News Detail
ASTM A672 piping is an electric-fusion-welded (EFW) steel pipe manufactured from pressure-vessel-quality plate, designed for high-pressure service in industrial applications. Widely used in LNG facilities, refineries, and petrochemical plants, it is produced by forming steel plate and welding the longitudinal seam, making it highly suitable for large-diameter piping systems.
A key feature of the ASTM A672 specification is its diverse range of grades and classes, which dictate specific heat treatment, testing, and mechanical properties. However, proper material selection is critical. Buyers must carefully evaluate the minimum design temperature and impact toughness requirements. It is important to note that ASTM A672 should not be automatically assumed suitable for direct cryogenic LNG service without verifying the exact grade and class specifications.
Key Properties of ASTM A672 Piping
ASTM A672 piping is designed for demanding industrial applications where high-pressure service, controlled material properties, and reliable welded construction are required. It is manufactured from pressure-vessel-quality plate using an electric-fusion-welding process. Its actual performance depends on the selected grade, class, plate specification, dimensions, heat treatment, and service conditions.
Key Properties
Property | Description | Why It Matters |
|---|---|---|
High-Pressure Service Capability | Suitable for high-pressure service at atmospheric and lower temperatures—refineries, LNG, petrochemical, industrial | Pressure capability depends on grade, diameter, wall thickness, temperature, design code, allowable stress—engineering calculations determine appropriate dimensions |
Lower-Temperature Service | Grades and classes with different requirements for applicable lower-temperature conditions | ASTM A672 designation alone ≠ suitable for direct cryogenic LNG service—verify grade, base plate, impact toughness, minimum design temperature, project requirements |
Electric-Fusion-Welded Construction | Formed from pressure-vessel-quality plate—joined by electric fusion welding—various sizes including larger diameters | Weld quality and inspection critical—NDT and other inspections per class and purchase requirements |
Pressure-Vessel-Quality Plate | Controlled material basis—plate specification affects chemical composition and mechanical properties | Select suitable combination of strength, toughness, temperature performance—specify complete grade and class, not just "ASTM A672 pipe" |
Different Grades & Classes | Multiple grades and classes—different composition, properties, heat treatment, inspection | Select based on pressure, temperature, medium, dimensions, codes—higher strength not always better if additional properties not required |
Testing & Quality Control | Chemical analysis, tensile/mechanical, impact (where specified), hydrostatic, NDT, dimensional, heat-treatment verification, material certification | Confirms supplied pipe meets agreed technical requirements |
Weldability & Fabrication | Welding procedures per selected material and project requirements—preheating, PWHT, other controls may be required | Critical for refinery/LNG projects—depends on grade, thickness, applicable specification |
Important Note for LNG & Refinery Projects
Consideration | Action |
|---|---|
ASTM A672 designation alone ≠ suitable for direct cryogenic LNG service | Verify grade, base plate specification, impact toughness, minimum design temperature, and project requirements |
Material selection must consider complete operating conditions | Carefully verify impact toughness and minimum design temperature—not just the ASTM A672 designation |
Key Takeaway
The key properties of ASTM A672 piping include:
High-pressure service capability – demanding conditions
Lower-temperature suitability – with proper verification
Electric-fusion-welded construction – various sizes
Pressure-vessel-quality plate – controlled material
Different grades & classes – selection flexibility
Specified testing requirements – quality verification
For LNG and refinery projects, material selection must always consider the complete operating conditions, with careful verification of impact toughness and minimum design temperature.
Applications of ASTM A672 Piping in LNG Facilities
Liquefied natural gas (LNG) facilities contain complex piping systems that handle natural gas, LNG, vaporized gas, utilities, and other process fluids. These systems can involve high pressure and a wide range of operating temperatures. ASTM A672 piping can be considered for selected high-pressure applications when the specified grade, class, and material properties meet the project's requirements.
