JB/T 9058-1999 Method for determination of cleanliness of refrigeration equipment
Some standard content:
JB/T9058--1999
This standard is a revision of ZBJ73027--89 "General Provisions for Cleanliness Determination of Refrigeration Equipment", ZBJ73028-89 "Cleanliness Determination Method for Piston Refrigeration Compressors", and ZBJ73029-89 "Cleanliness Determination Method for Tubular Heat Exchangers for Ammonia Refrigeration Devices". Since the cleanliness determination method of the original standard is limited to piston refrigeration compressors and tubular heat exchangers for ammonia refrigeration devices, this standard adds the sampling position of screw parts and the determination method of tubular heat exchangers. Other types of refrigeration compressors, parts and auxiliary equipment similar products can refer to it.
This standard replaces ZBJ73027--89, ZBJ73028-89, and ZBJ73029--89 from the date of implementation. Appendix A, Appendix B and Appendix C of this standard are all suggestive appendices. This standard is proposed and managed by the National Technical Committee for Standardization of Refrigeration Equipment. This standard was drafted by Dalian Refrigeration Machinery Co., Ltd. The main drafters of this standard are Zhu Hongming, Guo Chenggang, Guo Xixin, Wang Zhiqiang and Wang Xuewei. 178
1 Scope
Machinery Industry Standard of the People's Republic of China
Measuring method of refrigerating equipment cleanliness
Measuring method of refrigerating equipment cleanlinessJB/T9058—1999
Replaces ZBJ73027-89
ZB J73 028—89
ZB J73 029--89
This standard specifies the preparation, cleaning, filtering, drying, weighing, calculation and impurity analysis methods for measuring the cleanliness of refrigerating equipment. This standard is applicable to the cleanliness measurement of refrigerating equipment and its parts. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T679-1994 Chemical reagent ethanol (95%) GB1922-1980 Solvent oil
GB/T6004-1985 Metal wire woven square hole mesh for test sieve 3 Definitions
This standard adopts the following definitions.
3.1 Cleanliness
Refers to the cleanliness of parts, components, and complete machines, expressed by the weight of impurity particles collected from specified parts using specified methods. 3.2 Filter membrane
A filter material made of cellulose nitrate and cellulose acetate with many uniform micropores that does not chemically react with the filtered liquid. 3.3 Constant weight
The process of repeatedly drying and weighing the weight to be measured to achieve a constant weight. 3.4 Cleaning liquid
The liquid used for cleaning is generally clean 120 solvent oil, alcohol, distilled water, etc. 3.5 Turbid liquid
Cleaning liquid containing impurities from the sampling site.
3.6 Particles
Microscopic particles collected from the sampling site. 3.7 Porosity
The diameter of the largest hole on the filter, unit: um. 3.8 Filter membrane porosity
The percentage of water absorbed per unit volume of the filter membrane. 3.9 Filter membrane bubble point pressure
The surface tension of water overcome by gas to displace water from the pores of the filter membrane. 3.10
Filter membrane extraction rate
Approved by the State Machinery Industry Bureau on July 12, 1999, and implemented on January 1, 2000
JB/T9058---1999
The percentage of weight loss of the filter membrane after being immersed in clean 120 solvent oil. 3.11 Cleanliness test room
A closed room for filtering, drying, weighing and analyzing dust fall and temperature controlled within a certain range. 3.12 Clean objects
Objects that have been effectively cleaned, washed and stored in dustproof equipment. 3.13 Dust fall
Refers to the weight of floating particles that fall on a work surface with an area of 1m2 within 24 hours. 3.14 Sampling part
A specific part whose cleanliness directly affects the reliability of the product. 4 General provisions
4.1 The cleanliness of the part is characterized by measuring the cleanliness of the sampling part of the part using the specified cleaning method and the specified cleaning liquid. 4.2 The cleanliness of the refrigeration equipment is characterized by the specified sampling part and cleanliness of the refrigeration equipment. 5 Sampling rules
5.1 Sampling method
5.1.1 Parts
Randomly sampled at the end of the parts machining production line after final cleaning and before oiling; they can also be randomly sampled after cleaning and before assembly on the assembly line.
