Steel transitions: varieties and their scope

During the design and construction of piping systems special attention is paid to detailing the joint and joints in the pipes with different diameters. In areas of connection fittings, which is called drilling steel and allowing the free flow of the working medium in both directions. This material is in many cases very popular.The Russian manufacturers produce standard transitions steel in accordance with GOST 17378-2001 and specialized crossings installed at the junction that do not meet the parameters of standardization.There are two types of valves, which are installed the pipelines: eccentric and concentric.

In the first case, there is an offset on the inlet and outlet axis of flow to a negligible amount, which nevertheless can affect the traffic flow. Here the lower forms becomes a place of connection.

In the second case, the transition steel concentric facilitates soldering of pipe joints without displacement along the axis of movement of the worker thread.

The Flow passing through the living section of the pipeline over a period of time, may increase or decrease, changing the working pressure. This process depends on the transition steel.

Material for the manufacture of the valve is steel of different grades. For work in low pressure and non-aggressive environment transitions steel is made of carbon steel St3, ST10, ST20. These products, manufactured from steel brands such as 12Kh18N10T, 15h5m, are used for transport flow of aggressive media in steel special compounds are added to improve corrosion resistance and service life. Of steel with the low corrosion resistance transitions produce steel with a zinc coating in a single layer.

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An Important property of reinforcement is the maximum allowable working pressure, dependent on material and geometrical parameters, which allows to withstand a working pressure ranging from 4 to 160 MPa corresponding to the maximum allowable.

Transitions welded steel designed for the operating pressures of 16 MPa and operate at temperatures from-70 to +450°C, and are resistant to difference of temperature and pressure.
Existing technology allows the production to produce rebar by way of stamping or casting centrifugal electroslag getting it without seams, which increases the reliability and service life.

Requirements for the material of the valves and installation:

- the steel should have a high plasticity, structure, savarimuthu and impact strength;

- the observance of the proportionality of the transition holes and the pipe roundness and plane ends.

Choosing transitions steel, should adhere to the following criteria:

- diameter of inlet and outlet pipes;

- the type of material and its strength characteristics;

- view working environment and the temperature difference;

- operating pressure.