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GB 26787-2011: [GB/T 26787-2011] Safety specifications of line regulator used in welding, cutting and allied processes
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[GB/T 26787-2011] Safety specifications of line regulator used in welding, cutting and allied processes
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Basic data
Standard ID: GB 26787-2011 (GB26787-2011)
Description (Translated English): [GB/T 26787-2011] Safety specifications of line regulator used in welding, cutting and allied processes
Sector / Industry: National Standard
Classification of Chinese Standard: N11
Classification of International Standard: 17.100
Word Count Estimation: 10,170
Date of Issue: 2011-07-29
Date of Implementation: 2011-12-01
Quoted Standard: GB/T 25112-2010; GB/T 25473-2010
Regulation (derived from): Announcement of Newly Approved National Standards No. 12 of 2011
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This Chinese standard specifies the welding, cutting and allied processes pipe reducer (hereinafter referred to as pressure reducer) guarantee safety materials, technical requirements, test methods and inspection rules and other aspects of the mandatory requirements. This standard applies to the cylinders of compressed gas or methyl acetylene allene mixture (MPS), acetylene convergence to the high-pressure gas mains, adjust to the desired output pressure of the single-stage and two-stage pipeline pressure reducer.
GB 26787-2011: [GB/T 26787-2011] Safety specifications of line regulator used in welding, cutting and allied processes
---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.
Safety specifications of line regulator used in welding, cutting and allied processes
ICS 17.100
N11
National Standards of People's Republic of China
Welding, cutting and allied processes
Pipeline pressure reducer safety regulations
Safetyspecificationsoflineregulatorusedinwelding, cuttingand
aliedprocesses
Issued on. 2011-07-29
2011-12-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
All the technical contents of this standard is mandatory.
This standard is based on the national standard GB/T 25473-2010 "welding, cutting and allied processes pipe reducer" in terms of safety to
It is prepared.
The Standard Appendix A, Appendix B is an informative annex.
The standard proposed by China Machinery Industry Federation.
This standard by the national industrial process measurement and control Standardization Technical Committee (SAC/TC124) centralized.
This standard is drafted by. Xi'an Institute of Industrial Automation Instrumentation.
This standard was drafted. Shanghai Regulator Co., Ltd., Leier Da Instrument Co., Ltd., Ningbo margin of Gas Control Equipment Manufacturing Co.,
Company Welding Technology Co., Ltd. Ningbo Long.
The main drafters of this standard. Jin Jianhua, Huang Shicheng, Huang Jingfeng, Zhang Da, yellow diligence.
This standard is the first release.
Welding, cutting and allied processes
Pipeline pressure reducer safety regulations
1 Scope
This standard specifies the welding, cutting and allied processes pipe reducer (hereinafter referred to as regulator) guarantees safety materials, technology
Mandatory Requirements, test methods and inspection rules and other aspects.
This standard applies to the compressed gas cylinders or methyl acetylene - a mixture of propadiene (MPS), the bus to the high pressure acetylene gas manifold
Body adjusted to the desired output pressure single-stage and two-stage pipeline pressure reducer.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 25112-2010 welding, cutting and allied processes gauges (ISO 5171.1995, MOD)
GB/T 25473-2010 welding, cutting and allied processes pipe reducer (ISO 7271.1999, MOD)
3 Symbol
Table 1 shows the symbols used.
The symbols used in Table 1
Symbol Description Unit of Measure
p1 rated (maximum) inlet pressure MPa
p2 rated (maximum) outlet pressure MPa
Inlet pressure p3 type test. p3 = 2p2 0.1MPa MPa
pRV safety valve opening pressure 1.5p2≤pRV≤2p2 MPa
QRV traffic safety valve QRV≥0.5Q1 m3/h
4 Materials
4.1 Metal Materials
4.1.1 acetylene or metallic material having similar chemical properties of the gas contact
With acetylene or a metallic material having similar chemical properties of the gas contact, the copper content of the material may not exceed 70%.
Retardant material metal pieces (including sintered metal parts) application does not contain copper processing.
When using silver brazing copper alloy, silver content not exceeding 46% of the copper content shall not exceed 37%.
4.1.2 contact with oxygen in the metal material
Various elements can not be in contact with oxygen-containing oil. Springs and other moving parts should be in contact with oxygen oxidation-resistant material and may not be
To be coated.
