JB/T 7658.1-1995 Water-sprayed condensers for ammonia refrigeration equipment
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Water-sprayed condensers for ammonia refrigeration units
1 Subject content and scope of application
JB/T7658.1-—95
JB 466-86
Replaces JB4340—86
JB4350—86
This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of water-sprayed condensers for ammonia refrigeration units (hereinafter referred to as condensers). This standard applies to water-sprayed condensers for ammonia refrigeration units. 2 Reference standards
GB 1300
GB1591
Technical conditions for high-quality carbon structural steel
Carbon structural steel
Welding steel wire
Low alloy structural steel
GB/T 1804
GB 5117
GB 5118
GB6654
GB8162
GB 8163
General tolerances Unindicated tolerances for linear dimensions
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 Labels
ZBJ73029 Method for determination of cleanliness of tubular heat exchangers for refrigeration equipment 3 Terminology
3.1 Water-spraying condenser
A heat exchanger that condenses compressed high-pressure ammonia into liquid by pouring water on the outer surface of the condensing group in the atmosphere. 4 Product classification
4.1 Type
According to its structural type, the condenser is divided into two types: horizontal tube type and threaded tube type. 4.2 Model
The model of the condenser consists of uppercase Chinese phonetic letters and Arabic numerals (hereinafter referred to as numbers). The method of indicating its model is as follows:
Approved by the Ministry of Machinery Industry of the People's Republic of China on 1995-06-16 and implemented on 1996-07-01
4.2.1 Model Example
JB/T7658.195
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 Code for condenser: SN indicates horizontal tube type, XN indicates spiral tube type SN90-1: Indicates a horizontal tube condenser with a nominal condensing area of 90m2, the second retrofit. XN100: Indicates a spiral tube condenser with a nominal condensing area of 100m2. 4.3 Basic parameters
4.3.1 The nominal condensing area of the horizontal tube condenser shall comply with the provisions of Table 1. Table 1
4.3.2 The nominal condensing area of the spiral tube condenser shall comply with the provisions of Table 2. Table 2
Heat transfer coefficient of the outer surface of the condenser K≥700W/(m2·℃). 4.3.2.1
The operating conditions for measuring the heat transfer coefficient of the condenser shall comply with the provisions of Table 3. 4.3.2.2
Condensation temperature tk
Water inlet temperature wlbzxZ.net
Wet bulb temperature.
Cooling water volume√
Fouling coefficient r
4.4 Design conditions
Water side (steel pipe)
Design pressure: 2MPa;
Design temperature: 75℃.
5 Technical requirements
5.1 General requirements
m*/(h·kw)
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 4. 1374
Material name
Standard number
GB 8162, GB 8163
5.3 Unindicated tolerances
JB/T7658.1--95
GB 699, GB 700, GB 1591, GB 6654 Welding
GB5117.GB5118
GB1300
The unindicated tolerances of the machined surface shall comply with the provisions of tolerance grade m (medium grade) in GB/T1804. The unindicated tolerances of the non-machined surface shall comply with the provisions of tolerance grade c (rough grade). 5.4 Condenser pipe group
5.4.1 Before construction, the condenser pipe should be straightened, and the surface oxide scale and dirt should be removed to ensure that the inside of the pipe is clean and dry. 5.4.2 The roundness tolerance of the bent pipe should not be greater than 15% of the outer diameter of the pipe. 5.4.3 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. 5.4.4 The condenser pipe group and the support should be welded and fixed. 5.5 Welding
The welding of the condenser should comply with the requirements of the drawings and processes. 5.6 Assembly technical requirements
5.6.1 During assembly, the flange surface of the pipe should be perpendicular to the main axis of the pipe. The installation of the pipe flange should ensure that the flange surface is horizontal or vertical, and the deviation should not exceed 1% of the outer diameter of the flange and should not exceed 3mm. 5.6.2 The water trough should be installed flat, and the longitudinal bending should not exceed 10mm within the entire length. 5.7 Pressure resistance and airtightness requirements
All parts of the condenser in contact with the refrigerant shall be subjected to pressure resistance test and airtightness test, and airtightness test shall be carried out after assembly. 5.8 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. 5.9 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 shiny, without defects that affect the appearance. 5.10 Completeness
The condenser supplied as a complete set shall also include:
Ammonia inlet joint;
Nitrogen outlet joint,
Water inlet joint;
Ammonia vent joint, pressure gauge joint;
Oil drain joint, sewage drain joint;
Balance pipe joint;
Water spout;
Assembly flange.
5.11 Accessories
5.11.1 The accessories of the condenser are:
Pressure gauge;
Ammonia valve;
Anchor bolts.
