This standard replaces JB 467-86 and JB 4338-86. This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of horizontal evaporators for ammonia refrigeration equipment. This standard is applicable to evaporators with an evaporation temperature of -24~5℃ (gauge pressure of 0.062~0.426MPa). JB/T 7658.4-1995 Horizontal evaporator for ammonia refrigeration equipment JB/T7658.4-1995 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Horizontal Evaporator for Ammonia Refrigeration Device
Subject Content and Scope of Application
JB/T7658.4—95
JB467-86
Replacement of JB4338-86
This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of horizontal evaporators for ammonia refrigeration devices (hereinafter referred to as evaporators). This standard applies to evaporators with evaporation temperatures of -24 to +5C (gauge pressure of 0.062 to 0.426MPa). 2 Reference standards
GB1226 General pressure gauge
GB12241 General requirements for safety valves
GB/T13306 Label
JB/T6421
1 Grey cast iron parts for refrigeration compressors
Technical conditions
JB/T 6917
Pressure vessels for refrigeration equipment
ZBJ73029
Method for determining the cleanliness of tubular heat exchangers for ammonia refrigeration equipment3 Terminology
3.1 Horizontal evaporator
Shell and tube evaporator in which the heat exchange tubes and shell are placed horizontally, the heat exchange tube bundle is immersed in the evaporating refrigerant, and the cooled water, brine or other liquid flows in the tubes.
4 Product classification
4.1 Type
The evaporator is a horizontal shell and tube type.
4.2 Model
4.2.1 Model Indication Method
The model of the evaporator consists of capital Chinese phonetic letters and Arabic numerals (hereinafter referred to as numbers). The model indication method is as follows: WZ
-Revision number: Indicated by numbers, the first design product omitted area: Based on the surface area of ​​the evaporating tube, indicated by numbers, m2-Code of the evaporator
4.2.2 Model Example
WZ90-1: Indicates that the nominal evaporation area is 90m, the first modification of the evaporator. 4.3 Basic Parameters
Approved by the Ministry of Machinery Industry of the People's Republic of China on June 16, 1995
Implemented on July 1, 1996
JB/T7658.4-95
The nominal evaporation area of ​​the evaporator shall comply with the provisions of Table 1. 4.3.1
4.3.2 Thermal parameters
4.3.2.1 Heat transfer coefficient of the outer surface of the evaporator a.
When the coolant is salt water: K ≥ 535W/(m·C); When the coolant is water: K ≥ 580W/(m·C). 40
4.3.2.2 The operating conditions for determining the heat transfer coefficient of the outer surface of the evaporator shall comply with the provisions of Table 2. Table 2
Evaporation temperature t.
Heat transfer temperature difference Am
Water pressure loss Ap
Fouling coefficient r
4.4 Design conditions
Water side (steel pipe)
Design pressure: ammonia side 1.4MPa;
Water side: 0.4MPa.
b. Design temperature: 38℃.
