HG/T 2352-1992 Wire wound filter element for magnetic slurry filtration
Some standard content:
Chemical Industry Standard of the People's Republic of China
Wire-wound filter element for magnetic slurry filtration
Subject content and scope of application
This standard specifies the technical requirements, test methods and inspection rules for wire-wound filter elements for magnetic slurry filtration. This standard applies to filter elements for magnetic slurry filtration in the magnetic recording industry 2 Reference standards
GB6388 Shipping and receiving marks for transport packaging
GJB420 Solid contamination classification of oil for aircraft hydraulic system HG/T2353.1 Filter element for magnetic slurry filtration filtration accuracy test method HG/T2353.2 Filter element for magnetic slurry filtration flow test method HG/T2353.3 Filter element for magnetic slurry filtration
Dirty holding capacity test method
HG/T2353.4. Compatibility test method for filter element for magnetic slurry filtration HG/T2353.5 Compressive strength test method for filter element for magnetic slurry filtration 3 Terminology
3.1 Maximum particle passing rate
When the filtration efficiency for a certain size particle reaches 99%, this size is the maximum particle passing rate. 3.2 Initial filtration accuracy
When the filtration efficiency for a certain size particle reaches 95%, this size is the initial filtration accuracy. 3.3 Nominal accuracy
Nominal initial filtration accuracy grade of the filter element. 3.4 Flow rate
Under a given pressure drop, the volume of the test liquid passing through the clean filter element per unit time. 3.5 Pressure resistance
The maximum working pressure difference that the filter element can withstand. 3.6 Contamination concentrationwwW.bzxz.Net
The number of particles of the specified size contained in every 100mL of test liquid. 3.7 Cleanliness
The degree of contamination of the filter element itself.
3.8 Dirt holding capacity
The amount of impurities that the filter element can accommodate during its service life (expressed in grams). 3.9 Apparent dirt holding capacity
The total amount of test powder added when the pressure drop of the test system reaches the rated value. 3.10 Compatibility
Under given conditions, the filter element does not produce a decrease in filtration performance after contact with a specified liquid. Approved by the Ministry of Chemical Industry of the People's Republic of China on July 20, 1992, and implemented on March 1, 1993. 4 Product classification HG/T2352-92 4.1 Wire-wound filter elements are divided into three types according to the type of filter material: polypropylene fiber (polypropylene) wire-wound filter element
absorbent cotton wire-wound filter element
polyacrylonitrile fiber (nylon) wire-wound filter element 4.2 The nominal accuracy series of filter elements include 0.5, 0.8, 1, 3, 5, 10, and 20zm. 5 Technical requirements 5.1 Appearance The appearance of the filter element shall not have obvious defects. The filter element and filter wire should have uniform diameter, be arranged neatly, and have flat ends. 5.2 Dimensions and Form and Position Tolerances
5.2.1 Dimensions
The filter element dimensions are shown in the figure below.
The standard length of the filter element is 250mm, and the lengthened filter element increases in multiples of 250mm, i.e. 500, 750, 1000rum. 5.2.2 Form and Position Tolerances
Straightness: The straightness tolerance of the 250mm length filter element is 1.5mm; the tolerance of the 500mm length filter element is 3mm. a.
Verticality: The verticality tolerance of the two ends of the 250mm length filter element facing the axis is 1mm; the tolerance of the 500mm length filter element is b.
5.3 Filtration Performance
The filtration performance of each nominal precision filter element shall comply with the technical requirements specified in Table 1. Technical Index Table 1
Nominal accuracy, uim
Maximum size of particles, um
Initial accuracy, um
Drinking water
Flow rate L/min
Pollution holding capacity, g
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Compressive strength, MPa
Cleanliness, grade
Compatibility
HG/T2352-92
Continued Table 1
Note: The flow value listed in Table 1 is the flow rate when the pressure drop is 0.015MPa. The acrylic fiber wire-wound filter element is 1.3 times higher than the tabulated value; the absorbent cotton wire-wound filter element is 0.6 times the tabulated value.
