Welding oil pipe
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Welding oil pipe, used for transportation of petroleum products is a common and very important operation. The quality of welding depends on the security operation and the efficiency of the pumping of oil, particularly in areas with difficult climatic conditions.
Regulations and rules are welding oil pipes are regulated by RD 153−006−02, and define:
- Rules and sequence of certification of all welding processes;
- Requirements for oil pipelines and pipeline valves;
- The requirements for consumables;
- Requirements for welding equipment.
In the RD 153−006−02 also establishes methods for testing of welded oil pipes, and sections of them. The article also considers the issues of butt welding of pipes of large and small diameters for replacement and repair, both in the main and service pipelines.
The oil pipes can be connected using the following welding technologies:
Manual arc welding with coated electrodes;
Semi-automatic welding in carbon dioxide environment with a solid section wire method (STT);
Semiautomatic welding self-shielded flux-cored wire;
Automatic submerged arc welding;
Automatic welding in protective gas with solid section wire with the use of complexes of the CRC — Evans AW (all layers of the weld head P-200;
Automatic welding in shielding gases using complexes CWS .02;
Automatic welding in protective gas with solid section wire using heads P-200 (method STT for the root layer of the seam);
Automatic welding in protective gas with solid section wire using heads М220 and M300 (method STT for the root of the weld);
Automatic welding in shielding gases flux cored wire using the heads М220 and M300;
Manual argon-arc welding with non-consumable electrode (the root of the weld joints of pipes of small diameter and all layers of the weld joints of thin-walled tubes).
To buy at cost-effective prices from the manufacturer rolled oil pipes, the company offers Electrocentury-steel. The supplier ensures prompt delivery of goods to the point specified by the customer.
Peculiarities of technology of welding and quality assurance
For welding oil pipes allowed the products to be supplied according to the technical standards GOST R 51−31323949−58−2000. Each batch of tubes must be certified by the manufacturer indicating regulated by the standard or specifications acceptance specifications. In particular, classes, and strength and mechanical properties of pipes from carbon and low alloy steels according to GOST 20295−85 must be within the range specified in the table below:
|Strength class||Mechanical properties (min)|
|Rupture strength, MPa||Yield strength, MPa||Elongation, %|
As materials for welding oil pipes are applied:
electrodes with basic and cellulose coatings for manual arc welding;
fused and agglomerated fluxes for automatic welding of rotary joints;
welding wire of solid section for automatic and semi-automatic welding in shielding gases and automatic submerged arc welding;
flux-cored wire for semi-automatic welding with a continuous weld;
flux-cored wire for automatic welding in shielding gases;
shielding gases — argon gas, carbon dioxide gas and a mixture thereof, for automatic and semi-automatic welding of fixed and rotary joints of pipes.
Before welding the ends of the oil pipes in most cases are heated to set temperatures. Manual arc welding is performed in the following ways:
the root layer and all subsequent layers of the seam is performed by electrodes with the basic type of coverage;
the root weld layer and hot pass is performed by electrodes with cellulose coating, subsequent layers of electrodes with main type of coating;
all layers of the weld electrodes with cellulose coating.
RD 153−006−02 also determines the technology of semi-automatic and automatic (submerged arc welding) welding of oil pipes, as well as technology testing of welded sections of the pipeline.
Buy the oil pipe of any diameter and lengths at cost-effective prices of the manufacturer, the company offers Electrocentury-steel. The provider ensures timely delivery of goods to the point specified by the client.