5 Technical requirements
General requirements
0. 000 00
The evaporator 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 evaporator shall have material certificates. 5.2.2 The materials used for the evaporator shall comply with the provisions of JB/T6917. 5.3 Gray iron castings
The gray iron castings of the evaporator can refer to the relevant provisions of JB/T6421. 5.4 Cold and hot processing
The cold and hot processing of the evaporator shall comply with the provisions of JB/T6917. 5.5 Welding and non-destructive testing
The welding and non-destructive testing of the evaporator shall comply with the provisions of JB/T6917. 5.6 Test plate and test specimen
The test plate and test specimen of the evaporator shall comply with the provisions of JB/T6917. 1390
5.7 Parts and components
JB/T 7658.4-95
The parts and components of the evaporator such as the cylinder, flange, support, tube sheet, support plate, tube and tube bundle shall comply with the provisions of JB/T6917. 5.8 Automatic control element
The float valve and its automatic control element shall ensure that the seal is leak-free, and the operation is flexible and without obstruction. 5.9 Safety accessories
In addition to complying with the provisions of JB/T6917, the safety accessories of the evaporator shall also comply with the following provisions: a: The overpressure relief device shall comply with the provisions of GB12241 and relevant standards. b. The pressure gauge shall comply with the provisions of GB1226. 5.10 Pressure resistance and airtightness requirements
The evaporator shall be subjected to pressure resistance test and airtightness test, and the requirements shall be in accordance with the provisions of JB/T6917. 5.11 Cleanliness
The inside of the evaporator shall be clean, and the impurity content in the part in contact with the refrigerant shall not exceed 800mg/m2. 5.12 Appearance quality
The evaporator shall be beautiful and elegant, and the weld surface shall be free of cracks, pores, arc pits and slag inclusions. The outer surface shall be painted, and the paint shall be smooth and uniform in color, and there shall be no defects that affect the appearance. 5.13 Completeness
The evaporator supplied as a complete set shall also include:
Ammonia inlet and outlet joints;
Safety valve joints;
Water inlet and outlet joints;
Pressure gauge joints;
Balance pipe joints;
Drain joints;
Oil drain joints;
Assembly flanges and supports;
Air and water drain joints on the side of the water cover.
5.14 Accessories
The accessories of the evaporator are
Ammonia valve;
Regulating valve, safety valve;
Ammonia liquid filter;
Float valve or other automatic liquid level control device; Pressure gauge;
Anchor bolts;
Water and air drain valves.
5.14.2 The accessories of the evaporator shall comply with the provisions of the relevant standards. 5.15 Warranty period
If the user complies with the provisions of the product manual, the manufacturer shall replace or repair the evaporator free of charge within 18 months from the date of shipment from the manufacturer if the evaporator is damaged or fails to work properly due to poor manufacturing. 6 Test method
6.1 Performance test
The performance test method of the evaporator can adopt the industrial operation test. 1391
6.2 Nondestructive testing
JB/T 7658.4-95
The method of nondestructive testing of the evaporator shall comply with the provisions of JB/T6917. 6.3 Pressure test and airtightness test
The pressure and airtightness test methods of the evaporator shall comply with the provisions of JB/T6917. 6.4 Cleanliness determination
The cleanliness determination of the evaporator can refer to the provisions of ZBJ73029. Inspection rules
General requirements
The evaporator shall be inspected by the manufacturer's technical inspection department in accordance with this standard and technical documents, and may be shipped only after passing the inspection. 7.2 Inspection items
7.2.1 Inspection classification
The inspection of the evaporator is divided into factory inspection and type inspection. 7.2.2 Inspection items
The inspection items of the evaporator shall be in accordance with the provisions of Table 3. Table 3
Inspection items
Performance test
Cleanliness
Material report of main pressure-bearing parts
Processing quality
Casting quality
Appearance quality
Non-destructive testing report
Pressure resistance and airtightness test
Check the contents of the label
Check the completeness of the product according to the factory documents
7.3 Factory inspection
Each evaporator should be inspected after it is manufactured. 7.4 Type inspection
Factory inspection
Type inspectionwww.bzxz.net
7.4.1 For new products of at least 100 specifications of evaporators or old products that have undergone major reforms, type inspection should be carried out. 7.4.2 The performance test method of the evaporator can adopt the industrial operation test. 8 Marking, packaging and transportation
8.1 Marking
8.1.1 Label
The evaporator should be fixed with a label 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.
8.1.2 Factory documents
The factory documents of the evaporator can refer to the provisions of JB/T6917. 8.2 Packaging and transportation
JB/T7658.4—95
1 All the pipes of the evaporator should be coated with anti-rust 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 culture plate.
8.2.2 The paint, packaging and transportation of evaporators can refer to the provisions of JB/T6917. Additional remarks:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Dalian Refrigeration Co., Ltd. and Wuhan New World Refrigeration Industry Co., Ltd. The main drafters of this standard are: Ha Hongbo, Li Muzhen, Sun Zhengguo, Hu Zengwu. This standard was first issued in January 1964 and revised for the first time in December 1986. 1393
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