4.2 Non-metallic materials
4.2.1 solvent resistance
Non-metallic materials in contact with acetylene (e.g., as a sealing member and lubricant material) should be resistant to acetone and dimethylformamide
(DMF) solvent properties. Solvent resistance requirements in Appendix A.
4.2.2 n-pentane-resistant performance
Propane, butane and methyl acetylene - propadiene mixture of non-metallic material of the contact (e.g., as a sealing member and lubricant material) should be a
Adequate resistance properties of n-pentane. Pentane-resistant performance requirements in Appendix A.
4.2.3 oxygen-resistant performance
All components in contact with oxygen should not contain may react violently with oxygen substances such as hydrocarbon solvents and oils.
Can be used in maximum working pressure and temperature, the lubricant can be used in oxygen.
5 Technical requirements
5.1 Mechanical strength
5.1.1 Structural Strength
Design and manufacture of pressure reducer should be applied to ensure that the pressure specified in Table 2 in the high and low pressure chamber after not lead to permanent deformation.
Table 2 Test pressure
Regulator type high-pressure chamber pressure chamber
Oxygen and other compressed gases, p2 < 1MPa
Acetylene
Methyl Acetylene - a mixture of propadiene (MPS)
Oxygen and other compressed gases, p2 > 1MPa
1.2 × 1.5 × p1
3MPa
6MPa
5.1.2 Security
Design and manufacture of pressure reducer shall ensure that the intermediate chamber pressure chamber or two-stage pressure reducer with full gas bottle in direct communication, the pressure reducer valve Paul
Held in the open position and the closed outlet connection (such as with additional shut-off valve or blind plug closing), high-pressure gas can be safely cut-off or discharge.
5.2 safety valve
5.2.1 General
In addition to all of those pressure regulator for acetylene, it should provide a safety valve for discharging pressure over the outlet pressure.
When the outlet pressure is less than or equal to 1.5 times the rated outlet pressure, safety valve should be sealed; when the amount is greater than the outlet pressure of 1.5 to 2 times
When the set outlet pressure, exhaust valve should open. Traffic safety valve should QRV≥0.5Q1 acetylene gas pressure reducer in any case are pRV
Shall be equal to 0.3MPa.
After the safety valve opening, the outlet pressure drops greater than p2 should be closed. For users, the safety valve is not adjustable.
5.2.2 valve installation position
General safety valve and pressure reducer directly connected to a low pressure chamber.
5.3 pressure regulating means
The design of this device should ensure that the regulator can be used safely, it is recommended in Appendix B of the structure.
When using the regulator set pressure relief valve should always be kept sealed.
5.4 Oxygen Regulator
Oxygen Regulator design, fabrication and assembly should be done inside the blasting does not occur. All parts and accessories should be thoroughly cleaned before assembly
Degreasing. After the assembly should be able to withstand 20 times the inlet pressure of oxygen continuous impact shock, fire and may not appear charred internal damage.
5.5 gauge
5.5.1 Flag
Measuring oxygen gauge dial shall be marked in red the word "oil" or, as no oil flags shown.
1 oil ban flag
5.5.2 Energy release
When the spring tube rupture, leakage of gas pressure gauge should enable positive direction away from the discharge pressure gauge, pressure gauge glass should be no damage.
6 type tests
6.1 Test conditions
6.1.1 Total properties testing equipment
All piping and flow test equipment connected to the control valve diameter should be greater than the test pressure reducer caliber.
6.1.2 Type of gas
The test shall be at an ambient temperature of 23 ℃ ± 2 ℃, relative humidity of 50% ± 5%, ambient pressure of 0.086MPa ~ 0.106MPa
Under conditions, with oil-free air or nitrogen.
Explosion test oxygen regulator should be used oxygen.
In all cases, the test should apply the maximum moisture content of not more than 0.005% of the gas, the corresponding dew point -48 ℃.
6.2 Mechanical strength test
Warning. The test should take protective measures.
6.2.1 The structural strength test
During the test, replace the plug with a hole safety valve and pressure gauge, pressure reducer diaphragm instead of sheet metal. Table 2 applying regulations on the high-pressure chamber and a low pressure chamber
Given water pressure test 5min. After the test check the dimensions and shape without permanent deformation (for example, the use of contrast measurement).
6.2.2 Safety Test
The test pressure reducer valve should remain open persistent or dismounted. Pressure gauge and replace the safety valve when the test hole plug, close the outlet. through
Manually open the valve too quickly, applying a pneumatic pressure p1 to pressure reducer imports.
Regulator should be no cracks. Such as cracks, debris shall not be discharged. The mounting pressure safety device allows gas through
This apparatus.
