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GB/T 36019-2018: Specification for grooved pipe fittings
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Specification for grooved pipe fittings
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GB/T 36019-2018
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Basic data | Standard ID | GB/T 36019-2018 (GB/T36019-2018) | | Description (Translated English) | Specification for grooved pipe fittings | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J15 | | Classification of International Standard | 23.040.60 | | Word Count Estimation | 50,586 | | Date of Issue | 2018-03-15 | | Date of Implementation | 2018-10-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 36019-2018: Specification for grooved pipe fittings---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Specification for grooved pipe fittings
ICS 23.040.60
J15
National Standards of People's Republic of China
Grooved pipe joints technical specification
Published on.2018-03-15
2018-10-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Content
Foreword I
1 Scope 1
2 Normative references 1
3 Terms and Definitions 2
4 Product model and mark 2
5 Material 6
6 Structure type and size 7
7 Surface requirements 7
8 thread 8
9 Performance requirements 8
10 Test method 9
11 type test 14
12 Factory inspection 15
13 packaging mark 15
14 Packaging, transport and storage 15
Appendix A (normative appendix) Grooved pipe fittings size 16
Appendix B (informative) Recommended structural dimensions for grooved fittings 19
Appendix C (Normative) End Groove Size 41
Appendix D (informative) Principle of load bearing calculation 45
Appendix E (informative) The principle of calculating the angle of the mechanical three-way axis 46
Reference 47
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Machinery Industry Federation.
This standard is under the jurisdiction of the National Pipeline Standardization Technical Committee (SAC/TC237).
This standard is drafted by. Meide Group Co., Ltd., China Machine Productivity Promotion Center, Shanghai Wesson Machinery Connector Co., Ltd.,
Hairuifu Pipeline System Co., Ltd., Hebei Jianzhi Foundry Group Co., Ltd., Lianyungang Oriental Pipe Fittings Manufacturing Co., Ltd., Shandong Ryder Machine
Machinery Co., Ltd., Shandong Yihaotong Machinery Co., Ltd., Shandong Dingliang Fire Technology Co., Ltd., Weifang Changsheng Pipe Industry Co., Ltd.
The main drafters of this standard. Feng Feng, Kong Linglei, Zhang Ju, Li Junying, Fang Lujun, Yuan Yong, Li Guolin, Zhou Jinggang, Ren Yanqing, Zhang Tonghu,
Chen Renjun, Liang Shudong, Zhao Xuelong.
Grooved pipe joints technical specification
1 Scope
This standard specifies the type and size, technical requirements, test methods and inspections of grooved pipe joints (hereinafter referred to as "grooved pipe fittings").
Rules, signs, packaging, transportation and storage.
This standard applies to the rated working pressure is not more than 2.5MPa, the nominal size is DN25~DN600, the temperature range is -20 °C~
Grooved pipe connections for piping systems such as water supply and drainage, fire protection, and air conditioning at 180 °C.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 231.1 Test methods for Brinell hardness of metallic materials - Part 1
GB/T 231.2 Test methods for Brinell hardness of metallic materials - Part 2. Examination and calibration
GB/T 528 Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber
Rubber and rubber -- Determination of hardness of indented rubbers -- Part 1 . Shore hardness test method ( Shore hardness )
Vulcanized rubber or thermoplastic rubber - Determination of hardness - Part 2. Portable rubber international hardness test method
GB/T 1348 ductile iron castings
GB/T 1690 vulcanized rubber or thermoplastic rubber liquid test method (GB/T 1690-2010, ISO 1817.2005,
MOD)
GB/T 2828.1. Sampling and sampling procedures - Part 1 . Batch-to-batch sampling plan searched by the acceptance quality limit (AQL)
GB/T 3098.1 Mechanical properties of fasteners, bolts, screws and studs (GB/T 3098.1-2010, ISO 898-1.2009,
MOD)
GB/T 3098.2 fastener mechanical properties nut
GB/T 3287 malleable cast iron pipe joint
GB/T 3512 rubber hot air aging test method
GB 5135.11 Automatic sprinkler systems - Part 11. Grooved fittings
GB/T 5267.3 fastener hot dip galvanized layer
General provisions for marking, packaging, transportation and storage of GB/T 5721 rubber sealing products
GB/T 7306.1 55° sealed pipe thread Part 1. cylindrical internal and conical external threads (GB/T 7306.1-2000, eqv
ISO 7-1.1994)
GB/T 7306.2 55° sealed pipe threads Part 2. Conical internal and conical external threads (GB/T 7306.2-2000, eqv
ISO 7-1.1994)
Rubber and rubber -- Determination of compression set - Part 1 . normal temperature and temperature conditions
Rubber and rubber products -- Determination of compression set - Part 2. Under low temperature conditions
GB/T 9441 Ductile Iron Metallographic Examination
GB/T 11352 cast carbon steel for general engineering
GB/T 12716 60° sealed pipe thread
General technical conditions for GB/T 13384 mechanical and electrical product packaging
General technical requirements for GB/T 16938 fastener bolts, screws, studs and nuts (GB/T 16938-2008, ISO 8992.
