The state standard of the union cf. State standard of the Union of the USSR Gost 8946 75
squares, as a rule, are made by the following method: a pipe of the required diameter is taken, then a segment of the required length is cut off from it, on special equipment this segment is bent into a corner, with an angle of rotation of 90 or 45 degrees, inside which a thread is subsequently cut. squares used to connect water and gas pipes , in heating systems, plumbing, gas pipeline and other systems operating in non-aggressive environments (water, saturated steam, combustible gas, etc.). In the figure below, you can see how schematically they look squares:
Squares:
squares They are a part in the form of a branch with an angle of rotation of 90 or 45 degrees with a thread inside. carving squares cut into lathe with a cutter. squares there are two types: squares and transitional elbows. Lead-in elbows are used when the diameters of the pipes connected to each other are equal, and transition angles are used when the diameters of the pipes connected to each other are different. squares are used with the use of a sealant, at a medium temperature not higher than 175 ° C and a pressure not higher than 1.6 MPa. squares manufactured according to the following regulatory documents:
- Elbows according to GOST 8946-75 (ductile iron squares)
- Elbows according to GOST 8947-75 (transitional ductile iron elbows)
squares, depending on which normative document they are made GOST 8946-75 or GOST 8947-75), may have different parameters and execution. Below you can see the versions and parameters squares made according to these documents:
Elbows according to GOST 8946-75:
Elbows according to GOST 8946-75 can be made in 2 versions, each of which can be made with a rotation angle of 90 and 45 degrees. In the figure below, you can see how the execution data looks schematically:
As can be seen from the schematic diagram above, squares according to GOST 8946-75 are checkpoints, i.e. their inlet and outlet diameters are equal. Elbows according to GOST 8946-75 galvanized grommets) or uncoated. Diameter squares according to GOST 8946-75 varies from DN 8mm to DN100mm. You can see the parameters in the table below. cast-iron elbows, made according to GOST 8946-75:
| Conditional pass D | Thread d | L | L1 | ||
|---|---|---|---|---|---|
| Option according to GOST 8944-75 | |||||
| 1 | 2 | ||||
| 8 | G 1/4 - B | 21 | 28 | 0,042 | 0,045 |
| 10 | G 1/8 - B | 25 | 32 | 0,059 | 0,064 |
| 15 | G 1/2 - B | 28 | 37 | 0,094 | 0,103 |
| 20 | G 1/4 - B | 33 | 43 | 0,146 | 0,152 |
| 25 | G 1 - B | 38 | 52 | 0,229 | 0,241 |
| 32 | G 1 1/4 - B | 45 | 60 | 0,352 | 0,351 |
| 40 | G 1 1/2 - B | 50 | 65 | 0,494 | 0,438 |
| 50 | G 2 - B | 58 | 74 | 0,790 | 0,720 |
| (65) | G 2 1/2 - B | 69 | 88 | 1,141 | 1,030 |
| (80) | G 3 - B | 78 | 98 | 1,521 | 1,409 |
| (100) | G 4 - B | 96 | - | 3,079 | 2,680 |
squares according to GOST 8946-75:
Passing elbow with an angle of 45 degrees, version 1, uncoated with Dу=40mm:
Elbow 45gr-1-40 GOST 8946-75
Passing elbow with an angle of 90 degrees, version 2, zinc coated with Dу=50mm:
Elbow 90gr-2-Ts-50 GOST 8946-75
Elbows according to GOST 8947-75:
Elbows according to GOST 8947-75 can be made in 2 versions, each of which can be made with a rotation angle of 90 degrees. In the figure below, you can see how the execution data looks schematically:
