JB/T 9271-1999 Pressure gauges for welding, cutting and similar processes
Some standard content:
ICS 17.1CC
Machinery Industry Standard of the People's Republic of China
JB/T 9271—1999
neq Is0 5171—1980
Pressure gauges used in welding, cutting and related processes1999-08-06 Issued
National Bureau of Machinery Industry
2000-0101 Implemented
JB.8271--1999
This standard adopts the national standard IS05171-[9B for pressure gauges used in welding, cutting and similar processes). This standard is a revision of ZBN110u[1986 for pressure gauges used in welding, cutting and similar processes. When you order it, the original standard is modified and edited, and the main technical changes are not included.
This standard shall be effective from the date of implementation. Appendix A and Appendix B of this standard are both appendices of the standard. This standard is proposed and approved by Puan Industry Automation Instrumentation Research Institute. The unit that initiated the proposal for this standard is Xi'an Industrial Automation Research Institute. The drafters of the standard are Zhang Zhanxiong, Zhang Ziqiang, and Yue Shuhongfan.
Machinery Industry Standard of the People's Republic of China
Pressure gauges used in welding cuttng and related processes JB/T 9271—t999
negISO 51711980
This standard specifies the classification, technical additions, test methods, inspection specifications and markings of welding, cutting and other process equipment with pressure changes.
This standard is applicable to welding, cutting and other process equipment with pressure gauges below 100 and liquefied gas pressure not exceeding 2DMP2 (introduction to the standard). The new provisions included in the standard become the international detailed provisions and are effective in the international version of the company through reference in the standard. All standards will be available, and all parties involved in this standard should explore the possibility of using the most recent international standard. R/T5464-1955 Instruments General Technical Conditions BT9752·1999 Industrial Automation Instruments Basic Type or Size and Specifications JB.T9253-1999 Industrial Automation Instruments General Specifications JB.T9324-1999 Instruments Grade Virtual Inspection Before Operation 3 Basic Technical Parameters and Materials
The nominal shell of the meter should be divided into three types: 40mm, soram and 0rtl3.1
3.2 The accuracy level of the meter is 2.5.
3.3 The pressure measurement range of the meter should be in accordance with the level 1 room: meter!
For the gas and other
bed gas
0-0.1. 0-0.16
0-0.6,0-1.6
0-2.5. 0-4
The values of the length of the guide are only applicable to the gas pressure of 1.9MPa. The values in brackets are only applicable to the gas pressure of 20APa. 3.4 The size of the instrument probe joint and the rotation of the pointer shall comply with the provisions of Table 1-3 and Table 2: 3.5 Materials 3.5.1 Z fast gauge National Machinery Industry Bureau 1999-0B-06 batch (0-4:-10-40)--2000-01-01 application The nominal point of the shell is JR/T 9271--1999 The total weight of the parts connected shall not exceed 70 (m/): When using wheel welding, the silver content and the silver content of the weld shall not exceed 43% (mm) and 20% (m/m) respectively. The width of the weld bay shall not exceed: 0.3 mm Note: 5% (mm) represents these percentages.
3.5.2 Oxygen meter
The oxygen contact parts and elastic materials have the ability to resist chemical reaction with oxygen and will not burn under working conditions. All parts of the oxygen meter must be degreased before assembly. 4 Technical requirements