5.1.2 Components
Randomly sampled at the end of the assembly line after cleaning and before entering the warehouse. 5.1.3 Refrigeration equipment
Randomly sampled at the end of the assembly line after other items are qualified before entering the warehouse; they can also be sampled from the finished products. 5.2 Sampling location
The surface in contact with refrigerant and lubricating oil is the sampling location. 6 Measuring instruments and testing environment
6.1 Measuring instruments
6.1.1 Filter membrane
Refrigeration membrane filtration device can refer to Appendix A (suggested appendix). 6.1.1.1 Specifications and quality requirements
Specifications: porosity 5μm, diameter 50mm, thickness 150μm, weight less than 90mg white filter membrane. Quality requirements: flow rate 400mL/(cm2·min), bubble point pressure 41.2kPa, porosity about 84%, extraction rate less than 0.4%, no pinholes, no transparency, streaks and obvious foreign matter in lamp inspection, etc. 6. 1.1.2 Constant weight
Put the filter membrane into clean 120 solvent oil with tweezers to clean both sides, then put it into a weighing bottle with a lid that has been constant weight, half open the bottle cap and put it into an oven that has been heated to 90℃±5℃, after 60min, cover the bottle cap and take it out, put it in a desiccator to cool for 30min, then take it out and weigh it together with the weighing bottle. Repeat the drying and weighing until the difference between two consecutive values is no more than 0.4mg, and make a record. 6.1.2 Filter
6.1.2.1 Specifications and quality requirements
Specifications: Stainless steel wire mesh or copper wire mesh with a mesh size of 38um. Quality requirements: Should comply with the provisions of GB/T6004. 6.1.2.2 Constant weight
JB/T9058—1999
Put the filter flat in clean 120 solvent oil to clean both sides, take out the filter, wait for the surface cleaning liquid to dry slightly, put it in an oven heated to 105℃±5℃, take it out after 60 minutes, put it in a desiccator to cool for 30 minutes, take it out and weigh it, repeat the drying and weighing until the difference between two consecutive values is no more than 0.4mg, and make a record. 6.1.3 Cleaning fluid
6.1.3.1 Types
a) 120 solvent oil, as specified in GB1922; b) 95% ethanol, as specified in GB/T679; c) distilled water, secondary distillation;
d) washing fluid, selected as specified.
6.1.3.2 Purification
Before use, the cleaning fluid should be filtered using the filter (membrane) selected when determining the cleanliness. 6.1.4 Oven
6.1.4.1 Technical requirements
Use a far-infrared drying oven, with a maximum temperature of 130°C, and the size of the workroom should be selected as required. 6.1.4.2 Usage requirements
Should be kept away from volatile and flammable liquids, the inside of the oven should be kept clean, and operators should not be away from it when in use. 6.1.5 Analytical balance
6.1.5.1 Technical requirements
Maximum weighing 200g, graduation value 0.1mg, automatic weighting, weighing pan diameter not less than 80mm. 6.1.5.2 Usage requirements
The balance should be installed on a stable workbench in a cleanliness testing room without strong magnetic sources, vibration sources, and corrosive gases. The room temperature is 20℃±2℃. It can be used 24 hours after installation. When in use, open the front door 20 minutes before starting to work. 6.1.6 Porcelain floor
6.1.6.1 Specifications
Enameled porcelain crucible with a capacity of 50ml., select as needed. 6.1.6.2 Cleaning
Boil with 50% hydrochloric acid solution for 15 minutes, take out and wash with tap water, and then wash with distilled water 3 times. 6.1.6.3 Constant weight
First dry in an oven at 105℃±5℃, then place in a high temperature furnace and gradually heat to 800℃, take out for 1h, cool in the air for 3min, place in a dryer to cool for 30min, take out and weigh, repeat the drying and weighing until the difference between two consecutive values is no more than 0.4mg, record the reading value.
6.1.7 Vacuum pump
6.1.7.1 Technical requirements
The ultimate vacuum degree is 6.6×10-2Pa
6.1.7.2 Usage requirements
Operate according to the instructions, check the safety valve plate regularly, keep it flat and clean, and avoid foreign matter from entering the pump. 6.1.8 Other instruments
6.1.8.1 Types
Syringes, desiccators, weighing bottles, containers with lids, straws, conical flasks, measuring cylinders, funnels, condensers, white nylon round brushes, flat brushes, paintbrushes, brushes (flat-ended, toothless stainless steel tweezers), bar magnets (one end wrapped with clean cellophane or plastic film), covered sugar porcelain or plastic plates, basins, buckets, sinks of different sizes, and oil-resistant rubber gloves, etc. 6.1.8.2 Cleaning
Clean thoroughly with a synthetic detergent warm water solution, then rinse twice with warm water and three times with distilled water. 181
6.2 Testing environment
JB/T 9058—1999
Cleanliness testing should be carried out in clean or green places, not in windy and sandy places with severe dust, smoke and corrosive gases; when using flammable cleaning fluids, the environment should meet fire prevention requirements and have appropriate fire-fighting facilities. 7 Determination method
7.1 Cleaning
7.1.1 Cleaning method
7.1.1.1 Manual cleaning
Use a quantitative and specified type of cleaning fluid to repeatedly rinse and brush each tested part in a specified manner. 7.1.1.2 Pressure cleaning
Use a quantitative and specified type of cleaning fluid to rinse the tested part at the specified pressure. The pressure washing device can refer to Appendix B (Suggested Appendix).
