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What is EN 10219 Standard?
ASTM A671 LSAW Pipe is a longitudinal submerged arc welded steel pipe manufactured according to ASTM A671 specification for low-temperature and pressure service applications. It is commonly used in pressure vessels, cryogenic facilities, power plants, and industrial piping systems where high weld reliability and mechanical performance are required.
Compared with standard pipeline pipes, ASTM A671 LSAW Pipe focuses more on pressure containment, low-temperature toughness, and welding quality control rather than long-distance oil and gas transmission.
Why Choose ASTM A671 LSAW Pipe?
1. Excellent Low Temperature Performance
ASTM A671 LSAW Pipe is mainly selected for applications where pipes must maintain mechanical properties under low-temperature conditions.
Key requirements include:
- Impact toughness at specified temperatures
- Stable steel structure
- Resistance to brittle fracture
It is suitable for:
- Cryogenic plants
- LNG-related facilities
- Cold climate industrial projects
- Low-temperature pressure systems
2. High Pressure Resistance
Because ASTM A671 pipes are manufactured from pressure vessel grade steel plates, they provide reliable performance under internal pressure.
Main advantages:
- High yield strength
- Uniform wall thickness
- Strong weld integrity
- Good pressure containment capability
3. Reliable LSAW Welding Quality
The longitudinal submerged arc welding process is suitable for large diameter and heavy wall thickness pipes.
Advantages include:
- Deep weld penetration
- Smooth weld appearance
- Reduced welding defects
- Easy inspection and quality control
Main Application Fields For ASTM A671 Lsaw Steel Pipe
1. LNG & Cryogenic Gas Facilities: LNG boil-off gas (BOG) recovery pipeline, LPG transfer piping, air separation unit lines for liquid nitrogen & liquid oxygen, ethylene cryogenic transmission lines. It is widely used in LNG receiving terminals and cryogenic process plants.
2. Petrochemical & Refinery Low-temperature Process Piping: Low & medium pressure process piping inside refineries and petrochemical plants. Suitable for outdoor pipe racks in cold regions, where temperature drops sharply in winter.
3. Cold Climate Onshore Oil & Gas Gathering Systems: Oil and gas gathering and transmission pipelines in arctic / sub-zero areas. Used for onshore oil & gas processing module piping, FPSO topside utility lines.
4. Power Plant Pressure Auxiliary Piping: Power plant boiler feedwater pipeline, condenser & cooling water large-bore pressure piping, utility compressed air piping for power station.
5. Cold-region Industrial Fluid & Water Transmission: Large diameter pressure water transmission pipeline for industrial plants and cold-area municipal water supply. Also for wastewater pressure conveyance in low-temperature zones.
6. Chemical Plant Medium Pressure Utility Piping: Process and utility pressure lines for chemical factories, fertilizer plants, suitable for cyclic pressure and temperature fluctuation.
ASTM A671 LSAW Pipe Testing Requirements
1. Hydrostatic Test
Used to verify:
- Pressure resistance
- Pipe body integrity
- Weld reliability
2. Non-Destructive Testing (NDT)
Common inspections:
- Ultrasonic Testing (UT)
- Radiographic Testing (RT)
- Magnetic Particle Testing (MT)
These tests help detect:
- Internal weld defects
- Surface cracks
- Lack of fusion
3. Mechanical Testing
- Tensile test
- Impact test
- Bend test
- These tests confirm mechanical performance under service conditions.
ASTM A671 LSAW Pipe vs API 5L LSAW Pipe
| Item | ASTM A671 LSAW Pipe | API 5L LSAW Pipe |
|---|---|---|
| Main Purpose | Pressure vessel and low temperature service | Oil & gas transmission |
| Standard Focus | Pressure performance | Pipeline transportation |
| Raw Material | Pressure vessel steel plate | Pipeline steel plate |
| Key Requirement | Low temperature toughness | Line pipe strength |
| Typical Application | LNG, power plant, industrial systems | Oil, gas, water pipelines |
FAQ
Q: What is EFW electric fusion welding?
A: EFW (Electric Fusion Welded) is arc fusion welding with filler metal. In ASTM A671 specification, EFW pipe normally refers to LSAW longitudinal submerged arc welded pipe, suitable for low-temperature pressure piping service.
Q: What is the difference between EFW and ERW pipe?
A: EFW uses arc melting plus filler wire, weld can be heat treated for low temperature toughness. ERW pipe is resistance forge welding with no filler metal, only fit general low-pressure service.
Q: Is your ASTM A671 LSAW pipe EFW pipe?
A: Yes. Our LSAW longitudinal submerged arc welded pipe complies with the EFW requirement of ASTM A671 / A671M.
Q: Is ASTM A671 suitable for oil and gas pipelines?
A: ASTM A671 can be used in some pressure-related oil and gas facilities, but long-distance transmission pipelines normally follow API 5L specifications.
Related: LSAW Pipe , LSAW Pipe for ASTM A671 / A671M
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