4.1 Working conditions
4.1.1 The ambient temperature is -20℃-+40℃.
4.1.2 The maximum working force of the instrument shall not exceed 3/4 of the upper limit of the measurement range. 4.2 Vertical working conditions
Under the following conditions, the basic error, equal point and pointer rotation of the instrument shall comply with the relevant provisions of this standard: a) The instrument is in the vertical position;
b) The load changes:
center) The ambient temperature is 20±5
4.3 Basic error
The basic error of the instrument is expressed by the reference error, which shall not exceed the provisions of Table 3. 2
Note: Red
4.4 Finger rotation performance
JB/T B271—1999
Without stop pin
During the measurement, the instrument pointer should not move or turn. 4.5 Temperature response
When the ambient temperature deviates from 20℃ by ±5%, the indication error (including the equalization point) shall not be greater than the following formula: = = ±(S+KAr)
The allowable indication error of the instrument when the ambient temperature deviates from 20℃ by 5℃ is expressed in the same way as the basic error limit. %
is the allowable error limit specified in 4.3, %: a--
is the ambient temperature specified in 4.1.1, ℃: : -- when it is higher than 25℃, it is 25℃, when it is lower than 15℃, it is 15: K—0.04 %/C:
4.6 Load
shall comply with the provisions of Table 4 and withstand 30.0 overload test. Table 4
Upper limit of the measurement range
4.7 The instrument parts in contact with the gas shall be subjected to a tolerance test of 150% of the upper limit of the measurement range. 4.8
The case of the instrument shall be able to withstand a torsion test with a torque of 10Nm and 25V for a period of not less than 30 seconds. 4.9 The meter should be able to withstand the 1kN force bending test. 4.10 Indicator device 4.10.1 The meter should be scaled according to the direction of the meter. The scale indication should refer to Appendix A (standard resistance recording). 4.t0.2 The distance between the meter pointer and the dial surface should be within the range of 1m-3m. When the pointer rotates, the distance between the pointer and the dial plane should not be greater than 4.10.3 The instrument needle should comply with the provisions of JB/T9252. 4.10.4 The form and ratio of the instrument scale should comply with the provisions of JB/T9253. The long scale line should be in the form of half thick line and half thick money. The width of the thick line part should not exceed D.5mm for the meter with a shell nominal diameter of 40, and should not exceed 0.7mm for the meter with a shell nominal diameter of 50 and 60m.
The height of the middle scale and short scale of the meter should not exceed 1/1 of the width of the long scale line. 4.10.6 The deviation of the actual point load of the meter dial with stop pin from the theoretical point load increase direction should not exceed the absolute value of the basic error limit; the range of the zero point scale and mark of the meter dial without stop pin should not exceed twice the absolute value of the basic error limit. 3
4.11.1 Steam oil
JB/T9271 ..-1989
The instrument used to measure oxygen pressure must be free of grease. 4.11.2 Air intake dead area
The air intake area of all the spring coils of this instrument should not exceed 0.1. 4.11.3 Energy release
When the spring coil is broken, the exhaust hole on the back of the instrument should be able to release the gas away from the instrument in the positive direction, and the instrument glass should not be damaged. 4.12 Anti-transport and storage environment test Under the transport and packaging conditions, it should comply with the provisions of B/T929. Among them: the wet heat test is carried out first, the temperature of the two groups is 55℃, the humidity temperature is -40, and the free fall altitude is 250m
5 test The order of type test and the interval time of each item are shown in Appendix B (Standard Appendix). 5.1 Test medium During factory inspection, the test medium entering the oxygen meter is not allowed to contain oil. 5.2 Basic difference inspection 5.2.1 Inspection conditions Follow the reference test conditions in 4.2. Note: Factory inspection may not be carried out under the conditions of reference test, but the meter shall still comply with the provisions of 47 and 44 under the existing working conditions. 5.2.2 Standard positioner The absolute value of the absolute condition difference of the new standard is not greater than 1/5.2 of the absolute error recorded by the test instrument.3 Inspection points
Inspection points should be selected evenly within the range. Except for the zero point, which must be inspected, there should be no less than 4 inspection points. 5.2.4 Inspection method
The instrument should be inspected by comparing with the standard instrument. ) Increase the load steadily, inspect the inspection points until the upper limit of the measuring range is reached, and keep it for 3 minutes. After that, reduce the load steadily, and bring each inspection point to zero;
6) Read the finger wheel after cutting.
