This standard specifies the technical requirements, inspection, marking, packaging and storage of non-metallic flat gaskets for pipe flanges. This standard applies to non-metallic flat gaskets for pipe flanges specified in GB/T 9126. GB/T 9129-2003 Technical conditions for non-metallic flat gaskets for pipe flanges GB/T9129-2003 Standard download decompression password: www.bzxz.net

B/T9129--2003 is a revised version of GB912S1983 Technical Conditions for Gaskets. This standard is not equivalent to GB912S1983 for Micro-Cavity Gaskets for Steel Pipe Flanges. The main differences are as follows: GB912S1983 only recommends gasket materials and does not provide other technical conditions; while this standard specifies the materials, performance indicators and inspection requirements of gaskets. Compared with GB912S1983, this standard has the following main changes: ---- Expanded the scope of application;
Added material varieties!
Specified the performance index requirements for non-asbestos materials and other non-metallic materials (except convex cotton rubber materials). This standard is implemented at the beginning of the recommendation K/15129-1988 proposed by the China Machinery Industry Federation. The China Standardization Administration of China Standardization Commission for Pipe Accessories is responsible for this standard. The drafting units of this standard are: Mechanical Science Research Institute, Nanjing University of Technology, Taicang BMW Sealing Materials Co., Ltd., Zhangjiagang Haiguo Petrochemical Machinery Manufacturing Co., Ltd., Wuxi Benren Sealing Components Factory and Beijing Huami Chemical Pipe Fittings Co., Ltd. The main drafters of this standard are Gu Boxin, Milin, Ma Zhi, Shenglong, Zhang Linyue Zhijun, You Shangqiu, Li Junmei. This standard was first published in 2001: 1st revision 1 Scope
Non-metallic flat gaskets for pipe flanges
Technical conditions
This standard specifies the technical requirements, inspection, marking, packaging and storage of non-metallic flat gaskets for general flanges. This standard is used for non-metallic flat gaskets specified in (GD/T 9126). 2 Normative references
GD/T 9129—2003bZxz.net
The following industrial items have become the reference items of this standard through the date of reference. For all references with a date, all subsequent amendments (including changes) or chain revisions are not applicable to this standard. However, the parties who have reached an agreement based on this standard are encouraged to study whether the latest version of this document can be used: The referenced documents with a date of reference are the latest versions applicable to this standard, GB/T54) Test method for oil-bearing asbestos bite board GB/T511 Test method for stone screw rubber board
GB/T542 Test method for flexible rubber board with high strength Softness test method GB/3126 Non-metallic semi-gasket for flange
GH/12385191 Pipe flange sealing performance test method GH/T12621-1590 Flange gasket stress relaxation test method Flange gasket positive and negative test method GB/T126221990
3 Technical requirements
3.1 Materials
The materials of non-metallic semi-gasket are asbestos rubber, ethylene, non-fiber rubber. 3.2 Sex
3.2.1 Asbestos rubber The chemical composition and physical and mechanical properties of gaskets, asbestos rubber sheets and rubber sheets shall comply with the relevant material standards. The mechanical properties of non-asbestos fiber rubber sheets shall comply with the requirements of Table 1. 3.2.2 The test conditions and indicators of the shrinkage rate and elasticity rate of gaskets shall comply with the requirements of Table 2. 3.2.3 The test conditions and indicators of the gaskets shall comply with the requirements of Table 3. 3.2.4 The test conditions and indicators of the leakage rate of gaskets shall comply with the requirements of Table 4. Table 1 Physical and mechanical properties of non-asbestos fiber rubber sheets
axial load resistance: M||t t||Flexibility
Emperor seat/(/cu）
Oil resistance
Thick seat rate
Item quantity increase rate/%
No slow crack control
2. In the production and lack of white cotton sealing material, the leather should take measures to ensure that there will be no chain health problems. GB/T9129—2003
Base sheet type
Shenzhen light absorption sheet
Polyvinyl chloride reduction sheet
: City fiber difficult iron rubber sheet
Mold rubber cutting sheet
Heart cotton pregnant rubber seat!