7.1.2 Cleaning requirements
7.1.2.1 Do not allow impurities in non-sampling areas to enter the cleaning liquid by mistake, and prevent the cleaning liquid from splashing out of the container in any way. 7.1.2.2 During pressure washing, the outlet flow rate should not be reduced to achieve stability. 7.1.2.3 Use clean cleaning liquid to clean all utensils that have come into contact with impurities in the sampling area. 7.2 Cleaning methods for refrigeration compressors
See Table 1 for cleaning methods for refrigeration compressors.
7.3 Cleaning methods for tubular heat exchangers for refrigeration devices See Table 2 for cleaning methods for tubular heat exchangers for refrigeration devices. Table 1
Cylinder head, side cover, bearing seat, machine body, intake and exhaust pipe, intake and exhaust end cover, intake and exhaust end seat and other crankshafts, bearings, cylinder liners, shaft seal components, rotors and other intake and exhaust valve components, energy regulating components, piston connecting rod components
Oil pump, oil filter, intake and exhaust stop valve
Semi-enclosed motor
Lubricating oil
Vertical tube evaporator
Spiral tube evaporator
Air cooler
Evaporative condenser
8 Filter||t t||8.1 Membrane filtration
Sampling location
All inner surfaces and pores
All surfaces and pores
All surfaces and pores (without disassembly)
All parts surfaces (except the outer surfaces of components) Disassembly All surfaces (stator and rotor are not disassembled) All lubricating oil accumulated in all places to be tested
Cleaning method
Cleaning method
Collect the stored lubricating oil, repeatedly brush all
surfaces and pores to be tested, and use a magnet to absorb iron filings in the holes.
Pressure flushing of oil holes and inner cavity
Put down the evaporator (evaporation pipe), install a clean stop valve at both ends of its inlet and outlet, inject cleaning liquid from any end of the inlet and outlet, and quickly discharge it after it is full of bubbles. At the same time, use a copper hammer to tap the welding point of the evaporation pipe, and use a clean liquid storage bucket to collect turbid liquid equivalent to twice the volume of the evaporator. Install a clean stop valve at the lower end interface of the cooler (condenser), inject cleaning liquid from the upper end, and quickly discharge it after it is full of bubbles. Use a clean liquid storage bucket to collect turbid liquid equivalent to four times the volume of the cooler (condenser). 8.1.1 Use a membrane with a porosity of 5m that has been weighed to a constant weight, and inject the turbid liquid into the microporous membrane filtration device. When the turbid liquid is too thick, it can be diluted with clean cleaning liquid. The amount of diluent used is limited to what can pass through the filter membrane quickly. 182
8.1.2 Start the vacuum pump to speed up the filtration speed. 8.1.3 If the filter membrane is blocked or damaged, it should be replaced in time. JB/T9058—1999
8.1.4 After all the turbid liquid is filtered, rinse the inner wall of the funnel with at least 50mL of clean cleaning liquid to transfer the impurities to the filter membrane. 8.1.5 When the traces of cleaning liquid on the filter membrane disappear, stop the vacuum pump and vent. 8.1.6 Carefully remove the filter membrane with impurities with tweezers and place it in a weighing bottle with a lid that has been weighed to a constant weight, ready for drying and weighing. 8.1.7
Put it in the middle.
When the impurities in the turbid liquid are large and numerous, the turbid liquid can be poured into a filter screen that has been weighed to a constant weight, and then introduced into the microporous membrane filter. 8.2 Filter Screen Filtration
When the impurities in the mixed liquid are large and the turbid liquid is too much to be filtered by a filter membrane, a filter screen with a mesh size of 38μm can be used for filtration.
9 Drying, weighing and calculation
9.1 Drying and weighing
Put the weighing bottle with the filter membrane with impurities into the oven, dry and weigh it according to the requirements of 6.1.1.2; put the filter screen with impurities into the oven, dry and weigh it according to the requirements of 6.1.2.2.