5.3 Zero point error inspection
Only the instrument is placed in the positive position, and the load is applied externally. ) For instruments with zero stop pins, the pointer should be located on the stop pins: ) For instruments without zero stop pins, the pointer seat is located within the zero scale line. 5.4 Stability inspection of rotation
During the inspection of 5.2, observe whether the stability of the instrument pointer rotation meets the requirements of 4.4. 5.5 Simple test
Put the instrument in a constant temperature box, and avoid heating (cooling) to 4,1.1.1. The upper (lower) limit of the overflow cabinet diagram is set. After the temperature stabilizes, make the instrument bear 3/4 of the upper limit of the measurement range, and keep it not less than 3, then remove the load, and then test according to 5.2-5.4 after the test. At this time, the compensation of the language effect is not matched with the table. 5.6 Overload test
Under the test conditions of 5.2.1, the meter shall be subjected to overload test according to the provisions of 4.6. After removing the load, it shall be tested according to 5.2-5.4. 5.7 Indicator test
Test. The result shall comply with the provisions of 4.10. 5.8 Overload test
JB/T9271—1999
Apply a load of more than 15% of the value above the instrument to the gas contact. After stabilization, turn off the load and cut off the pressure. Observe the pressure gauge (accuracy level not less than 4) within 10 minutes. The indication shall not be Drop phenomenon, 5.9 Torsion test
Install the instrument on a torsion test device that cannot fix the instrument (as shown in Figure 4), and then apply a force in the direction of tightening the instrument thread.
) Apply a 10m torque for 30*, remove the torque and test according to 5.2~2.4; 5) Apply a 25N·m force for 30 to remove the torque, pressurize the instrument to the upper limit of the measurement range, wait for the load range to be determined, and read the limit: The pressure instrument for case monitoring (accuracy level not less than 0.4 level) should have no downward quotient phenomenon: Figure 4
5.10 Bending test || tt||The degree meter is installed on the test equipment, and the pressure of the meter is measured on the positive, wound and aromatic parts respectively (as shown in Figure 5). To Latine, only the pressure value is set within the new range, and after the load is determined, the stop valve is closed. The monitoring device is used for the death case (the degree of sensitivity is not less than 0.4 level), and the indication is that there is no decline in the phenomenon.
Except: the test is not a good test. Figure 5
5.11 Safety test
5.1t.1 Oil test
Pour pure warm water into the oil tank, and finally fill it up, then add water to the whole oil tank. The water is in the instrument, and there is no colored oil on the water surface. 5.11.2 Inspection of air supply hole area
Use a measuring tool to inspect the spring temporary reverse air hole area of the gauge, and its value should comply with the provisions of 4.11.2. 5.11.3 Energy release efficiency test
Connect the instrument to the gas source, so that it can store energy E=PV, and exhaust the heat in the gas chamber after heating. When it is not in the gas chamber, the gas from the gas source should be continuously filled in. Among them: P-
-1.5 times the upper limit of the measurement range. If it is calculated but less than 4MIPa, take 4KPB:5
spring charge penetration value,
JR/T S9271—1999
: Please use a forceful air bag to absorb the air in the instrument. If the air in the instrument or head is not less than 5m5.t2, the ambient temperature of the instrument shall be tested according to the regulations of T9329. After each test, check 5.2~5.4. 6 Acceptance rules
6.1 The instrument shall be inspected in the factory one by one according to the requirements of 4.3, 4.4, 4.10.2, 4.10.5 and 4.11.1 and the corresponding test methods. It can only be shipped out with qualified inspection documents.
8.2 Type test
Under the following conditions, the instrument shall be subjected to type test in accordance with all technical requirements and test methods of this standard: a) Trial production of new products:
The instrument produced by the company is usually abandoned;
The change of design, process or material affects the performance of the instrument;
This three-step production period is only a loss, and the re-production is not necessary. 7 Marking, packaging and storage
7.1 Marking
The instrument should be marked with:
a) Manufacturer's name or trademark:
5) Specimen name or code:
c) Unit of measurement:
d) Abstract 2) For oxygen and oxygen measuring instruments, the type shall be marked with a red “No contact with samples” or oil mark (such as Figure 6). The production method or batch number. The requirements of 5),,) must be marked on the label plate. 7.2 Packaging The packaging of the received instrument shall comply with the provisions of CR.T15464, and the type of protective film shall be selected by the manufacturer. 7.3 Storage The received instrument shall be stored in a dry and ventilated room. The indoor air should be free of the instrument. 9271—1999
Appendix A
(Appendix with additional information)
Scale diagram
General installation quantity
Sub-standard installationwww.bzxz.net
Medical space
Anti-repellent treatment, environmental production process
JB/T 9271—t999
Record B
(Additional information)
Type test sequence and interval time between items shall not exceed
The following steps shall be completed within xmin to show the next step3 Energy release test
Connect the instrument to the gas source, so that it can store energy E=PV, and exhaust the heat in the gas chamber after heating. When it is not in the gas chamber, the gas source should be continuously filled in. Among them: P-
-1.5 times the upper limit of the measurement range. If it is less than 4MIPa, take 4KPB:5
elastic value,
JR/T S9271—1999
rotten: Please use a force chess elastic to accept the air intake of the meter in the position, then only the gas in the meter or the head should not be less than 5m5.t2 in the transportation, storage and environmental barrier test according to T9329 regulations, and install 5.2~5.4 after each test. 6 Acceptance rules
6.1 First inspection
The instruments must be inspected one by one in accordance with the requirements of 4.3, 4.4, 4.10.2, 4.10.5 and 4.11.1 and the corresponding test methods. They can only be shipped out after the inspection is qualified and accompanied by a qualified certificate.
