Sliding pipe supports for pipeline protection

Laying and installing pipelines is a complex engineering task. The characteristics and location of the supporting structures that take on the load from the pipeline along with the transported substance are of great importance for the reliable operation of the system. An important element of this system is the sliding support for pipelines, which supports the pipe, allowing it to move along and across its axis.

Purpose of structures

Pipeline systems are the optimal way to deliver raw materials such as gas and oil to processing plants. With this method, system reliability is important. You need to take security seriously. The presence of sliding support structures increases the safety of operation in general.

The structures support the pipeline system and absorb static loads from the mass of the pipes and the technological products filling them (weight load). These loads must be distributed evenly along the entire length of the pipeline to prevent increased stress in individual sections. There is also a change in linear dimensions associated with changes in the ambient temperature and the temperature of the transported substance.

When pumping, pipeline systems may experience torques, lateral and vibration loads. Support structures are designed to absorb and redistribute these loads. According to application, the following types are distinguished:

1. Fixed . Prevents pipe movement. The elements are welded to the supporting surface.
2. Movable . They are fixed on the pipe and can move relative to the support platform, providing the necessary design parameters.
3. Sliding supports for pipelines are one of the types of movable support structures. They provide longitudinal movement of pipes, as well as transverse movements over a given distance.

Structural elements are sliding and roller bearings, fasteners, clamps.

Purpose of fixed pipeline supports

During operation, pipes and other pipeline parts, shut-off, control, protective and other types of fittings experience various types of mechanical loads:

• soil movements and subsidence;
• vibrations from operating equipment and seismic activity;
• wind and snow loads;
• internal stresses in structural materials, welds and threaded connections;
• hydraulic shocks of the working environment;
• linear, annular and volumetric expansion of alloys and metals.

Foundations are most often constructed of concrete, and the transmission link between them and the pipeline itself is precisely the supports, which, on the one hand, follow the shape of the pipes, and on the other, provide a flat surface for installation on the foundation.

For rigid fixation of pipes/fittings to the foundations, fixed steel pipeline supports are used.

Go to the catalog of pipeline supports, production from 1st day.

Types of sliding supports

Sliding bearings are usually made of metal. The main parts of the supporting structures are the base, racks and a semicircular holder (cradle). A channel or corner is used for the base. There are several types of supports:

1. Sliding clamp support for pipelines. The pipe is attached to the support with clamps. Gaskets are placed under the base to protect the insulating coating.
2. Ball. Used in pipelines to compensate for lateral movement.
3. Roller. Allows movement along the longitudinal axis in cases of thermal expansion and contraction.
4. Dielectric. Paronite gaskets under the base of the pipes protect the pipeline from stray currents.
5. On metal brackets. Provides movement of the pipe in the direction specified structurally.

Pipeline sliding supports are a way to solve some of the problems associated with shrinkage, but not only them.

Support structures support the pipeline and take on vertical loads. This type of support is welded to the pipe to reduce abrasion of the pipe surface during displacement. If this is not done, then abrasive particles and dust can get into the gap between the pipe and the support. This will lead to thinning of the pipe wall, which can cause an accident.

Production of pipeline supports

Support products are made of steel. When operating a pipeline under normal conditions, standard long products are used. If the highway operates in specific conditions, then metal supports are selected that can withstand the load of high-temperature substances or exposure to a cold environment, for example, in the Far North.

The production of pipeline support structures includes the following stages:

1. Cutting steel sheets on high precision machines.
2. Cutting the material on a guillotine.
3. Cutting steel sheets using belt equipment.
4. Welding of elements.

Clamps are used to connect steel sections. They are produced on automated presses. Thanks to them, it is possible to achieve high quality elements. Metal supports are used for maintenance:

• oil pipelines;
• gas pipelines;
• for the operation of nuclear and thermal power plants;
• for launching polyurethane foam heating pipes.

The industry produces metal supports of the following types:

1. Movable (sliding, roller, etc.).
2. Fixed (clamp, welded, persistent).

Fixed supports for polyurethane foam heating pipes

Fixed products for polyurethane foam heating pipes are manufactured to install reliable fastening of the pipeline and maintain it in a given position.

Support for heating main

Such pipe supports are used in overhead and underground pipelines. The fixed structure is designed to compensate for the load of the external environment, for example, temperature fluctuations, vibration, pulsation, etc.

A fixed support for the polyurethane foam heating pipe is installed in combination with compensators, which help to evenly distribute the load. This is especially necessary for metal structures laid in the northern regions.

For fastening, the fixed structure uses clamps or welding. In order to firmly secure the clamps, stop strips are attached to the pipe by welding.

Fixed structures are widely used in the operation of polyurethane foam heating pipes. They are an important component of utility networks in polyurethane foam insulation. Supports for polyurethane foam heat supply pipes are operated in accordance with GOST 30732-2006.

Fixed structures for polyurethane foam heat supply can be used for underground installation of duct or non-duct type.

PPU heat supply structures are characterized by waterproofing, resistance to temperature fluctuations and corrosion. Although supports for polyurethane foam heating pipes are made of steel components, they do not require additional electrochemical protection.

Application in economic activities

Sliding supports protect the insulating coating of the pipelines and significantly increase the service life of the system. They are used in pipeline systems transporting products from various industries:

1. In the oil and gas industry.
2. In the main heating supply.
3. In housing and communal services.
4. At industrial enterprises.
5. When creating engineering communications with the need for longitudinal movement of the pipe.
6. They service nuclear power plants and thermal power plants.

