Currency KZT
Construction of pipelines order in Stepnogorsk
Order Construction of pipelines
Construction of pipelines

Construction of pipelines

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Kazakhstan, Stepnogorsk
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Description
Construction of pipelines is very difficult and responsible process. The level of these works reached now is explained by introduction and improvement of modern equipment due to transition from muftovy connections to the butt welding widespread now which appeared an ideal method of connection of the elements laid in the earth.

At installation of pipeline systems generally apply vertical welding either from top to down, or from below up. Except the direction of this process and like an electrode cover, these ways differ, first of all, in amount of heat entered into a welding bathtub. At the same time apply electrodes with cellulose additives in a cover. Thanks to it at higher power expenses the high speed of implementation of construction of pipelines is reached. At vertical welding from below up usually use products in a cover from rutilovy acid. Power expenses at the same time it is less, than at process from top to down, but the heatsupply is more, owing to the low speed of melting.

Apply the manual arc welding providing a seam with the angle of disclosure 60 ° to performance of the butt seams which are usually used at construction of pipelines obtusion high 1,6 ± 0,8 mm and disclosure of facets about 1,5 mm at a thickness of walls of a pipe approximately to 12 mm. At a bigger thickness of walls it is necessary to carry out connection of a special form. At vertical process from top to down of separate systems from steel with high strength properties (at the expense of an additive of the alloying components) it is noted that in the absence of preliminary heating or at insignificant heating in a zone of a root of a ring seam there are cracks.

Vertical welding is applied mainly at construction of pipelines of limited length, and also to a svarivaniye of special details, for example shutoff valves, and at production of the connections demanding special adjustment under the sizes. When at installation the high speed of connection is required, apply additive materials with the cover containing cellulose. Character and volume of necessary tests by means of nondestructive control methods should be estimated in each case by the applied method, material, atmospheric conditions.

When laying petrohighways character and volume of nondestructive control methods is determined by the agreement. As a rule, selective testings in volume from 10 to 30 all ring seams are sufficient for confirmation of their quality. In areas with increased requirements to operation, the volume of tests in some cases can reach 100%. Control of welding by means of radioactive isotopes is similar to x-ray control of welded seams. It is easier to carry out it at construction of pipelines though it gives not such bright picture in the image of details as x-ray raying.
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Construction of pipelines
Construction of pipelines
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