Initially, the GOST 17376 tee fully complies with the domestic standard, is certified without fail, has standard dimensions and is 100% available in the finished product warehouse. The standard 17376 developed by the Montazhspetstroy organization includes transition and equal-bore tees made of low-alloy and carbon steel, seamless tubular blanks under pressure within 16 MPa for temperature ranges from -70°C to +450°C with welding pipes.
Requirements of the GOST 17376 standard
Since the entry into force of the GOST 17376 standard, it has gone through several revisions, the last of which was carried out in 2007. The documentation complies with the regulations of the international standard ISO 3419 for welded fittings made of carbon and alloy steel.
Thus, the GOST 17376 tee has several design options, standard construction dimensions and configuration. The standard specifies the materials, scope of application of fittings and markings.
Design features
For tees according to GOST 17376, there are two versions:
- 1 – the wall thickness of the ends of two holes on the same axis may differ from the wall thickness at the end of the third hole, the pipe diameter is not standard;
- 2 – the wall thickness of the tee at all three ends is always the same.
The first version is developed based on DIN standards, the second version takes more into account the realities of domestic pipelines. Regardless of the design, tees according to GOST 17376 can be:
- equal bore - the DN diameters of all holes are absolutely identical;
- transitional - the diameter of the upper hole does not coincide with the DN of the side pipes.
There is no climate classification for these fittings.
Standard sizes of tees according to GOST 17376
In the first version, the GOST 17376 tee has a size of DN 15 - 1000 mm. The table below shows the options for transition bends and wall thickness for each diameter:
| DN (mm) | Outer diameter (mm) | Wall thickness (mm) | |
| 15 | 21,3 | 21,3 | 2/3,2/4 |
| 20 | 26,9 | 21,3 | |
| 25 | 33,7 | 21,3/26,9 | 2,3/3,2/4,5 |
| 32 | 42,4 | 21,3/26,9/33,7 | 2,6/3,6/5 |
| 40 | 48,3 | 26,9/33,7/42,4 | |
| 50 | 60,3 | 33,7/42,4/48,3 | 2,9/4/5,6 |
| 65 | 76,1 | 42,4/48,3/60,3 | 2,9/5/7,1 |
| 80 | 88,9 | 48,3/60,3/76,1 | 3,2/5,6/8 |
| 100 | 114,3 | 60,3/76,1/88,9 | 3,6/6,3/8,8 |
| 125 | 139,7 | 76,1/88,9/114,3 | 4/6,3/10 |
| 150 | 168,3 | 88,9/114,3/139,7 | 4,5/7,1/11 |
| 200 | 219,1 | 114,3/139,7/168,3 | 6,3/8/12,5 |
| 250 | 273 | 139,7/168,3/219,1 | 6,3/10 |
| 300 | 323,9 | 168,3/219/273 | 7,1/10 |
| 350 | 355,6 | 219,1/273/323,9 | 8/11 |
| 400 | 406,4 | 273/323,9/355,6 | 8,8/12,5 |
| 450 | 457 | 323,9/355,6/406,4 | 10 |
| 500 | 508 | 355,6/406,4/457 | 11 |
| 600 | 610 | 406,4/457/508 | 12,5 |
| 700 | 711 | 711 | not standardized |
| 800 | 813 | 813 | |
| 900 | 914 | 914 | |
| 1000 | 1016 | 1016 |
In the second version, the nominal diameter of the tees is 15 - 400 mm:
| DN (mm) | Outer diameter (mm) | Upper pipe diameter (mm) | Wall thickness (mm) |
| 15 | 20 | 20 | 2/3/4 |
| 20 | 25 | ||
| 25 | 32 | 20/25 | |
| 32 | 38 | 20/25/32 | |
| 40 | 45 | 45 | 2,5/4/5 |
| 50 | 57 | 3/4/5 | |
| 65 | 76 | 45/57 | 3,5/6/7 |
| 80 | 89 | 57/76 | 3,5/6/8 |
| 100 | 108 | 76/89 | 4/6/8/9 |
| 100 | 114 | 76/89 | 4/5/6/9 |
| 125 | 133 | 89/108 | 4/6/8/10/12 |
| 150 | 159 | 108/133 | 4,5/6/8/10/12 |
| 200 | 219 | 133/159 | 6/8/10/12/16 |
| 250 | 273 | 159/219 | 7/10/12/16/18 |
| 300 | 325 | 219/273 | 8/10/12/16/22 |
| 350 | 377 | 273/325 | 10/12/16/20 |
| 400 | 426 | 325/377 | 10/12/16/18 |
The weight of hydraulically stamped tees differs from the weight of fittings made by flanging with a punch using a die-free method.
