50mm-100mm bare cutback.

Dielectric Integrity Testing: 100% Holiday testing (high-voltage spark testing) is conducted across the entire pipe body to guarantee a 100% pinhole-free and continuous dielectric barrier.

Frequently Asked Questions (FAQ)

Q1: What is the engineering benefit of choosing a Yellow 3PE coating over Black?

A: Yellow 3PE coatings are widely specified for natural gas distribution networks. The bright yellow color acts as a critical visual warning to excavation crews in the future. If a third party digs near the pipeline, the yellow PE is easily spotted, significantly reducing the risk of accidental pipeline strikes. Black remains the standard, highly UV-resistant choice for water and oil pipelines.

Q2: What is the benefit of ordering pre-beveled ends from the factory?

A: Factory-beveled ends save massive labor costs and time on-site. Beveling 219mm pipes in the field is slow and prone to dimensional irregularities. Our factory-machined bevels ensure consistent welding fit-ups, stronger welds, and rapid, seamless pipeline construction.

Q3: How do we protect the bare steel cutback area after field welding?

A: Once the pipeline joints are welded and the weld passes non-destructive testing, the bare steel cutback area is wrapped with a field-applied joint coating, typically a heavy-duty heat shrinkable sleeve (HSS) matched in color (Yellow or Black) to the pipe body.

Q4: Is this 219mm OD pipe available in both Seamless and ERW base pipes?

A: Yes. We can supply the 219.1mm OD pipe using Seamless (SMLS) steel for high-pressure, critical oil/gas lines, or Electric Resistance Welded (ERW) steel for highly cost-effective municipal water and medium-pressure utility projects.