As can be seen from the schematic diagram above, squares according to GOST 8947-75 are transitional, i.e. their inlet and outlet diameters are different. Elbows according to GOST 8947-75 can be made of malleable cast iron, galvanized ( galvanized transition brackets) or uncoated. Diameter squares according to GOST 8947-75 varies from DN 8mm to DN 65mm. You can see the parameters in the table below. cast iron transitional elbows, made according to GOST 8947-75:
| Nominal passage D y *D y1 | Thread | L | L1 | L2 | Uncoated weight, kg, max* | ||
|---|---|---|---|---|---|---|---|
| d | d1 | Option according to GOST 8944-75 | |||||
| 1 | 2 | ||||||
| 10x8 | G 3/8 - B | G 2/4 - B | 23 | 23 | - | 0,052 | 0,058 |
| 15x10 | G 1/2 - B | G 3/8 - B | 26 | 26 | 33 | 0,077 | 0,084 |
| 20x10 | G 3/4 - B | G 3/8 - B | 28 | 28 | - | 0,103 | 0,111 |
| 20x15 | G 3/4 - B | G 1/2 - B | 30 | 31 | 40 | 0,134 | 0,148 |
| 25x15 | G 1 - B | G 1/2 - B | 32 | 34 | - | 0,173 | 0,193 |
| 25x20 | G 1 - B | G 3/4 - B | 35 | 36 | 46 | 0,204 | 0,228 |
| 32x15 | G 1 1/4 - B | G 1/2 - B | 34 | 38 | - | 0,234 | 0,261 |
| 32x20 | G 1 1/4 - B | G 3/4 - B | 36 | 41 | - | 0,260 | 0,289 |
| 32x25 | G 1 1/4 - B | G 1 - B | 40 | 42 | 56 | 0,321 | 0,364 |
| 40x25 | G 1 1/2 - B | G 1 - B | 42 | 46 | - | 0,415 | 0,468 |
| 40x32 | G 1 1/2 - B | G 1 1/4 - B | 46 | 48 | - | 0,459 | 0,515 |
| 50x40 | G 2 - B | G 1 1/2 - B | 52 | 55 | - | 0,598 | 0,669 |
| 65x50 | G 2 1/2 - B | G 2 - B | 61 | 66 | - | 0,794 | 0,855 |
Below is an example of a conditional squares according to GOST 8947-75.
20 Mar
State standard GOST 8946-75* (ST SEV 3298-81) “Ductile iron fittings with straight thread for pipelines. Angles are passable. Basic Dimensions” entered into force on January 1, 1977. This document is highly specialized and contains only information on the main dimensions of such pipeline fittings as elbows. However, the data of GOST 8946-75* can be considered exhaustive and do not require additional search for other regulatory and legal acts and documents.
The standard contains the necessary drawings of the through angles and their dimensions in mm, presented in tabular form. Examples are given symbols to optimize the process of working with pipeline fittings.
METAL PIPES
AND CONNECTING PARTS
TO THEM
FERROUS AND ALLOY PIPES
MOLDED AND CONNECTING PARTS TO THEM.
BASIC DIMENSIONS.
TECHNOLOGICAL TEST METHODS
PIPE
GOST
8946-75*
(ST SEV 3298-81)
IPK STANDARDS PUBLISHING HOUSE
STATE STANDARD OF THE UNION OF THE SSR
| CAST IRON FITTINGS WITH CYLINDRICAL THREAD FOR PIPELINES. ELBOWS Main dimensionsDuctile iron and steel fittings with parallel thread for pipelines. Union passage elbews. basic dimensions. | GOST 8946-75* (CT SEV 3298-81) Instead GOST8946-59 |
By the Decree of the State Committee of Standards of the Council of Ministers of the USSR dated November 14, 1975 No. 2901, the introduction date was set
The validity period was removed according to the protocol of the Interstate Council for Standardization, Metrology and Certification (IUS 2-93)
This International Standard applies to 90° and 45° ductile iron straight threaded elbows for pipelines.
The standard fully complies with CT SEV 3298-81.
(Introduced additionally, Amendment No. 2).
- la. Elbows with an angle of 90° must be made in two versions:
1 - with internal thread;
2 - with external thread.
