This standard replaces JB 458-86 and JB 4345-86. This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of air separators for ammonia refrigeration equipment. This standard applies to air separators for ammonia refrigeration equipment. JB/T 7658.13-1995 Air separators for ammonia refrigeration equipment JB/T7658.13-1995 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Air separator for ammonia refrigeration equipment
Subject content and scope of application
JB/T 7658-13--95
JB 458—86
Replacement:
JB 4345----86
This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of air separators for ammonia refrigeration equipment (hereinafter referred to as separators). This standard applies to air separators for ammonia refrigeration equipment. 2 Reference standards
GB 699
High-quality carbon structural steel
Technical conditions
Carbon structural steel
GB 700
GB1300
GB 1591
Welding steel wire
Low alloy structural steel
GB/T 1804
GB5117
GB5118
GB 6654
GB 8162
GB 8163
Unmarked tolerances for linear dimensions
General tolerances
Carbon steel welding rods
Low alloy steel welding rods
Seamless steel pipes for carbon steel and low alloy steel thick plate structures for pressure vessels
Seamless steel pipes for conveying fluids
GB/T13306 label
ZB J73 027
3 Terminology
3.1 Air separator
General provisions for determination of cleanliness of refrigeration equipment
Equipment used to separate and discharge non-condensable gases (such as air, etc.) that cannot be liquefied in the condenser to ensure that the refrigeration system can maintain normal condensing pressure.
4 Product classification
The structural types of separators are vertical coil type and horizontal sleeve type. 4.2 Model
4.2.1 Model Indication Method
The model of the separator consists of capital Chinese phonetic letters and Arabic numerals (hereinafter referred to as numbers). The model indication method is as follows:
Approved by the Ministry of Machinery Industry of the People's Republic of China on June 16, 1995 1432
Implementation from July 1, 1996
4.2.2 Model Example
JB/T7658.13-95
Retrofit number: Indicated by numbers, omitted for the first design product-Product type: W indicates horizontal type, not vertical type Nominal diameter of ammonia liquid pipe: Indicated by numbers, mm Code of separator
KF20-1: Indicates a vertical separator with a nominal diameter of 20mm for ammonia liquid pipe, the first retrofit. KF32W: Indicates a horizontal separator with a nominal diameter of 32mm for ammonia liquid pipe. 4.3 Basic parameters
The nominal diameter of the ammonia liquid pipe of the separator shall comply with the provisions of Table 1. Table 1
4.4 Design conditions
Design pressure: horizontal
Inside the coil: 1.4MPa;
Outside the coil: 2MPa.
Design temperature: horizontal: 50℃.
Inside the coil: 38℃;
Outside the coil: 50℃
5 Technical requirements
General requirements
The separator shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. It can also be manufactured according to the agreement between the user and the manufacturer.
5.2 Materials
5.2.1 The materials of the main pressure-bearing components of the separator shall have material certificates. 5.2.2 The main materials used in the separator shall comply with the provisions of Table 2. Table 2
Material name
Standard number
GB8162，
GB8163
GB 699,GB 700
GB 1591,GB 6654
5.2.3 The body of the separator shall be made of seamless steel pipe. 5.2.4 The head of the separator shall be formed by rolling of a whole steel plate and shall not be spliced. 5.3 Unspecified tolerances
GB 5117，
GB5118
GB1300
The unspecified tolerances of the linear dimensions of the cutting surface of the separator shall be in accordance with the tolerance grade m (medium grade) specified in GB/T1804, and the unspecified tolerances of the linear dimensions of the non-cutting surface shall be in accordance with the tolerance grade c (rough grade) specified in GB/T1804. 5.4 Pressure resistance and airtightness requirementsbzxz.net
5.4.1 The separator shall be subjected to pressure resistance test. The hydraulic pressure resistance test pressure shall be 1.25 times the design pressure, and the gas pressure resistance test pressure shall be 1.15 times the design pressure. The pressure holding time shall be no less than 10 minutes, and there shall be no leakage. 1433
JB/T 7658.13—95
5.4.2 The airtightness test shall be carried out only after the separator passes the hydraulic pressure test. The test pressure shall be equal to the design pressure, and the pressure holding time shall be no less than 10 minutes, and there shall be no leakage. The airtightness test may not be carried out for the separator that has been subjected to the gas pressure test and has passed the inspection. 5.5 Cleanliness
The interior of the separator shall be clean, and the impurity content in the part in contact with the refrigerant shall not exceed 800mg/m3. 5.6 Appearance quality
The separator should be beautiful and elegant, and the weld surface should be free of cracks, pores, arc pits and slag inclusions. The outer surface should be painted, and the paint should be smooth and uniform in color, and there should be no defects that affect the appearance. 5.7 Completeness
The separator supplied as a complete set should also include:
Ammonia liquid inlet and outlet joints;
Nitrogen outlet joint:;
Mixed gas inlet joint:
Vent air joint:
When the structure requires, a pressure gauge joint, temperature measuring tube and assembly flange can be provided separately. 5.8 Accessories
5.8.1 The accessories of the separator are:
Nitrogen throttle valve or automatic control system composed of solenoid valve, thermal expansion valve, temperature controller, etc.; ammonia stop valve;
C. When the structure requires, a pressure gauge can be provided separately. 5.8.2 The accessories of the separator should comply with the provisions of the relevant standards. 5.9 Warranty period
If the user complies with the provisions of the product manual, within 18 months from the date of shipment from the manufacturer, if the separator is damaged or fails to work properly due to poor manufacturing, the manufacturer shall replace or repair it free of charge. 6 Test method
