ISO 21809-1 3-Layer Polypropylene (3LPP) Coated Line Pipe

ISO 21809-1 3-Layer Polypropylene (3LPP) Coated Line Pipe

Our ISO 21809-1 3-layer polypropylene (3LPP) coated line pipe is designed to meet the demanding requirements of the international standard ISO 21809-1 for coatings for pipes and fittings for pipelines in petroleum and natural gas industries. The 3LPP coating consists of three layers: an inner layer of fusion bonded epoxy, a middle layer of adhesive, and an outer layer of polypropylene. This unique three-layer structure provides excellent protection against corrosion, abrasion, and chemical damage. The coating also exhibits high flexibility, making it suitable for use in a wide range of pipeline applications, including those with complex bends and curves. Our ISO 21809-1 3LPP coated line pipe is widely used in the transportation of oil, gas, and petrochemical products, as well as in offshore platforms and land-based infrastructure projects. With its excellent performance characteristics, our 3LPP coated line pipe ensures reliable operation, reduced maintenance costs, and extended lifespan of the pipeline system.

Specifications

Standard	ISO 21809-1 3-Layer Polypropylene (3LPP) Coated Line Pipe
Applied Steel Service Pipe	API 5L/ISO 3183 Gr.B-X100, ASTM A53/A106 Gr.B, ASTM A333 Gr.1/3/6, ASTM A671/A672/A691
Processing ability	OD:38mm-1620mm; WT:2mm-30mm
Length	6-18m
Surface Preparation	ISO 8501-1/SIS 055900/DIN 55928 Sa 2.5/NACE No.2/SPCC SP10 (Near White Metal Finish)
Coating Structure	First Layer: Epoxy Primer Layer; Second Layer: Adhesive Layer; Third Layer: High-density Polypropylene Layer
Packing	1. Both ends of the pipe are beveled to 30°+5°/-0° according to ASME B16.25. 2. For large-diameter pipes (OD≥NPS 8″), each pipe is equipped with 3 anti-collision ropes (3 locations) and 2 slings, with plastic covers at the ends of the pipes, or reusable metal bevel protectors (with sealing cloth), loosely packed. 3. For small-diameter pipes (OD≤NPS 6″), each pipe is equipped with 3 anti-collision ropes (3 locations), plastic covers at the ends of the pipes, and 2 slings per bundle (the whole bundle can be wrapped in a woven bag according to the coating type or customer requirements) and tied with plastic strips (woven bags are placed underneath to protect the coating from scratches)
Technique	Coated on Seamless/ERW/HFW/LSAW/SSAW/JCOE/UOE/RBE Line Pipes
Service condition	Design working temperature ranges: -40℃ to +120℃; alkaline or sour service
Place of Origin	Made in China
MOQ	Depends on order quantity
Transportation	Railway, By Sea

Coating Classes and Design Temperature Ranges

Coating Class	Top Layer Material	-40°C	-20°C	0°C	+20°C	+40°C	+60°C	+80°C	+100°C	+120°C
A	LDPE			X	X	X	X
B	MDPE, HDPE		X	X	X	X	X	X
C*	PP					X	X	X	X	X
* Installation and transportation at temperatures below 0°C can cause mechanical damage.

Minimum Total Coating Thickness

Pm​ (kg/m)	Class A1	Class A2	Class A3	Class B1	Class B2	Class B3	Class C1	Class C2	Class C3
Pm​≤15	1.8	2.1	2.6	1.3	1.8	2.3	1.3	1.7	2.1
15＜Pm≤50	2	2.4	3	1.5	2.1	2.7	1.5	1.9	2.4
50＜Pm≤130	2.4	2.8	3.5	1.8	2.5	3.1	1.8	2.3	2.8
130＜Pm≤300	2.6	3.2	3.9	2.2	2.8	3.5	2.2	2.5	3.2
Pm＞300	3.2	3.8	4.7	2.5	3.3	4.2	2.5	3	3.8