- The main dimensions of the squares with an angle of 90 ° must correspond to those indicated in Fig. 1 and in table. one.
Version 1
Execution 2
Table 1
Dimensions in mm
| Conditional | Uncoated weight, kg, max* | ||||
| pass | Thread d | L | L1 | Option according to GOST 8944-75 | |
| Do | 1 | 2 | |||
| 8 | G ј - B | 21 | 28 | 0,042 | 0,045 |
| 10 | G 3/8 - B | 25 | 32 | 0,059 | 0,064 |
| 15 | G S - B | 28 | 37 | 0,094 | 0,103 |
| 20 | G * - B | 33 | 43 | 0,146 | 0,152 |
| 25 | G 1 - B | 38 | 52 | 0,229 | 0,241 |
| 32 | G 1ј - B | 45 | 60 | 0,352 | 0,351 |
| 40 | G 1S - B | 50 | 65 | 0,494 | 0,438 |
| 50 | G 2 - B | 58 | 74 | 0,790 | 0,720 |
| (65) | G 2S - B | 69 | 88 | 1,141 | 1,030 |
| (80) | G 3 - B | 78 | 98 | 1,521 | 1,409 |
| (100) | G 4 - B | 96 | - | 3,079 | 2,680 |
* Reference
Notes:
- Elbows with Dy indicated in brackets in the table are not recommended.
- The mass of galvanized connecting parts should not exceed the mass of non-galvanized ones by more than 5%.
Legend Examples
90° elbow, version 1 uncoated with DN = 40 mm:
Elbow 90°- 1-40 GOST 8946- 75
The same with zinc coating:
Elbow 90°-1-Ts-40 GOST 8946-75.
(Changed edition, Rev. No. 1, 2).
1b. Elbows with an angle of 45 ° must be made in two versions:
1 - with internal thread;
2 - with external thread.
1c. The main dimensions of the square with an angle of 45 ° must correspond to those indicated in Fig. 2 and in table. 2.
Version 1
Execution 2
Note. The drawing does not define the design of the square.
table 2
Dimensions in mm
Legend Examples
Angle 45° version 1 uncoated with DN = 40 mm:
Elbow 45°- 1-40 GOST 8946-75
The same with zinc coating:
Elbow 45°-1-Ts-40 GOST 8946-75.
(Introduced additionally, Amendment No. 2).
- Structural dimensions and technical requirements- according to GOST 8944-75.
METAL PIPES
AND CONNECTING PARTS
TO THEM
Part 4
FERROUS AND ALLOY PIPES
MOLDED AND CONNECTING PARTS TO THEM.
BASIC DIMENSIONS.
TECHNOLOGICAL TEST METHODS
PIPE
GOST
8946-75*
(ST SEV 3298-81)
Moscow
IPK STANDARDS PUBLISHING HOUSE
1998
STATE STANDARD OF THE UNION OF THE SSR
|
CAST IRON FITTINGS ANGLES Main dimensions Ductile iron and steel fittings with |
GOST 8946-75* Instead |
By the Decree of the State Committee of Standards of the Council of Ministers of the USSR dated November 14, 1975 No. 2901, the introduction date was set
01.01.77
The validity period was removed according to the protocol of the Interstate Council for Standardization, Metrology and Certification (IUS 2-93)
This International Standard applies to 90° and 45° ductile iron straight threaded elbows for pipelines.
The standard fully complies with CT SEV 3298-81.
(Introduced additionally, rev. № 2).
la . Elbows with an angle of 90° must be made in two versions:
1 - with internal thread;
2 - with external thread.
