This standard replaces JB 454-86 and JB 4346-86. JB/T 7658.16-1995 Ammonia liquid filter for ammonia refrigeration equipment JB/T7658.16-1995 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Ammonia Liquid Filter for Ammonia Refrigeration Equipment
Subject Content and Scope of Application
JB/T 7658. 16--95
Replaces 454-86
JB 4346-86
This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules, marking, packaging and transportation of ammonia liquid filters for ammonia refrigeration equipment (hereinafter referred to as filters). This standard applies to ammonia liquid filters for ammonia refrigeration equipment. 2 Reference standards
GB1300
Ordinary thread tolerances and fits (diameter 1 ~ 355mm) Carbon structural steel
Welding wire
GB/T 1804
GB5117
GB5330
GB8162
GB 8163
General tolerances
Carbon steel welding rods
Unindicated tolerances for linear dimensions
Industrial metal wire woven square hole screen
Structural seamless steel pipes
Seamless steel pipes for conveying fluids
GB/T13306 Label
IB/T 6421
ZB J73 027
3 Terminology
Technical conditions for grey iron castings for refrigeration compressorsGeneral provisions for determination of cleanliness of refrigeration equipment
3.1 Ammonia liquid filter
In the ammonia refrigeration system, it is installed on the liquid pipeline before the throttle valve, float valve or solenoid valve to filter solid impurities in hydrogen liquid and prevent valve blockage or damage.
4 Product classification
4.1 Type
Filters are divided into two types according to their structural type: straight-through steel wire filter type and right-angle steel wire filter type. 4.2 Model
4.2.1 Model representation method
The model of the filter consists of uppercase Chinese pinyin letters and Arabic numerals (hereinafter referred to as numbers). The method of indicating the model is as follows:
Approved by the Ministry of Machinery Industry of the People's Republic of China on 1995-06-16 1444
Implemented on 1996-07-01
4.2.2 Model Example
JB/T7658.16--95
Revision number: Indicated by numbers, omitted for the first design product Product type: Right-angle type is indicated by J, straight-through type is not indicated Nominal diameter of the pipe: Indicated by numbers, mm Filter code
YG20-1: Indicates a nominal diameter of 20mm, the first modified straight-through filter, YG32J-2: Indicates a nominal diameter of 32mm, the second modified right-angle filter. 4.3 Basic parameters
The nominal diameter of the filter pipe shall comply with the provisions of Table 1. Table 1
4.4 Design conditions
Design pressure: 2MPa
Design temperature: 50℃.
5 Technical requirements
General requirements
The filter 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
The main materials used in the filter shall comply with the provisions of Table 2. Table 2
Material name
Standard number
5.3 Filter
GB8162
GB8163
GB1300
GB5117
5.3.1 The filter shall be equipped with a metal filter that is not corroded by the refrigerant and has sufficient flow area. The filter mesh should have no less than 50 holes per 25.4mm.
5.3.2 The metal filter screen of the filter shall comply with the provisions of GB5330. 5.4 Gray iron castings
The gray iron castings of the filter can refer to the provisions of JB/T6421. 5.5 Seamless steel pipes and steel plates
The surface of the seamless steel pipes and steel plates used for the filter should not have defects such as pitting, rust, cracks, etc. 5.6 Head
The head of the filter should be made by rolling the whole steel plate and should not be spliced. 5.7 Flange
The flange surface of the filter should be perpendicular to the main axis of the pipe or cylinder, and its deviation should not exceed 1/100 of the outer diameter of the flange. 1445
5.8 Thread
JB/T 7658.16—95
The precision of various threads shall be manufactured according to the 6-level precision specified in GB197. 5.9 Unindicated tolerances
The unindicated tolerances of the linear dimensions of the filter cutting surface shall be in accordance with the tolerance grade m (medium grade) specified in GB/T1804, and the unindicated tolerances of the linear dimensions of the non-cutting surface shall be in accordance with the tolerance grade c (rough grade) specified in GB/T1804. 5.10 Pressure resistance and airtightness requirements
5.10.1 The filter shall be subjected to pressure resistance test. The hydraulic pressure resistance test pressure shall be 1.25 times the design pressure, and the gas pressure resistance test pressure shall be 1.15 times the design pressure. The pressure holding time shall be not less than 10 minutes, and there shall be no leakage. 5.10.2 The airtightness test shall be carried out only after the filter passes the hydraulic pressure test. The test pressure is equal to the design pressure, and the pressure holding time shall be not less than 10 minutes, and there shall be no leakage. The airtightness test may not be carried out for the filter that has been subjected to the gas pressure test and has passed the inspection. 5.11 Cleanliness
The inside of the filter shall be clean, and the impurity content in the part in contact with the refrigerant shall not exceed 800mg/m. 5.12 Appearance quality
The filter should be beautiful and elegant, the casting surface should be smooth and flat, the outer surface should be painted, the paint color should be harmonious and durable, and there should be no defects that affect the appearance.
