JB/T 7658.5-1995 Evaporative condensers for ammonia refrigeration equipment
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Evaporative condensers for ammonia refrigeration equipment
Subject content and scope of application
JB/T7658.5~-95
Replaces B39-91
JB 3337-91
This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of evaporative condensers for ammonia refrigeration equipment (hereinafter referred to as condensers). This standard applies to evaporative condensers for ammonia refrigeration equipment. 2 Reference standards
Technical conditions for high-quality carbon structural steel
GB1300
GB1591
Carbon structural steel
Steel wire for welding hot-rolled thin steel plates and steel strips of carbon structural steel and low-alloy structural steel
Low-alloy structural steel
GB/T3091
GB/T3092
GB5117||tt ||GB5118
GB8162
GB8163
Galvanized welded steel pipe for low-pressure fluid transportation
Welded steel pipe for low-pressure fluid transportation
Carbon steel welding rod
Low alloy steel welding rod
Seamless steel pipe for structure
Seamless steel pipe for conveying fluid
GB/T13306
ZBJ73 029
3 Terminology
Method for determination of cleanliness of tubular heat exchanger for ammonia refrigeration device 3.1 Evaporative condenser
Condenser that uses forced air circulation and evaporation of water to carry away the condensation heat of refrigerant 4 Product classification
4.1 Type
Condensers are divided into two types according to their air supply type: air supply type and air suction type. 4.2 Model
4.2.1 Model Indication Method
The model of the condenser 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 1995-06-16 1394
Implemented on 1996-07-01
4.2.2 Model Example
JB/T7658.5-95
Retrofit number: Indicated by numbers, omitted for the first design product Nominal condensing area: Based on the surface area of the condenser tube, indicated by numbers, m2-Air supply type: S indicates air supply type, X indicates suction type condenser code
ZNS200-1: Indicates a nominal condensing area of 200m2, a first-retrofitted air supply condenser. ZNX120 indicates a suction type condenser with a nominal condensing area of 120m2. 4.3 Basic parameters
4.3.1 The nominal condensing area and basic parameters of the condenser shall comply with the provisions of Table 1. Table 1
Nominal condensing area
Nominal heat rejection
Circulating water volume
Supplementary water volume
≤15400
0.24~0.41bZxz.net
4.3.2 Thermal parameters
≤23100
≤30800
0.38~0.630.51~0.86
4.3.2.1 The heat transfer coefficient q of the outer surface of the condenser is ≥1.74kW/m2.4.3. 2.2
≤46200
0.73~1.22
The operating conditions when determining the heat transfer coefficient of the condenser shall comply with the provisions of Table 2. Table 2
Condensing temperature1
Population wet-bulb temperature
Population dry-bulb temperature
Maximum load condition wet-bulb temperature
Fouling coefficient r
4.4 Design conditions
Design pressure: 2MPa;
Design temperature: 75.
5 Technical requirements
5.1 General requirements
≤61600
0.93~1.56
≤77000
1.13~～1.89
1.54~2. 57
The condenser 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 condenser shall have material certificates. 5.2.2 The main material standards used for the condenser shall comply with the provisions of Table 3. 1395
Material name
Standard number
5.3 Condensing coil
GB/T 3091,GB/T 3092.
GB 8162,GB 8163
JB/T7658.5-—95
GB 699,GB 700,
GB 912,GB 1591
GB 5117,
GB5118
5.3.1 Before construction, the condensing tube should be straightened, and the surface oxide scale and dirt should be removed to ensure that the inside of the tube is clean and dry. 5.3.2 The roundness tolerance of the bent tube should not be greater than 15% of the outer diameter of the tube. Welding
GB1300
5.3.3 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. 5.3.4 The condensing coil and bracket should be hot-dip galvanized. 5.4 Water tank
5.4.1 The box body should be made of metal plates with anti-corrosion protective film, stainless steel plates or corrosion-resistant non-metallic plates. The box plate should be flat and smooth. When the box body is made of ordinary steel plates, the oxide scale dirt on the inner and outer surfaces should be removed and anti-corrosion treatment should be carried out. The surface should be smooth and should not have defects such as spots and tumors.
5.4.2 The water tank should be equipped with a drain.
5.4.3 The water tank should not leak.
5.4.4 The float valve and other automatic control components should ensure that the seal is leak-free, and the operation is flexible and without obstruction. 5.5 Fans and pumps
Fans and pumps shall comply with the provisions of relevant standards. 5.6 Water retaining plate
5.6.1 The material shall be galvanized sheet, plastic sheet or fiberglass. 5.6.2 It shall have sufficient rigidity to ensure that the water retaining plate is flat and beautiful. 5.6.3 There shall be no deformation, distortion or mechanical damage, and the appearance shall be smooth. 5.7 Nozzle
5.7.1 The material shall be copper or plastic.
5.7.2 The water spray shall be uniform.
5.7.3 There shall be no leakage at the threaded joints.
5.8 Sealing
5.8.1 The side panel joints and other joints shall be sealed with rubber pads, foam plastics or sealants. 5.8.2 The surface of the sealing pad shall be flat.