Construction materials
The following types of steel are used for the production of GOST 17376 tees of the first type, that is, oriented to the DIN standard:
- E24-1 and E24-2 – French steel, analogous to Art. 3 sp/ps/kp;
- P5, P9, P18, P32, P34 and P43 – Chinese low-alloy steel;
- TS4, TS9, TS10, TS18, TS32, TS34, TS37 and TS43 – European marking of alloy steels.
Tees of the second type are made from domestic rolled metal pipes made from the following steels:
- 10 and 20 – carbon steel with high ductility and weldability;
- 10G2 – structural alloy steel;
- 20YuCh – material is resistant to corrosion cracking;
- 15GS – steel for welded structures;
- 09G2S, 16GS, 17GS, 17G1S, 10G2S1 – low-alloy structural steels.
To ensure plastic deformation of the metal, preference is given to hot-rolled and cold-drawn pipes made of steels with appropriate properties.
Manufacturing technology
GOST 17376 tees are produced in two ways - hydraulic or mechanical stamping. The upper pipe, located at right angles to the axis of the other two openings of the fitting, is squeezed out in the first case by high liquid pressure into the only cavity of the split matrix while simultaneously moving the punches inside the workpiece.
In the second option, a punch on a stand is placed inside the tubular part, which is used to flange the oval hole in the place of the upper pipe.
Hydraulic stamping technology uses the principle of steel transitioning into a plastic state under high fluid pressure in a section of the workpiece under which part of the matrix is missing. The construction material is evenly distributed into a given shape without creating a through hole. Then the end is cut on a machine, and a concave steel plate becomes a waste product.
The hot stamping method is waste-free, that is, less material-intensive. However, to achieve plasticity of the structural material of the workpiece, local high-temperature heating with a gas-air burner is used. Which also increases the cost of fittings.
On the other hand, both technologies make it possible to ensure the integrity of the product without welds, which are traditionally the weak link of any stamped-welded fittings.
Application area
The use of tees GOST 17376 is regulated by another standard GOST 17380 in its first section:
- only for pipelines assembled by welding;
- application in technological lines and piping, local and main pipelines and tanks with operating pressure within 160 kgf/cm2;
- working environment temperature and climatic conditions in the temperature range from -70°C to +450°C;
- use in pipelines for any purpose, including at supervised facilities of Rostekhnadzor.
In other words, tees stamped hydraulically and mechanically from a seamless pipe with welded ends can be used in housing and communal services systems and piping of energy facilities, private communications and life support systems of populated areas, in departments of the chemical industry and the oil and gas industry.
Tee markings
The tee is designated GOST 17376 in accordance with the following regulations of the current standard of the Russian Federation:
- the design option is indicated in the first place in the marking;
- followed by the main diameter of the two lower pipes;
- then the diameter of the upper pipe is indicated (only for transition tees);
- in the next place is the grade of structural material, in this case carbon or low-alloy steel;
- The GOST number completes the marking.
For Russia, version 2 is preferable, since it is created from standard pipes, so it is usually omitted in the markings. Option 1 is required. The wall thickness is indicated for each tee pipe immediately after its diameter.
We ensure constant availability in warehouses of GOST 17376 tees and other pipeline parts, shut-off, control and safety valves. We produce part of the range in-house, and we are official dealers of leading reinforcement brands in the Russian Federation.
A tee is one of the types of fittings. This part, which connects a pipeline with three holes, allows additional branches to be connected to the main pipe. It is most often used by oil and gas enterprises when used in areas with temperate and cold climates.