Sanxin cotton fiber standard
Stone speed piece
Kangsidong 7 dry some
Non-stone fiber injection molding
Concentrated glue gasket
3. 2. 5 Test force method
Table 2 Test items and indicators of compression rate and elasticity rate of pieces
Minban sink/mm
Continue the city ratio industry M! n
Cat race/5
Table 3 Test conditions and indicators for stress relaxation rate of gasket
Sample or road/rrs
+5x$5X1.6
Current station, m
Test intensity/℃
Test conditions and indicators for gasket leakage rate
Test strip
Test medium pressure
Tightening ratio/MP:
Return rate/%
Bottom control salt and
Test upper small/MP
Non-asbestos rubber sheet material should be purchased! Pressure test according to GB/Gong541. The softness test of non-asbestos rubber sheet material shall be carried out according to T12. 3.2.5.3
Non-stone rubber gasket material density test shall be carried out according to 54. Non-stone rubber gasket material oil pressure increase test shall be carried out according to GH/T. 3.2.5.4
Non-stone rubber chip material quality increase test shall be carried out according to GH/T. 3.2.5.5
3.2. 5, 6
Sheet compression rate and rebound rate test shall be carried out according to GH/T12532-155C4 force method 3, sheet stress relaxation shall be carried out according to GH/T1262-1990 method B. 3.2.5.7
Sheet leakage rate test shall be carried out according to GH/T128-1030 method A. 3.3 Appearance
World density (m/)
*, 1. nx 1n *
51.0.x10-
3.3.1 The surface should be flat, without deformation, and no traces, wings, bubbles, foreign matter and other defects that may affect the correct use. The edges should be cut neatly.
3.3.2 Gaskets are generally allowed to be connected in a similar way. Liu does not need to be folded, and the points must be the same. 3.4 Limit difference in size
3.4.1 Half-face and flared flanges use some pieces The limit deviation of the size shall be in accordance with the provisions of Table 5. 3.4.2 The deviation of the size of the heat sink for the printed surface and the flange surface shall comply with the provisions of Table 6. Nominal diameter
Nominal force PN:
Table 5 Limit deviation of the size of the whole piece for the flat surface and the raised surface pipe cover
Inner diameter of the piece
Outer diameter of the piece
And the diameter of the piece,
+ center. Table 6 Limit deviations of dimensions of gaskets for flanges with concave and convex surfaces Gasket inner diameter Outer diameter GB/T9129—2003 Unit and variation Meter Centre diameter Unit: meter Length GB/T9129—2003 4 Inspection 4.1 Inspection type and inspection method Inspection items 4.1.1 Product inspection is divided into factory inspection and type inspection: 4.1.2 First inspection includes external quality inspection 4.1.3 Spring inspection includes the following: a) All inspections of the first inspection; b) The following performances; d) The sealing performance: 4.1.4 In the following cases, the type inspection shall be carried out: a) During normal production, the first inspection shall be carried out every six months; b) When the production is resumed, the quality supervision organization or the user proposes the type inspection requirement. 4.2 Inspection methods 4.2.1 External quality inspection of gaskets.
4.2.2 Dimensional deviation
Measure the size of the gasket with a standard ruler: the inner and outer diameters and thickness of the gasket are measured at each measurement, and the total value is taken (accurate to .2 m).
4.2.3 Test method for gasket compression elasticity, stress sensing performance and sealing performance 3.2.5.5.~3.35,% provisions, 4.3 Sampling and judgment rules
4.3.1 Gaskets of a certain material are batched with 10) pieces. Three pieces are randomly selected from each batch (less than 100 pieces are selected) and the size and external quality are inspected. If one piece does not meet the requirements of this standard, an additional number of pieces shall be selected for quick inspection and parallel inspection: If there is still one piece that does not meet the requirements of the standard, the batch of products shall be fully inspected with the light signature, and the products with random sampling shall be fully inspected: 4.3.2. The same material and the same nominal number of pieces are a pallet. One piece is selected according to the specifications specified in Table 2. If there is no required specification, it should be manufactured according to the same process and sufficient blood is tested for compression rebound performance, stress performance, and time performance. If any one piece does not meet the requirements of the standard, purchase additional pieces for preliminary inspection. If there is still one piece that does not meet the rating of this standard, the batch of products is unqualified or does not meet the type inspection. 5 Marking, packaging and storage
5.1 Marking
The whole piece can be marked with a cage or other force type, but the mark should always include the following: a) Flange cover code (R changes to FF according to the provisions of GR/1S125;) Nominal force number according to the mark:
c) Nominal force number according to the mark:
d Material name:
Gasket pressure;
() Manufacturer name or trademark.
GB/T 9129—2303
5.2 Unless otherwise specified by the user, the product should be packaged with materials, thickness, and specifications. The delivery must be accompanied by a product quality inspection certificate. The storage period of the film should be selected in accordance with the material requirements. The stored pieces should be placed in a dry warehouse with ventilation, avoiding direct sunlight, extrusion, exposure and normal heat sources.
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