API 5L PSL2 and sour-service line pipe are related, but they are not interchangeable terms. PSL2 is a product specification level within API Specification 5L. Sour-service pipe adds requirements intended for line pipe exposed to H₂S-containing environments when the applicable project and material-selection rules require sour-service qualification. API published the 47th Edition of API Spec 5L in June 2026, with updates that include sour-service requirements, chemical element ranges, HFW quality, impact toughness and sulfide stress cracking testing. Understanding API 5L…

API Specification 5L covers steel line pipe used in pipeline transportation systems. Commonly specified grades include Grade B and X-grades such as X42, X52, X56, X60, X65, X70 and X80. The X-number is associated with the grade's specified minimum yield strength in ksi, but grade selection should never be based on strength alone. API published API Spec 5L, 47th Edition, in June 2026. ISO 3183:2019, Edition 4, remains current after review and confirmation in 2026; ISO states that this edition…

ERW and EFW describe different welded-pipe manufacturing concepts. ERW/HFW pipe forms strip or coil into a pipe and joins the longitudinal edges by resistance/high-frequency welding and forge pressure without conventional filler metal. Electric-fusion-welded (EFW) pipe uses a fusion-welding process with added filler metal. Longitudinal submerged-arc welded (LSAW) pipe is a common plate-based longitudinal fusion-welded route, but the terms EFW and LSAW should not be treated as universal synonyms. ERW/HFW Pipe: Coil-Fed Resistance Welding In ERW/HFW production, strip or coil is…

API 5L pipe can be purchased from manufacturers, stockists, distributors, trading companies and integrated service suppliers. These supplier types do not provide the same level of manufacturing control, inventory availability, customization or documentation support. For buyers, the right choice depends on the project specification, order size, schedule, required manufacturing route and inspection requirements. What Is an API 5L Pipe Supplier? API Specification 5L covers seamless and welded steel line pipe for pipeline transportation systems in the petroleum and natural gas…

API 5L Grade X65 line pipe can be specified for pipelines where hydrogen sulfide (H2S) creates a sour-service risk, but sour-service compliance cannot be established from grade designation alone. The purchase specification must define the applicable API 5L product specification level, sour-service requirements, service conditions, testing and documentation. API published the 47th Edition of API Specification 5L in June 2026, and this edition includes updates to sour-service requirements, chemical element ranges, HFW pipe quality, impact toughness and sulfide stress cracking…

Yes. Steel piles, including circular steel pipe piles, are widely used as deep foundation elements. They transfer structural loads to deeper soil or rock through shaft resistance, end bearing, or a combination of both. This makes steel pipe piles suitable for many bridges, marine structures, industrial facilities and other projects where near-surface soils cannot provide the required foundation performance. Understanding Steel Piles as Deep Foundations Deep Foundations vs. Shallow Foundations The distinction between shallow and deep foundations should not be…

The most reliable way to distinguish seamless (SMLS) pipe from electric resistance welded/high-frequency welded (ERW/HFW) pipe is to combine physical inspection with product marking and mill documentation. A longitudinal weld indication can suggest ERW/HFW manufacture, but visual appearance alone is not always conclusive because modern weld seams may be trimmed, heat treated and covered by coating. How Seamless and ERW Pipes Are Manufactured Seamless Pipe Seamless pipe is produced from solid steel starting material that is pierced and rolled or…

For a steel pipe pile foundation, the basic quantity calculation starts with outside diameter (OD), nominal wall thickness (t), pile length (L) and number of piles (N). The most useful purchasing calculation is the theoretical mass per meter of a circular steel pipe, followed by the total ordered length. Any allowance for cutting, splicing or contingency should be project-specific rather than treated as a universal percentage. ASTM A252/A252M Steel Pipe Piles ASTM A252/A252M-26 covers nominal-wall cylindrical steel pipe piles used…

Yes. ERW (electric resistance welded) steel pipe can be welded during fabrication or field installation when the material, joint design, welding procedure and inspection requirements are suitable for the project. The key is not simply whether the pipe already contains a longitudinal ERW seam, but whether the girth weld or attachment weld is made under a qualified procedure appropriate to the pipe grade, wall thickness, chemistry and service conditions. ERW Pipe Weldability How ERW Pipe Is Made—and Why It Matters…

API 5L Grade B, also designated L245, is one of the most widely specified line-pipe grades for oil, gas, water and related pipeline transportation systems. Its popularity comes from a practical balance of strength, weldability and availability. However, a correct purchase order requires more than the words “API 5L Grade B.” Buyers also need to define the Product Specification Level (PSL), dimensions, manufacturing route, delivery condition, inspection requirements, coating and certification. API published the 47th Edition of API Specification 5L…

API 5L Grade B pipe, also designated L245, is widely considered for oil and gas transportation systems where its specified strength, dimensions and service requirements fit the design. With a specified minimum yield strength of 245 MPa and minimum tensile strength of 415 MPa, Grade B can provide a practical balance between material performance, weldability and project cost. It does not, however, have a universal pressure rating or automatic suitability for sour, offshore or low-temperature service. API published the 47th…

API 5L line pipe is widely used for crude oil, natural gas and other energy-transportation pipelines because it provides a common manufacturing specification for seamless and welded steel line pipe. For an oil transmission project, however, selecting “API 5L” is only the starting point. Grade, PSL, wall thickness, manufacturing route, toughness, corrosion protection, inspection and documentation must all be matched to the design basis. API published the 47th Edition of API Specification 5L in June 2026. The edition includes updates…

Customized structural hollow sections are selected primarily by cross-sectional geometry, load path, connection design, manufacturing route, and the governing structural standard. Under EN 10219, the most familiar profiles are Circular Hollow Sections (CHS), Square Hollow Sections (SHS), and Rectangular Hollow Sections (RHS); EN 10219-2:2019 also covers elliptical hollow sections. Each geometry behaves differently under bending, compression, torsion, and connection loading, so “customized hollow section” should describe an engineering choice rather than simply a non-standard size. For LONGMA customers, one product…

Fusion-bonded epoxy (FBE) coating is widely used to protect steel pipe from external corrosion in buried or submerged service. For procurement teams, however, specifying an FBE-coated pipe is only the first step. The coating must also be inspected and tested under a documented inspection and test plan (ITP) to verify thickness, continuity, adhesion, cure, and resistance to cathodic disbondment. A coating that looks uniform can still contain holidays, local under-cure, poor surface preparation, or adhesion defects that may shorten field…

Bending galvanized steel pipe properly is a skill that directly impacts pipe integrity, coating longevity, and long-term project performance. Galvanized steel pipes are carbon steel pipes that have been coated with a protective coating of zinc by hot-dip galvanizing. The pipes are usually made to ASTM A53 requirements. Zinc coating offers a barrier and cathodic protection. Incorrect bending techniques may cause cracking or delamination of the zinc coating, which can lead to rapid corrosion of the steel substrate. This handbook leads…