This standard specifies the technical requirements, test methods, inspection rules and other requirements for reciprocating piston medium-pressure oxygen compressors. This standard applies to reciprocating piston oxygen compressors (hereinafter referred to as oxygen compressors) with a suction pressure of 0.002-0.020 MPa, a discharge pressure of 3 MPa, and a nominal volume flow of 300-6000 m3/h. JB/T 6893-1993 Technical requirements for reciprocating piston medium-pressure oxygen compressors JB/T6893-1993 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T 6893-1993
Reciprocating Piston Medium-Pressure Oxygen Compressor
Technical Conditions
Published on July 13, 1993
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1994
Mechanical Industry Standard of the People's Republic of China
Reciprocating Piston Medium-Pressure Oxygen Compressor
Technical Conditions
Subject Content and Scope of Application
JB/T 68931993
This standard specifies the technical requirements, test methods, inspection rules and other requirements for reciprocating piston medium-pressure oxygen compressors. This standard applies to reciprocating piston oxygen compressors (hereinafter referred to as oxygen compressors) with a suction pressure of 0.002-0.020MPa, a discharge pressure of 3MPa and a nominal volume flow rate of 300-6000m/h. 2
Cited standards
GB4980
GB7022
GB 7777
GB/T13306
GB/T13384
JB5902
JB/T6892
ZB J76010.1
Specified working conditions
Steel pressure vessels
Determination of the sound power level of positive displacement compressor noise - Engineering methodDetermination of the sound power level of positive displacement compressor noise - Simple methodMeasurement and evaluation of mechanical alarm of reciprocating piston compressor
General technical conditions for packaging of electromechanical products
Technical conditions for oxygen pipelines for air separation equipmentPerformance test methods for reciprocating piston oxygen compressorsTechnical conditions for large and medium-sized air separation equipment
Suction pressure, 0.020MPa:
Suction temperature, 30℃;
Relative humidity of gas, 0;
Cooling water inlet temperature, 30℃:
Cooling water volume, ≤
Exhaust pressure, 3.0MPa.
Technical requirements
General requirements
(the amount of cooling water consumed per cubic meter of gas compressed); the oxygen compressor shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. The oxygen compressor and its ancillary equipment shall be able to operate continuously and safely under the prescribed operating conditions. The operating time shall not be less than two years, and short-term shutdown for replacement of wearing parts is allowed during operation. 4.1.2
The volume flow measured at the exhaust port and converted to the standard intake position state shall not be less than 95% of the nominal volume flow. 4.1.4
When the volume flow required by the user or the process flow does not allow negative deviation, it should be clearly stated in the contract. The nominal (approved by the Ministry of Machinery Industry on July 13, 1993, implemented on July 1, 1994, JB/T 6893-1993
determined) volume flow of the oxygen compressor should be 5% larger than the required volume flow to compensate for normal manufacturing errors and ensure that the lower limit of the volume flow is not lower than the required volume flow value. 4.1.5 The operation of the oxygen compressor should be stable, the vibration intensity of the machine body should comply with the provisions of GB7777, and the full amplitude of the cylinder head along the cylinder axis should not exceed 1×10-times of the distance from the crankshaft axis to the measuring point. 4.1.6 Under the specified working conditions, the volumetric specific energy and noise sound power level of the oxygen compressor should comply with the provisions of Table 1. Table 1
Piston force kN
4.2 Safety and reliability
Volume specific energy
kW·h/m
1The availability A of the oxygen compressor shall not be less than 92%, and its value shall be calculated as follows:4.2.1
Average working time
Average working time+average non-working time4. 2. 2
Noise sound power level dB(A)
≤112
A safety valve shall be installed after each compression stage of the oxygen compressor, and the discharge volume and other requirements of the safety valve shall comply with the provisions of Appendix B (Supplement) of GB150.
The safety valve shall be installed in a position not disturbed by vibration, and the oxygen discharged from the safety valve shall be concentrated and led to a safe area outdoors. All parts in contact with oxygen should be strictly degreased and deoiled, and the grease residue should be less than 125mg/m2. 4.2.4
The design and manufacture of oxygen pipelines of oxygen compressors shall comply with the provisions of JB5902. The oxygen compressor must have measures to prevent lubricating oil and its oil mist from entering the cylinder compression chamber during operation. The design, manufacture and inspection of pressure vessels used in oxygen compressors must comply with the "Regulations on Safety Technical Supervision of Pressure Vessels" of the Ministry of Labor and the provisions of GB150.
The oxygen compressor should have alarm or alarm parking safety protection devices for the following situations: Exhaust temperature at each level is too high:
The exhaust pressure at the final stage is too high;
The lubricating oil supply pressure is too low:
The suction pressure is too low:
The cooling water supply pressure is too low.
The sealer (stuffing box) should not leak oxygen to the machine room, and the leaked gas should be returned to the suction pipe through the collecting pipe or led to a safe area for venting.
