Some standard content:
Mechanical Industry Standard of the People's Republic of China
Air cooler for ammonia refrigeration equipment
Subject content and scope of application
JB/T 7658.6--95
JB4353--86
Replaces JB4354-86
JB4342-86
This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of air coolers for ammonia refrigeration equipment (hereinafter referred to as coolers). This standard applies to air coolers for ammonia refrigeration equipment. 2 Reference standards
GB 708
GB1300
Technical conditions for high-quality carbon structural steel
Carbon structural steel
Dimensions, shapes, weights and tolerances of cold-rolled steel sheets and stripsCold-rolled steel strips for carbon structural steel
Welding wire
GB/T 1804
GB3194
GB 5117
GB 8162
GB 8163
General tolerances
Unspecified tolerances for linear dimensions
Dimensions and tolerances of aluminum and aluminum alloy platesCarbon steel welding rods
Seamless steel pipes for structures
Seamless steel pipes for conveying fluids
GB/T13306 Labels
ZB J73 029
3 Terminology
Method for determining the cleanliness of tubular heat exchangers for ammonia refrigeration equipment3.1 Air cooler (air cooler)
An evaporator in which the refrigerant evaporates in the tubes and cools the forced air.4 Product classification
4.1 Type
4.1.1 Coolers are divided into two types according to their installation type: floor-standing type and ceiling-mounted type. 4.1.2 Coolers are divided into three types according to their use: for cooling cold storage rooms, for freezing cold storage rooms, and for freezing rooms. 4.2 Model
4.2.1 Model Indication Method
The model of the cooler is composed of uppercase 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 1995-06-16 1400
Implementation on 1996-07-01
4.2.2 Model Example
JB/T7658.6—95| |tt||Retrofit number: Indicated by numbers, omitted for the product designed for the first time. Nominal cooling area: Based on the total area of the outer surface of the cooler finned tube, expressed by numbers, m2
Application code: L indicates use in the refrigerated room for cooling objects, D indicates use in the refrigerated room for freezing objects; J indicates use in the freezing room
Cooler type: L indicates floor-standing type, D indicates ceiling-mounted type: LJ200: indicates a floor-standing cooler for the refrigerated room for cooling objects with a nominal cooling area of 200m2. DJ50-1: indicates a ceiling-mounted cooler for the freezing room with a nominal cooling area of 50m2, the first retrofit. 4.3 Basic parameters
4.3.1 The nominal cooling area and basic parameters of the floor-standing cooler shall comply with the provisions of Table 1. Table 1
Cooler
Application category
For cold storage room for cooling objects
For cold storage room for frozen objects
For freezing room
For cold storage room for cooling objects
For cold storage room for frozen objects
For freezing room
For cold storage room for cooling objects
For cold storage room for frozen objects
For freezing room
For cold storage room for cooling objects||tt ||For frozen goods cold storage room
For frozen goods cold storage room
For frozen goods cold storage room
For frozen goods cold storage room
For frozen goods cold storage room
For frozen goods cold storage room
For frozen goods cold storage room
For frozen goods cold storage room
For frozen goods cold storage room
Cooling area
11 000
22 000
27 000
Total wind pressure
Equipped motor power
Cooler
Application category
For cold storage room for cooling goods
For cold storage room for frozen goods
For freezing room
For cold storage room for cooling goods
For cold storage room for frozen goods
For freezing room
For cold storage room for cooling goods
For cold storage room for frozen goods For use in cold rooms
For use in freezing rooms
For use in refrigerated rooms for cooled goods
For use in refrigerated rooms for frozen goods
For use in refrigerated rooms for frozen goods
For use in refrigerated rooms for frozen goods
For use in refrigerated rooms for frozen goods
For use in refrigerated rooms for frozen goods
Cooling area
JB/T 7658. 6-95
Continued Table 1
40 000
45 000
Total wind pressure
4.3.2 The nominal cooling area and basic parameters of ceiling-mounted coolers shall comply with the requirements of Table 2. Table 2
Cooler
Application category
For cold storage room for cooling objects
For cold storage room for frozen objects
For freezing room
For cold storage room for cooling objects
For cold storage room for frozen objects
For freezing room
For cold storage room for cooling objects
For cold storage room for frozen objects
For freezing room
Cooling area
Total wind pressure
Equipped motor power
Equipped motor power
Cooler
Application category|| tt||For use in cold storage room for cooling goods
For use in cold storage room for frozen goods
For use in freezing room
For use in cold storage room for cooling goods
For use in cold storage room for freezing goods
For use in cold storage room for cooling goods
For use in cold storage room for freezing goods
For use in cold storage room for cooling goods
For use in cold storage room for freezing goods
4.3.3 Thermal parameters
Cooling area
JB/T7658.6---95
Continued Table 2
4.3.3.1 The heat transfer coefficient of the cooler K=12W/(m2,℃). 4.3.3.2 The working conditions for measuring the heat transfer coefficient of the cooler shall comply with the provisions of Table 3. Table 3
Evaporation temperature to
For cold storage room for coolant
For cold storage room for frozen material
For freezing room
Temperature difference A between warehouse air temperature and ammonia evaporation temperature
Air flow rate
4.4 Design conditions
Design pressure: 1.4MPa;
Design temperature: 38℃.