1. The main dimensions of the 90° angles must be as indicated on and in.
Version 1 Version 2
D
G 1 / 4 - B
G 3/8 - B
G 1 / 2 - B
G 3 / 4 - B
G 1 - B
G 1 1 / 4 - B
* Reference
Notes:
1. Squares with D , indicated in brackets in the table are not recommended.
2. The weight of galvanized fittings must not exceed the weight of non-galvanized parts by more than 5%.
Legend Examples
90° elbow, version 1 uncoated with D y = 40 mm:
Elbow 90°- 1-40 GOST 8946- 75
The same with zinc coating:
Elbow 90°-1-Ts-40 GOST 8946-75.
(Revised edition, Rev. № 1, 2) .
1b. Elbows with an angle of 45 ° must be made in two versions:
1 - with internal thread;
2 - with external thread.
1c. The main dimensions of the 45° elbow must correspond to those indicated on and in
Version 1 Version 2
Note. The drawing does not define the design of the square.
Dimensions in mm
|
Conditional passage D at |
Thread d |
L |
|
G 1 / 8 - B |
|||
Legend Examples
45° elbow, version 1 uncoated with D y = 40 mm:
Elbow 45°- 1-40 GOST 8946-75
The same with zinc coating:
Elbow 45°-1-Ts-40 GOST 8946-75.
(Introduced additionally, Amendment No. 2).
2. Structural dimensions and technical requirements - according to .
GOST 8946-75
Group B61
INTERSTATE STANDARD
DUCTE IRON CONNECTIONS WITH CYLINDRICAL THREAD FOR PIPELINES. ANGLES
Main dimensions
Ductile iron and steel fittings with parallel thread for pipelines. Union passage elbews. basic dimensions.
ISS 23.040.60
Introduction date 1977-01-01
By the Decree of the State Committee of Standards of the Council of Ministers of the USSR dated 11.14.75 N 2901, the introduction date was set as 01.01.77
The validity period was removed according to protocol N 2-92 of the Interstate Council for Standardization, Metrology and Certification (IUS 2-93)
INSTEAD OF GOST 8946-59
EDITION (September 2010) with Amendments No. 1, 2, approved in September 1980, March 1983 (IUS 11-80, 7-83)
This International Standard applies to 90° and 45° ductile iron straight threaded elbows for pipelines.
The standard fully complies with CT SEV 3298-81.
(Introduced additionally, Rev. N 2).
1a. Elbows with an angle of 90° must be made in two versions:
1 - with internal thread;
2 - with external thread.
1. The main dimensions of the squares with an angle of 90 ° must correspond to those indicated in Fig. 1 and in Table 1.
Version 1
Execution 2
Table 1
Dimensions in mm |
|||||
Conditional pass | Uncoated weight, kg, max* |
||||
________________
* Reference
Notes:
1. Squares with, indicated in the table in brackets, are not recommended.
2. The mass of galvanized connecting parts should not exceed the mass of non-galvanized ones by more than 5%.
Legend Examples
90° swivel elbow version 1 uncoated with =40 mm:
Elbow 90°-1-40 GOST 8946-75
The same with zinc coating:
Elbow 90°-1-Ts-40 GOST 8946-75 .
(Changed edition, Rev. N 1, 2).
1b. Elbows with an angle of 45 ° must be made in two versions:
1 - with internal thread;
2 - with external thread.
1c. The main dimensions of the square with an angle of 45 ° must correspond to those indicated in Fig. 2 and in Table 2.
Version 1
Execution 2
Note. The drawing does not define the design of the square.
table 2
Dimensions in mm |
|||
Conditional pass | |||
Legend Examples
45° elbow, version 1 uncoated with =40 mm:
Elbow 45°-1-40 GOST 8946-75
The same with zinc coating:
Elbow 45°-1-Ts-40 GOST 8946-75.
(Introduced additionally, Rev. N 2).
