Steel water outlet. Types of pipe bends

There is no pipeline that runs straight all the time; after all, there are various kinds of obstacles on its way, as a result of which the pipeline has to be turned. For this, special pipe bends are intended.

A bend is a part of a pipeline that is required to smoothly change its direction.

Today there are such classifications of bends:

Welded;

Steeply curved;

Steel;

Segmental;

Forged;

The use of bends is quite diverse. They are widely used to ensure the life of any state, as well as in the life of every person. For example: bends are used in the installation of oil pipelines, in the construction of various equipment (pumps, compressors).

Steeply curved bends

Quite often, when building a pipeline, it is necessary to form a sharp turn. For this, special steeply curved bends are made, capable of connecting pipes at a large slope angle, while maintaining their integrity. But before purchasing such a tap, you first need to find out what material it was made of. And then find out how this material will behave in contact with the working medium that will pass through the pipeline. That is, bends are usually made of various materials, and may be suitable for a particular work environment. You can make a steeply curved bend to order, having previously indicated its purpose.

For the production of steeply curved bends, the following types of steel are used:

Carbon steel - 20;

Low-alloy steels - 09G2S;

Corrosion-resistant steels - 20C, 20FA;

Heat-resistant steels - 15X5M;

Stainless steels - 10Х17Н13М2Т.

Examples of steeply curved bends can be viewed: http://www.ua.all.biz/otvody-bgg1074490

Welded bends

Bends of this type can be bent or steeply curved. The main difference between welded bends is that after they are connected to the main pipeline, a welded seam remains. Also, these bends can be thick-walled or thin-walled. The main purpose of the welded type bends is for the transportation of non-corrosive active gas. Such bends are made of carbon or low-alloy steel. Rarely, for the production of elbows, high-strength, high-alloy steel is used.

Bent bends

Bends of this type are obsolete. Today they are used quite rarely, since in terms of their characteristics they are much inferior the newest species taps. Bent bends are subjected to greater deformation, as a result of which microcracks, imperceptible to the eye, may appear on them, and this is the first step to losses of the enterprise, which owns the pipeline. Such bends are not in demand because of their small diameter (no more than 50 mm are produced). The only advantage of bent bends is their low cost.

For the production of bent bends are used carbon steels (steel 20), low-alloy steels (09G2S), corrosion-resistant steels (20A, 13HFA), heat-resistant steels (12H1MF) and stainless steel ((08) 12H18N10T).

Bent bends made of steel seamless and welded thin-walled pipes are most often used in the automotive, chemical and aerospace industries. They are also used in utility networks and when laying oil and gas pipelines.

Steel bends

Today steel bends are the most demanded, as they are much cheaper than other types of bends. They are very reliable to use, ideal for a variety of obstacles as well as many types of work environments. For the ideal selection of steel bends, it is recommended to take into account the peculiarities of the pipeline being laid.

Certain types of steel bends due to their own technical specifications can be used in climatic conditions of the Far North.

Forged bends

Due to their high performance, forged bends are becoming popular today. They are manufactured in high quality, resulting in high reliability. Plus, forged bends are produced in large diameters - up to 1400 mm. During the production process, the workpiece is heated to high temperature, and then the branch is forged. Hence the name of this product comes from.

No pipeline can be laid exclusively in a straight line. Parts called “bends” are used to provide directional correction and avoidance of various obstacles.

You can purchase fittings of various types and sizes by following the link: http://www.sm2000.ru/katalog-detaley-truboprovodov/detali-truboprovodov/otvodi/.

Classification of pipe bends

You can classify bends according to the following criteria:

material used for manufacturing:

used technology for the production of bends:

• welded bends, after connecting to the pipeline, form a seam at the joint. Mostly used for pipelines transporting gaseous media;
• bent bends are an outdated type of connections that are rarely used now. Microcracks often occurring in the connecting parts are the reason for the rejection of this type of bends;
• steeply curved elbows maintain pipe integrity by connecting them at a steep angle. This view bends can be made of various types of material and must be selected depending on the technological purpose of the pipeline;
• forged elbows are becoming more and more popular due to their consistently high quality and reliability in operation. This type of bends can be produced with a diameter of up to 1400 mm;
• die-welded bends are used in pipelines intended for the transportation of oil and gas under severe temperature conditions;
• segment bends are designed to connect elements of large-diameter pipelines.