Applications Overview
Application | Typical Use | Key Considerations |
|---|---|---|
High-Pressure Natural Gas Piping | Gas treatment, compression, transmission-related systems—natural gas at significant pressure | Operating temperature/pressure within allowable limits—diameter and wall thickness per engineering calculations and piping code |
LNG Receiving & Regasification Facilities | Associated high-pressure piping in gas-side or auxiliary systems | Operating temperatures may differ from cryogenic LNG—evaluate each section by actual operating and design conditions |
Regasified Natural Gas Systems | High-pressure piping after LNG vaporization—natural gas transport | Grade, class, wall thickness, testing per project specification |
Utility & Auxiliary Piping | Water, steam, compressed gas, firewater, other auxiliary services | Select per requirements of each individual system—where pressure, temperature, properties fall within specification |
Piping Connected to Process Equipment | Compressors, heat exchangers, vaporizers, pressure vessels, pumps—connections between equipment | Pay attention to pressure loads, thermal expansion, welding, material compatibility |
Important Note – Cryogenic Service
Consideration | Action |
|---|---|
ASTM A672 is not automatically appropriate for direct cryogenic LNG service | Verify minimum design temperature, required impact toughness, grade/class, base plate specification, mechanical properties, welding/heat treatment, codes, project requirements |
Direct LNG-contact piping operates at extremely low temperatures | If selected grade does not meet cryogenic properties, another material specification may be necessary |
Key Selection Factors
Factor | Why It Matters |
|---|---|
Pressure | Design and operating |
Temperature | Min and max |
Service medium | Compatibility |
Grade & class | Material properties |
Dimensions | OD and wall thickness |
Welding requirements | Fabrication |
Inspection | Quality verification |
Applicable design codes | Compliance |
Key Takeaway
ASTM A672 can be a useful option for selected high-pressure piping systems associated with LNG facilities, particularly:
Natural gas piping – gas treatment, compression
Receiving & regasification – associated high-pressure systems
Regasified gas lines – post-vaporization transport
Utility & auxiliary piping – supporting systems
Equipment connections – process equipment interfaces
Use in direct cryogenic LNG service requires much more careful verification. Proper material selection helps LNG operators achieve safety, reliability, and cost efficiency while ensuring piping complies with project technical requirements.
Applications of ASTM A672 Piping in Refinery Facilities
Refinery facilities contain complex piping networks that transport crude oil, hydrocarbons, refined products, steam, water, gases, and other process fluids. Many of these systems operate under elevated pressure or demanding temperature conditions. ASTM A672 piping can be used for selected refinery applications when the specified grade, class, dimensions, and material properties meet the project's requirements.
Applications Overview
Application | Typical Use | Key Considerations |
|---|---|---|
High-Pressure Process Piping | Separation, treatment, compression, hydrocarbon processing—high-pressure lines | Material properties suitable for design pressure and temperature—diameter and wall thickness per engineering calculations and piping code |
Hydrocarbon & Gas Piping | Transport between processing units, storage, equipment—high-pressure hydrocarbon/gas | Evaluate medium, temperature, pressure, corrosion, project requirements—ASTM designation alone ≠ suitability |
Piping Around Pressure Equipment | Pressure vessels, heat exchangers, compressors, process units—equipment connection lines | Pressure loads, thermal expansion, welding, dimensions, material compatibility—coordinate with equipment and piping design |
Steam & Utility Systems | Steam, cooling water, compressed gas, firewater, supporting services | Select per individual utility system—operating pressure/temperature within material requirements |
High-Temperature Process Systems | Selected high-temperature piping—elevated temperature operations | Verify allowable properties at intended temperature—consider thermal expansion, welding, heat treatment |
Large-Diameter Industrial Piping | Process, utility, transportation systems—larger diameters | Electric-fusion-welded construction advantageous—grade, wall thickness, pressure rating, temperature, project specification all matter |
Corrosion & Service Conditions | Hydrocarbons, chemicals, moisture, hydrogen-containing streams—aggressive conditions | Review corrosion risks and process chemistry—may require other material, coating, corrosion allowance, additional testing |
Testing & Inspection
Inspection | Purpose |
|---|---|
Chemical composition analysis | Material verification |
Mechanical testing | Strength validation |
Hydrostatic testing | Pressure integrity |
Nondestructive examination | Defect detection |
Dimensional inspection | Size verification |
Impact testing (where specified) | Toughness validation |
Heat-treatment verification | Process confirmation |
Material certification | Compliance documentation |
Key Takeaway
ASTM A672 piping can be considered for:
High-pressure process lines – separation, treatment, compression
Hydrocarbon & gas systems – transport between units
Equipment connections – pressure vessels, heat exchangers, compressors
Utility piping – steam, cooling water, firewater
Selected high-temperature applications – elevated temperature processes
Large-diameter industrial piping – process and utility systems
Suitability depends on actual service conditions and project requirements. Confirm grade/class, dimensions, pressure, temperature, medium, welding, inspection, and applicable piping codes before ordering.