2005, IDT)
GB/T 21873 Specification for interface seals for rubber seals, drains and sewers
GB/T 23658 Elastomeric seals for pipes and fittings for the transport of gaseous fuels and hydrocarbon liquids
GB/T 27572 Rubber seals 110 ° C hot water supply pipe pipe joint seal material specification
GB/T 28604 Rubber seals for drinking water pipeline systems
HG/T 2181 acid and alkali resistant rubber seal material
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Test piece testarticle
A grooved pipe joint test product for joining one or several zero parts.
3.2
Test component testassembly
A test piping system consisting of one or more test pieces assembled with a zero (part) piece such as a steel pipe.
4 Product model and marking
4.1 Product Type and Code
The code number of the grooved pipe fittings is recommended in two ways, which are determined by the enterprise. The type and code are shown in Table 1.
Table 1 Type and code
Type category code model description
Elbow
schematic diagram
Product name 90° elbow 45° elbow 22.5° elbow 11.25° elbow
Recommended code 1
Type I. 01
Type II. 01S
Type III. 01X
Type I. 02
Type II. 02S
Type III. 02X
Type I. 10
Type II. 10X
Recommended code 2
Type I. 90
Type II. 90S
Type III. 90X
Type I. 120
Type II. 120S
Type III. 120X
Type I. 110
Type II. 110X
Type I. long
Type II. Standard type
Type III. short type
Table 1 (continued)
Type category code model description
Three-way class
schematic diagram
Product name is three-way reducer tee
Branch pipe threaded
Reducing tee
Recommended code 1
Type I. 03
Type II. 03S
Type III. 03X
Type I. 04
Type II. 04S
Type I. 04T
Type II. 04TS
Recommended code 2
Type I. 130
Type II. 130S
Type III. 130X
Type I. 130R
Type II. 130RS
Type I. 131R
Type II. 131RS
Type I. long
Type II. Standard type
Type III. short type
Four-way class
schematic diagram
Product name is four-way reducer cross
Branch pipe threaded
Reducing cross
Recommended code 1
Type I. 05
Type II. 05S
Type III. 05X
Type I. 05R
Type II. 05RS
Type I. 05T
Type II. 05TS
Recommended code 2
Type I. 180
Type II. 180S
Type III. 180X
Type I. 180R
Type II. 180RS
Type I. 181R
Type II. 181RS
Type I. long
Type II. Standard type
Type III. short type
size
Head class
schematic diagram
Product name concentric size head
Groove/internal thread
Concentric size
Recommended code 1
Type I. 07
Type II. 07S
Type I. 07T
Type II. 07TS
Recommended code 2
Type I. 240
Type II. 240S
Type I. 240N
Type II. 240NS
Type I. long
Type II. Standard type
Table 1 (continued)
Type category code model description
Blind film
schematic diagram
Product name blind eccentric blind
Recommended code 1 06 06E
Recommended code 2 300 300PX
Monolithic method
Blue
schematic diagram
product name
Single piece flange
PN10
Single piece flange
PN16
Single piece flange
PN25
Single piece flange
CLASS150
Recommended code 1 09 09 09 09
Recommended code 2 321L 321 321H 321A
Neck method
Blue
schematic diagram
product name
With neck flange
PN10
With neck flange
PN16
With neck flange
PN25
With neck flange
CLASS150
Recommended code 1 08 08 08 08
Recommended code 2 321G10 321G 321GH 321GA
Mechanical three
General class
schematic diagram
Product name Threaded mechanical three-way grooved mechanical tee
U-bolt
Mechanical tee
Recommended code 1
Type I. 3S
Type II. 3JS
Type I. 3
Type II. 3GS
3U
Recommended code 2
Type I. 3J
Type II. 3JS
Type I. 3G
Type II. 3GS
3L
Type I. long
Type II. Standard type
Note. Type I, Type II, and Type III are different in size, and those not marked are standard.
