Some standard content:
National Standard of the People's Republic of China
Technical Conditions
Specification of spiral wound gaskets 1 Content and Scope of Application
The standard specifies the technical conditions, test methods and inspection rules for spiral wound gaskets. This standard is applicable to spiral wound gaskets for pipe flanges and pressure vessel flanges (hereinafter referred to as gaskets) 2 Reference Standards
GB541 Test Method for Tensile Strength of Asbestos Rubber Sheets GL9J2 Hot-rolled Thin Plates and Strips of Carbon Steel and Low-alloy Structural Steel (3280 Cold-rolled Stainless Steel
GB3986 Test Method for Loss on Ignition of Asbestos Rubber Sheets G134239 Cold-rolled Stainless Steel
Vickers Hardness Test Method (13 6905. 3
Boiler water analysis method Determination of chloride Mercury method
G13/T1418 Test method for continuous wound gasket
3 Materials
3.1 Metal strip
GB 4622.3-93
3.1.1 Metal strip material is 03F, 0Cr13, 0Cr18Ni9Ti1Cr18Ni9Ti, 00Cr18Ni10oCr18Vi12Mu2Ti.3C17Ni14Mo2 cold rolled steel strip with a thickness of 0.15~0.25mm, or determined by negotiation between the supply and demand parties. 3.1.2 The surface of the metal strip should be smooth and clean, and no roughness, cracks, scratches, concave flow and spots are allowed 3.1.3 In addition to the material agreed upon by the supply and demand parties and the hardness requirements specified by the industry, the hardness of the stainless steel strip shall be tested according to GB4340, and its hardness value IV shall not exceed 200.
3.2 Non-metallic strip
3.2.7 Non-metallic filling materials are specially made ingots, flexible quartz strips and polytetrafluoroethylene strips, or determined by the supply and demand parties. The thickness of the non-metallic strip is 0.3~1.0mm, and its chemical composition and physical mechanical properties shall comply with relevant standards or regulations. Standard provisions, the recommended humidity range circle must be installed"
Filling belt material
Special asbestos
Responsible in the leg
Polyethylene
State Technical Supervision Bureau 1993-02-19 approved also use culvert, C
(non-hydrogen compensating medium ≤800)
200-26
199310-01 implementation
GP4622.393
3.2 .2 The ignition loss of special right cotton shall be tested according to CB3986, and its ignition loss shall not exceed 25%. 3.2.3 The chloride content of the non-metallic belt of the insulated grid used for stainless steel flange connection shall be tested according to GB6905.3 and shall be less than 100ppm, or determined by negotiation between the supply and demand parties.
3.3 Reinforcement ring
Unless otherwise agreed by the supply and demand parties, the material of the inner reinforcement ring shall be the same as that of the metal strip; the material of the outer ring shall be A3 steel and shall be rust-proofed.
Working requirements
The main body of the smear should be "V\" plastic metal belt and non-metal belt are intertwined and wound together, and the metal belt and non-metal belt should be closely attached to each other without wrinkles, voids, etc.bzxZ.net
4.2 The entire body should have 2 to 4 metal belts at the beginning and end. Non-metal belts are not filled in. The number of voids of gaskets with a nominal diameter of more than 1500mm can be increased accordingly. Gaskets with external reinforcement: The metal belt should be wound 2-! circles after the end of the body. It is used to adjust the gap and positioning when assembling the outer ring. The outer diameter of the gasket is not included in the circle. 4. 3 The number of points inside and outside the gasket body should be consistent with the table; the number of points at the beginning and end should not be more than 3 points, and the distance between welding points should not be less than 1C15 tnrt
Nominal diameter W.IE
109--38
350--F00
Number of welding points
4.4 The inner and outer reinforcements can be stamped and machined from the whole material, assembled and welded, and the ring surface should be flat, and the flatness tolerance should be less than 1%. The ring groove should be concentric with the inner and outer circles and symmetrical with the two end surfaces. 4.5 The gasket with inner reinforcement can be connected to the outer circle of the inner ring. Winding: Special machines can also be used to tightly fix the inner ring and the seal body. 4.6 There should be an appropriate assembly gap between the reinforcing ring and the gasket body. 4.7
After the main body is assembled: its sealing rain is not allowed to be machine-broken or pressed alone. Deviation
The limit deviation of the gasket body and the positioning size should comply with the provisions of Table 3 and Table 4.3
Nominal diameter
255-00
650～1 200
j300~-3 o0
whole piece certificate
inside and outside drive ring
2. 2-3. 2
6 appearance quality
piece body
G road 4622.3
limit deviation
-+- 1, -
6.1 gasket body installation without the scars, voids, uneven rust spots and other defects that affect the density. Extreme deviation
6.2 the whole piece of main body of the love painting non-concept band should be evenly-appropriately developed, the interlayer texture should be clear, but the metal explosion band can be revealed, 6.3 coal point should be on the metal belt "V\ symmetrical cross section of the point distance should be uniform, there should be no unfused and plate melting and other pits. 6.4: The gasket body should be large and free of burrs, unevenness, rust spots, etc. The distance between the upper and lower sealing surfaces of the gasket body and the upper and lower surfaces of the reinforcing ring should be equal. The inner reinforcing ring and the gasket body should be tightly fixed and not loose. The outer ring and the gasket body should still maintain their position and move properly.