9.2 Calculation
The calculation formula of cleanliness is expressed by the weight of impurities in the measured object: m = (mz-mi)+(ma-m3)
Where: m-
The weight of impurities in the measured object, mg;
The constant weight of the weighing bottle and the filter membrane, mg;
The weight of the weighing bottle and the filter membrane with impurities, mg; m The constant weight of the filter screen, mg
The weight of the filter screen with impurities, mg.
10 Impurity analysis
Impurity analysis is generally carried out by weight analysis. 10.1 Principle of gravimetric analysis
Use a magnet and a crucible to measure the weight of iron, inorganic and organic matter by attraction and calcination. 10.2 Determination of iron
Extend the magnet specified in 6.1.8.1 to the weighed impurities to collect iron impurity particles, then weigh the weight of iron removed and calculate the iron content.
10.3 Determination of inorganic matter
Put the impurities except iron into a porcelain crucible of constant weight, calcine and weigh it according to 6.1.6.3, and the weight removed is the weight of inorganic matter.
10.4 Determination of organic matterbzxZ.net
The weight of impurities minus the weight of iron and inorganic matter is the weight of organic matter. 10.5 Cleanliness determination and analysis report
Fill the results in the cleanliness and analysis report according to the contents of Appendix C (suggested appendix). 183
JB/T 9058—1999
Appendix A
(Suggestive Appendix)
Microporous membrane filtration device
1—Funnel with scale, 2—Filter membrane; 3—Filter membrane support frame: 4-Funnel seat; 5—Oil-resistant rubber plug; 6—Suction filter bottle: 7—Metal clamp; 8—Vacuum pump Figure A1
Appendix B
(Suggestive Appendix)
Pressure flushing system
Air compressor; 2-Filter; 3—Liquid storage tank; 1—Cleaning liquid; 5——Pressure gauge: 6——Connecting pipe; 7-Spray gun; 8-Interchangeable nozzle Figure B1
JB/T 9058—1999
(Appendix of Suggestions)
Cleanliness measurement and analysis report
Cleanliness measurement and analysis report should include the following contents: a) product or part model (code), name, number; b) filter element type and porosity;
c) cleaning fluid type and dosage;
d) measurement location and its cleanliness measurement value; e) iron, organic and inorganic content in impurities; f) conclusions and recommendations;
g) measurement date and person’s name.2 Pressure cleaning
Use a quantitative and specified type of cleaning fluid to clean the measured part at the specified pressure. For the pressure cleaning device, refer to Appendix B (the appendix of the reminder).
7.1.2 Cleaning requirements
7.1.2.1 Do not allow impurities in non-sampling parts to be accidentally introduced into the cleaning fluid, and prevent the cleaning fluid from splashing out of the container in any way. 7.1.2.2 During pressure cleaning, the outlet flow rate should not be reduced to achieve stability. 7.1.2.3 Use clean cleaning fluid to clean all utensils that have come into contact with impurities in the sampling part. 7.2 Cleaning methods for refrigeration compressors
See Table 1 for cleaning methods for refrigeration compressors.
7.3 Cleaning methods for tubular heat exchangers for refrigeration devices See Table 2 for cleaning methods for tubular heat exchangers for refrigeration devices. Table 1
Cylinder head, side cover, bearing seat, machine body, intake and exhaust pipe, intake and exhaust end cover, intake and exhaust end seat, etc. crankshaft, bearing, cylinder liner, shaft seal parts, rotor and other intake and exhaust valve parts, energy regulating parts, piston connecting rod parts
Oil pump, oil filter, intake and exhaust stop valve
Semi-enclosed motor
Lubricating oil
Vertical tube evaporator
Spiral tube evaporator
Air cooler
Evaporative condenser
8 Filter||t t||8.1 Membrane filtration
Sampling location
All inner surfaces and pores
All surfaces and pores
All surfaces and pores (without disassembly)
All parts surfaces (except the outer surfaces of components) Disassembly All surfaces (stator and rotor are not disassembled) All lubricating oil accumulated in all places to be tested
Cleaning method
Cleaning method
Collect the stored lubricating oil, repeatedly brush all
surfaces and pores to be tested, and use a magnet to absorb iron filings in the holes.