4.2 Product Marking
4.2.1 Marking content
Product name code (according to Table 1)
Specification size (expressed by the outer diameter of the pipe end mm)
×□
Connection method (grooved connection, marked outer diameter of the pipe end; threaded connection,
Mark the thread code; no thread is not marked)
Rated working pressure (MPa)
4.2.2 Tag example
Example 1.
The outer diameter of the pipe end is 114.3mm, and the 90° elbow with a rated working pressure of 1.6MPa is marked as. 01-114.3-1.6 or 90-114.3-1.6
Example 2.
The pipe main pipe has an outer diameter of 114.3mm, a side outlet of 55° 1′′ pipe thread, and a rated working pressure of 1.6MPa. The threaded mechanical tee is marked as. 3S-114.3
×Rc1-1.6 or 3J-114.3×Rc1-1.6
4.2.3 Supplementary description of the mark
4.2.3.1 The same diameter grooved pipe fittings, that is, all outlets have the same specifications and are classified into one specification.
4.2.3.2 Reducing grooved pipe fittings with two outlet ends shall be expressed in the order of the size of the outlet specification. large size × small size.
4.2.3.3 Reducing three-way grooved pipe fittings, the main pipe specifications are the same, and the pipe pipe specifications are smaller than the main pipe specifications, according to the main specification,
The pipe specification is expressed as. main specification × branch pipe specification.
4.2.3.4 Mechanical three-way grooved pipe fittings with side outlets shall be marked according to the specifications of the main pipe and the specifications of the branch pipe.
Branch pipe specifications.
4.3 Product Mark
4.3.1 Shell logo
The grooved pipe fittings shall be clearly and permanently marked in the following positions.
a) the name or trademark of the production unit;
b) product name code;
c) size and specifications;
d) rated working pressure (added according to certification requirements);
e) National mandatory requirements, contractual requirements or other markings added by the manufacturer.
4.3.2 Seal mark
The following parts should be clearly and permanently marked on the seal.
a) the name or trademark of the production unit;
b) model specifications;
c) seal material code, see Table 2;
d) Year of production.
Table 2 seal material code
Material nitrile rubber ethylene propylene rubber silicone rubber fluoro rubber neoprene other materials
Codename DESFV corresponding code
5 materials
5.1 housing
5.1.1 Common materials for grooved pipe fittings are shown in Table 3. According to customer requirements, other not less than ductile iron (QT450-10) tensile strength can also be used.
Degree and corrosion resistant materials, but should meet the requirements of the corresponding national standards.
Table 3 Common materials for grooved pipe fittings
Material standard number common grade
Ductile iron GB/T 1348 QT450-10, QT500-7
Cast steel GB/T 11352 ZG270-500
5.1.2 When casting with ductile iron, the spheroidization grade of graphite shall not be lower than the level 3 specified in GB/T 9441.
5.1.3 When the end tube is processed separately, its material properties are not lower than the requirements of the main pipe, and the welding performance requirements shall be met.
