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Pipelines and pipe systems

TNGROUP EOOD builds complete pipelines and pipe structures of various types. Performs cutting, clamping, bending of pipes, connection, installation. We work on isometric drawings.

Each pipeline consists of basic elements. These are pipes and their connections, profile parts, fittings and supports, as well as additional elements – measuring devices, remote controls, insulation and others. Usually, pipes are made from metal-steel, cast iron, non-ferrous metals, and for more special purposes – from plastics, concrete, reinforced concrete, ceramics, glass, porcelain, wood and others. In order to install a pipeline of a certain length, the individual pipes must be connected to each other. They are connected by non-threaded sockets, threaded sockets, flanges or by welding. Our base has straight-seam, seamless, spiral-welded pipes in stock.

Peculiarities in installation and operation of pipelines and fittings

The volume of work on the installation of technological pipelines compared to the total volume of installation work in chemical industries reaches 35 ÷ 40%, and in the oil refining industry up to 55 ÷ 60%.

The welding of the pipes and their elements is carried out on special stands, which ensure quality welds and their testing.

When centering the welding pipes, special devices are used, ensuring the necessary accuracy.

When installing separate parts of the pipelines, it is often necessary to connect them with flanges and ensure the perpendicularity of the surface of the flange to the pipe. This can be done using special devices. Pipes are cut on special lathes or with the necessary cutting tools. Pipe heat treatment is often required during installation or cleaning with sandblasting tools. Before assembling the pipes and parts, it is necessary to clean them from dirt using compressed air. Details covered with lubricating oils are deconserved by heating in chambers or in baths with mineral oil at a temperature of 100 ÷ 120 oC.

Their cleaning can be continued by washing with alcohol or gasoline with hot water and cleaning solutions.

During the installation of the pipelines, after their placement along the route, leveling is carried out in the horizontal and vertical direction of individual segments (parts) over a certain distance. Movable and fixed supports, fittings, temperature compensators and others are placed. When installing inter-shop pipelines, it is possible to use lifting machines, cranes, etc. When installing pipelines inside the workshops, it is necessary to ensure access to all elements of the pipeline fittings. Pipelines are most often installed as assembled units, representing a section of the pipeline with fittings, compensators and thermal insulation. In recent years, the block equipment method (block assembly technology) has been used a lot. In this method, several units of equipment together with pipelines, fittings, control and management devices arrive at the installation site in a ready form from the manufacturing company. The blocks are installed in a certain order of assembly. This increases the speed of installation and its reliability. After the completion of the installation works, hydraulic or pneumatic tests of the pipelines are carried out in order to check the tightness and strength of the construction.

Pneumatic tests are performed when it is impossible to perform hydraulic tests, for example, at an ambient temperature lower than 0 oC, or in the absence of water at the work site. During tests, the pressure is increased to certain limits and is held for 5 minutes, during which a complete inspection is made of the condition of the pipeline – of the welds, welds of fittings and its sealing elements. Defects found are removed after lowering the pressure to atmospheric, and the tests continue and the results are considered satisfactory in compliance with the relevant instructions and standards for the operation of the equipment.