Pressure flushing of oil holes and inner cavity
Put down the evaporator (evaporation pipe), install a clean stop valve at both ends of its inlet and outlet, inject cleaning liquid from any end of the inlet and outlet, and quickly discharge it after it is full of bubbles. At the same time, use a copper hammer to tap the welding point of the evaporation pipe, and use a clean liquid storage bucket to collect turbid liquid equivalent to twice the volume of the evaporator. Install a clean stop valve at the lower end interface of the cooler (condenser), inject cleaning liquid from the upper end, and quickly discharge it after it is full of bubbles. Use a clean liquid storage bucket to collect turbid liquid equivalent to four times the volume of the cooler (condenser). 8.1.1 Use a membrane with a porosity of 5m that has been weighed to a constant weight, and inject the turbid liquid into the microporous membrane filtration device. When the turbid liquid is too thick, it can be diluted with clean cleaning liquid. The amount of diluent used is limited to what can pass through the filter membrane quickly. 182
8.1.2 Start the vacuum pump to speed up the filtration speed. 8.1.3 If the filter membrane is blocked or damaged, it should be replaced in time. JB/T9058—1999
8.1.4 After all the turbid liquid is filtered, rinse the inner wall of the funnel with at least 50mL of clean cleaning liquid to transfer the impurities to the filter membrane. 8.1.5 When the traces of cleaning liquid on the filter membrane disappear, stop the vacuum pump and vent. 8.1.6 Carefully remove the filter membrane with impurities with tweezers and place it in a weighing bottle with a lid that has been weighed to a constant weight, ready for drying and weighing. 8.1.7
Put it in the middle.
When the impurities in the turbid liquid are large and numerous, the turbid liquid can be poured into a filter screen that has been weighed to a constant weight, and then introduced into the microporous membrane filter. 8.2 Filter Screen Filtration
When the impurities in the mixed liquid are large and the turbid liquid is too much to be filtered by a filter membrane, a filter screen with a mesh size of 38μm can be used for filtration.
9 Drying, weighing and calculation
9.1 Drying and weighing
Put the weighing bottle with the filter membrane with impurities into the oven, dry and weigh it according to the requirements of 6.1.1.2; put the filter screen with impurities into the oven, dry and weigh it according to the requirements of 6.1.2.2.
9.2 Calculation
The calculation formula of cleanliness is expressed by the weight of impurities in the measured object: m = (mz-mi)+(ma-m3)
Where: m-
The weight of impurities in the measured object, mg;
The constant weight of the weighing bottle and the filter membrane, mg;
The weight of the weighing bottle and the filter membrane with impurities, mg; m The constant weight of the filter screen, mg
The weight of the filter screen with impurities, mg.
10 Impurity analysis
Impurity analysis is generally carried out by weight analysis. 10.1 Principle of gravimetric analysis
Use a magnet and a crucible to measure the weight of iron, inorganic and organic matter by attraction and calcination. 10.2 Determination of iron
Extend the magnet specified in 6.1.8.1 to the weighed impurities to collect iron impurity particles, then weigh the weight of iron removed and calculate the iron content.
10.3 Determination of inorganic matter
Put the impurities except iron into a porcelain crucible of constant weight, calcine and weigh it according to 6.1.6.3, and the weight removed is the weight of inorganic matter.
10.4 Determination of organic matter
The weight of impurities minus the weight of iron and inorganic matter is the weight of organic matter. 10.5 Cleanliness determination and analysis report
Fill the results in the cleanliness and analysis report according to the contents of Appendix C (suggested appendix). 183
JB/T 9058—1999
Appendix A
(Suggestive Appendix)
Microporous membrane filtration device
1—Funnel with scale, 2—Filter membrane; 3—Filter membrane support frame: 4-Funnel seat; 5—Oil-resistant rubber plug; 6—Suction filter bottle: 7—Metal clamp; 8—Vacuum pump Figure A1
Appendix B
(Suggestive Appendix)
Pressure flushing system
Air compressor; 2-Filter; 3—Liquid storage tank; 1—Cleaning liquid; 5——Pressure gauge: 6——Connecting pipe; 7-Spray gun; 8-Interchangeable nozzle Figure B1
JB/T 9058—1999
(Appendix of Suggestions)
Cleanliness measurement and analysis report
Cleanliness measurement and analysis report should include the following contents: a) product or part model (code), name, number; b) filter element type and porosity;
c) cleaning fluid type and dosage;
d) measurement location and its cleanliness measurement value; e) iron, organic and inorganic content in impurities; f) conclusions and recommendations;
g) measurement date and person’s name.2 Pressure cleaning
Use a quantitative and specified type of cleaning fluid to clean the measured part at the specified pressure. For the pressure cleaning device, refer to Appendix B (the appendix of the prompt).