5.2 bolts and nuts
The mechanical properties of the bolts shall not be lower than the requirements of 8.8 specified in GB/T 3098.1; the mechanical properties of the nuts shall not be lower than those in GB/T 3098.2.
The specified level 8 requirements.
5.3 Rubber seals
According to the different pipeline transportation media, the applicable scope and related standards of rubber seals should meet the requirements of Table 4.
Table 4 Common materials for rubber seals, recommended application media, temperature range and related standards
Material name related standard recommended application medium recommended application temperature range
EPDM
GB 5135.11, GB/T 21873
Water supply, drainage, sewage and
Normal temperature air, weak acid and weak base
GB/T 27572 continuous supply of 110 ° C hot water
-30°C~ 130°C
Nitrile rubber GB 5135.11, GB/T 23658 petroleum base oil -20 ° C ~ 80 ° C
Silicone Rubber
GB/T 28604 drinking water
GB 5135.11
High temperature dry air and one
Some high temperature chemicals
-40°C~ 180°C
Fluororubber HG/T 2181 acid, alkali solution, hot lubricating oil -20 ° C ~ 180 ° C
Neoprene - seawater -20 ° C ~ 100 ° C
6 Structure type and size
6.1 Structural dimensions
See Appendix A and Appendix B for the structural type and dimensions of the grooved pipe fittings.
6.2 Tube end groove size
6.2.1 The dimensions of the rolling groove are given in Table C.1 of Appendix C.
6.2.2 The dimensions of the cutting groove are specified in Table C.2 of Appendix C.
6.2.3 The dimensions of the casting groove are as specified in Table C.3 of Appendix C.
6.3 Tolerance
6.3.1 Dimensional tolerances of structural lengths L, L1, L2
The dimensional tolerances of the structural lengths L, L1, and L2 are shown in Table 5.
Table 5 Dimensional tolerance of the structural length is in millimeters
Structure length
L, L1, L2
≤30
>30~
≤50
>50~
≤75
>75~
≤100
>100~
≤150
>150~
≤200
>200
Tolerance ±1.5 ±2.0 ±2.5 ±3.0 ±3.5 ±4.0 ±5.0
6.3.2 Angle tolerance
6.3.2.1 The angle between the end face of the groove and the end face is ±1°.
6.3.2.2 The tolerance of the mechanical three-way thread axis is ±0.5°.
7 Surface requirements
7.1 The surface of the grooved pipe fittings shall be smooth and smooth, and defects such as pores, blisters, slag inclusions, cold partitions, shrinkage holes, cracks, and depressions that affect performance may not be permitted.
There are no defects such as protrusions and depressions in the casting groove. There are no processing defects and bump damage in the grooved pipe processing parts. The logo is clearly legible.
7.2 The surface of the grooved pipe fittings shall be treated with anti-corrosion treatment by dip coating, spray coating or hot-dip galvanizing.
a) Paint layer. It should be uniform, smooth and firm, without paint, accumulation, and paint leakage. The thickness of the paint layer is not less than 25.4μm, and the lead content of the paint layer is less than
0.009%.
b) Plastic layer. It should be uniform, continuous, smooth and firm, and should not be flammable when applied to fire protection systems. The thickness of the plastic layer is not less than 40 μm.
c) Hot-dip galvanized layer. The zinc layer on the surface of the galvanized grooved pipe should be uniform, continuous and smooth, and there should be no defects such as zinc leakage, zinc layer peeling and black spots;
The contact surface of the rubber ring/pad is not allowed to have zinc, zinc dross, zinc deposits and other appendages, and the zinc layer contains no more than 0.1% lead. Minimum zinc layer
The thickness is 63 μm.
7.3 Bolts and nuts shall be treated with anti-corrosion treatment such as hot-dip galvanizing and electro-galvanizing.
a) Electroplated zinc. The plating layer has a bright luster, and the zinc layer is uniform and complete, and there must be no zinc leakage and rust spots on the part, and the thickness of the zinc layer is not small.