The areas of application of different types are regulated by regulatory documents, which indicate the methods of using various structures, drawings, norms and standards for their use.

Classification of fixed supports

Within their subcategory, fixed pipeline supports with rigid fixation of pipes are classified according to a number of characteristics:

structural material - concrete, reinforced concrete, steel assortment of brands, channel, I-beam, angle, tubular coils and sheet steel in the form of plates;

type of execution – welded or dismountable design with bolts/studs

support design - clamp, welded, yoke, bracket-shaped, with stops, panel, side, in polyurethane foam;

manufacturing standard - NTS 65-06, STO 79814898, OST 36-17, GOST 16127, GOST 14911, OST 108.275, OST 24.125, OST 34.10, OST 36-146.

There are frameless supports. Initially, the bulk of fixed supports for gas pipelines in Moscow are used from the 4.903-10, 5-903-13 and 1-487-1997.00.00 series. Or the structures are made according to drawings L8-136, L8-141 – 148, L8-180, L8-190 – 199, L8-200, L8-508 – 524.

Installation of sliding support structures

The distance between sliding supports is determined in accordance with the purpose of the pipeline systems and on the basis of strength and deflection calculations. The span is determined depending on the installation method, the parameters of the transported substance and the diameter of the pipeline. Weight, wind and other external loads are taken into account. Installation of movable supports is carried out before pulling the pipes into the cases. This is done so as not to damage the factory insulation. To reduce friction, graphite lubricant is applied to the contacting surfaces. Areas of insulation damaged during welding are painted over.

The importance of using sliding support structures has been proven by theory and practice in the design and operation of a huge number of operating pipelines. Extensive application experience has been accumulated, and many regulatory documents have been created to simplify the design of pipeline systems. But the importance of the task requires careful attention and a qualified approach.

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Types of fixed pipeline supports

Overpasses are made of pipes of different diameters, have branches, fittings and special equipment, pass underground, on the surface of the ground and at some elevation from it. Therefore, fixed pipeline supports have many design options, in which different technical solutions are used to support pipes and fix them in space without a single degree of freedom.

Supports in polyurethane foam insulation

Fixed pipeline supports in polyurethane foam insulation are used for channelless installation. The design has the form of a steel sleeve with external insulation in a galvanized shell inside a panel support made of thick-walled metal sheet. The support is mounted at the site of operation, and the main pipes are welded to the glass inside this standard product.

There are climatic versions HL and U with different thicknesses of the heat-insulating layer. For underground routes, a polyethylene shell is usually used, which is not destroyed by ground and soil waters. Ground and overhead highways are often built on fixed supports with a galvanized shell. The production of products is regulated by the GOST 30732 standard. The marking first indicates the parameters of the pipe, then the steel shield, the type of insulation and shell, and the standard number.

"Dead" support

On the one hand, a dead support has zero maintainability. On the other hand, the design is adjusted once and cannot loosen over time. Technically, a dead support usually looks like this:

• a piece of I-beam or channel located across the pipeline;
• pillows made of sheet material for pipes;
• clamp for welding to the pipe body.

Typically, dead supports become anchors in front of bending sections of pipelines and strengthen the main lines in the area where the branches adjoin. They are part of the series of fixed supports 4.903-10, certified according to the OST 36-17-85 standard.

Lateral fixed support

According to the documentation for the 4.903-10 series, the side supports are marked T10, and in the 5.903-13 series they are also designated as TS-668.00.00, with the last four zeros most often omitted. From the name it is clear that the products are intended for lateral support, that is, compensation of loads in the horizontal plane.

The main nuances of the design of the side fixed supports are:

• for pipes DN 194 – 1420 mm;
• for pipelines with frequent temperature changes and high environmental pressure;
• of the four stops, two are equipped with cushions, the remaining two do not have them;
• all 4 stops are welded to the wall of the pipeline.

Roller supports - PZMK

invites you to order roller supports for pipelines. They are movable systems that allow you to adjust the axial movements of pipes and are used for the installation of pipelines.

Such roller supports are built on a combination of a roller block and a sliding support. They are based on the design of the roller, which provides the ability to move the support along the axis of the pipe. Lateral sliding of the welded support along the roller base is also allowed, but should not exceed 50 mm.

The supports are made from different grades of steel (depending on the diameter) - chrome-molybdenum-vanadium, carbon and other types.

The use of roller bearings and their design

Roller supports are used in cases where sliding structures cannot effectively cope with this task. Their use can significantly reduce the friction force. Thanks to this, they react more sensitively to pipeline movements and are well suited for installing pipes in tunnels and various similar places.

This type of support is in demand for the installation of pipes made from low-alloy or carbon steel, which are intended for transporting liquids and gases with temperatures from 0 to 450ºC under pressure up to 10 MPa. They are suitable for use in the most severe weather conditions - even at -70ºС, and therefore their scope of application is quite wide.

Supports of this type consist of the following parts:

• sliding clamp;
• spring block;
• base plates;
• roller block, which can be single-row or double-row and is located depending on the ambient temperature.

When choosing a suitable support, you need to pay attention to the model designations, which encode all its main parameters (support design, steel grade and pipe diameter).

Our offers

You can order pipeline design services using them and purchase high-quality roller bearings. We offer:

• a wide range of metal structures made of different types of steel and with different characteristics;
• prompt execution of orders, including individual ones;
• reasonable cost of production;
• professional service with advice;
• numerous additional services (installation, design, delivery, etc.).

Roller supports according to OST 24.125.159

pzmk-spb.com

Prices for supports for series 5.903-7:

Prices for supports for series 5.903-8: