JB/T 7238-1994 Technical Specifications for Oil-free Reciprocating Piston Compressors Filled with Edible Carbon Dioxide
Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T7238-94
Technical Conditions for Oil-free Reciprocating Piston Filled with Edible Gas
Carbon Trioxide Compressors
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1995
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Oil-free Reciprocating Piston Filled with Edible Gas
Carbon Dioxide Compressors
1 Subject Content and Scope of Application
JB/T 7238- 94
This standard specifies the technical requirements, test methods, acceptance rules and marking, packaging and storage requirements for oil-free reciprocating piston filled with edible gas carbon dioxide compressors.
This standard applies to oil-free reciprocating piston filled with edible gas carbon dioxide compressors (hereinafter referred to as press machines) with a rated exhaust pressure not exceeding 10MPa.
2 Reference standards
GB1174
GB1176
GB1917
GB3853
GB4980
GB7022
GB7777
GB9438
GB/T13279
GB/T13306
GB/T13384
GB/T15487
JB/T6431
JB/T6908
ZBJ72016
3 Technical requirements
Steel pressure vessels
Casting bearing alloys
Casting copper alloy technology Conditions
Food additivesLiquid carbon dioxide
Performance test methods for general positive displacement air compressorsDetermination of the noise sound power level of positive displacement compressors-Engineering methodDetermination of the noise sound power level of positive displacement compressors-Simplified methodMeasurement and evaluation of mechanical vibration of reciprocating piston compressorsTechnical conditions for aluminum alloy castings
Technical conditions for general fixed reciprocating piston air compressorsSignboard
General technical conditions for packaging of electromechanical products
Flow measurement method for positive displacement compressors
Technical conditions for gray iron castings for positive displacement compressorsTechnical conditions for forgings for positive displacement compressors
Technical conditions for ductile iron cast iron for positive displacement compressors3.1 The compressors shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved through the prescribed procedures. 3.2 The specified working conditions of the compressor are:
Suction pressure
Suction temperature
Suction relative humidity
Cooling water inlet temperature
Exhaust pressure
0.103MPa (absolute pressure);
32℃;
Rated exhaust pressure, MPa:
Rated speed, r/min,
3.3 The specific power, noise sound power level, cooling water consumption, and clarity of the compressor with a rated exhaust pressure of 9.8MPa under the specified working conditions shall comply with the provisions of Appendix A (Supplement). JB/T 7238 94
3.4 The volume flow of the compressor shall be measured at the exhaust end and converted to the first-stage suction state. The volume flow of the compressor under the specified working conditions shall not be less than 95% of the nominal volume flow.
3.5 The operation of the compressor shall be stable. The vibration intensity index of the machine body shall comply with the provisions of GB7777. 3.6 The carbon dioxide gas before entering the compressor shall be clean gas after the water washing filter, and the gas compressed by the compressor shall comply with the technical requirements of GB1917.
3.7 The lubricating oil used in the compressor shall be clean, and the oil filter installed in the lubricating oil pressure staggered loop system shall be able to remove mechanical debris larger than 40μm. The oil pump pressure shall not be less than 0.1MPa, and can be adjusted according to the use requirements. The pressure that the lubrication system can withstand shall not be less than 0.4MPa. 3.8 When the suction overflow does not exceed 35C, the cooling water inlet temperature does not exceed 32C, and the exhaust pressure is the rated pressure. The exhaust temperature at the exhaust pipe after each stage of compression shall not exceed 160C. When the carbon dioxide gas pressure exceeds 7.15MPa, the gas temperature after cooling by the cooler shall not be lower than its critical value.
3.9 When the ambient temperature does not exceed 40℃, the temperature of the lubricating oil in the crankcase should not exceed 70℃. 3.10 A safety valve should be installed after each compressor stage, and the operation should be sensitive, safe and reliable. The safe discharge volume and other requirements should comply with the provisions of Appendix B of GB150.
3.11 The quality of the compressor cooling water should comply with the provisions of Table 1. Table 1
Item Name
Acidity
Suspended matter content
Total hardness
Scale coefficient
m·mol/L
More than 2.14 (12 German degrees)
0. 00026~0., 00043
3.12 The pressure vessel of the compressor should comply with the provisions of the "Regulations on Safety Technical Supervision of Pressure Vessels" and GB150. 3.13 The gas, water and oil connections of the compressor should be sealed and leak-free. 3.14 The pressure-bearing parts of the compressor, such as the cylinder, piston, and air pipeline, shall be subjected to a water pressure test at a pressure not less than 1.5 times the maximum working pressure and maintained for 30 minutes. There shall be no leakage. For the water cavity that needs to be subjected to a water pressure test, a water pressure test shall also be carried out at a pressure of 0.6MPa and maintained for 30 minutes. There shall be no leakage.