5.13 Flow direction mark
The filter should be marked with a striking flow direction arrow. 5.14 CompletenessbZxz.net
The filter supplied as a set should also include:
a. Refrigerant inlet joint;
b. Refrigerant outlet joint,
c. Group assembly flange.
5.15 Warranty period
If the user complies with the provisions of the product manual, within 18 months from the date of shipment from the manufacturer, if the filter is damaged or cannot work normally due to poor manufacturing, the manufacturer shall replace or repair it free of charge. 6 Test methods
6.1 Pressure test
6. 1. 1 Hydraulic pressure test
6.1.1.1 After the filter is manufactured, a hydraulic pressure test shall be carried out. The test medium shall be clean water or other liquids that will not cause danger. The temperature of the liquid during the test shall be much lower than its boiling point or flash point. 6.1.1.2 The test pressure shall be in accordance with the provisions of 5.10.1. 6.1.1.3 Hydraulic pressure test method for filters: Before the test, the fastening bolts of all connecting parts of the filter shall be fully assembled and properly tightened. The dial diameter of the pressure gauge used for the test shall be a.
100mm or more. The pressure test shall 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, an exhaust port shall be set on the top of the filter, and the air in the filter shall be exhausted when filling the liquid. During the test, the filter observation surface shall remain dry.
c. Fill the filter with the test medium, 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. The filter is qualified if there is no leakage or abnormal deformation anywhere. 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.
e. After the hydraulic pressure test is completed, the liquid should be exhausted and dried. 1446
6.1.2 Gas pressure test
JB/T 7658.16—95
6.1.2.1 The gas used for the gas pressure test should be dry, clean air, nitrogen or inert gas. 6.1.2.2 The gas pressure test should have safety measures, which shall be supervised and inspected by the safety department of the test unit. 6.1.2.3 The test pressure shall be in accordance with the provisions of 5.10.1. 6.1.2.4 Filter air pressure withstand test method: The preparation work before the test is the same as that specified in 6.1.1.3a. a.
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 filter is qualified if there is no leakage and abnormal deformation at all locations after inspection with soap solution or other leak detection liquid. If there is a leak, the pressure should be relieved and repaired, and then retested according to the above regulations.
The pressure should remain unchanged during the inspection. Continuous pressurization should not be used to maintain the test pressure unchanged, and the screws should not be tightened under pressure. 6.2 Airtightness test
6.2.1 The airtightness test should be carried out after the hydraulic pressure withstand test is passed. If the filter has been subjected to the air pressure withstand test, the airtightness test can be exempted. The test pressure is equal to the design pressure.
The gas used for the airtightness test should comply with the provisions of 6.1.2.1. 6.2.4 Filter air tightness test method:
Preparation work before the test is the same as that specified in 6.1., 1.3a. 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℃ (or coated with foaming liquid on the outside). b.
If there is leakage, the hydraulic pressure resistance test and air tightness test should be repeated after pressure relief and repair. c.
6.3 Cleanliness determination
The determination of the cleanliness of the filter can refer to the provisions of ZBJ73027. 7 Inspection rules
-General requirements
The filter 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
Inspect casting quality;
Inspect processing quality;
Inspect appearance quality;
Pressure and airtightness test;
Check the contents of the label;
Check the completeness of the product according to the factory documents. 8 Marking, packaging and transportation
8.1 Marking
8.1.1 Label
The filter should be fixed with a label on a conspicuous and flat position. The label should comply with the provisions of GB/T13306. The following contents should be marked on the label:
Manufacturing unit and trademark;
Product model:
Product name;
Design pressure,
Design temperature;
Refrigerant;
g. Net weight;
h. Manufacturing number;
Date of manufacture.
8.1.2 The filter should be accompanied by a product certificate when leaving the factory. 8.2 Packaging and transportation
JB/T7658.16--95
8.2.1 Before packing, the taper joint should be coated with anti-rust grease and then sealed with a screw plug. The flange should be tightened with bolts, and the sealing surface should be coated with anti-rust grease and sealed with a blind plate.
8.2.2 If the filter is supplied as a set with other ammonia refrigeration equipment, it can be packed and transported together with other equipment without separate packaging. If it is supplied separately, it should be well wrapped.
Additional remarks:
This standard was proposed and coordinated 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. 1448
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