The material used to make this part is stainless steel. There are two types of steel tee.
This is equal bore - connects pipes with the same diameter (most often used locally); transitional - has different hole diameters (most often used in large enterprises).
A steel tee can be used to transport water, steam, gas, oil and other substances in critical pipelines. And its resistance to corrosion makes it possible to use it in areas with high humidity. This steel product can withstand temperature fluctuations from -70°C to +450°C.
The design of a steel tee consists of: a welded part and three pipes, which are covered with heat-insulating material. The following methods are used to produce these products: hot stamping, welding and hydraulic stamping. Very often, seamless electric-welded pipes are used in production. To produce steel tees, cutting and trimming machines are needed.
The manufacturing process consists of several stages:
- On cutting machines, a part of a certain length is cut;
- When the workpiece has already been made, a part is made from it using hot or hydraulic stamping.
Of course, most often it is stamped from a single sheet, since this method is cheaper than others. Hot stamping is used in large enterprises, since this option is economical only for large-scale production. Hydrostamping is a middle option; it occupies, so to speak, an intermediate position. It can be used in both large and small enterprises.
The qualitative characteristics of these steel products are determined according to GOST standards.
Steel tee GOST 17376. It is made of carbon and alloy steel, and is used in the construction of industrial pipelines. There are several types of this model: galvanized, steel for welding, transitional.
Steel tee GOST 17376 2001. Seamless and welded parts of pipelines made of low-alloy and carbon steel. Purpose of GOST 17376-2001: the standard applies to transitional and equal-bore seamless welded products. They are used in accordance with section 1 of GOST 17380.
Steel welded tee GOST. It is manufactured for welding. This is the most common type of steel tee. They are divided, as mentioned above, into: equal-bore and transitional.
Flanged steel tee GOST. A flange is a part of a pipeline; their main differences are only in diameters and GOST standards. Types of flange connections: flat welded; welded collar butt; free on the welded ring. Flanges are produced according to the following documents: flat – according to GOST 12820-81; collar - according to GOST 12821-81 (the collar flange is also manufactured according to DIN 2633 standards, with a design and size according to DIN 2633); free on a welded ring - GOST 12822-80.
Steel tees are used not only in large enterprises. They are also used in the manufacture of pipeline systems for general consumption, for example: heating, water supply and gas supply to residential buildings. In addition, when it becomes necessary to make many bends, a part such as a transition tee is simply irreplaceable. This is because it makes it possible to connect to a pipe with a large diameter, for example a main one.
The welded tee is most often used, since it is easiest to adapt to pipes of standard diameter. If there is a need to make connections with pipes of large diameters, it is best to use flanged models.
Steel tee
The steel tee is used as a connecting part during the laying of small and large main oil, gas and water pipelines. It is made of anti-corrosion steel and cast iron according to several GOSTs: 17376-01, TU 102-488-95, TU 51-29-81, TU 148139-00 and is a fitting part with three holes for convenient distribution and branching along the liquid line or gas
During production, these products are divided into two categories: transition tee (flange) and straight tee (equal passage). All users registered on our website can view these and other models in special catalogs from manufacturers. In addition, you can order the part you need from us by filling out a special form.
A transition TS differs from a straight one in that its connecting holes have one diameter, and the head branch of the pipeline has a different diameter. In turn, an equal-bore steel tee has the same diameter for all connecting holes (see figure).
In addition, these connecting parts have different characteristics to expand their range of use. They differ in diameter, size, method of connection to the main line and distribution pipes, and resistance to the external environment.
Steel stamped-welded models are produced according to TU 102-488-95. For their production, steel grades 09g2s, 20, 12x18n10t are used. They are the ones that can withstand pressures of up to 2.5 MPa and temperatures from -30 to +300 degrees Celsius.
Welded tees, with a seam on the neck part, are manufactured in accordance with GOST 17376-2001. In this case, steel of other grades is provided: 09g2s, 20, 12x18n10t. For seamless products, steel 09g2s, 20, 12x18n10t is used (requirements of GOST 17376-2001). In addition, special production is provided for all sizes in accordance with GOST.