Material requirements for compressors
3.15.1 The gray cast iron and ductile iron castings of the compressor shall comply with the provisions of JB/T6431 and ZBJ72016. 3.15.2 Aluminum alloy castings shall comply with the provisions of GB9438. 3.15.3
Copper alloy castings shall comply with the provisions of GB1176. Cast bearing alloys shall comply with the provisions of GB1174. 3.15.4
3.15.5 The forged steel parts of the compressor shall comply with the provisions of JB/T6908. 3.15.6 In the compressor, all parts that are in direct contact with wet carbon dioxide gas should be made of corrosion-resistant materials. For individual parts that must be made of copper, their surfaces should be treated for corrosion resistance.
3.15.7 For parts filled with polytetrafluoroethylene such as pistons and ring packings, corrosion-resistant and gas-free fillers should be used. Fillers such as graphite copper powder should not be used.
Safety protection covers should be installed for exposed moving parts of the compressor. 3.16
The outer surface of the compressor should be cleaned, and the painted or painted surface should be flat, smooth and of uniform color. The operating parts should be treated for decoration. The replacement time of the main wearing parts of the compressor should not be less than that specified in Table 2. 3.18
Piston ring, guide ring
JB/T7238-94
Main wearing parts
Working pressure
According to user needs, the compressor should be equipped with the following automatic control and interlocking devices: a.
Alarm when exhaust temperature at each level exceeds the specified value: alarm or stop when lubricating oil supply pressure is lower than the specified value; alarm when the final exhaust pressure exceeds the specified value; alarm or stop when the cooling water pressure is lower than the specified value. Replacement period
The supply scope of the compressor shall be in accordance with the provisions of the supply contract. If there is no clear provision in the contract, the supply scope is as follows: main engine and matching motor:
Compressor matching auxiliary machine (cooling unloader, buffer and water separator, etc.) and intermediate gas pipeline: transmission device:
machine side instrument and electrical control device;
full set of special tools:
random spare parts:
random technical documents.
Each compressor shall be accompanied by at least the following documents: Product quality certificate:
Operation and maintenance instructions:
Random drawings:
Technical delivery conditions:
Quality certificate of transport container, completion drawing: Packing list,
3.22 Under the conditions specified in the operation and maintenance instructions, the manufacturer shall, within 18 months from the date of shipment, use the compressor for one year (excluding wearing parts). During the warranty period, if the product cannot work normally due to quality problems, the manufacturer shall be responsible for timely repair or replacement.
4 Test method
When the compressor is tested with air as the medium, the requirements shall be carried out in accordance with the provisions of GB3853. 4.2 The cycle test with carbon dioxide as the medium shall be carried out in accordance with the provisions of Appendix B (supplement). 4.3 The noise measurement of the compressor shall be carried out in accordance with the provisions of GB4980 or GB7022. The mechanical vibration measurement method of the compressor shall be in accordance with the provisions of GB7777. 4.4
4.5 The cleanliness inspection method of the compressor shall comply with Article 4.4 of GB/T13279. 5 Inspection rules
5.1. Trial-produced compressors or compressors with major modifications must be type-tested at the manufacturer. Plastic testing generally uses carbon dioxide as the medium. According to the requirements of Appendix B, the full-load continuous operation time should be no less than 500 hours. If there is indeed difficulty in the gas source, it is allowed to be carried out in two stages: first, at the manufacturer, use air as the medium, and operate continuously at full load for 250 hours under the exhaust pressure specified in the test specification according to Article 4.1: Then, at the manufacturer or user, use carbon dioxide as the medium. According to the working conditions specified in this standard and the test method specified in Appendix B, operate continuously at full load for another 250 hours. The two-stage test is to measure the volume flow, shaft power, speed, noise, vibration, etc. of the compressor according to the provisions of Chapter 4. Before and after the full process test, the size of the wearing parts and the wear of the friction surface of the parts should be disassembled and inspected, and the economy and reliability of the product should be evaluated. It can only be put into production after passing the appraisal. 5.2 Each compressor shall be inspected before delivery. The inspection shall be conducted with air as the medium. The continuous operation time shall be no less than 4 hours at the exhaust pressure specified in the test run specification. The volume flow, suction pressure, exhaust pressure at each level, suction and exhaust temperature at each level, shaft power and speed and other parameters shall be measured. The compressor shall be shipped after passing the inspection.
5.3 The compressors produced in batches shall be inspected by sampling. The sampling plan shall be as specified in Table 3. The sampling inspection shall be conducted at the manufacturer. In addition to the cleanliness test, the sampling inspection shall also be conducted with air as the medium. The continuous operation time shall be no less than 24 hours at the exhaust pressure specified in the test run specification. The performance parameters such as volume flow, shaft power and speed shall be measured. The working conditions of all mechanisms of the unit shall be inspected to determine whether the wear of the wearing parts is normal. Table 3
Sample size n
Note: One batch is based on one year's output.
