DIN 30670 Standard 3-Layer Polyethylene Coated LSAW Pipe 24 Inch X52

Designed for demanding cross-country energy and large-scale water projects, this 24-Inch 3PE Coated LSAW Pipe combines the exceptional mechanical strength of API 5L X52 grade steel with world-class anti-corrosion technology. Manufactured using the Longitudinal Submerged Arc Welding (LSAW) process, the base pipe provides superior weld integrity and accommodates thicker walls, making it ideal for high-pressure fluid transmission.
The exterior is protected by a premium Three-Layer Polyethylene (3PE) coating system applied strictly in accordance with the German DIN 30670 standard. This sophisticated barrier completely seals the steel substrate from corrosive soils, stray currents, and aggressive chemicals, offering outstanding resistance to cathodic disbondment and mechanical damage. It is the ultimate solution for ensuring long-term pipeline safety and reducing lifecycle maintenance costs in harsh terrestrial environments.

DIN-30670-Standard-3-Layer-Polyethylene-Coated-LSAW-Pipe-24-Inch-X52-1

Features & Advantages

High-Pressure Capability: Unlike standard ERW pipes, the LSAW manufacturing process paired with API 5L X52 high-yield-strength steel ensures the pipeline can safely withstand extreme internal operating pressures.

Strict DIN 30670 Compliance: The 3PE coating is executed to the stringent German DIN 30670 specifications, guaranteeing optimal coating thickness, exceptional adhesion, and maximum defense against impact and soil stress.

Superior Cathodic Disbondment Resistance: The Fusion Bonded Epoxy (FBE) primer chemically bonds to the steel, virtually eliminating the risk of cathodic disbondment even in highly corrosive terrains.

Optimized for Heavy-Duty Infrastructure: The large 24-inch (610mm) outer diameter provides massive flow capacity, making it highly efficient for major oil, natural gas, and regional water transfer networks.

Technical Specifications

Specification Item	Detailed Description
Product Name	3-Layer Polyethylene (3PE) Coated LSAW Steel Pipe
Base Pipe Material	API 5L Grade X52 (PSL1 / PSL2)
Manufacturing Process	LSAW (Longitudinal Submerged Arc Welding)
Nominal Pipe Size (NPS)	24 Inch (DN600)
Outer Diameter (OD)	24.00 inches (609.6 mm)
Wall Thickness (WT)	Typical 0.375" to 1.000" (9.53 mm – 25.4 mm), customizable per project design
Coating Structure	Layer 1: FBE Primer Layer 2: Copolymer Adhesive Layer 3: Polyethylene (PE) Topcoat
Coating Standard	DIN 30670 (German Standard for PE Coatings on Steel Pipes)
Pipe Ends	Beveled ends (30°~35°) with a bare steel cutback length of 50mm-150mm for field welding
Standard Length	11.8m, 12m (Standard for LSAW), or customized lengths

Product Applications

Oil & Gas Transmission: Cross-country mainlines requiring high-pressure tolerance and maximum corrosion protection.

Petrochemical Industry: Transporting refined products, chemical fluids, and hazardous materials safely through underground networks.

Large-Scale Water Infrastructure: Regional water diversion projects, desalination plant distribution, and heavy-duty municipal mains.

Harsh Terrain Installations: Ideal for rocky soils, sub-sea landings, and environments with high risks of mechanical damage during backfilling.

Rigorous Quality Control & Manufacturing Process

Our commitment to quality ensures every 24-inch LSAW pipe meets rigorous global engineering standards prior to dispatch:

LSAW Weld Integrity Testing: Beyond standard visual inspections, 100% Ultrasonic Testing (UT) and X-ray Radiographic Testing (RT) are performed on the longitudinal weld seam to ensure zero internal defects.

Advanced Surface Preparation: The exterior steel surface undergoes abrasive blast cleaning to achieve a near-white metal finish (SA 2.5), establishing the required anchor pattern for the FBE primer.

DIN 30670 Application: The pipe is heated and precisely coated with FBE powder, adhesive, and a durable PE jacket using automated extrusion machinery, ensuring uniform thickness and density.

Final Anti-Corrosion Inspection: Continuous Holiday testing (high-voltage electric spark inspection) is conducted over the entire coated surface to verify a 100% pinhole-free protective layer.

Frequently Asked Questions (FAQ)

Q1: Why choose LSAW instead of ERW for this 24-inch pipe?

A: While ERW is excellent for smaller diameters, the LSAW (Longitudinal Submerged Arc Welding) process is specifically designed for large-diameter (over 18 inches) and heavy-wall pipes. LSAW provides superior weld strength and structural integrity, which is mandatory for high-pressure oil and gas transmission.

Q2: What specific benefits does the DIN 30670 standard offer?

A: DIN 30670 is widely recognized as one of the most rigorous international standards for polyethylene coatings. It mandates strict criteria for coating thickness, impact strength, and adhesion testing. Specifying DIN 30670 ensures the pipeline will reliably withstand severe mechanical handling and long-term soil stress.

Q3: Can the 3PE coating withstand rocky soil conditions during backfilling?

A: Yes. The outermost Polyethylene (PE) layer of the 3PE system acts as a rugged physical armor. It is highly resistant to impact and abrasion, preventing rocky soils or abrasive backfill materials from penetrating and damaging the foundational anti-corrosion FBE layer.

Q4: How is the bare cutback area protected during maritime transport?

A: The bare steel ends (cutbacks) left for on-site butt welding are typically coated with a temporary, weldable rust-preventative varnish or protected with heavy-duty pipe end caps to prevent oxidation during transit and storage.