7.1.2 Cleaning requirements
7.1.2.1 Do not allow impurities in non-sampling parts to be accidentally introduced into the cleaning fluid, and prevent the cleaning fluid from splashing out of the container in any way. 7.1.2.2 During pressure cleaning, the outlet flow rate should not be reduced to achieve stability. 7.1.2.3 Use clean cleaning fluid to clean all utensils that have come into contact with impurities in the sampling part. 7.2 Cleaning methods for refrigeration compressors
See Table 1 for cleaning methods for refrigeration compressors.
7.3 Cleaning methods for tubular heat exchangers for refrigeration devices See Table 2 for cleaning methods for tubular heat exchangers for refrigeration devices. Table 1
Cylinder head, side cover, bearing seat, machine body, intake and exhaust pipe, intake and exhaust end cover, intake and exhaust end seat and other crankshafts, bearings, cylinder liners, shaft seal components, rotors and other intake and exhaust valve components, energy regulating components, piston connecting rod components
Oil pump, oil filter, intake and exhaust stop valve
Semi-enclosed motor
Lubricating oil
Vertical tube evaporator
Spiral tube evaporator
Air cooler
Evaporative condenser
8 Filter||t t||8.1 Membrane filtration
Sampling location
All inner surfaces and pores
All surfaces and pores
All surfaces and pores (without disassembly)
All parts surfaces (except the outer surfaces of components) Disassembly All surfaces (stator and rotor are not disassembled) All lubricating oil accumulated in all places to be tested
Cleaning method
Cleaning method
Collect the stored lubricating oil, repeatedly brush all
surfaces and pores to be tested, and use a magnet to absorb iron filings in the holes.
Pressure flushing of oil holes and inner cavity
Put down the evaporator (evaporation pipe), install a clean stop valve at both ends of its inlet and outlet, inject cleaning liquid from any end of the inlet and outlet, and quickly discharge it after it is full of bubbles. At the same time, use a copper hammer to tap the welding point of the evaporation pipe, and use a clean liquid storage bucket to collect turbid liquid equivalent to twice the volume of the evaporator. Install a clean stop valve at the lower end interface of the cooler (condenser), inject cleaning liquid from the upper end, and quickly discharge it after it is full of bubbles. Use a clean liquid storage bucket to collect turbid liquid equivalent to four times the volume of the cooler (condenser). 8.1.1 Use a membrane with a porosity of 5m that has been weighed to a constant weight, and inject the turbid liquid into the microporous membrane filtration device. When the turbid liquid is too thick, it can be diluted with clean cleaning liquid. The amount of diluent used is limited to what can pass through the filter membrane quickly. 182
8.1.2 Start the vacuum pump to speed up the filtration speed. 8.1.3 If the filter membrane is blocked or damaged, it should be replaced in time. JB/T9058—1999
8.1.4 After all the turbid liquid is filtered, rinse the inner wall of the funnel with at least 50mL of clean cleaning liquid to transfer the impurities to the filter membrane. 8.1.5 When the traces of cleaning liquid on the filter membrane disappear, stop the vacuum pump and vent. 8.1.6 Carefully remove the filter membrane with impurities with tweezers and place it in a weighing bottle with a lid that has been weighed to a constant weight, ready for drying and weighing. 8.1.7
Put it in the middle.
When the impurities in the turbid liquid are large and numerous, the turbid liquid can be poured into a filter screen that has been weighed to a constant weight, and then introduced into the microporous membrane filter. 8.2 Filter Screen Filtration
When the impurities in the mixed liquid are large and the turbid liquid is too much to be filtered by a filter membrane, a filter screen with a mesh size of 38μm can be used for filtration.
9 Drying, weighing and calculation
9.1 Drying and weighing
Put the weighing bottle with the filter membrane with impurities into the oven, dry and weigh it according to the requirements of 6.1.1.2; put the filter screen with impurities into the oven, dry and weigh it according to the requirements of 6.1.2.2.
9.2 Calculation
The calculation formula of cleanliness is expressed by the weight of impurities in the measured object: m = (mz-mi)+(ma-m3)
Where: m-
The weight of impurities in the measured object, mg;
The constant weight of the weighing bottle and the filter membrane, mg;
The weight of the weighing bottle and the filter membrane with impurities, mg; m The constant weight of the filter screen, mg
The weight of the filter screen with impurities, mg.