The oxygen compressor's primary inlet shall be equipped with an oxygen filter with a filtration particle size of no more than 300. The filter screen shall be made of corrosion-resistant copper alloy, high nickel alloy or stainless steel wire. 4.2.11
The replacement period of the main vulnerable parts of the oxygen compressor shall comply with the provisions of Table 2. 4.3 Design requirements
Main vulnerable parts name
Piston ring
Guide ring
Seal ring (packing)
Valve spring
Buffer sheet
JB/T6893-1993
Replacement period
≥4000
≥3000
4.3.1 The lubrication system of the moving mechanism shall at least include an oil filter, an oil pump, oil supply and return oil pipelines, an oil cooler and necessary instruments. When the rated shaft power of the oxygen compressor is above 550kW, an auxiliary oil pump driven by a separate motor should be provided. 4.3.2 The intermediate body of the oxygen compressor should be of sufficient length so that no part of the piston rod surface enters the oil scraper and the cylinder seal alternately.
4.3.3 The friction surface of the piston rod in contact with the stuffing box seal ring should have a hardness of not less than 50HRC and a surface roughness R of not more than 0.4μ. The piston rod thread should be rolled or ground, and the thread surface roughness R should be not more than 3.2μ. 4.3.4 The design pressure of the cylinder should be at least 15% higher than the rated exhaust pressure of the level or 0.1MPa higher, whichever is greater. 4.3.5 The design of the valve assembly and the cylinder assembly should ensure that the lift limiter or valve connecting bolt will not fall into the cylinder cavity even if it is broken or loosened.
4.3.6 The temperature difference between the inlet and outlet of the gas cooler should be less than or equal to 8℃: the maximum water temperature should not be greater than 45℃: the temperature difference between the outlet gas after cooling and the cooling water inlet should be less than or equal to 10℃. The flow rate of the cooling water used in the cooler should be selected according to the requirements of 1.5~2.5m/s when it flows under pressure. The water quality of the cooling water should comply with the provisions of Table 3 of ZBJ764.3.7
010.1.
4.3.8 The design of the piping and auxiliary equipment of the oxygen compressor unit should control the pressure unevenness of the pulsating air flow to not exceed 4%~5%. 4.4 Manufacturing requirements
4.4.1 The defects with a depth exceeding 2/3 of the machining allowance are not allowed on the important machining surfaces of carbon steel castings: the depth of the defects on the non-machining surface shall not exceed 15% of the wall thickness, and welding method is allowed to be used for repair. If necessary, welding stress should be eliminated after welding. 4.4.2 The neck position of the carbon steel casting crosshead is not allowed to be repaired by welding, and ultrasonic inspection shall be carried out after processing. 4.4.3 The crankshaft, connecting rod and piston rod shall be subjected to ultrasonic inspection after rough processing, and magnetic particle inspection shall be carried out after fine processing. 4.4.4
The non-processed surfaces of the main engine and auxiliary machine of the oxygen compressor shall be painted according to the relevant documents or contract requirements. The paint film is required to be heat-resistant, oil-resistant and corrosion-resistant, and the paint surface is required to be smooth and flat.
After the oxygen compressor is pre-assembled, it is selected and adjusted. All parts and components that are not allowed to be interchangeable shall be marked at the appropriate positions of the connection. 4.4.5
4.5 Supply and complete set scope of oxygen compressor
The scope of supply of oxygen compressor shall be in accordance with the contract.
The complete set of oxygen compressor generally includes the following items: 4.5.2
Oxygen compressor main engine:
Auxiliary equipment:
Electric motor, starting equipment and its auxiliary devices: Instrument and electronic control device matching the oxygen compressor unit; JB/T6893-1993
Gas pipeline and its pipeline flange, valves and accessories belonging to the oxygen compressor unit: Special tools necessary for disassembling and assembling the oxygen compressor; f.
Spare parts of wearing parts that can meet two years of use.
5Test methods and inspection rules
5.1 All parts and components of the oxygen compressor and the entire unit shall be inspected by the manufacturer's product quality management department in accordance with the relevant provisions of this standard and the drawings and technical documents approved through a certain procedure. If the contract stipulates, the user may also participate in the inspection and acceptance of relevant items. 5.2 The oxygen compressor shall be subjected to type test in one of the following situations: a.
Type test during trial production of new products or transfer of old products to factory production: when there are major changes in structure, materials or processes after mass production, which may affect product performance; b.
When there is a significant difference between the results of random inspection test or factory test and type test. c.