5 Technical requirements
5.1 General requirements
Full wind pressure
Equipped motor power
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. 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 cooler shall have material certificates. 5.2.2 The main material standards used in the cooler shall comply with the provisions of Table 4. 1403Www.bzxZ.net
Material name
Standard number
GB8162,
GB8163
JB/T7658.6--95
GB 699,GB 700,
GB 708,GB716
GB3194
GB 5117
GB1300
5.3 Unnoted tolerances
The unnoted tolerances of machined surfaces shall comply with the tolerance grade m (medium grade) in GB/T1804. The unnoted tolerances of non-machined surfaces shall comply with the tolerance grade c (rough grade). 5.4 Cooling coil
5.4.1 Before construction, the cooling pipe should be straightened, the inside of the pipe should be clean and dry, and the surface oxide scale and dirt should be removed. 5.4.2 The fin surface should not have defects such as corrosion, cracks, obvious scratches and abrasions, and the fin edge should not have burrs or flash. 5.4.3 When the cooling pipe is a series of fins, the fin punching is an "L"-shaped extended flange. The flange should not be broken. 5.4.4 The fins and steel pipes should fit tightly without looseness. The cumulative loose length of each tube of the wrapped cooling pipe should not exceed 200mm. The expansion amount of the series of fins cooling pipe should not be less than 0.4mm, and the interference between the tube and the fin should not be less than 0.15mm. When the tube is expanded mechanically, there should be no scratches from the expander or other tools on the inner wall of the tube after expansion. 5.4.5. Defects such as bending and collision of fins should be corrected before leaving the factory, but the area of fins to be straightened should not exceed 5% of the total surface area. 5.4.6 The roundness tolerance of the bent pipe should not be greater than 15% of the outer diameter of the pipe. 5.4.7 The wall thickness reduction at the bend of the pipe should not be greater than 17% of the original wall thickness, and there should be no defects such as wrinkles and indentations at the bend. 5.4.8 The cooling coil should be treated with surface anti-corrosion, and the surface should be smooth after treatment, without defects such as spots and tumors. 5.5 Frame, water tray
5.5.1 The welds of the frame and water tray should be flat and even, without desoldering, and the connecting welds should be polished. 5.5.2 The wall panel should be flat, without warping and skewing. 5.5.3 The flatness of the frame and water tray should not exceed ±1mm within 1m. 5.5.4 After the water tray is manufactured, a leak test should be carried out, and there should be no leakage. 5.6 Flange
The flange surface should be perpendicular to the main axis of the pipe. When installing the pipe flange, the flange surface should be horizontal or vertical, and the deviation should not exceed 1% of the flange outer diameter and should not exceed 3mm.
5.7 Fan
In addition to complying with the relevant standard push regulations, the fan used in the cooler should also be flexible and free of jamming. The fan blades should have sufficient strength and there should be no defects on the blades that affect the strength. 5.8 Insulation resistance
The motor, terminal box terminals and other electrical equipment of the cooler fan should be subjected to insulation resistance test. The insulation resistance between the insulated circuit and the ground should be not less than 2MQ (measured by a 500V megohmmeter). 5.9 Pressure resistance and airtightness requirements
All parts of the cooler in contact with the refrigerant should be subjected to pressure test and airtightness test, and airtightness test should be carried out after assembly. 5.10 Cleanliness
The inside of the cooler should be clean, and the impurity content in the part in contact with the refrigerant should not exceed 800mg/m. 5.11 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. 5.12 Completeness
The cooler supplied as a set should also include:
a. Ammonia inlet and outlet joints;
b. Frost water inlet joint;
c. Assembly flange.
5.13 Accessories
5.13.1 The accessories of the cooler are:
a. Ammonia valve;
b. Fan together with the motor driving it.