Sub-sampling plan
Number of qualified judgments Ac
Number of unqualified judgments ratio
The sampling results shall comply with the provisions of this standard and relevant technical documents. If unqualified, the manufacturer shall check each product after sampling and correct the unqualified products to comply with the provisions of this standard and relevant technical documents. 6 Marking, packaging, transportation and storage
Each compressor shall be fixed with a label in a conspicuous and flat position. The size and technical requirements of the label shall comply with the provisions of GB/T13306.6.1
The following information should be marked on the label at least: 3.
Product model and name;
Nominal volume flow, m\/min
Rated exhaust pressure.MPa:
Shaft power, kW;
Speed, r/min:
Net weight, kg:
Dimensions (length × width × height), mm: Factory number:
Year and month of production:
Name of manufacturer and location of manufacturer (export products should be marked with "People's Republic of China\"). 6.2 The packaging of the compressor shall comply with the provisions of GB/T13384. 6.3 The main compressor and auxiliary equipment shall be treated with rust and mildew prevention and stored in a ventilated and dry warehouse. Open-air storage is not allowed. It should be ensured that there is no rust or damage within one year after delivery under normal storage conditions. JB/T 723894
Appendix A
9.8MPa compressor performance parameters
(Supplement)
This appendix applies to compressors with nominal volume flow of 1.40, 3.33, 6.66m*/min. The specified working conditions of the compressor shall comply with the provisions of Article 3.2 of this standard, and its rated exhaust pressure is 9.8MPa. A1
Specific power, noise sound power level, cooling Water consumption and cleanliness should not exceed the requirements of Table A1, A2
Nominal volume flow
Specific powerbzxz.net
kW/(m*.min-1)
Noise sound power level
Cold water consumption
Cleanliness
JB/T7238-94
Appendix B
Closed-circuit test measurement regulations
(Supplement)
B1 This appendix applies Closed loop test of compressor with carbon dioxide as medium. See Figure B1 for the test device.
Volume flow measurement is carried out in accordance with GB/T15487. B3
In addition to the provisions of B3, the measurement instruments, measurement methods and calculation of test results are in accordance with the provisions of GB3853, Pl-2
Weekly pressure leveling, etc.
Additional instructions:
294MP:
Screw installation
Intake warm shock
Low pressure balancer
P1-pressure indicator
Carbon dioxide gas supplementer
Closed loop test with carbon dioxide as medium Figure BI
This standard is proposed by the National Compressor Standardization Technical Committee. This standard is under the jurisdiction of the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard is drafted by Hangzhou Oxygen Generator Factory. The main drafters of this standard are Hua Yufei and Yu Yongle. 6
TI--Degradation Indicatormin-1)
Noise sound power level
Cooling water consumption
Cleanliness
JB/T7238-94
Appendix B
Closed-circuit test measurement regulations
(Supplement)
B1 This appendix applies to the closed-circuit test of the compressor with carbon dioxide as the medium. See Figure B1 for the test device.
Volume flow measurement is carried out in accordance with GB/T15487. B3
Except for the measurement instruments, measurement methods and calculation of test results in accordance with B3, the rest shall be in accordance with GB3853, Pl-2
Weekly pressure leveling, etc.
Additional instructions:
294MP:
Screw installation
Intake heater
Low pressure balancer
P1-Pressure indicator
Carbon dioxide gas replenisher
Closed-loop test diagram with carbon dioxide as medium Figure BI
This standard was proposed by the National Compressor Standardization Technical Committee. This standard is under the jurisdiction of the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Hangzhou Oxygen Generator Factory. The main drafters of this standard are Hua Yufei and Yu Yongle. 6
TI--Degradation Indicatormin-1)
Noise sound power level
Cooling water consumption
Cleanliness
JB/T7238-94
Appendix B
Closed-circuit test measurement regulations
(Supplement)
B1 This appendix applies to the closed-circuit test of the compressor with carbon dioxide as the medium. See Figure B1 for the test device.
Volume flow measurement is carried out in accordance with GB/T15487. B3
Except for the measurement instruments, measurement methods and calculation of test results in accordance with B3, the rest shall be in accordance with GB3853, Pl-2
Weekly pressure leveling, etc.
Additional instructions:
294MP:
Screw installation
Intake heater
Low pressure balancer
P1-Pressure indicator
Carbon dioxide gas replenisher
Closed-loop test diagram with carbon dioxide as medium Figure BI
This standard was proposed by the National Compressor Standardization Technical Committee. This standard is under the jurisdiction of the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Hangzhou Oxygen Generator Factory. The main drafters of this standard are Hua Yufei and Yu Yongle. 6
TI--Degradation Indicator
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