10 Impurity analysis
Impurity analysis is generally carried out by gravimetric analysis. 10.1 Principle of Gravimetric Analysis
Use a magnet and a crucible to measure the weight of iron, inorganic and organic matter by attraction and calcination. 10.2 Determination of Iron
Extend the magnet specified in 6.1.8.1 to the weighed impurities to collect iron impurity particles, then weigh the weight of iron removed and calculate the iron content.
10.3 Determination of Inorganic Matter
Put the impurities except iron into a constant weight porcelain crucible, calcine and weigh it according to 6.1.6.3. The weight removed is the weight of inorganic matter.
10.4 Determination of Organic Matter
The weight of impurities minus the weight of iron and inorganic matter is the weight of organic matter. 10.5 Cleanliness Determination and Analysis Report
Fill the results into the cleanliness and analysis report according to the contents of Appendix C (Suggested Appendix). 183
JB/T 9058—1999
Appendix A
(Suggestive Appendix)
Microporous membrane filtration device
1—Funnel with scale, 2—Filter membrane; 3—Filter membrane support frame: 4-Funnel seat; 5—Oil-resistant rubber plug; 6—Suction filter bottle: 7—Metal clamp; 8—Vacuum pump Figure A1
Appendix B
(Suggestive Appendix)
Pressure flushing system
Air compressor; 2-Filter; 3—Liquid storage tank; 1—Cleaning liquid; 5—Pressure gauge: 6—Connecting pipe; 7-Spray gun; 8-Interchangeable nozzle Figure B1
JB/T 9058—1999
(Appendix of Suggestions)
Cleanliness measurement and analysis report
Cleanliness measurement and analysis report should include the following contents: a) product or part model (code), name, number; b) filter element type and porosity;
c) cleaning fluid type and dosage;
d) measurement location and its cleanliness measurement value; e) iron, organic and inorganic content in impurities; f) conclusions and recommendations;
g) measurement date and person’s name.3 If the filter membrane is blocked or damaged, it should be replaced in time. JB/T9058—1999
8.1.4 After all the turbid liquid is filtered, rinse the inner wall of the funnel with at least 50mL of clean cleaning liquid to transfer the impurities to the filter membrane. 8.1.5 When the traces of cleaning liquid on the filter membrane disappear, stop the vacuum pump and vent. 8.1.6 Carefully remove the filter membrane with impurities with tweezers and place it in a weighing bottle with a lid that has been weighed to a constant weight, ready for drying and weighing. 8.1.7
Put it in the middle.
When the impurities in the turbid liquid are large and numerous, the turbid liquid can be poured into a filter screen that has been weighed to a constant weight, and then introduced into the microporous membrane filter. 8.2 Filter Screen Filtration
When the impurities in the mixed liquid are large and the turbid liquid is too much to be filtered by a filter membrane, a filter screen with a mesh size of 38μm can be used for filtration.
9 Drying, weighing and calculation
9.1 Drying and weighing
Put the weighing bottle with the filter membrane with impurities into the oven, dry and weigh it according to the requirements of 6.1.1.2; put the filter screen with impurities into the oven, dry and weigh it according to the requirements of 6.1.2.2.
9.2 Calculation
The calculation formula of cleanliness is expressed by the weight of impurities in the measured object: m = (mz-mi)+(ma-m3)
Where: m-
The weight of impurities in the measured object, mg;
The constant weight of the weighing bottle and the filter membrane, mg;
The weight of the weighing bottle and the filter membrane with impurities, mg; m The constant weight of the filter screen, mg
The weight of the filter screen with impurities, mg.
10 Impurity analysis
Impurity analysis is generally carried out by weight analysis. 10.1 Principle of Gravimetric Analysis
Use a magnet and a crucible to measure the weight of iron, inorganic and organic matter by attraction and calcination. 10.2 Determination of Iron
Extend the magnet specified in 6.1.8.1 to the weighed impurities to collect iron impurity particles, then weigh the weight of iron removed and calculate the iron content.
10.3 Determination of Inorganic Matter
Put the impurities except iron into a constant weight porcelain crucible, calcine and weigh it according to 6.1.6.3. The weight removed is the weight of inorganic matter.
