56 Inch API SPEC 5L PSL1 PSL2 LSAW Steel Pipe For Gas Pipeline

56 Inch API SPEC 5L PSL1 PSL2 LSAW Steel Pipe For Gas Pipeline

API SPEC 5L PSL1,PSL2 LSAW Steel Pipe Used For Conveying Gas, Water And Oil

LSAW steel pipe, say, longitudinal submerged arc welding pipe, is using double-sided submerged arc welding process, welding in static conditions, thus can get high weld quality, short weld seam, low probability of potential defects. Expanding diameter through whole length. Appearance well, size precision, wide range of steel tube wall thickness and pipe diameter , range of diameter up to 457.2-1422.4 mm diameter, wall thickness 9.5-27 mm, higher degree of automation, compared with seamless steel tube, the production cost is lower, suitable for upright load bearing, large span construction structure and wind and earthquake resistant electricity tower mast structure of buildings, Bridges, DAMS, offshore platform etc.

The pipeline corrosion mechanism and causes

1. The chemical corrosion

Chemical etching is refers to the metal surface and the dielectric damage caused by the pure chemical action between directly. Its characteristic is under certain conditions, the electrolyte of oxidizer and metal atoms interact with each other and form on the surface of the corrosion products, corrosion in the process of electronic passed directly between the metal and oxidant, no current is generated. Usually not metal at room temperature and dry air corrosion, it is easy to oxidation at high temperature, generating a layer of oxide film (Fe0, Fe203, Fe304), the decarburization phenomenon will happen at the same time.

2. The electrochemical corrosion

Electrochemical corrosion is refers to the metal surface and the ion conductive medium damage as a result of the electrochemical action, its characteristic is that electrochemical corrosion process can be divided intoTwo relatively independent and can simultaneously process. In the pipeline corrosion electrochemical corrosion is the most common, the most common.

3, The bacteria corrosion

When containing sulfate in the soil under the condition of oxygen sulfate-reducing bacteria RB) will quickly move, they take advantage of organic matter on the surface of the metal as a carbon source, and USES of the formation of hydrogen in the bacterial biofilm and sulfate-reducing into sulfide, survive the energy from the REDOX reaction. Not only can promote the anode of sulfate reducing bacteria metabolites depolarization effect, make the corrosion, and its potential is lower than iron, and form a new corrosion cell.

1. Out diameter: 457.2mm - 1422.4mm (18"-56")

2. Thickness: 9.5mm-27mm

3. Length: 6m-12.5m

4. Type: LSAW (Longitudinal Submerged-Arc Welded), DSAW (Double Submerged-arc welded) Steel Pipe

5. Manufacturing Process: UO(UOE), RB(RBE), JCO(JCOE,COE)

6. Standard: API SPEC 5L (ISO 3183), GB/T 9711.1, GB/T 9711.2, GB/T 9711.3

7. Uses: for conveying gas, water and oil, in the oil or natural gas industries

8. Chemical Analysis (%):

1.Chemical composition in % For API 5L PSL1

2.Mechanical Properties for API 5L PSL1

3.Chemical composition in % For API 5L PSL2

4.Mechanical Properties For API 5L PSL2