At 8 μm.
b) Hot dip galvanizing. Hot-dip galvanizing should meet the requirements of GB/T 5267.3, the surface should be smooth, no leakage plating, zinc, black spots, no residue
Solvent slag, scale inclusions and other defects that impair the intended performance of the part. The thickness of the zinc layer is not less than 40 μm.
8 thread
8.1 55° sealing pipe thread should meet the requirements of GB/T 7306.1 or GB/T 7306.2, 60° sealing pipe thread should comply with GB/T 12716
Provisions. When the customer needs 60° sealing pipe thread, it should be stated in the contract.
8.2 Threads should be rust-proof, and rust-proof materials should not contain polycyclic aromatic hydrocarbons.
8.3 The technical conditions of bolts and nuts shall comply with the provisions of GB/T 16938.
9 Performance requirements
9.1 Air sealing performance
When the inflation pressure reaches 0.5 MPa, the test piece shall have no bubble leakage on the surface of the test piece.
9.2 Sealing performance
Test component internal test pressure requirements. nominal size ≤ DN300, should be 2 times rated working pressure; DN300 < nominal size ≤
DN600 shall be 1.5 times the rated working pressure; the surface of the test piece shall be free of leakage.
9.3 Pressure resistance
Test component internal test pressure requirements. nominal size ≤ DN300, should be 4 times rated working pressure; DN300 < nominal size ≤
DN600, 2 times rated working pressure; the test piece should be free of leakage and damage.
9.4 Bearing torque of flanges and mechanical tees
Flange and mechanical tee, tested according to the provisions of 10.10.5, bearing torque refers to the calculation method of Appendix D recommended data, may not
Leakage and breakage occurred.
9.5 Low temperature resistance of flanges and mechanical tees
The test assembly shall be tested in accordance with 10.10.6 and the components shall be free from pressure loss and seal damage. The maximum size of the test component is not
Should exceed DN300.
9.6 High temperature aging resistance of flanges and mechanical tees
The test components shall be tested in accordance with 10.10.7, and the components shall be free of air leakage and adhesion and damage of the seals. Maximum gauge of the test assembly
The grid should not exceed DN300.
9.7 Water impact resistance
The test assembly shall be capable of withstanding 20,000 impacts of water from 0 to the rated working pressure without leakage. Maximum size of test components
Should not exceed DN300.
9.8 Anti-vibration performance
The test assembly shall be subjected to a vibration test in accordance with the provisions of 10.10.9. After the test, the compressive strength test shall be carried out, and there shall be no leakage or damage. Test component
The maximum size should not exceed DN150.
10 test methods
10.1 Material testing
The manufacturer shall use sufficient tests to ensure that ductile iron or other materials meet the material grade requirements specified in 5.1. Ductile iron material test
Test. The test of ductile iron material is carried out according to the test method specified in GB/T 1348. Cast steel material test. test of cast steel material
The test method specified in GB/T 11352 is carried out.
10.2 Detecting the angle between the end face of the groove and the end face
The angle of the axis is detected using a universal angle meter or other equivalent method.
10.3 Final visual inspection
The manufacturer shall use appropriate visual inspection methods to check that the grooved pipe fittings and bolts and nuts shall have no obvious defects to ensure the grooved pipe fittings and bolts.
The nut meets the requirements of 4.3, 7.1, 7.2, and 7.3.
10.4 Coating and coating inspection
The manufacturer shall ensure that the coating and plating of the grooved pipe fittings and bolts and nuts meet the requirements of 7.2 and 7.3, and the coating and plating thickness are electronic or magnetic.
A force gauge is used to inspect and visually inspect the compactness and continuity of the coating. The lead content of the paint layer was measured using an elemental analyzer. The lead content of the zinc layer makes
Detected with a spectrometer.
10.5 Thread inspection
Test according to the method specified in GB/T 3287.
10.6 Inspection of the angle of the thread of the mechanical tee pipe
10.6.1 Test Method I
As shown in Figure 1, screw the thread of the mechanical tee with the threaded probe and place it on the platform. First ensure the perimeter of the two points A and B in the illustration.
