This standard replaces JB 462-86 and JB 4344-86. This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of intercoolers for ammonia refrigeration equipment. This standard applies to intercoolers for ammonia refrigeration equipment. JB/T 7658.11-1995 Intercoolers for ammonia refrigeration equipment JB/T7658.11-1995 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Intercooler for ammonia refrigeration equipment
Subject content and scope of application
JB/T 7658. 11--95
JB 462--86
Replaces JB 4344-86
This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of intercoolers for ammonia refrigeration equipment (hereinafter referred to as coolers). This standard applies to intercoolers for ammonia refrigeration equipment. 2 Reference standards
GB 1226
GB12241
—General pressure gauge
Safety valve
GB/T 13306
JB/T 6917
JB/T6918
ZB J73 029
ZB J73 042
3 Terminology
3.1 Intercooler
General requirements
Pressure vessels for refrigeration equipment
Metal and glass sintered liquid level gauges and sight glasses for refrigeration Cleanliness determination method of tubular heat exchangers for ammonia refrigeration equipment Pressure and pressure differential controllers for refrigeration
The heat exchanger between the suction gas of the high-pressure stage compressor and the exhaust gas of the low-pressure stage compressor in a two-stage compressor is used to cool the refrigerant before it is sucked into the high-pressure stage compressor.
4 Product classification
4.1 Type
The structural type of the cooler is vertical shell coil type. 4.2 Model
4.2.1 Model representation method
The model of the cooler consists of uppercase Chinese phonetic letters and Arabic numerals (hereinafter referred to as numbers). The representation method of its model is stipulated as follows:
Retrofit number: represented by numbers, omitted for the first design product Nominal cooling area: based on the surface area of ​​the cooling pipe, represented by numbers, m2 code for coolers
4.2.2 Model example
ZQ7.5-1: represents a nominal cooling area of ​​7.5m2, the first retrofit cooler. Approved by the Ministry of Machinery Industry of the People's Republic of China on June 16, 1995 1424
Implementation from July to January, 1996
4.3 Basic parameters
JB/T 7658. 11-95
The nominal cooling area of ​​the cooler shall comply with the provisions of Table 1. Table 1
4.4 Design conditions
4.4.1 Design pressure
Inside the coil: 2 MPa;
Outside the coil: 1.4 MPa.
4.4.2 Design temperature
Inside the coil: 50C;
Outside the coil: 38C.
5 Technical requirements
General requirements
The cooler shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures, or it may 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 cooler should have material certificates. 5.2.2 The materials used for the cooler should comply with the provisions of JB/T6917. 5.3 Technical requirements for steel pipes
5.3.1 The inner and outer surfaces of the cooler steel pipes should not have defects such as rust, cracks, pitting, etc., and the inner and outer surfaces should be clean and dry. 5.3.2 The bends of the cooler elbows should not have defects such as wrinkles and indentations. 5.4 Liquid baffle
The liquid baffle of the cooler should be flat, without rust on the surface, and the burrs should be removed after drilling the liquid baffle. 5.5 Liquid level control device
5.5.1 When installing the cooler, the liquid level control device should be installed according to the drawings or instructions to ensure its installation accuracy. 5.5.2 When the liquid level control device of the cooler is a float valve, the float valve should be flexible and free of obstruction. 5.6 Cold and hot processing
The cold and hot processing of the cooler shall comply with the provisions of JB/T6917. 5.7 Welding and non-destructive testing
The welding and non-destructive testing of the cooler shall comply with the provisions of JB/T6917. 5.8 Test plates and specimens
The test plates and specimens of the cooler shall comply with the provisions of JB/T6917. 5.9 Parts and components
The parts and components of the cooler such as the cylinder, head, flange, support, support plate, pipe, etc. shall comply with the provisions of JB/T6917. 5.10 Safety accessories
In addition to complying with the provisions of JB/T6917, the safety accessories of the cooler shall also comply with the following provisions: the overpressure relief device shall comply with the provisions of GB12241 and relevant standards; a.
The high-pressure cut-off device shall comply with the provisions of ZBJ73042; 1425
JB/T 7658.11—95
The liquid level gauge and sight glass shall comply with the provisions of JB/T6918; .
d. The pressure gauge shall comply with the provisions of GB1226. 5.11 Pressure resistance and airtightness requirements
5.11.1 The cooler and its cooling coil shall be subjected to pressure test and airtightness test after manufacture, and the requirements shall comply with the provisions of JB/T6917. 5.11.2 When the cooler uses a float valve, the float used should be subjected to a water pressure resistance test of 1.25 times the design pressure or a gas pressure resistance test of 1.15 times the design pressure, and the pressure should be maintained for 5 minutes. It should not be deformed or leak. 5.12 Cleanliness
The interior of the cooler should be clean, and the impurity content in the part in contact with the refrigerant should not exceed 800mg/m3. 5.13 Appearance quality
The cooler 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 evenly smooth and consistent in color, and there should be no defects that affect the appearance. 5.14 Completeness
The cooler supplied as a complete set should include:
Ammonia gas inlet and outlet joints;
Ammonia liquid inlet and outlet joints;
Assembly flange;
Balance pipe joint;
Oil drain joint;
Safety valve joint. wwW.bzxz.Net
5.15 Accessories
The accessories of the cooler are:
Safety valve;
Liquid level indicator;
Pressure gauge valve and pressure gauge;
Ammonia valve;
Liquid level controller or float valve;
Oil drain valve;
Anchor bolts.
Other accessories of the cooler shall comply with the provisions of the relevant standards. Warranty period
If the user complies with the provisions of the product manual, the manufacturer shall replace or repair the cooler free of charge within 18 months from the date of shipment from the manufacturer if the cooler is damaged or fails to work properly due to poor manufacturing. 6 Test methods
6.1 Nondestructive testing
The method of nondestructive testing of coolers shall comply with the provisions of JB/T6917. 6.2 Pressure test and airtightness test
The pressure test and airtightness test methods of coolers shall comply with the provisions of JB/T6917. 6.3 Cleanliness determination
The cleanliness determination method of the cooler shall comply with the provisions of ZBJ73029. 7 Inspection rules
General requirements
JB/T 7658. 11 - 95
The cooler shall 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 cooler is manufactured, it shall be inspected for delivery according to the following inspection items: a.
Inspect the material report of the main pressure-bearing components: Check the processing quality of the cooler;
Inspect the appearance quality of the cooler;
Inspect the non-destructive testing report;
Inspect the pressure resistance and airtightness test report;
Check the contents of the label;
Check the integrity of the product according to the factory documents. 8 Marking, packaging and transportation
8.1 Marking
8.1.1 Label
The cooler should have a label fixed on a clear and flat position. The label should comply with the provisions of GB/T13306. The content marked on the label can refer to the provisions of JB/T6917.
8.7.2 Factory documents
The factory documents of the cooler can refer to the provisions of JB/T6917. 8.2 Packaging and transportation
8.2.1 All exposed processing surfaces and connecting pipes of the cooler should be coated with rust-proof agent and properly sealed. The assembly flange should be tightened with bolts, and the flange sealing surface should be coated with anti-rust grease and sealed with a blind plate. 8.2.2 The paint, packaging and transportation of the cooler can refer to the provisions of JB/T6917. Additional notes:
This standard is 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 Hongbo and Li Muzhen. This standard was first issued in January 1964 and revised for the first time in December 1986. 1427
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