7 Performance
7.1 The test conditions and indicators of the compression and elastic properties of the gasket should meet the current requirements of the equipment:
| The main position of the gasket
| The special name of the new belt
| The back of the belt
| The back of the belt
| The test specifications
| The inner parts of the belt
| The compression stress
MPa(bar)
70. 0±1. 0
（700±10)
loading and unloading intensity
MPa/(bat/s)
u.srs. 6)
7.2 The test conditions and indicators of gasket stress relaxation performance shall comply with the provisions of Table 6, Table 6
whole body
gold exhibition belt ten-line system
design specification
tea belt + parent-made DN32am
gold lean·ban melon
about
preload stress, MPaibar)
1700-+-103
test parts
test temperature,
7.3 The test conditions and indicators of gasket nitrogen seal injection performance shall comply with Table 7. Compression rate, depth
Reduction time, h
Elasticity,
Stress relaxation rate, Xian
Specimen specification
With inner and outer rings
Test temperature
Test bar
Compact stress
Test medium
MPa(Lar)
（700±10)
GB 4622. 3-*-93
Test pressure
MPa(bar)
Nominal pressure
Allowable end gasket.cm/g
1.2x102.0x10
The test conditions and indicators of the water-tight sealing performance of the whole piece shall comply with the provisions of Table 8. Table 8
Test conditions
Test specifications
Yw80mm
With inner and outer rings
Test pressure, C
Test quality
Vertical stress
MPa(har)
75.0±1.0
(700±10)
MPa(uar)
1.3 times of nominal force
7.5 The test conditions and indicators of the performance of the heat sink steam seal shall comply with the provisions of Table 9. Table 9
Test conditions
Test specimen size
DNgomm
With inner and outer rings
Test pressure, C
30*【Public
Specification
-F I. MPa
60-\ (when
nominal limit force is greater
F 1. C MPa
Test medium
water vapor
compression stress
MPa(bar)
(700110)
Note: The test temperature of the test gasket with the filling tape of polytetrafluoroethylene winding is 200℃. 8 Inspection method
8.1 Appearance quality
Appearance quality of the gasket is inspected by the method of medium measurement.
8.2 Dimensional deviation
Gasket size is measured with a vernier caliper,
Test pressure
MPathar)
1.1 times of the nominal pressure
s1.oxlos.oxho.
Pressure holding time
Pressure test
The outer edge of the gasket is water-free within the pressure holding time, no detachment and obvious
allowable leakage rate, g/
1.0×10\*
8.2.1 The measurement of the inner and outer diameters of the gasket body should avoid the welding points, and measure three places respectively, and take the arithmetic average (accurate to 0.2mm). 8.2.2 The measurement of the inner and outer diameters of the reinforcing ring should be taken at three places respectively, and take the arithmetic average (accurate to 0.2mm). 8.2.3 The thickness of the gasket body should be measured at any three locations, and the arithmetic mean value should be taken (accurate to 0.1mm). 8.3 Performance
8.3.1 The test method for gasket compression and elastic properties shall be in accordance with Appendix A. 8.3.2 The test method for gasket stress relaxation performance shall be in accordance with Appendix B.16
GB4622.3—93
8.3.3 The test method for gasket nitrogen sealing performance shall be in accordance with Appendix A. 8.3.4 The test method for gasket water pressure sealing performance shall be in accordance with GB/T14180. 8.3.5 The test method for gasket steam tightness performance shall be in accordance with GB/T14180. 9 Inspection rules
9.1 Inspection classification and inspection items
9.1.1 Product inspection is divided into factory inspection and type inspection. 9.1.2 Factory inspection items include size, appearance quality, water pressure sealing performance test or steam tightness performance test when required.
Plastic inspection includes the following items:
All items of factory inspection;
Compression and rebound performance of gasket;
Stress relaxation performance of gasket;
Nitrogen sealing performance of gasket.
When there is one of the following conditions, the gasket should be subjected to type inspection: new products or old products transferred to the factory for trial production and identification; b.