Table 1
| Steel tee, size | GOST |
| TS 57x45 | 17376-83 |
| TS 57 | 17376-83 |
| TS 76x57 | 17376-83 |
| TS 76 | 17376-83 |
| TS 89x57 | 17376-83 |
| TS 89x76 | 17376-83 |
| TS 89 | 17376-83 |
| TS 108x76 | 17376-83 |
| TS 108x89 | 17376-83 |
| TS 108 | 17376-83 |
| TS 133x89 | 17376-83 |
| TS 133x108 | 17376-83 |
| TS 133 | 17376-83 |
| TS 159x108 | 17376-83 |
| TS 159x133 | 17376-83 |
| TS 159 | 17376-83 |
| TS 219x159 | 17376-83 |
| TS 219 | 17376-83 |
| TS 273x159 | 17376-83 |
| TS 273x219 | 17376-83 |
| TS 273 | 17376-83 |
| TS 325x273 | 17376-83 |
| TS325 | 17376-83 |
Based on the method of connection, these parts are divided into welded and threaded. A welded vehicle is often connected to additional pipes, as well as to the main pipe using autogenous welding. A threaded vehicle can be connected to the main and auxiliary pipes using threads.
The fact that it is made of metal, which is least susceptible to corrosion, allows it to be used in the construction of various pipelines. In addition, such connecting products, connected to the main line using autogen welding, have very strong and sealed seams that are resistant to negative external weather and other influences.
The most harmless for the food industry is a welded model made of stainless steel. That is why it is very popular when laying water pipelines, as it has high resistance to oxidative processes. In addition, it is used in industrial pipelines of thermal power plants. This part is used on pipelines with a nominal pressure of up to 16 MPa, and the operating temperature ranges from -70 to +450°C.
In turn, a product made using a seamless method is often used in the construction of industrial pipelines in the petrochemical industry.
The weight of steel tees can also vary and ranges from 0.200 kg to 55.5 kg. Their mass varies depending on their diameter.
Thus, steel tees are considered one of the indispensable parts used in the construction of large oil and gas pipelines, as well as water pipelines. They allow distribution to smaller branches from the main line and, if used and installed correctly, can be strong and durable, without suffering from changes in weather conditions and the external environment.
Dimensions and weight of steel tees
table 2
| DN | D | T | D1 | T1 | F | H | Weight, kg |
| 15 | 21,3 | 2,0 | 21,3 | 2,0 | 25 | 25 | 0,2 |
| 20 | 26,9 | 3,2 | 26,9 | 3.2 | 29 | 29 | 0,4 |
| 25 | 33,7 | 3,2 | 33,7 | 3,2 | 38 | 38 | 0,6 |
| 32 | 42,4 | 3,6 | 42,4 | 3,6 | 48 | 48 | 1,1 |
| 40 | 3,6 | 3,6 | 48 | 3,6 | 57 | 57 | 1,4 |
| 50 | 57 | 5,0 | 45 | 4,0 | 50 | 45 | 0,7 |
| 50 | 57 | 3,0 | — | — | 50 | 45 | 0,5 |
| 50 | 57 | 5,0 | — | — | 50 | 45 | 0,7 |
| 65 | 76 | 6,0 | 45 | 5,0 | 65 | 60 | 1,4 |
| 65 | 76 | 3,5 | 57 | 3,0 | 65 | 60 | 0,8 |
| 65 | 76 | 3,5 | — | — | 65 | 60 | 0,8 |
| 65 | 76 | 6,0 | — | — | 65 | 60 | 1,4 |
