Carbon steel pipes are commonly classified by how they are manufactured: seamless pipe has no longitudinal weld, while welded pipe is formed from steel strip or plate and joined along a seam. Major welded types include electric resistance welded (ERW), longitudinal submerged arc welded (LSAW) and spiral submerged arc welded (SSAW) pipe. Each can be supplied to suitable product standards and dimensions. A pipe may also be described by its grade, application or surface treatment. For example, galvanized pipe has…

FBE coated steel pipe is carbon or alloy steel pipe protected by a heat-cured fusion bonded epoxy layer that resists moisture, soil chemicals, and oxygen exposure. This guide explains how the coating works, how it compares with 3LPE and galvanized options, and what buyers should specify before placing an order. You will find standards references, a project case study, pricing factors, and a quality checklist built for procurement teams managing pipeline, water, and heating projects across the Middle East, Southeast…

Choosing the right external coating for an offshore pipeline is an important decision for EPC procurement teams and operators. FBE forms a thin, bonded corrosion barrier; 3LPE adds an adhesive and polyethylene outer layer; 3LPP uses polypropylene for applications requiring suitable higher-temperature performance. None is automatically best for every water depth or installation method. Selection depends on the qualified system, operating temperature, installation loads, cathodic-protection design and project budget. Offshore Pipeline Coatings: FBE, 3LPE, and 3LPP What Is FBE Coating?…

Electric fusion welded steel pipe does not need heat treatment in every case. Whether treatment applies depends on the ASTM class, steel grade, wall thickness, and the pressure and temperature conditions written into your purchase specification. Some classes under ASTM A671 allow pipe to ship in the as-welded condition, while others require stress relieving or normalizing to reach the toughness and hardness values a project demands. This guide walks through when heat treatment applies to electric fusion welded steel pipe,…

ASTM A53 Schedule 40 ERW pipe has different nominal wall thicknesses for different nominal pipe sizes. Within NPS 1/8 through NPS 16, representative Schedule 40 walls range from 0.068 in. [1.73 mm] to 0.500 in. [12.70 mm]; this is a selected size range rather than the complete dimensional series. For NPS 2 through NPS 8, the nominal walls range from 0.154 in. [3.91 mm] to 0.322 in. [8.18 mm]. Check the applicable dimensional table and A53 wall-thickness tolerance for the…

ASTM A53 Grade B pipe does not have a universal numerical surface roughness limit. Black ERW pipe may show Ra values around 6.3–25 µm in mill practice, while galvanized surfaces may show values around 10–30 µm, depending on manufacture and coating condition. These are indicative observations rather than ASTM acceptance limits. Buyers requiring a particular finish should specify whether the requirement applies to the internal surface, external surface or weld area, together with the measurement method and acceptance criteria. ASTM…

ASTM A53 Schedule 40 ERW pipe is electric-resistance-welded carbon-steel pipe identified as Type E under ASTM A53/A53M. It is used for suitable mechanical and pressure applications, including water, air, steam, gas utilities, fire protection and structural support where permitted by the project specification. Schedule 40 is a dimensional series used with nominal pipe size: for example, NPS 2 has a nominal wall of 0.154 in. [3.91 mm]. Welding, bending and flanging suitability must be assessed under the applicable product and…

Coatings for API 5L X52 (L360) ERW steel pipes protect the steel surface against the conditions encountered during storage, installation and operation. FBE and three-layer polyethylene are established options for suitable buried or submerged pipelines, while black varnish generally provides temporary protection during transport and storage. Selecting a coating involves operating temperature, soil or water exposure, installation loads and the corrosion-control design. The steel grade and manufacturing process remain separate parts of the pipe specification. Understanding Coating Systems for X52…

ASTM A53 Grade B and ASTM A106 Grade B are carbon-steel pipe specifications with similar minimum strength requirements but different scopes and manufacturing provisions. A53 covers black and hot-dip galvanized pipe for mechanical and pressure applications and ordinary uses in steam, water, gas and air lines. A106 covers seamless carbon-steel pipe for high-temperature service. Procurement teams should compare the product requirements against the design specification before accepting either material or a proposed substitution. Understanding the Two Specifications Why Similar Strength…

High performance in API 5L X52 (L360) ERW steel pipe means that material properties, weld quality, dimensions and inspection records meet the requirements of the intended project. Using the API 5L 46th-edition metric framework, X52 has a specified minimum yield strength of 360 MPa and minimum tensile strength of 460 MPa. These material values support engineering design, while the pipe's dimensions, service environment and governing code determine its actual suitability. Material Properties and Specifications Chemistry and Field Weldability Chemical composition…

Choosing between LSAW, SSAW and ERW pipe requires an assessment of dimensions, material properties, weld inspection and the service environment. These processes produce different seam configurations and offer different manufacturing advantages. Compliance with API 5L or ISO 3183 depends on the ordered grade, PSL, edition and supplementary requirements. LONGMA manufactures round ERW and LSAW pipes; SSAW is included here as an industry comparison to help procurement teams evaluate alternatives. Understanding LSAW, SSAW, and ERW Steel Pipes API 5L was updated…

Sourcing high-quality API 5L X52 PSL1 LSAW line pipe begins with a clear purchase specification and a manufacturer capable of meeting it. X52 identifies a specified minimum yield strength of 360 MPa and minimum tensile strength of 460 MPa under the commonly used API 5L 46th-edition framework. PSL1 establishes product requirements, including applicable weld inspection; it is not simply a low-pressure classification. Procurement teams should confirm dimensions, service conditions, inspection and documentation before comparing offers. Understanding API 5L X52 PSL1…

The ERW steel pipe manufacturing process transforms steel coil into welded round pipe through forming, electrical resistance heating and pressure welding. Modern high-frequency welding joins the strip edges without filler metal. Weld treatment, dimensional control and inspection then establish whether the product meets the ordered specification. ERW pipe can be manufactured to API 5L, ASTM A53 or other applicable standards for oil, gas, water and structural applications; compliance with each standard must be specified and verified separately. Understanding the ERW…