5.9 Insulation
The terminals of the motor junction box of the fan and the water pump shall be subjected to insulation resistance test. The insulation resistance between the insulation line and the ground shall not be less than 2MQ (measured by 500V megohmmeter).
5.10 Welding
The welding of the condenser shall be in accordance with the requirements of the drawings and processes. 5.11 Airtightness requirements
The condensing coil of the condenser shall be subjected to airtightness test before assembly, and the test pressure shall be 2MPa. 5.12 Cleanliness
The inside of the condenser shall be clean, and the impurity content in the part in contact with the refrigerant shall not exceed 800mg/m2. 5.13 Appearance quality
The condenser 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 evenly smooth and consistent in color, and there shall be no defects that affect the appearance. 5.14 Completeness
The condenser supplied as a complete set shall also include:
Nitrogen inlet connector;
Ammonia outlet connector;
Blowdown connector;
d. Balancing pipe connector;
Oil drain connector, air drain connector;
Water inlet, outlet and drain connector;
Safety valve connector.
5.15 Accessories
5.15.1 The accessories of the condenser are:
Condensing coil;
JB/T7658.5-95
Water system (including float valve, water pump, water spray pipe, nozzle); air intake manifold (including pressure gauge, safety valve, air intake valve, air vent valve); liquid outlet manifold (including liquid outlet valve, balance valve); upper frame (including fan when the structure is suction type); lower frame (including fan when the structure is supply type). g.
5.15.2 The accessories of the condenser shall comply with the provisions of the relevant standards or drawings. 5.16 Warranty period
If the user complies with the provisions of the product manual, the manufacturer shall replace or repair the condenser free of charge within 18 months from the date of shipment from the manufacturer if the condenser is damaged or fails to work properly due to poor manufacturing. 6 Test methods
6.1 Performance test
The performance test method of condenser can adopt industrial operation test. 6.2 Water tank leak test
After welding, the water tank should be filled with water or kerosene for leak detection, and check that there should be no leakage at the welds of the water tank. 6.3 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 insulated circuit and ground of the motor terminal of the fan and water pump. The value should be not less than 2MQ. 6.4 Airtight test
6.4.1 The gas used for the airtight test should be dry, clean air, nitrogen, or inert gas. 6.4.2 There should be safety measures for the air pressure withstand test, which shall be supervised and inspected by the safety department of the test unit. 6.4.3 The test pressure is 2MPa.
6.4.4 The steps of the airtight test are as follows:
a. 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.
b. If there is leakage, the airtightness test should be repeated after pressure relief and repair. The pressure should remain unchanged during the inspection, and continuous pressure should not be used to maintain the test pressure unchanged. The screws should not be tightened under pressure c.
6.5 Cleanliness determination
The cleanliness determination of the condenser can refer to the provisions of ZBJ73029. 1397
7 Inspection rules
“General requirements
JB/T7658.595
The condenser 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
7.2.1 Inspection classification
The inspection of condensers is divided into factory inspection and type inspection. 7.2.2 Inspection items
The inspection items of condensers shall be in accordance with the provisions of Table 4. Table 4
Inspection items
Performance test
Cleanliness
Processing quality
Water tank leak test
Insulation resistance Test
Appearance quality
Airtight test
Check the contents of the label
Check the completeness of the product according to the factory documents
7.3 Factory inspection
Each condenser should be inspected after it is manufactured. 7.4 Type inspection
Factory inspection
Type inspection
7.4.1 New products of at least condensers or old products that have undergone major reforms should be inspected by type. 7.4.2 The performance test method of the condenser can adopt the industrial operation test. 8 Marking, packaging and transportation
8.1 Marking
8.1.1 Label
The condenser should be A label should be fixed on a conspicuous and flat part. The label should comply with the provisions of GB/T13306 and should indicate the following: a.
Manufacturing unit and trademark;
Product model:
Product name;
Design pressure;
Design temperature;
Condensing area;
Refrigerant;
Fan power, water pump power;
Manufacturing number;
Manufacturing date.
8.1.2 Factory documents
The following factory documents should be carried along with the condenser when it leaves the factory. 8.1.2.1 Product certificate, which includes: a.
Manufacturing unit and Trademark;
Product model;
Product name;
Factory number;
Inspection conclusion;
Signature and seal of the inspector and the 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.
8.1.2.3 Packing list.
8.2 Packing and transportation
JB/T 7658.5—95
8.2.1 The exposed machined surfaces and connecting pipes of the condenser shall be coated with anti-rust agent and sealed. The assembly flange shall be fastened with bolts, and its sealing surface shall be coated with anti-rust grease and sealed.
8.2.2 The condenser can be packed naked or packed. During transportation, attention should be paid to setting up brackets to prevent rolling and movement. During shipment, there should be shipping marks and transport packaging marks.
Additional notes:
This standard was proposed and coordinated 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. 13992 The condenser can be packed in a box or in a bare box. During transportation, it should be fixed with a bracket to prevent rolling and movement. 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. 13992 The condenser can be naked or boxed. During transportation, it should be fixed with a bracket to prevent rolling and movement. During shipment, there should be a shipping mark and a transport packaging mark.
Additional Notes:
This standard was proposed and coordinated 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. 1399
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