Benefits of steel elbows

High indicators of wear resistance and corrosion resistance allow the use of steel bends for pipelines transporting aggressive media. It can be either hot water or steam, as well as various chemical compounds.

Resistance to temperature extremes makes it possible to operate pipelines equipped with such bends, both in extreme heat and at the lowest temperatures.

The plasticity of the material makes it possible to manufacture parts of the required shapes and sizes for each specific pipeline.

How pipe bends are made is shown in the video:

The part is a pipe segment that is bent at an angle of 30, 45, 60, 90, 180 degrees. Products are made mainly from steel. This material provides reinforcement with high strength properties, hardness, corrosion resistance, excellent weldability.

Depending on the manufacturing method, the following types of pipe bends are distinguished:

• welded;
• seamless.

Welded bends	Seamless bends

In turn, all pipe parts are divided into steeply curved and bent. The first has a small bending radius (up to 1.5 Du), small dimensions. The latter are characterized by high weight and parameters. They are used when it is impossible to operate steeply bent fittings.

What is the tap used for?

The part is used when laying technological and main pipelines. It connects pipes, smoothly changes the direction of flow. The devices are mounted by welding, flanges, threads.

The use of valves, operating restrictions are established by the current industry standards. Design and normative documentation regulates the size, design, technical requirements... Products are produced in two versions.

Use fittings in:

• oil and gas sector;
• heating systems, fire extinguishing, water supply;
• the sphere of housing and communal services;
• energy;
• metallurgy and other industries.

Elbow type 1

According to the general technical specifications knees of the first execution are made according to the standards international standard ISO 3419 from foreign steel grades (or their analogues). There are two types of devices:

• 2D - the angle of curvature of the product is equal to the nominal diameter of the pipeline;
• 3D - bending radius is 1.5DN.

Elbow type 2

Pipe parts are manufactured in states that have adopted GOST 17380-2001. In the production of fittings, the regulations of the valid regulatory documents... Fittings are common in the area Russian Federation... Available in all standard sizes (diameters).

What is the difference between elbow and knee

Some sources report that the parts differ in their purpose. One is used to change the direction of the pipeline. The second is used to separate or combine two streams in the same plane.

In fact, there is no difference between elbow and knee. These words refer to the same device. Produced by stamping, pulling along a horn-shaped core, by welding.

As a result of the application of the first manufacturing methods, seamless piping units are obtained. Devices without welds, can withstand more pressure. They are used when working with medium and highly aggressive substances.

Production materials

Connecting pipeline elements are made from:

• carbon, alloy, stainless steel;
• low pressure polyethylene;
• polyvinyl chloride.

Steel products have the greatest strength, resistance to the negative effects of corrosion and oxidation processes, chemical reagents... Depending on the brand used, the valves can be operated in any region, regardless of climatic conditions.

Characteristics of steel grades:

• art. 20 - characterized by increased hardness, has no restrictions in welding;
• 09g2s - resistant to temperature deformations, allows the use of pipe parts in cold and moderately cold climates;
• 12x18n10t - it is particularly resistant to corrosion.

Polymer fittings are inferior to steel ones in terms of performance. They are not designed to work with aggressive media, at critical and supercritical temperatures of the transported products. It is forbidden to install plastic elbows in systems transporting refrigerants and refrigerants.

Elbow Standards

Our company provides industrial enterprises connecting parts made according to the standards:

• OST 34-10-752-97 - sector pipe parts for thermal power plants, designed to operate in systems with pressures up to 22 kgf / cm²;
• OST 36-21-77 - sectional welded parts withstand loads up to 2.5 MPa;
• GOST 30753-2001 - 2D type seamless fittings;
• GOST 17375-2001 - 3D steeply bent knees.