2. Structural dimensions and technical requirements - according to GOST 8944-75.
Electronic text of the document
prepared by CJSC "Kodeks" and checked against:
official publication
Pipes metal and connecting
parts for them. Part 4. Black pipes
metals and alloys cast and connecting
parts for them. Main dimensions. Methods
technological testing of pipes:
Collection national standards. -
M.: Standartinform, 2010
| Document's name: | |
| Document Number: | 8946-75 |
| Document type: | GOST |
| Host body: | State Standard of the USSR |
| Status: | current |
| Published: | official publication |
| Acceptance date: | November 14, 1975 |
| Effective start date: | January 01, 1977 |
| Revision date: | 01 September 2010 |
GOST 8946-75
Group B61
INTERSTATE STANDARD
DUCTE IRON CONNECTIONS WITH CYLINDRICAL THREAD FOR PIPELINES. ANGLES
Main dimensions
Ductile iron and steel fittings with parallel thread for pipelines. Union passage elbews. basic dimensions.
ISS 23.040.60
Introduction date 1977-01-01
By the Decree of the State Committee of Standards of the Council of Ministers of the USSR dated 11.14.75 N 2901, the introduction date was set as 01.01.77
The validity period was removed according to protocol N 2-92 of the Interstate Council for Standardization, Metrology and Certification (IUS 2-93)
INSTEAD OF GOST 8946-59
EDITION (September 2010) with Amendments No. 1, 2, approved in September 1980, March 1983 (IUS 11-80, 7-83)
This International Standard applies to 90° and 45° ductile iron straight threaded elbows for pipelines.
The standard fully complies with CT SEV 3298-81.
(Introduced additionally, Rev. N 2).
1a. Elbows with an angle of 90° must be made in two versions:
1 - with internal thread;
2 - with external thread.
1. The main dimensions of the squares with an angle of 90 ° must correspond to those indicated in Fig. 1 and in Table 1.
Version 1
Execution 2
Table 1
Dimensions in mm |
|||||
Conditional pass | Uncoated weight, kg, max* |
||||
________________
* Reference
Notes:
1. Squares with, indicated in the table in brackets, are not recommended.
2. The mass of galvanized connecting parts should not exceed the mass of non-galvanized ones by more than 5%.
Legend Examples
90° swivel elbow version 1 uncoated with =40 mm:
Elbow 90°-1-40 GOST 8946-75
The same with zinc coating:
Elbow 90°-1-Ts-40 GOST 8946-75 .
(Changed edition, Rev. N 1, 2).
1b. Elbows with an angle of 45 ° must be made in two versions:
1 - with internal thread;
2 - with external thread.
1c. The main dimensions of the square with an angle of 45 ° must correspond to those indicated in Fig. 2 and in Table 2.
Version 1
Execution 2
Note. The drawing does not define the design of the square.
table 2
Dimensions in mm |
|||
Conditional pass | |||
Legend Examples
45° elbow, version 1 uncoated with =40 mm:
Elbow 45°-1-40 GOST 8946-75
The same with zinc coating:
Elbow 45°-1-Ts-40 GOST 8946-75.
(Introduced additionally, Rev. N 2).
2. Structural dimensions and technical requirements - according to GOST 8944-75.
Electronic text of the document
prepared by CJSC "Kodeks" and checked against:
official publication
Pipes metal and connecting
parts for them. Part 4. Black pipes
metals and alloys cast and connecting
parts for them. Main dimensions. Methods
technological testing of pipes:
Collection of national standards. -
M.: Standartinform, 2010
GOST 8946-75. Ductile iron fittings with cylindrical threads for pipelines. Angles are passable. Basic dimensions (with Changes N 1, 2)
| Document's name: | |
| Document Number: | 8946-75 |
| Document type: | GOST |
| Host body: | State Standard of the USSR |
| Status: | current |
| Published: | official publication Pipes metal and connecting parts to them. Part 4. Pipes made of ferrous metals and alloys, cast and connecting parts to them. Main dimensions. Methods for technological testing of pipes: Collection of national standards. - M.: Standartinform, 2010 |
| Acceptance date: | November 14, 1975 |
| Effective start date: | January 01, 1977 |
| Revision date: | 01 September 2010 |