Why Choose ASTM A672 Piping for LNG and Refinery Projects?
LNG terminals, refineries, and petrochemical facilities require piping systems that can handle demanding pressure and temperature conditions. ASTM A672 piping can be a practical choice for selected applications because it is designed for high-pressure service at atmospheric and lower temperatures and is manufactured from pressure-vessel-quality plate using electric-fusion welding.
Key Reasons
Reason | Description | Benefit |
|---|---|---|
Suitable for High-Pressure Applications | High-pressure piping service—gas, process-fluid, utility systems at significant pressures | Pressure capability depends on grade, wall thickness, diameter, temperature, design code—determine through proper design calculations |
Flexible Material Selection | Multiple grades and classes—different chemical composition, mechanical properties, heat treatment, testing | Match pipe to application requirements—not a single material for all systems |
Electric-Fusion-Welded Construction | Various pipe sizes including larger diameters | Efficient option when manufacturing method and quality requirements are satisfied—weld quality and NDT important |
Pressure-Vessel-Quality Plate | Controlled material basis—plate specification affects composition and properties | Confirm complete grade and class—not just general designation |
Testing & Quality Verification | Chemical analysis, mechanical testing, hydrostatic, NDT, impact testing, dimensional, heat-treatment verification | Confirms pipe meets agreed technical specification—supports material traceability |
Selected LNG Applications | High-pressure natural gas, regasification, auxiliary/utility piping where service conditions are appropriate | Direct cryogenic LNG service requires particular attention—do not assume suitability |
Practical Refinery Option | High-pressure process, hydrocarbon, gas, utility, equipment connection piping | Range of grades/classes allows selection based on pressure, temperature, medium, requirements—evaluate corrosion conditions |
Balance Performance & Cost | Balance between technical performance and manufacturing flexibility | Lowest cost ≠ most economical—consider material cost, testing, fabrication, transport, delivery, long-term service |
Important Note – LNG Cryogenic Service
Consideration | Action |
|---|---|
ASTM A672 should not be assumed suitable for cryogenic LNG-contact piping | Verify minimum design temperature, impact toughness, grade, class, applicable codes |
Being used in an LNG facility ≠ automatically suitable for cryogenic service | Careful verification required |
Key Selection Factors
Factor | Why It Matters |
|---|---|
Design pressure | Pressure capacity |
Design temperature | Material performance |
Service medium | Corrosion and compatibility |
Minimum design temperature | Low-temperature suitability |
Grade & class | Material properties |
Dimensions | OD and wall thickness |
Welding requirements | Fabrication |
Inspection requirements | Quality verification |
Applicable project codes | Compliance |
Key Takeaway
ASTM A672 piping can be a suitable choice for selected LNG and refinery applications because of its:
High-pressure service capability
Range of grades and classes
Welded construction
Pressure-vessel-quality plate
Defined testing requirements
The key is proper specification—confirm design pressure, temperature, medium, minimum design temperature, grade, class, dimensions, welding, inspection, and project codes. This ensures reliable performance while avoiding unsuitable material selection and unnecessary costs.
How to Select the Right ASTM A672 Pipe
Selecting the right ASTM A672 pipe requires more than choosing a pipe size or material grade. LNG terminals, refineries, and other industrial facilities can have different pressure, temperature, and service conditions, so the pipe must be selected according to the actual project requirements. A careful selection process helps ensure reliable performance, compliance, and cost control.