The documents regulate drawings, materials, technical requirements. Products are made from certified raw materials that have passed the incoming control procedure. The workpieces are checked for test benches on mechanical properties.

Devices are inspected for compliance with dimensions, absence / presence of external damage. The surface of the reinforcement should not contain cracks, dents, splashes from metal and welding, captivity, and other deformations. The product has certificates, quality certificates. Delivery of pipeline elements is carried out throughout Russia, to the CIS countries.

Steeply curved steel bends are elements that are used for the installation of metal pipelines for various purposes, including systems:

• cold and hot water supply;
• heat supply and heating;
• gas supply, etc.

Bends are used to perform sections of pipeline bends. The most common products are with a rotation angle of 90 degrees.

Production is carried out in accordance with GOST 17375-2001 from VGP pipes or seamless pipes... The material is carbon or alloy steel. Depending on the method of connection, a distinction is made between welded and threaded bends.

A feature of steeply curved products is a small bending radius. This greatly simplifies the layout of the pipelines.

Steel steeply curved bends wholesale

The Santekhkomplekt company offers to buy 90 g steeply curved bends in our online store in Moscow with the possibility of delivery throughout Russia. The catalog contains a large selection of products. All products are supplied from the best manufacturers and comply with GOST. We have favorable discounts for wholesale customers and offer the services of a qualified personal manager.

A branch is a part of the pipeline that is used to change the direction of the substance transported by the pipeline.

This conclusion can be made by studying GOST 30753-2001.

We can simply say that a bend is a part that smoothly changes the direction of the pipeline. Various substances and products are transported through pipelines, from steam to liquids. Depending on this, different steel grades and pipe manufacturing methods are used. All this is strictly regulated by standards, documents and technical specifications approved by the state or sectoral ministries and departments.

Seamless elbows

Seamless elbows are made of seamless or electrically welded pipes. The manufacturing technology of such a bend and its radius distinguish seamless bends from bent bends. The bend radius of the bend is no more than 1.5 nominal bore of the pipe used. Such bends are made using technological process, called a hot broach. You can purchase two types of seamless elbows, corresponding to GOST 17375-2001: with a conditional diameter (DN) 15-400 mm and with DN 25-500 mm.

Stamp-welded bends

The name of the bends speaks for itself. They are made by initial stamping and subsequent welding of sheet steel. This is a rather infrequent way of making bends. The reason for this is the complexity of the execution and the high labor intensity of the welding production. On the positive side, these bends can be customized with any DN and any bend thickness. It all depends only on the wishes of the customer.

Welded bends

Welded bends are manufactured in accordance with OST 36-20-77. For from production, sections of labor are used with Du, which corresponds to the conditional passage of the pipeline. Although it is possible to manufacture almost any welded bends, with any bend angles and wall thickness, the best option is DN 100-1600 mm with an angle of 90 °.

Bent bends

Bent bends are made by hot or cold bending from seamless or electrowelded pipes... Such bends are installed on pipelines with DN from 15 to 50. Bending radius, in the best option, is 1.5 times the nominal diameter of the pipe used in the pipeline. The standard options are tilt angles from 15 ° to 60 °.

Steels and alloys used for the manufacture of bends

As mentioned above, pipelines can be used to transport a wide variety of products, therefore, steels and alloys for the manufacture of bends used in pipelines can be used differently. Properties are selected depending on the transported substance and the climate where the pipeline is used. The price of both the entire pipeline and its individual parts (including bends) directly depends on the material of their manufacture. Bends are made of the following steels and their alloys:
corrosion-resistant;
heat-resistant;
carbonaceous;
alloyed steel alloys.

Where to buy bends?

LLC Gazneftdetal offers various bends: solid-drawn, stamped-welded, welded, bent, which are manufactured different ways, from different grades of steel and alloys. Depending on the wishes of the client, the staff will select the necessary taps, the highest quality and in almost any price category. The purchased bends are suitable for use in any pipeline, regardless of its purpose and mode of use.