No burrs and sand, then use the height gauge to directly measure the heights h1 and h2 of the two points A and B in the figure.
According to the distance L and the height h1 and h2 of the two points A and B, and can be converted according to the calculation formula given in Appendix E, the standard is calculated.
The value, the measured difference between h1 and h2 is less than or equal to the standard value, which is qualified.
Figure 1 Detection method I
10.6.2 Test Method II
As shown in Figure 2, screw the thread of the mechanical tee with the thread probe, and measure the lower plane of the probe and the three-way thread of the machine to be tested with a vernier caliper.
The distance of the end, the maximum distance and the minimum distance are h1 and h2 respectively, according to the distances L, h1 and h2 of the two points A and B, and can be given in combination with Appendix E.
The calculation formula is converted to obtain the standard value, and the difference between the measured h1 and h2 is less than or equal to the standard value, which is qualified.
Figure 2 Detection method II
10.6.3 Test Method III
Other equivalent detection methods.
Note. When there is a dispute over the measurement results, the test method I shall prevail.
10.7 Analysis of Polycyclic Aromatic Hydrocarbons
The manufacturer shall ensure that the rust-proof material of the pipe thread meets the requirements of 8.2 and shall be detected by gas chromatography or other equivalent methods.
10.8 Bolt and nut performance test
10.8.1 The test of the mechanical properties of bolts and nuts shall be carried out in accordance with the provisions of GB/T 3098.1 and GB/T 3098.2.
10.8.2 The test of the hardness of bolts and nuts shall be carried out in accordance with the provisions of GB/T 231.1 and GB/T 231.2.
10.9 Rubber seal material test
10.9.1 The physical and mechanical properties of rubber seals shall be tested in accordance with GB/T 528, GB/T 531.1, GB/T 531.2 and GB/T 7759.1.
The provisions of GB/T 7759.2 are carried out.
10.9.2 The hot air aging test of rubber shall be carried out in accordance with the provisions of GB/T 3512.
10.9.3 The liquid immersion test of rubber shall be carried out in accordance with the provisions of GB/T 1690.
10.10 Performance test
10.10.1 Sealing test
All pressure-bearing fittings (except mechanical tees and flanges) can be tested in one of the following ways, visually without leakage.
a) All pressure-bearing fittings should show no signs of leakage. The test console shall be equipped with a validated test pressure gauge and with the test tube
Collusion is connected to get the real effect of the test.
The inside of the pipe is filled with air pressure. Except for the port for inputting air, the other ports are closed, and the air to be filled is full.
After the requirements of the foot, the pipe fittings were completely immersed in the water tank, and no leakage was observed visually. The air pressure and pressure holding time were according to Table 6.
Table 6 Air pressure and pressure holding schedule
No. Nominal size Pressure holding time Remarks
1 ≤ DN50 ≥ 0.5MPa ≥ 5s air pressure
2 >DN50~DN350 ≥0.5MPa ≥10s air pressure
3 >DN350 1.5 times rated working pressure 5min water pressure
b) Other equivalent test methods.
10.10.2 Gas Seal Performance Test
The test assembly shall be fitted with a pressure gauge with a precision of not less than 1.5 to show the actual pressure value. The test should be at a temperature of 20 ° C ± 5 ° C
Conducted in the environment.
The test components shall be fully submerged in water before the test, and the internal pressure shall be increased to 0.1 MPa for a period of time to remove surface bubbles.
Gradually increase the pressure to 0.5 MPa for 5 min, and the test results should meet the requirements of 9.1.
10.10.3 Sealing performance test
As shown in Figure 3, the test assembly should be filled with water and air removed, and the pressure in the line is increased at a rate not exceeding 2 MPa/min until
The pressure value specified in 9.2 is maintained for 5 minutes, and the test results shall comply with the provisions of 9.2.
Description.
1---pipe segment;
2---trenched pipe fittings;
3---exhaust port;
4---pressure gauge;
5---stop valve;
6---Water filling port.
Figure 3 strength seal test device diagram
10.10.4 Compressive strength test
As shown in...
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