5.11.2 The accessories of the condenser shall comply with the provisions of the relevant standards. 5.12 Warranty period
JB/T 7658.1—95
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 method
6.1 Performance test
The performance test method of the condenser can adopt industrial operation test. 6.2 Pressure resistance and airtightness test
6.2. 1 Pressure resistance test
6.2.1.1 Hydraulic pressure resistance test
6.2.1.1.1 After the condenser is manufactured, a hydraulic pressure resistance test shall be carried out. The test medium shall be clean water or other liquids that will not cause danger. The liquid temperature during the test shall be much lower than its boiling point or flash point. 6.2.1.1.2 The test pressure shall be 1.25 times the design pressure. 6.2.1.1.3 Hydraulic pressure resistance test method for condenser: a. Before the test, the fastening bolts of each connection part of the condenser should be fully assembled and properly tightened. The dial diameter of the test pressure gauge should be above 100mn. Two pressure gauges with the same range and calibrated and within the validity period should be used for the pressure test. 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 on the top of the condenser, and the air in the filter should be exhausted when filling the liquid. The observation surface of the condenser should be kept dry during the test.
c Fill the condenser with the test medium and exhaust the air, then slowly pressurize to the test pressure, maintain the pressure for 10 minutes, and then reduce it to the design pressure. Check under the design pressure, and the condenser is qualified if there is no leakage and abnormal deformation in any part. d. The pressure should remain unchanged during the inspection. 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.
6.2.1.2 Gas pressure withstand test
6.2.1.2.1 The gas used for the gas pressure withstand test shall be dry, clean air, nitrogen or inert gas. 6.2.1.2.2 The gas pressure withstand test shall have safety measures, which shall be supervised and inspected by the safety department of the test unit. 6.2.1.2.3 The test pressure shall be 1.15 times the design pressure. 6.2.1.2.4 Condenser gas pressure withstand test method: a. Preparation work before the test and 6.2.1.1.The same as the provisions of 3a. 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, the condenser is qualified if there is no leakage and abnormal deformation at all places after being checked with soap solution or other leak detection liquid. If there is leakage, the pressure should be relieved and repaired, and then retested according to the above provisions.
C. The pressure should remain unchanged during the inspection. The practice of continuous pressure increase to maintain the test pressure unchanged should not be adopted, and the bolts should not be tightened under pressure.
6.2.2 Airtightness test
6.2.2.1 The airtightness test should be carried out after the hydraulic pressure test is passed. If the condenser has been subjected to the gas pressure test, the airtightness test can be exempted. 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 comply with the provisions of 6.2.1.2.1. 6.2.2.4 Condenser airtightness test method:
9. The preparation work before the test is the same as the provisions of 6.2.1.1.3a. 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 not lower than 5℃ (or coated with foaming liquid on the outside). If there is no bubble, it is qualified.
If there is leakage, the pressure test and airtightness test should be repeated after the pressure is released and repaired. c
6.3 Cleanliness determination
JB/T 7658. 1--95
The cleanliness determination of the condenser can refer to the provisions of ZBJ73029. 7 Inspection rules
7.1 General requirements
The condenser should be inspected by the technical inspection department of the manufacturer according to 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 condenser is divided into two categories: factory inspection and type inspection. 7.2.2 Inspection items
The inspection items of the condenser should be in accordance with the provisions of Table 5. Table 5
Inspection items
Performance test
Cleanliness
Processing quality
Appearance quality
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 condenser should be inspected after it is manufactured. 7.4 Type inspection
Factory inspection
Type inspection
7.4.1 Type inspection should be carried out for new products of at least one specification of condenser or old products that have undergone major reforms. 7.4.2 The performance test method of condenser can adopt industrial operation test. 8 Marking, packaging and transportation
8.1 Marking
8.1.1 Label
A label should be fixed on the condenser in a conspicuous and flat position. The label should comply with the provisions of GB/T13306 and the following contents should be marked on the label:
Manufacturing unit and trademark;
Product model:
Product name,
Design pressure;
Design temperature;
Condensing area;
Refrigerant;
Net weight;
Manufacturing number;
Manufacturing date.
8.1.2 Factory documents
The following factory documents should be carried with the condenser 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 7658.1—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 fix it to prevent rolling and moving. When shipping, there should be shipping marks and transportation packaging marks.
Additional instructions:
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: Li Muzhen, Ha Hongbo, Sun Zhengguo, and Hu Zengwu. This standard was first issued in January 1964 and revised for the first time in December 1986. 13781 The exposed machined surfaces and connecting pipes of the condenser should be coated with anti-rust agent and sealed. The assembly flange should be fastened with bolts, and its sealing surface should be coated with anti-rust grease and sealed.
8.2.2 The condenser can be naked or packed. During transportation, it should be fixed with a bracket to prevent rolling and movement. When shipping, there should be a shipping mark and a transport packaging mark.
Additional instructions:
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: Li Muzhen, Ha Hongbo, Sun Zhengguo, and Hu Zengwu. This standard was first issued in January 1964 and revised for the first time in December 1986. 13781 The exposed machined surfaces and connecting pipes of the condenser should be coated with anti-rust agent and sealed. The assembly flange should be fastened with bolts, and its sealing surface should be coated with anti-rust grease and sealed.
8.2.2 The condenser can be naked or packed. During transportation, it should be fixed with a bracket to prevent rolling and movement. When shipping, there should be a shipping mark and a transport packaging mark.
Additional instructions:
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: Li Muzhen, Ha Hongbo, Sun Zhengguo, and Hu Zengwu. This standard was first issued in January 1964 and revised for the first time in December 1986. 1378
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