| 80 | 89 | 3,5 | 57 | 3,0 | 80 | 70 | 1,5 |
| 80 | 89 | 3,5 | 76 | 3,5 | 80 | 70 | 1,5 |
| 80 | 89 | 3,5 | — | — | 80 | 70 | 1,5 |
| 80 | 89 | 6,0 | — | — | 80 | 70 | 2,0 |
| 100 | 108 | 4,0 | 76 | 3,5 | 100 | 80 | 2,2 |
| 100 | 108 | 4,0 | 89 | 4,0 | 100 | 80 | 2,2 |
| 100 | 108 | 4,0 | — | — | 100 | 80 | 2,2 |
| 100 | 108 | 6,0 | — | — | 100 | 80 | 3,3 |
| 125 | 133 | 6,0 | 89 | 5,0 | 110 | 95 | 4,1 |
| 125 | 133 | 6,0 | 108 | 5,0 | 110 | 95 | 4,1 |
| 125 | 133 | 4,0 | — | — | 110 | 95 | 2,9 |
| 125 | 133 | 6,0 | — | — | 110 | 95 | 4,1 |
| 150 | 159 | 4,5 | 108 | 4,0 | 130 | 110 | 4,8 |
| 150 | 159 | 6,0 | 108 | 5,0 | 130 | 110 | 6,6 |
| 150 | 159 | 8,0 | 133 | 6,0 | 130 | 110 | 9,0 |
| 150 | 159 | 4,5 | — | — | 130 | 110 | 4,8 |
| 150 | 159 | 6,0 | — | — | 130 | 110 | 6,6 |
| 150 | 159 | 8,0 | — | — | 130 | 110 | 9,0 |
| 200 | 219 | 8,0 | 133 | 6,0 | 160 | 140 | 13,8 |
| 200 | 219 | 8,0 | 159 | 6,0 | 160 | 140 | 13,8 |
| 200 | 219 | 6,0 | — | — | 160 | 140 | 10,2 |
| 200 | 219 | 8,0 | — | — | 160 | 140 | 13,8 |
| 250 | 273 | 10,0 | 159 | 6,0 | 190 | 175 | 26,0 |
| 250 | 273 | 10,0 | 219 | 8,0 | 190 | 175 | 26,0 |
| 250 | 273 | 7,0 | — | — | 190 | 175 | 18,4 |
| 250 | 273 | 10,0 | — | — | 190 | 175 | 26,0 |
| 300 | 325 | 10,0 | 219 | 8,0 | 220 | 200 | 34,2 |
| 300 | 325 | 10,0 | 273 | 10,0 | 220 | 200 | 34,2 |
| 300 | 325 | 8,0 | — | — | 220 | 200 | 27,4 |
| 300 | 325 | 10,0 | — | — | 220 | 200 | 34,2 |
| 300 | 325 | 12,0 | — | — | 220 | 200 | 41,1 |
| 350 | 377 | 8,0 | 273 | 7,0 | 240 | 225 | 46,0 |
| 350 | 377 | 10,0 | 325 | 8,0 | 240 | 225 | 46,0 |
| 350 | 377 | 12,0 | 325 | 10,0 | 240 | 225 | 55,2 |
| 350 | 377 | 10,0 | — | — | 240 | 225 | 46,0 |
| 350 | 377 | 12,0 | — | — | 240 | 225 | 55,2 |
| 400 | 426 | 10,0 | 325 | 8,0 | 270 | 250 | 55,5 |
| 400 | 426 | 12,0 | 325 | 10,0 | 270 | 250 | 66,7 |
| 400 | 426 | 16,0 | 325 | 12,0 | 270 | 250 | 88,8 |
| 400 | 426 | 10,0 | 377 | 10,0 | 270 | 250 | 55,5 |
| 400 | 426 | 12,0 | 377 | 12,0 | 270 | 250 | 66,7 |
| 400 | 426 | 16,0 | 377 | 16,0 | 270 | 250 | 88,8 |
| 400 | 426 | 10,0 | — | — | 270 | 250 | 55,5 |
TD "NORDSTAL" has its own production of steel tees from alloys 09G2S, 20, 12Х18Н10Т and other grades. Compliance of products with GOST 17376-2001 is confirmed by certificates.
Connecting parts of this type ensure correct connection of side branches to the main line. The catalog presents seamless transition and equal-bore fittings designed for operating pressures up to 16 MPa. The internal diameter, depending on the version, is 20–1020 mm.
Performance qualities of steel tees
The assortment includes fittings for heating networks, cold and hot water supply, gas supply, process pipelines and other utility networks. The parts are suitable for highways of any complexity, with different working environments.
