API 5L PSL1 Grade B Line Pipe 10 Inch Sch 40 ERW for Oil Transportation

Engineered to provide a highly reliable and cost-effective conduit for midstream petroleum infrastructure, this API 5L PSL1 Grade B Line Pipe is optimized for oil transportation and gathering networks. Utilizing a versatile 10-inch nominal pipe size (273.1mm OD) and a robust Schedule 40 (9.27mm WT) Electric Resistance Welded (ERW) steel base, this line pipe offers excellent dimensional uniformity, structural integrity, and ease of field welding.
Manufactured in strict compliance with the API 5L Product Specification Level 1 (PSL1) standard, the Grade B carbon steel delivers dependable low-to-medium pressure fluid containment. It serves as a durable, robust pipeline for conveying crude oil, refined petroleum products, and feeder line networks under standard operating conditions.

Features & Advantages

Cost-Effective ERW Construction: High-frequency induction welding provides precise dimensional tolerances and excellent weld strength, offering an economical alternative to seamless pipes for mid-pressure gathering lines.

Proven Grade B Metallurgy: Grade B carbon steel provides an optimal balance of yield strength (minimum 245 MPa) and superior weldability, facilitating rapid pipeline installation and secure field butt-welding.

Optimal Schedule 40 Dimensions: The 9.27mm wall thickness provides a robust steel body and excellent resistance to internal oil pressures and external soil overburdens.

API 5L PSL1 Certified Quality: Subjected to strict manufacturing controls, including hydrostatic testing and dimensional checks, ensuring a dependable, standardized product for standard pipeline operations.

Technical Specifications

Specification Item	Detailed Description
Product Name	API 5L PSL1 Grade B ERW Line Pipe
Standard Specification	API 5L (Specification for Line Pipe) / GB/T 9711 equivalent
Steel Grade	Grade B (Yield Strength ≥ 245 MPa / 35,500 psi; Tensile Strength ≥ 415 MPa)
Quality Specification Level	PSL1 (Standard Quality Level for general pipeline applications)
Manufacturing Process	ERW (Electric Resistance Welded - High Frequency)
Nominal Pipe Size (NPS)	10 Inch (DN250)
Outer Diameter (OD)	10.750 inches (273.1 mm)
Wall Thickness (WT)	Schedule 40 (0.365 inches / 9.27 mm)
Pipe Ends	Beveled Ends (30°~35°) with factory bare steel cutbacks, or Plain Ends
Surface Finish Options	Bare, Black Vanish Paint, or external anti-corrosion coatings (3PE/FBE)
Standard Length	Single Random Length (SRL - approx. 6m) or Double Random Length (DRL - approx. 12m)

Product Applications

Crude Oil Gathering Systems: Subterranean and overland pipelines connecting oil wells to central processing and storage facilities.

Petroleum Product Feeder Lines: Transporting refined gasoline, diesel, and fuel oils from refineries to distribution terminals.

Low-to-Medium Pressure Flowlines: Safe, localized transport of liquid hydrocarbons within oil and gas fields.

Industrial Oil Utility Piping: Inter-connection piping within petroleum refineries, tank farms, and petrochemical facilities.

Rigorous Quality Control & Manufacturing Process

Our 10-inch ERW line pipes undergo a highly standardized manufacturing and testing process to ensure reliable fluid containment:

Chemical Composition Control: Verifying carbon, manganese, and silicon levels of high-purity hot-rolled steel coils to ensure excellent weldability and consistent mechanical strength.

ERW Roll Forming & Welding: The steel strip is continuously roll-formed into a cylinder and welded along the seam using high-frequency electric induction. Both internal and external weld beads are trimmed flush (scarfed) to ensure a perfectly smooth profile.

Online Weld Seam Heat Treatment: The welded seam area undergoes post-weld heat treatment (seam annealing) to normalize the metallurgical structure, eliminating residual stresses and matching the strength of the parent metal.

Hydrostatic & NDT Verification: Every single pipe length undergoes a mandatory high-pressure hydrostatic test maintained for at least 5 seconds, followed by comprehensive dimensional and visual quality checks before packing.

Frequently Asked Questions (FAQ)

Q1: What is the primary difference between API 5L PSL1 and PSL2 line pipes?

A: PSL1 (Product Specification Level 1) is the standard quality specification for general pipelines, whereas PSL2 imposes much stricter requirements. PSL2 mandates mandatory Charpy V-notch impact testing to ensure fracture toughness, tighter chemical composition limits, and 100% non-destructive testing (NDT) of the weld seam, making it the standard for high-pressure, extreme-environment pipelines.

Q2: Why is ERW steel pipe preferred for 10-inch oil gathering pipelines?

A: ERW (Electric Resistance Welded) steel pipe offers an exceptional balance of precise wall thickness, excellent roundness, and high cost-performance. For low-to-medium pressure oil gathering and feeder networks, ERW provides the necessary structural and pressure-handling capabilities at a significantly lower cost than seamless pipes.

Q3: What are the mechanical yield and tensile limits of Grade B carbon steel?

A: In compliance with API 5L, Grade B line steel possesses a minimum yield strength of 245 MPa (35,500 psi) and a minimum tensile strength of 415 MPa (60,200 psi). This provides highly reliable, uniform load-bearing capacity and pressure ratings suitable for standard industrial fluid transmission.

Q4: Can these 10-inch oil pipes be supplied with anti-corrosion coatings?

A: Yes, absolutely. For buried oil pipelines, external corrosion protection is highly recommended. We can supply these pipes with a standard black protective varnish, or with high-performance multi-layer coatings such as external 3PE (Three-Layer Polyethylene) or FBE (Fusion Bonded Epoxy) to ensure a long, maintenance-free underground service life.