6.1 Pressure test
6.1.1 Hydraulic pressure test
6.1.1.1 After the separator is manufactured, a hydraulic pressure test shall be carried out. The test medium shall be clean water or other liquids that will not cause danger. The temperature of the liquid during the test shall be much lower than its boiling point or flash point. 6.1.1.2 The test pressure shall be in accordance with the provisions of 5.4.1. 6.1.1.3 Separator hydraulic pressure test method: a. Before the test, the fastening bolts of each connection part of the separator shall be fully assembled and properly tightened. The dial diameter of the test pressure gauge shall be above 100mm. The pressure test shall use two pressure gauges with the same range, which have been calibrated and are within the validity period. The range of the pressure gauge should be about 2 times the test pressure, and should not be lower than 1.5 times and higher than 3 times the test pressure. b. During the test, an exhaust port should be set at the top of the separator, and the air in the separator should be exhausted when filling the liquid. The observation surface of the separator should remain dry during the test
c. Fill the separator with the test medium, exhaust the air, and then slowly pressurize to the test pressure, and maintain the pressure for 10 minutes, and then reduce it to the design pressure. Check under the design pressure, and the separator is qualified if there is no leakage or abnormal deformation in any part. d. The pressure should remain unchanged during the inspection, and continuous pressurization should not be used to maintain the test pressure unchanged, and the bolts should not be tightened under pressure.
After the hydraulic pressure test is completed, the liquid should be exhausted and dried. e.
6.1.2 Gas pressure test
6.1.2.1 The gas used for the gas pressure test should be dry, clean air, nitrogen or inert gas. 1434
JB/T7658.13—95
6.1.2.2 The gas pressure withstand test shall have safety measures, which shall be supervised and inspected by the safety department of the test unit. 6.1.2.3 The test pressure shall be in accordance with the provisions of 5.4.1. 6.1.2.4 Separator gas pressure withstand test method: The preparation work before the test is the same as that in 6.1.1.3a. a.
During the test, the pressure shall be slowly increased to the test pressure, and the pressure shall be maintained for 10 minutes, and then reduced to the design pressure. At the design pressure, all parts of the filter shall be checked for leakage and abnormal deformation by soap solution or other leak detection liquid, and then the filter shall be qualified. If there is leakage, the pressure shall be relieved and repaired, and then the test shall be repeated according to the above provisions.
Bolts.
The pressure should remain constant during the inspection. Continuous pressurization should not be used to maintain the test pressure. Tightening under pressure should not be done. 6.2 Airtightness test
6.2.1 The airtightness test should be carried out after the hydraulic pressure test is passed. If the separator has been subjected to the air pressure test, the airtightness test can be exempted. 6.2.2 The test pressure is equal to the design pressure.
6.2.3 The gas used for the airtightness test shall comply with the provisions of 6.1.2.1. 6.2.4 Method for airtightness test of separator:
a. The preparation work before the test is the same as that in 6.1.1.3a; b. During the test, the pressure should be slowly increased to the test pressure, and after maintaining the pressure for 10 minutes, it should be placed in water at not less than 5°C (or coated with foaming liquid on the outside), and it is qualified if no bubbles are generated;
If there is leakage, the hydraulic pressure resistance test and airtightness test should be carried out again after the pressure is relieved and repaired. c.
6.3 Cleanliness determination
The determination of the cleanliness of the separator can refer to the provisions of ZBJ73027. 7 Inspection rules
7.1-General requirements
The separator should be inspected by the technical inspection department of the manufacturer in accordance with this standard and technical documents, and can only be shipped after passing the inspection. 7.2 Inspection Items
After each separator is manufactured, it shall be subject to factory inspection according to the following inspection items: Check the material report of the main pressure-bearing components; a.
Check the processing quality of the separator;
Check the appearance quality;
Pressure resistance and air tightness test;
Check the contents of the nameplate;
Check the completeness of the product according to the factory documents. 8 Marking, packaging and transportation
8.1 Marking
8.1.1 Label
A label should be fixed on the separator in a conspicuous and flat position. The label should comply with the provisions of GB/T13306 and should indicate the following:
Manufacturing unit and trademark;
Product model;
Product name;
Design pressure;
Design temperature;
Refrigerant;
Net weight;
Manufacturing number;
Manufacturing date.
Factory documents
The separator should be accompanied by a product certificate when it leaves the factory. 8.2
Packaging and transportation
JB/T7658.13—95
When separators and other refrigeration equipment are supplied as a complete set, they can be packed and transported together with other equipment. Before packing, the taper joints should be coated with anti-rust grease and sealed with screw plugs. The flanges should be tightened with bolts, and the flange sealing surfaces should be coated with anti-rust grease and sealed with blind plates. If supplied separately, they should be properly wrapped.
Additional instructions:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Wuhan New World Refrigeration Industry Co., Ltd. and Dalian Refrigeration Co., Ltd. The main drafters of this standard are: Hu Zengwu, Sun Zhengguo, Ha Hongbei, and Li Muzhen. This standard was first issued in January 1964 and revised for the first time in December 1986. 1436
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