In addition to versatility, steel tees have other advantages:
- strength, resistance to the formation of surface and subsurface damage;
- uniform thickness over the entire diameter (steel tees undergo mandatory control using ultrasonic flaw detection and thickness testing);
- high anti-corrosion resistance;
- resistance to temperature changes from -70 to +450 ˚С;
- high accuracy of geometric parameters.
Steel tees are always in stock in our warehouse. This allows fittings to be shipped in a short time. For speedy delivery in the Moscow region and other regions, we have our own fleet of trucks.
Prices for steel tees depend on the nominal diameter, outer diameter, steel grade, dimensions, type of connection (weld, threaded or flanged). TD "NORDSTAL" supplies products of its own production, and therefore there are no intermediary markups. The total cost is calculated taking into account current discounts.
Dimensions and parameters of tees GOST 17376-2001
| D | T | D1 | T1 | F | H | r, no less | Weight, kg |
| 45 | 2,5 4,0 5,0 | --- | --- | 40 | 40 | 5 | 0,3 0,4 0,4 |
| 57 | 3,0 4,0 5,0 | 45 | 2,5 3,0 4,0 | 50 | 45 | 5 | 0,4 0,6 0,7 |
| 3,0 4,0 5,0 | --- | --- | 0,4 0,6 0,7 |
||||
| 76 | 3,5 6,0 7,0 | 45 | 2,5 4,0 5,0 | 65 | 60 | 5 | 0,8 1,4 1,6 |
| 3,5 6,0 7,0 | 57 | 3,0 5,0 5,5 | 0,8 1,4 1,6 |
||||
| 3,5 6,0 7,0 | --- | --- | 0,8 1,4 1,6 |
||||
| 89 | 3,5 6,0 8,0 | 57 | 3,0 4,0 5,5 | 80 | 70 | 5 | 1,5 2,0 2,7 |
| 3,5 6,0 8,0 | 76 | 3,5 6,0 7,0 | 1,5 2,0 2,7 |
||||
| 3,5 6,0 8,0 | --- | --- | 1,5 2,0 2,7 |
||||
| 108 | 4,0 6,0 8,0 9,0 | 76 | 3,5 5,0 6,0 7,0 | 100 | 80 | 5 | 2,2 3,3 4,5 4,9 |
| 4,0 6,0 8,0 9,0 | 89 | 4,0 5,0 6,0 7,0 | 2,2 3,3 4,5 4,9 |
||||
| 4,0 6,0 8,0 9,0 | --- | --- | 2,2 3,3 4,5 4,9 |
||||
| 133 | 4,0 6,0 8,0 10,0 12,0 | 89 | 3,5 5,0 6,0 8,0 9,0 | 110 | 95 | 6 6 | 2,9 4,1 5,9 6,8 8,0 |
| 4,0 6,0 8,0 10,0 12,0 | 108 | 4,0 5,0 6,0 9,0 10,0 | 2,9 4,1 5,9 6,8 8,0 |
||||
| 4,0 6,0 8,0 10,0 12,0 | --- | --- | 2,9 4,1 5,9 6,8 8,0 |
||||
| 159 | 4,5 6,0 8,0 10,0 12,0 | 108 | 4,0 5,0 6,0 9,0 10,0 | 130 | 110 | 8 | 4,8 6,6 9,0 10,1 12,2 |
| 4,5 6,0 8,0 10,0 12,0 | 133 | 4,0 5,0 6,0 9,0 10,0 | 4,8 6,6 9,0 10,1 12,2 |
||||
| 4,5 6,0 8,0 10,0 12,0 | --- | --- | 4,8 6,6 9,0 10,1 12,2 |
||||
| 219 | 6,0 8,0 10,0 12,0 16,0 | 133 | 5,0 6,0 8,0 10,0 12,0 | 160 | 140 | 10 | 10,2 13,8 16,8 19,9 26,6 |
| 6,0 8,0 10,0 12,0 16,0 | 159 | 6,0 6,0 8,0 11,0 12,0 | 10,2 13,8 16,8 19,9 26,6 |
||||
| 6,0 8,0 10,0 12,0 16,0 | --- | --- | 10,2 13,8 16,8 19,9 26,6 |
||||
| 273 | 7,0 10,0 12,0 16,0 18,0 | 159 | 4,5 6,0 8,0 11,0 12,0 | 190 | 175 | 12 12 | 18,4 26,0 31,2 41,6 46,8 |
| 7,0 10,0 12,0 16,0 18,0 | 219 | 6,0 8,0 10,0 12,0 16,0 | 18,4 26,0 31,2 41,6 46,8 |
||||
| 7,0 10,0 12,0 16,0 18,0 | --- | --- | 18,4 26,0 31,2 41,6 46,8 |
||||
| 325 | 8,0 10,0 12,0 16,0 22,0 | 219 | 6,0 8,0 10,0 12,0 16,0 | 190 | 175 | 15 | 27,4 34,2 41,1 54,8 75,3 |
| 8,0 10,0 12,0 16,0 22,0 | 273 | 7,0 10,0 12,0 16,0 18,0 | 27,4 34,2 41,1 54,8 75,3 |
||||
| 8,0 10,0 12,0 16,0 22,0 | --- | --- | 27,4 34,2 41,1 54,8 75,3 |
||||
