Spiral Steel Pipe for Natural Gas

Oil and Gas Pipeline Spiral Steel Pipe

Petroleum and Natural Gas Industry - Technical Conditions for Delivery of Transportation Steel Pipes - Part B: Grade B Steel Pipes

Double-sided submerged arc-welded spiral steel pipes are a method of welding where the arc is conducted beneath a flux layer. By utilizing the heat generated from the arc burning between the welding wire and flux beneath the flux layer, the wire, flux, and base metal are melted to form the product. The main characteristics of this product are: 1) double-sided submerged arc welding, which not only boasts a high deposition rate but also deep melting capabilities; 2) the arc and welding area are well-protected, resulting in excellent weld quality, good density, and a smooth, glossy weld appearance, meeting various performance requirements for the weld.

Spiral steel pipes for oil and gas transportation

Produced in accordance with the spiral process and the standards of "Petroleum and Natural Gas Industry - Delivery Technical Conditions for Transportation Steel Pipes - Part A: Grade A Steel Pipes" and "Petroleum and Natural Gas Industry - Delivery Technical Conditions for Transportation Steel Pipes - Part B: Grade B Steel Pipes", these pipes are suitable for use in various oil and natural gas transportation projects.

Spiral Steel Pipe for Natural Gas

Standard for spiral steel pipes used in natural gas pipelines is 9711 and API. Ultrasonic testing is required and must be ensured. The steel pipes for export need to be painted and grooved. This facilitates welding connections during construction. The purpose of painting is a simple anti-corrosion procedure.

Spiral Steel Pipe Development Trends for Natural Gas Pipelines

(1) Design and produce new structures of steel pipes, such as double-helix welded pipes, which are made by welding two layers of strip steel with half the thickness of the pipe wall. Not only is the strength higher than that of a single-layer pipe of the same thickness, but it also avoids brittle failure.

(2) Aggressively develop coated pipes, such as applying a corrosion-resistant coating to the inner wall. This not only extends the service life but also improves the smoothness of the inner wall, reduces fluid friction resistance, minimizes wax and dirt buildup, decreases the frequency of pipeline cleaning, and lowers maintenance costs.

(3) Develop new steel grades, enhance smelting technology, and produce high-quality spiral welded pipes with superior welding sections. Widely employ controlled rolling and post-rolling heat treatment processes to continuously improve the strength and toughness, as well as welding properties of the pipes.

(4) Produce large diameter thick-walled pipes to enhance pressure resistance, increasing the main pressure-bearing capacity of spiral-welded pipes.

Natural Gas Pipeline Related Descriptions

Spiral steel pipes for natural gas pipelines can be customized to various lengths as per customer requirements. Pipes requiring special materials typically need to be over 80 tons for processing. Unspecified spiral steel pipes require shaping, with shaping costs varying based on the manufacturer and quantity.