6.3 safety valve
During the test, open or remove the pressure reducer valve, closing the outlet reducer. ≤1.5p2 pressure exerted by imports, at this pressure,
Safety valve should be sealed. Then the pressure relief valve to open, the pressure at ≤2p2, recording the pressure relief valve opens. Then
Pressure increased pRV = 2p2, and the measured flow QRV at this pressure safety valve.
6.4 Explosion test (Oxygen Regulator)
Each of the three prototype testing, so that the oxygen pressure reducer valve inlet subjected to a pressure shock wave generated by the shock of industrial oxygen (pure oxygen
At least 99.5% of; hydrocarbons ≤0.0001%). Test systems should be installed preheated oxygen equipment, oxygen bottles and a quick opening valve. Figure 2 shows the test rig
An example.
1 --- oxygen source;
2 --- inlet valve;
3 --- then oxygen cylinder pressure sensor;
4 --- Ti thermocouple;
5 --- oxygen cylinder with a preheating device (such as a water bath, electric heating apparatus);
6 --- fast opening valve;
7 --- outlet valve;
8 --- takeover;
Pressure sensor 9 --- then the outlet valve;
10 --- measuring point;
11- reducer experimental prototype.
Figure 2 test bench blasting
Before the test, the test pressure measured at point 10, increased from atmospheric pressure to the test time required shall be 20 0-5ms (see Figure 2).
Test pressure may be measured at point 9 from the sample at a secret cover 30mm ~ 40mm (see Figure 2). Every time you want to record at least two pressure shock
wave. Quick opening between the valve and the regulator took the test length of 750mm, an inner diameter of 14mm. Before testing, the prototype should be placed in the room
temperature. The test gas is preheated to 60 ℃ ± 3 ℃ during the test, the test pressure for this temperature should be 1.2 × p1.
20 by the pressure of each test interval of 30s shock (see Figure 3).
Each pressure shock wave continued 10s. After each exert a pressure shock wave through the inlet end of the valve should be restored to the atmospheric pressure reducer.
Between each shock pressure, atmospheric for at least 3s.
In one set of experiments, the inlet pressure drop shall not exceed 3% p1 values.
Figure 3 test interval
Shall be tested under the following conditions.
a) pressure reducer valve in the fully open position, the outlet closed;
b) pressure reducer valve in the fully closed position.
Regulator in the test may not fire. After the test is completed, three prototype should disassemble and inspect all internal parts and surfaces. Internal
There are not damaged and burned reception.
6.5 Test pressure regulating means
If necessary, check the pressure adjustment screw is not removable. For acetylene regulator, closing the gas outlet, it does not set pressure
It may be greater than 0.15MPa.
7 Inspection rules
Regulator prototype was tested three (oxygen pressure of 5), if a station does not meet the requirements of 5.1 to 5.5, then this batch of products is not
Qualified, only each test items for each test prototypes are qualified before judging this batch of qualified products.
Appendix A
(Informative)
Solvent resistance of non-metallic materials
A.1 Acetone resistant non-metallic materials and dimethylformamide (DMF) solvent properties
Test material under the following conditions.
a) at 23 ℃ ± 2 ℃ temperature, respectively (DMF) solvent saturated vapor placed in acetone and dimethylformamide 168h ± 2h;
b) at 40 ℃ ± 2 ℃ temperature, placed in the air 70h ± 2h;
c) at a temperature of 23 ℃ ± 2 ℃, 50% relative humidity environment placed 24h ± 2h in air.
Which may not exceed 15% of the change in mass (anti-swelling), changes in hardness shall not exceed ± 15IRHD.
Pentane-resistant properties of non-metallic materials A.2
Test material under the following conditions.
a) at 23 ℃ ± 2 ℃ temperature, n-pentane in a liquid placed 168h ± 2h;
b) at 40 ℃ ± 2 ℃ temperature, placed in the air 70h ± 2h;
c) at a temperature of 23 ℃ ± 2 ℃, 50% relative humidity environment placed 24h ± 2h in air.
Which may not exceed 15% of the change in mass (anti-swelling), changes in hardness shall not exceed ± 15IRHD.
Appendix B
(Informative)
Pressure regulating means
B.1 design of this device should make sure that when the spring is fully compacted (compacted to its length), the regulator can not maintain its open state.
B.2 If the pressure adjustment screw is sized to prevent the spring is fully compacted, the adjusting screw should not be removable.
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