| 377 | 10,0 12,0 16,0 20,0 | 273 | 7,0 10,0 12,0 16,0 | 240 | 15 | 46,0 55,2 73,6 92,0 |
|
| 10,0 12,0 16,0 20,0 | 325 | 8,0 10,0 16,0 18,0 | 46,0 55,2 73,6 92,0 |
||||
| 10,0 12,0 16,0 20,0 | --- | --- | 46,0 55,2 73,6 92,0 |
||||
| 426 | 10,0 12,0 16,0 18,0 | 325 | 8,0 10,0 12,0 16,0 | 270 | 250 | 18 | 55,5 66,6 88,8 100,0 |
| 10,0 12,0 16,0 18,0 | 377 | 10,0 12,0 16,0 18,0 | 55,5 66,6 88,8 100,0 |
||||
| 10,0 12,0 16,0 18,0 | --- | --- | 55,5 66,6 88,8 100,0 |
Seamless welded tees GOST 17376-2001
The main purpose of steel seamless tees is to connect various side branches to the pipeline. The connection is made by conventional butt welding along the end parts of the tee. The document according to GOST 17376-01 standards very well describes the design of various sizes of welded seamless tees made of low-alloy and carbon steel. The GOST 17380-2001 standard contains a description of the requirements for various seamless parts; there are also tees with pressures up to Ru160 (PN16 MPa).
Description of the technology for manufacturing seamless tees according to GOST 17376-01 standard
A piece of pipe is used as a blank for future tees; Serial production of tees according to GOST 17376-01 is carried out using the hydraulic stamping method. After installing and fixing the workpiece (pipe) in the press, the process of stamping a new tee is carried out. After pressing, the end of the branch was removed, and the workpieces underwent thermal normalization to relieve internal stresses that were excessive and occurred during deformation under pressure.
Design features of the tee according to GOST 17376-01 standard
Seamless tees are divided into transitional (unequal bore) and equal bore in their design. For unequal tees, the branch side will always be smaller in diameter than the main line of the tee, while for equal bore tees, the diameter of the branch side and the diameters of the main line are always the same. If you look at GOST 17376-01, and more specifically at paragraphs 4.1 and the entire 5 section, you can see that there are clear requirements for the size and design of these tees. Compliance with the standard for the height of the tee, its length and the thickness of the wall that will be connected is a prerequisite for the manufacture of seamless tees. There are manufacturers who produce tees based on their technical conditions (according to specifications), which have a geometry that is similar to the requirements described in the GOST 17376-01 standard, however, you should pay attention to the fact that very often their neck height “H” is less required in GOST.
You should also pay attention to the fact that the higher the diameter of the tee, the less pressure it can withstand. According to the standards described in GOST 17380-2001: the permissible nominal pressure is determined by strength calculations, that is, a Dn50 tee with a diameter of 57 mm and a connecting wall of 5 mm is designed for a nominal pressure of 10 MPa, and a Dn 200 tee (with parameters 219 × 10 mm) only at a pressure of 4 MPa.
Loading...