Selection Factors
Factor | Key Considerations | Why It Matters |
|---|---|---|
Applicable Standard | Confirm ASTM A672 is correct—identify required grade and class | Grade/class determines material, manufacturing, heat treatment, testing—check project specs and design codes before ordering |
Design Pressure | Design pressure (not just normal operating)—wall thickness depends on diameter, material, temperature, corrosion allowance, design code | Engineering calculations required before final pipe dimensions |
Operating & Minimum Design Temperature | Normal operating + minimum design temperature—verify impact toughness and material properties for low-temp service | Do not assume every ASTM A672 pipe is suitable for direct cryogenic LNG service—if low-temp properties cannot be achieved, another material may be necessary |
Service Medium | Natural gas, hydrocarbons, steam, water, process chemicals—chemical characteristics and corrosion effects | Refinery/petrochemical may require corrosion allowances, coatings, specialized materials, or other protective measures |
Grade & Class | Multiple grades/classes—select combination satisfying chemical composition, mechanical properties, temperature performance, heat treatment, testing | Higher grade ≠ automatically better—unnecessary properties = higher cost without practical benefit |
Pipe Dimensions | OD, wall thickness, length, end configuration, quantity | Large-diameter benefits from EFW availability—final dimensions per engineering requirements |
Welding & Heat Treatment | Welded pipe—welding procedure, thickness, heat treatment, post-weld treatment | Define welding and inspection requirements clearly in purchase specification for critical refinery/LNG applications |
Testing & Inspection | Chemical analysis, tensile/mechanical, hydrostatic, impact, NDT, dimensional, heat-treatment verification, MTC, third-party | Clear requirements ensure delivered pipe meets project technical expectations |
Supplier Capability & Delivery | Grade, class, dimensions, testing, documentation, delivery schedule—packaging, loading, destination, Incoterms, freight, lead time | Provide complete information—not just pipe diameter and quantity |
Quick Selection Checklist
Item | Check |
|---|---|
Standard | ASTM A672 |
Grade & class | Material properties |
Design pressure | Engineering calculations |
Operating temperature | Normal range |
Minimum design temperature | Low-temp suitability |
Service medium | Corrosion and compatibility |
Dimensions | OD, wall thickness, length |
Welding | Procedures and heat treatment |
Testing | Chemical, mechanical, hydrostatic, NDT |
Supplier | Capability and delivery |
Our ASTM A672 Piping Products and Shipping Services
We supply premium ASTM A672 electric-fusion-welded steel pipes, specifically engineered for high-pressure industrial applications in LNG terminals, refineries, and petrochemical plants. We customize our carbon and alloy steel pipes to your exact grade, class, and dimensional requirements.
Quality and compliance are paramount. We conduct rigorous inspections—including hydrostatic testing, NDT, and impact testing—and provide comprehensive material certificates to guarantee full adherence to ASTM A672 standards.
Beyond manufacturing, we provide end-to-end global shipping solutions. We understand that timely delivery is critical to maintaining project schedules. Our logistics team manages secure packaging and flexible transportation options (container and break-bulk freight) to prevent transit damage and ensure your pipes arrive safely and on time.
From technical consultation to final delivery, we provide a complete, reliable supply chain. To receive a customized product and shipping quotation, please contact us today with your required A672 grade, dimensions, testing requirements, quantity, and delivery destination. Our expert team will recommend the optimal industrial piping configuration tailored to your exact needs.
Conclusion
ASTM A672 piping is an electric-fusion-welded steel pipe manufactured from pressure-vessel-quality plate, ideal for high-pressure industrial applications in LNG terminals, refineries, and petrochemical plants.
Selecting the correct grade and class is critical for ensuring structural integrity under specific pressure and temperature conditions. Crucially, buyers must verify impact toughness and minimum design temperatures, as standard ASTM A672 may not be suitable for direct cryogenic LNG service without proper specification.
FAQ：
FAQ 1: What is ASTM A672 pipe used for?
ASTM A672 pipe is used for high-pressure piping at atmospheric and lower temperatures, including selected applications in LNG terminals, refineries, petrochemical plants, and industrial facilities.
FAQ 2: Is ASTM A672 suitable for LNG service?
Selected ASTM A672 grades may be suitable for certain LNG-related systems. However, direct cryogenic LNG service requires careful verification of the grade, impact toughness, minimum design temperature, and project requirements.
FAQ 3: Is ASTM A672 pipe welded or seamless?
ASTM A672 covers electric-fusion-welded steel pipe manufactured from pressure-vessel-quality plate.
FAQ 4: What factors should be considered when selecting ASTM A672 pipe?
Consider the required grade and class, design pressure, operating and minimum temperatures, service medium, pipe dimensions, welding requirements, testing, applicable codes, and delivery conditions.
FAQ 5: What tests are required for ASTM A672 pipe?
Depending on the grade, class, and purchase specification, testing may include chemical analysis, mechanical testing, hydrostatic testing, impact testing, nondestructive examination, dimensional inspection, and heat-treatment verification.