JB/T7658.6—95
5.13.2 The accessories of the cooler should comply with the provisions of the relevant standards. 5.14 Warranty period
Under the condition that the user complies with all provisions of the product manual, 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, the manufacturer shall replace or repair it free of charge. 6 Test method
6.1 Performance test
The performance test method of the cooler can adopt industrial operation test. 6.2 Pressure resistance and airtightness test
6.2.1 Air pressure resistance test
6.2.1.1 The gas used for air pressure resistance test should be dry, clean air, nitrogen or inert gas. 6.2.1.2 The air pressure resistance test should have safety measures, which shall be supervised and inspected by the safety department of the test unit. 6.2.1.3 The test pressure is 1.15 times the design pressure. 6.2.1.4 Cooler gas pressure withstand test method: a: Before the test, the fastening bolts of each connection part of the cooler should be fully assembled and properly tightened. The dial diameter of the test pressure gauge should be above 100mm. The pressure withstand test should 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, the pressure should be slowly increased to the test pressure, and the pressure should be maintained for 10 minutes, and then reduced to the design pressure. Under the design pressure, all parts of the cooler are checked with soap solution or other leak detection liquid for leakage and abnormal deformation, etc. It is qualified. If there is leakage, unload the pressure and repair it, and then retest according to the above regulations.
Bolts.
The pressure should remain unchanged during the inspection. Continuous pressurization should not be used to maintain the test pressure unchanged. Tightening under pressure should not be done. 6.2.2 Airtightness test
6.2.2.1 If the components of the cooler in contact with the refrigerant have been subjected to the pressure resistance test, the airtightness test can be exempted. However, the airtightness test should be carried out after assembly.
6.2.2.2 The test pressure is equal to the design pressure. 6.2.2.3 The gas used for the airtightness test should be dry, clean air, nitrogen, and inert gas. 6.2.2.4 Cooler airtightness test method:
a. The preparation work before the test is the same as that specified in 6.2.1.4a. 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 not less than 5℃ (or coated with foaming liquid on the outside). It is qualified if no bubbles are generated.
If there is leakage, the pressure resistance test and airtightness test should be carried out again after the pressure is released and repaired. c.
6.3 Water pan leak test
Fill the cooler water pan with water, and then check that there should be no leakage at the welds of the water pan. 6.4 Insulation resistance test
Under normal temperature or relative humidity less than or equal to 80%, use a 500V megohmmeter to measure the insulation resistance between the insulation line of the fan motor terminal and the ground. The value should be no less than 2MQ1405
6.5 Cleanliness determination
JB/T 7658.6-95
The cleanliness determination of the cooler can refer to the provisions of ZBJ73029. 7 Inspection rules
7. General requirements
The cooler 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
7.2.1 Inspection classification
The inspection of the cooler is divided into factory inspection and type inspection. 7.2.2 Inspection items
The inspection items of the cooler shall be in accordance with the provisions of Table 5. Table 5
Inspection items
Performance test
Cleanliness
Processing quality
Water tank leak test
Insulation resistance test, check appearance quality
Pressure 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 cooler shall be inspected after it is manufactured. 7.4 Type inspection
Factory inspection
Type inspection
7.4.1 Type inspection shall be carried out for new products of at least specifications of coolers or old products that have undergone major reforms. 7.4.2 The performance test method of the cooler can adopt industrial operation test. 8 Marking, packaging and transportation
8.1 Marking
8.1.1 Label
The cooler shall be fixed with a label on a conspicuous and flat position. The label shall comply with the provisions of GB/T13306 and shall indicate the following information:
Manufacturing unit and trademark;
Product model;
Product name;
Design pressure,
Design temperature,
Cooling area;
Refrigerant;
Fan air volume and air pressure;
Total power of motor;
j. Net weight;
Manufacturing number;
Manufacturing date.
Shipment documents
The cooler shall be accompanied by the following shipment documents when it leaves the factory. 8.1.2.1
Product certificate, the contents of which are:
Manufacturing unit and trademark;
Product model;
Product name;
Factory number;
Inspection conclusion;
Signature and seal of the inspector and person in charge;
Inspection date.
Product manual, the contents of which are:
Product model and name;
Purpose and applicable scope;
Specifications and technical parameters;
Structure and working principle;
Installation and use instructions;
Maintenance, care and repair;
Appearance drawing.
8.1.2.3Packing list.
8.2 Packaging and transportation
JB/T 7658.6—95
8.2.1 The cooler fan should be marked with an arrow indicating the direction of rotation. 8.2.2 The exposed machined surfaces and pipe connections of the cooler should be coated with anti-rust agent and properly sealed. The assembly flange should be fastened with bolts, and its sealing surface should be coated with anti-rust grease and sealed with a blind plate.
8.2.3 The cooler can be installed naked. During transportation, a bracket should be provided to prevent rolling and movement. Accessories should be packed. During shipment, there should be a shipping mark and a transport packaging mark.
Additional Notes:
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, and Hu Zengwu. This standard was first issued in January 1964 and revised for the first time in December 1986. 1407
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