5.3 The continuous operation time of the oxygen compressor type test shall not be less than 500h; the items measured in the type test include: volume flow, shaft power, speed, cooling water consumption, suction pressure and suction temperature, exhaust pressure and temperature at all levels, wear status of wearing parts, vibration and noise, etc. The oxygen compressor can be put into mass production only after the type test and identification. 5.4 Oxygen compressors produced in batches shall be subjected to random inspection tests as specified in Table 3, and the number of random inspections shall be evenly distributed throughout the year. The random inspection test time shall not be less than 48 hours, and the performance parameters such as volume flow, shaft power, speed, etc. shall be measured to check the working conditions of all mechanisms of the unit and whether the wear of wearing parts is normal. If one of the items of the oxygen compressor being inspected fails, the above test must be carried out on each unit of this batch of products, and the unqualified products must be repaired.
Annual output
Number of random inspections
The performance test of the oxygen compressor shall be carried out in accordance with JB/T6892. 5.5
>20~50
Formally put into production oxygen compressors shall be tested by the manufacturer one by one, and shall comply with the provisions of Appendix A (Supplement) of JB/T6892. 5. 6
And the following requirements shall be followed:
No-load test for 2h;
Load test under rated working conditions for no less than 3h: b.
Safety valve trip pressure test.
The noise power level of the oxygen compressor shall be measured in accordance with GB4980 or GB7022. 5.7
The determination of the residual grease content of the oil-free parts and components of the oxygen compressor shall be carried out in accordance with the provisions of Appendix C (Supplement) of ZBJ76010.1. 5.8
The load operation test of the oxygen compressor is allowed to be carried out with oil-free dry air or dry nitrogen. Marking, packaging and storage
The oxygen compressor should be nailed with a nameplate in an obvious position. The size and technical requirements of the nameplate should comply with the provisions of GB/T13306. 6.2
The nameplate of the oxygen compressor product should indicate the following:4
Product model and name:
Nominal volume flow, m/h;
Nominal exhaust pressure, MPa;
Shaft power, kW:
Speed, r/min.
Net weight, kg:
Overall dimensions, mm;
Factory number:
Year and month of manufacture:
Name of manufacturer.
JB/T6893-1993
The packaging of the oxygen compressor should comply with the provisions of GB/T13384. 6.3
The oxygen compressor mainframe and its ancillary equipment, supporting electrical appliances, instruments, etc. should be treated with rust and mildew prevention and stored in a warehouse or covered place. All parts and components that come into contact with oxygen shall not be sealed with grease. It should be ensured that there is no rust and mildew damage within six months under normal circumstances after delivery. 6.5
Each oxygen compressor should be accompanied by at least the following documents: a.
Product quality certificate;
Operation and maintenance instructions:
Random drawings:
Pressure vessel certificate, completion drawing
Packing list.
Additional instructions:
This standard is proposed and managed by Hangzhou Oxygen Generator Research Institute of the Ministry of Machinery Industry. This standard is drafted by Hangzhou Oxygen Generator Research Institute. The main drafters of this standard are Peng Zhenkang, Yu Yongle, Zhu Rongxiong, and Zhao Yanhu. 5
People's Republic of China
Mechanical Industry Standard
Reciprocating Piston Medium Pressure Oxygen Compressor
Technical Conditions
JB/T 68931993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880X1230
Print Sheet 1/2
Word Count 10,000
First Printing in October 1993
First Edition in October 1993
Print Quantity 1500
Price 1.50 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661689
Product quality certificate;
Operation and maintenance instructions:
Random drawings:
Pressure vessel certificate, completion drawing
Packing list.
Additional instructions:
This standard is proposed and managed by Hangzhou Oxygen Generator Research Institute of the Ministry of Machinery Industry. This standard is drafted by Hangzhou Oxygen Generator Research Institute. The main drafters of this standard are Peng Zhenkang, Yu Yongle, Zhu Rongxiong and Zhao Yanhu. 5
People's Republic of China
Mechanical Industry Standard
Reciprocating Piston Medium Pressure Oxygen Compressor
Technical Conditions
JB/T 68931993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880X1230
Print Sheet 1/2
Word Count 10,000
First Printing in October 1993
First Edition in October 1993
Print Quantity 1500
Price 1.50 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661689
Product quality certificate;
Operation and maintenance instructions:
Random drawings:
Pressure vessel certificate, completion drawing
Packing list.
Additional instructions:
This standard is proposed and managed by Hangzhou Oxygen Generator Research Institute of the Ministry of Machinery Industry. This standard is drafted by Hangzhou Oxygen Generator Research Institute. The main drafters of this standard are Peng Zhenkang, Yu Yongle, Zhu Rongxiong and Zhao Yanhu. 5
People's Republic of China
Mechanical Industry Standard
Reciprocating Piston Medium Pressure Oxygen Compressor
Technical Conditions
JB/T 68931993
Published and issued by the China Academy of Mechanical SciencebZxz.net
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880X1230
Print Sheet 1/2
Word Count 10,000
First Printing in October 1993
First Edition in October 1993
Print Quantity 1500
Price 1.50 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661689
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