6 Test method
6.1 Appearance
The appearance quality inspection of the filter element adopts the self-test method, 6.2 Straightness
Put the filter element on the inspection platform, roll it along the circumference and check the maximum gap, insert the feeler gauge into the gap to measure the difference, 6.3 Verticality
Put the filter element upright on the inspection platform, make the angle ruler close to the outer surface of the filter element, and check the verticality of the filter element axis and the two end surfaces, 6.4 Maximum size particle passing degree
. The maximum size particle passing degree of the filter element is tested according to the method specified in HG/T2353.1. 6.5 Initial accuracy
The initial accuracy of the filter element is tested according to the method specified in HG/T2353.1. 6.6 Flow
The filter element filtration flow is tested according to the method specified in HG/T2353.2. 6.7 Dirt Holding Capacity
The filter element dirt holding capacity is tested according to the method specified in HG/T2353.3. 6.8 Pressure Resistance
The filter element pressure resistance is tested according to the method specified in HG/T2353.5. 6.9 Compatibility
The filter element compatibility is tested according to the method specified in HG/T2353.4. 6.10 Cleanliness
First, determine the C value according to the method in Chapter 6 of HG/T2353.1, and then determine the filter element cleanliness according to the provisions of GJB420. 7
Inspection Rules
Product inspection is divided into factory inspection (delivery inspection) and type inspection (routine inspection). 7.1 Factory Inspection
Products must undergo quality inspection before leaving the factory. Factory inspection is conducted by the technical inspection (quality supervision) department of the manufacturer. If necessary, it can be conducted jointly by the supply and demand parties.
7.2 Type Inspection
A comprehensive assessment of product quality is called type inspection, which is conducted by the technical inspection department of the manufacturer item by item according to the technical requirements specified in this standard.
When one of the following situations occurs, a type inspection must be conducted, and each type of wire-wound filter element must be finalized or transferred to another factory for production; 3
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After formal production, when the structure, process, raw materials are changed or production is resumed after a long-term shutdown; b.
When the results of the outgoing inspection are significantly different from the results of the previous type inspection; c
When the national quality supervision department makes a request, d.
7.3 Acceptance inspection
The acceptance inspection should be conducted within one month from the date of receipt. The user unit shall conduct the inspection according to the factory inspection or the items specified in the contract. If necessary, it can be conducted jointly by the supply and demand parties. 7.4 Sampling plan
Random sampling is adopted, and sampling inspection is conducted by batch. The inspection batch is determined by the manufacturer, and the production batch is generally used as the inspection batch. 7.5 Inspection items
See Table 2 for the inspection items.
Inspection Items
Appearance, Dimensions and Geometric Tolerances
Maximum Size Particles
Initial Precision
Contamination Capacity
Compressive Strength
Cleanliness
Compatibility
Inspected Products
All Products
Products of Each Material in Each Specification
Products of Each Material in a Certain Length
All Products
Products of Each Material in a Certain Length
Note: According to the 0.3% sampling plan, if the number of inspected products is less than 1,000, 3 pieces will be sampled. 7.6 Judgment Rules
7.6.1 Products that fail to meet the inspection requirements of appearance, dimensions and geometric tolerances are not allowed to leave the factory. 7.6.2 If any of the initial precision, maximum size particles and contamination capacity fails to meet the inspection requirements, it will be deemed as a defective product of the nominal accuracy level. 7.6.3 Flow
If the test fails to reach the standard value, it is a defective product. 7.6.4 Pressure resistance, compatibility
If one of the items fails to reach the standard, it is a defective product of the filter element of this material. Sampling inspection cycle
30 days~180 days
Replacement of materials
Sampling rate
7.6.5 Qualified batch determination
If there is one defective product after inspection, double sampling should be carried out for re-inspection. If the re-inspection is qualified, the whole batch is qualified; if there are still defective products after re-inspection, the whole batch is judged to be unqualified.
8 Marking, packaging, transportation and storage
8.1 Marking
8.1.1 Each filter element shall be marked with the trademark, product name, model, specification, material and manufacturer name in an appropriate manner. 4
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8.1.2 The outer packaging box should be marked with the delivery and receipt marks according to GB6388. 8.2 Packaging
8.2.1 Each filter element should be packaged in a transparent plastic bag. 8.2.2 The outer packaging should be a corrugated box with plastic film or kraft paper as the inner pad. 8.2.3 Each box should contain the product certificate, manual and other accompanying documents, and the box should be tied and sealed. 8.3 Transportation and storage
8.3.1 The filter element should be transported in a box or under a canopy, and should be protected from moisture during transportation. 8.3.2 The filter element should be stored in a dry and clean warehouse. Additional notes:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is managed by the Magnetic Recording Material Standardization Technical Management Unit of the Ministry of Chemical Industry. This standard was drafted by the Tenth Design Institute of the Ministry of Machinery and Electronics Industry, the 116th Factory of the Ministry of Aeronautics and Astronautics, and the Shanghai Xinjing Filtration Equipment Factory. The main drafter of this standard is Sui Yongyi.
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