8.2 Type test
Under the following conditions, the instrument shall be subjected to type test in accordance with all technical requirements and test methods of this standard: a) Trial production of new products:
The instrument produced by the company is usually abandoned;
The change of design, process or material affects the performance of the instrument;
This three-step production period is only a loss, and the re-production is not necessary. 7 Marking, packaging and storage
7.1 Marking
The instrument should be marked with:
a) Manufacturer's name or trademark:
5) Specimen name or code:
c) Unit of measurement:
d) Abstract 2) For oxygen and oxygen measuring instruments, the type shall be marked with a red “No contact with samples” or oil mark (such as Figure 6). The production method or batch number. The requirements of 5),,) must be marked on the label plate. 7.2 Packaging The packaging of the meter shall comply with the provisions of CR.T15464, and the type of protective film shall be selected by the manufacturer. 7.3 Storage The meter shall be stored in a dry and ventilated room. The air inside should be clean and free from the instrument. Measurement value The total number of grids JB/T 9271—1999
Appendix A
(Appendix with additional information)
Scale diagram
General installation quantity
Sub-standard installation
Medical space
Anti-repellent treatment, environmental production process
JB/T 9271—t999
Record B
(Additional information)
Type test sequence and interval time between items shall not exceed
The following steps shall be completed within xmin to show the next step3 Energy release test
Connect the instrument to the gas source, so that it can store energy E=PV, and exhaust the heat in the gas chamber after heating. When it is not in the gas chamber, the gas source should be continuously filled in. Among them: P-
-1.5 times the upper limit of the measurement range. If it is less than 4MIPa, take 4KPB:5
elastic value,
JR/T S9271—1999
rotten: Please use a force chess elastic to accept the air intake of the meter in the position, then only the gas in the meter or the head should not be less than 5m5.t2 in the transportation, storage and environmental barrier test according to T9329 regulations, and install 5.2~5.4 after each test. 6 Acceptance rules
6.1 First inspection
The instruments must be inspected one by one in accordance with the requirements of 4.3, 4.4, 4.10.2, 4.10.5 and 4.11.1 and the corresponding test methods. They can only be shipped out after the inspection is qualified and accompanied by a qualified certificate.
8.2 Type test
Under the following conditions, the instrument shall be subjected to type test in accordance with all technical requirements and test methods of this standard: a) Trial production of new products:
The instrument produced by the company is usually abandoned;
The change of design, process or material affects the performance of the instrument;
This three-step production period is only a loss, and the re-production is not necessary. 7 Marking, packaging and storage
7.1 Marking
The instrument should be marked with:
a) Manufacturer's name or trademark:
5) Specimen name or code:
c) Unit of measurement:
d) Abstract 2) For oxygen and oxygen measuring instruments, the type shall be marked with a red “No contact with samples” or oil mark (such as Figure 6). The production method or batch number. The requirements of 5),,) must be marked on the label plate. 7.2 Packaging The packaging of the received instrument shall comply with the provisions of CR.T15464, and the type of protective film shall be selected by the manufacturer. 7.3 Storage The received instrument shall be stored in a dry and ventilated room. The indoor air should be free of the instrument. 9271—1999
Appendix A
(Appendix with additional information)
Scale diagram
General installation quantity
Sub-standard installation
Medical space
Anti-repellent treatment, environmental production process
JB/T 9271—t999
Record B
(Additional information)
Type test sequence and interval time between items shall not exceed
The following steps shall be completed within xmin to show the next step
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