10.4 Determination of Organic Matter
The weight of impurities minus the weight of iron and inorganic matter is the weight of organic matter. 10.5 Cleanliness Determination and Analysis Report
Fill the results into the cleanliness and analysis report according to the contents of Appendix C (Suggested Appendix). 183
JB/T 9058—1999
Appendix A
(Suggestive Appendix)
Microporous membrane filtration device
1—Funnel with scale, 2—Filter membrane; 3—Filter membrane support frame: 4-Funnel seat; 5—Oil-resistant rubber plug; 6—Suction filter bottle: 7—Metal clamp; 8—Vacuum pump Figure A1
Appendix B
(Suggestive Appendix)
Pressure flushing system
Air compressor; 2-Filter; 3—Liquid storage tank; 1—Cleaning liquid; 5—Pressure gauge: 6—Connecting pipe; 7-Spray gun; 8-Interchangeable nozzle Figure B1
JB/T 9058—1999
(Appendix of Suggestions)
Cleanliness measurement and analysis report
Cleanliness measurement and analysis report should include the following contents: a) product or part model (code), name, number; b) filter element type and porosity;
c) cleaning fluid type and dosage;
d) measurement location and its cleanliness measurement value; e) iron, organic and inorganic content in impurities; f) conclusions and recommendations;
g) measurement date and person’s name.3 If the filter membrane is blocked or damaged, it should be replaced in time. JB/T9058—1999
8.1.4 After all the turbid liquid is filtered, rinse the inner wall of the funnel with at least 50mL of clean cleaning liquid to transfer the impurities to the filter membrane. 8.1.5 When the traces of cleaning liquid on the filter membrane disappear, stop the vacuum pump and vent. 8.1.6 Carefully remove the filter membrane with impurities with tweezers and place it in a weighing bottle with a lid that has been weighed to a constant weight, ready for drying and weighing. 8.1.7
Put it in the middle.
When the impurities in the turbid liquid are large and numerous, the turbid liquid can be poured into a filter screen that has been weighed to a constant weight, and then introduced into the microporous membrane filter. 8.2 Filter Screen Filtration
When the impurities in the mixed liquid are large and the turbid liquid is too much to be filtered by a filter membrane, a filter screen with a mesh size of 38μm can be used for filtration.
9 Drying, weighing and calculation
9.1 Drying and weighing
Put the weighing bottle with the filter membrane with impurities into the oven, dry and weigh it according to the requirements of 6.1.1.2; put the filter screen with impurities into the oven, dry and weigh it according to the requirements of 6.1.2.2.
9.2 Calculation
The calculation formula of cleanliness is expressed by the weight of impurities in the measured object: m = (mz-mi)+(ma-m3)
Where: m-
The weight of impurities in the measured object, mg;
The constant weight of the weighing bottle and the filter membrane, mg;
The weight of the weighing bottle and the filter membrane with impurities, mg; m The constant weight of the filter screen, mg
The weight of the filter screen with impurities, mg.
10 Impurity analysis
Impurity analysis is generally carried out by weight analysis. 10.1 Principle of gravimetric analysis
Use a magnet and a crucible to measure the weight of iron, inorganic and organic matter by attraction and calcination. 10.2 Determination of iron
Extend the magnet specified in 6.1.8.1 to the weighed impurities to collect iron impurity particles, then weigh the weight of iron removed and calculate the iron content.
10.3 Determination of inorganic matter
Put the impurities except iron into a porcelain crucible of constant weight, calcine and weigh it according to 6.1.6.3, and the weight removed is the weight of inorganic matter.
10.4 Determination of organic matter
The weight of impurities minus the weight of iron and inorganic matter is the weight of organic matter. 10.5 Cleanliness determination and analysis report
Fill the results in the cleanliness and analysis report according to the contents of Appendix C (suggested appendix). 183
JB/T 9058—1999
Appendix A
(Suggestive Appendix)
Microporous membrane filtration device
1—Funnel with scale, 2—Filter membrane; 3—Filter membrane support frame: 4-Funnel seat; 5—Oil-resistant rubber plug; 6—Suction filter bottle: 7—Metal clamp; 8—Vacuum pump Figure A1
Appendix B
(Suggestive Appendix)
Pressure flushing system
Air compressor; 2-Filter; 3—Liquid storage tank; 1—Cleaning liquid; 5——Pressure gauge: 6——Connecting pipe; 7-Spray gun; 8-Interchangeable nozzle Figure B1
JB/T 9058—1999
(Appendix of Suggestions)
Cleanliness measurement and analysis report
Cleanliness measurement and analysis report should include the following contents: a) product or part model (code), name, number; b) filter element type and porosity;
c) cleaning fluid type and dosage;
d) measurement location and its cleanliness measurement value; e) iron, organic and inorganic content in impurities; f) conclusions and recommendations;
g) measurement date and person’s name.
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