Coating Performance

Essential characteristic	Performance								Technical specification
Total coating thickness	Pm	Unit	Values						ISO 21809-1:2018
			Class A			Class B
			A1	A2	A3	B1	B2	B3
	Pm​≤15	Kg/m	1.8	2.1	2.6	1.3	1.8	2.3
	15＜Pm≤50		2	2.4	3	1.5	2.1	2.7
	50＜Pm≤130		2.4	2.8	3.5	1.8	2.5	3.1
	130＜Pm≤300		2.6	3.2	3.9	2.2	2.8	3.5
	Pm＞300		3.2	3.8	4.7	2.5	3.3	4.2
	Temperature	Unit	Cl.ass A			Class B
Strainin brake	at 23°C±3°C	%	400			400
Stress at yield	at 23°C±3°C	MPa	10,0			15,0
Continuity	–	–	Free of defects and discontinuities, delaminations, separations and holidays
Indentation	at 23°C±3°C	mm	≤0,3			≤0,2
	at maximum design temperature		≤0,4			≤0,4
Impact strength	at 23°C±3°C	J/mm	>5			>7
Peel strength	at 23°C	N/mm	≥10			≥18
	at 60°C		≥2.0			–
	at 80°C		–			≥5.0
△Tg	–	℃	-3,0℃≤ △Tg≤+3,0°C
Product stability during appl. of the PE top layer process	–	%	△MFR≤20
Cathodic disbondment	at 23°C/28d; -1.38V	mm	≤5,0
	at 65°C/28d; -1.38V		≤4,0
Flexibility	–	Degrees per pipe length diameter	No cracking at an angle of 2,0° per pipe diameter length
Resistance to hot water	–	mm	Average≤2,0 and maximum≤3,0
UV resistance	–	%	△MFR≤35			△MFR≤35
Apparent density of PE coating	–	g/cm’	≥0.930			≥0.940

3LPE Coating Production Process

Applications of ISO 21809-1 3-Layer Polypropylene (3LPP) Coated Line Pipe

ISO 21809-1 specifies requirements for three-layer polypropylene (3LPP) coated steel line pipes, which provide excellent corrosion protection and mechanical resistance. The 3LPP coating is particularly suited for environments with high mechanical stress and elevated temperatures.

Oil and Gas Industry:
Transmission Pipelines: Transporting crude oil, natural gas, and refined petroleum products over long distances from production sites to refineries and distribution centers.
Subsea Pipelines: Underwater pipelines for offshore oil and gas exploration and production, offering superior resistance to high pressure and temperature.
Flowlines and Risers: Used in offshore platforms to transport oil and gas from the seabed to the surface facilities.

High-Temperature Environments:
Steam Injection Lines: Pipelines used in enhanced oil recovery methods, such as steam injection, where temperatures are significantly higher.
Hot Water Pipelines: Transporting hot water for industrial processes or district heating systems.

Water Supply Systems:
Potable Water Pipelines: Distribution of drinking water from treatment plants to consumers, particularly in areas with aggressive soil conditions.
Irrigation Pipelines: Transporting water for agricultural purposes, especially in regions with high ambient temperatures.

Industrial Applications:
Chemical and Petrochemical Plants: Conveyance of chemicals, petrochemicals, and other industrial fluids, where high temperature and mechanical resistance are critical.
Slurry Pipelines: Transport of abrasive materials like mining slurries, providing resistance to abrasion and chemical attack.

Infrastructure Projects:
Urban and Rural Infrastructure: Pipes used in municipal water supply and sewage systems, offer long-term durability in aggressive environments.
Power Plants: Pipelines for cooling water and other utilities, particularly in high-temperature areas.

Marine and Coastal Environments:
Harbor and Dock Installations: Pipelines exposed to seawater and harsh coastal conditions, providing enhanced protection against corrosion and mechanical damage.
Desalination Plants: Conveyance of seawater to and from desalination facilities, where high resistance to saline environments is required.

Storage Facilities:
Tank Farms: Pipelines connecting storage tanks for various liquids and gases, withstanding high mechanical stress and temperature fluctuations.