After injection production, if there are major changes in gasket structure, materials, and processes, which may affect product performance: in normal production, it should be inspected once every six months; after three months of suspension, when production is resumed;
When there is a big difference between the factory inspection result and the last type test: when the national quality supervision agency or the user proposes a type inspection requirement. f
9.2 According to the cooperation between the supply and demand parties, the steam air sealing performance test can be added. When the national quality supervision agency arbitrates, the nitrogen sealing performance test and steam sealing performance test must be carried out at the same time: 9.3 Sampling and determination rules
9.3.1 The same structural type and the same material combination of thermal pads are 100 pieces as a batch, and 5 pieces (3 pieces if less than 100 pieces) are randomly selected from each batch to inspect the size and appearance quality. If there is one piece that does not meet the requirements of this standard, double the number of gaskets shall be taken for re-inspection. If there is still one piece that does not meet the requirements of this standard, the whole batch of products shall be inspected. Products with less than the required number shall be inspected. 9.3.2 Gaskets of the same material combination and the same nominal pressure level shall also be taken as a batch of 100 pieces. According to the gasket specifications and types specified in Tables 5 to 10, 3 pieces shall be taken. If there is no sample specification, a sufficient number of test pieces shall be manufactured according to the same process for shrinkage, rebound performance, stress relaxation performance, nitrogen sealing performance, water pressure sealing performance, and steam tightness performance tests. If there is one piece that does not meet the requirements of this standard, double the number of gaskets shall be taken for re-inspection. If there is still one piece that does not meet the requirements of this standard, the whole batch of products shall be deemed unqualified. 10 Marking, packaging, and storage
10.1 The marking of the product shall include the following:
a. Product marking:
Manufacturer’s name or trademark;
c. Production date or batch number.
10.2 The packaging method of the gasket shall be determined by the manufacturer, but the whole piece after packing must be protected from moisture and positioned. The packing box shall contain the product certificate signed by the inspector and the packing list signed by the custodian. The packing list shall indicate the gasket mark, quantity and packing date. 10.3 During the storage period, the potential piece should be placed in a warehouse with normal ventilation and dryness, and should be protected from sunlight and away from heat sources. 17
A1 Test device
GE 4622.393
Appendix A
Test method for compression, rebound and sealing performance of wound whole piece (supplement)
The test device consists of a potential piece loading system, a medium setting system, a leak detection system, a frame and a test flange, as shown in Figure A1. Calibration gas source
Test quality
Figure A1 Test device
1 Standard gasket, 2 Test air control; 3--Flange--gasket--flow and float; Displacement sensor Pressure sensor--intensity sensor Flow sensor 10--micro 5 sensor
Pressure wave
The gasket wearing system should be able to provide the specified gasket preload stress. The fluctuation of gasket load during the test should be less than 1% of the specified value: A1.1
And it can control the specified compartment and load tolerance.41.2 Test medium The given system should be able to provide the specified test medium pressure. The pressure fluctuation during the test should be less than 1% of the specified value.
A1-3 The state equation method is used for leak detection. A closed annular leak detection cavity is set on the outer side of the gasket and the upper and lower flange surfaces. The initial volume of the leak detection cavity is V. The volume change correction coefficient K should be strictly calibrated, the resolution of the leak detection system should not be less than 10-\cm, and the system error should not be larger than T0. $
41.4 The test flange adopts a rigid azole plane to simulate the flange. The ratio of flange thickness to diameter should not be less than 1/3: the ultimate hardness 0 of the flange material should not be less than 500.MI: the hardness of the braid cover should not be less than HR40, and the precision R should be between 5-~10um (when -V4) A2 Gasket compression and rebound test
A2.1 Test details
The test partner selects a piece and drys it at a constant temperature in a hot air oven at 100+2C for 1h, and then covers it in a honey temperature dryer for standby use. 18
A2.2 Test conditions
Test temperature: 15~25℃
Initial gasket load: 1MPa (:bar)
Pressure: 70MPa (700 bar) GB 4622. 3
Loading and loading speed: 0.5MPa/s (5br/s) A2.3 Test
A2.3.1 Clean the flange seal with acetone and install the gasket. 93
A2.3.2 Apply initial load to the gasket to the specified value and measure the initial thickness T of the gasket. Zero the displacement sensor A2.3.3 Apply the tightening stress to the whole piece at the specified loading speed to the current set value, record the shrinkage LDG of the gasket and unload at the specified speed. When the initial load is compensated, record the residual compression X of the gasket. A2.4 Calculate the results
A2.4.1 Calculate the positive shrinkage X (%) and the rebound rate (%) of the strip according to A1) and formula (A2): X
Xi De -- De.
Wu: The initial original size of the strip m
The original size of the strip mn
The residual shrinkage of the strip, mm.
A2.4.2 Take the smallest effective point of the calculated results. 43 Sealing performance test of thermal sheet
A3.1 Test preparation
After washing, the test piece is dried in a hot air box at 1002℃ for 1h and placed in a room temperature balance oven for use. A3.2 Test conditions
Test temperature: 15~35℃
Pre-tightening stress of the sheet: 7MPa (700bur) Test medium: 99.9% 1% chlorine gas
Test medium pressure: 1.1% of the nominal pressure of the sheet. A3.3 Test steps
A3.3.1 Cleaning method with ketone group, hold the sealing surface of the thermal sheet tightly, A3.3.2 Apply tightening stress to the sheet. If the tightening stress reaches the set value, keep it for 15mi. 43.3.3 Calibrate the initial volume and penetration change correction coefficient of the leak detection cavity. A3.3.3.7 Calibration of the initial volumetric formula (A3) for leak detection air control: Vr
Initial volume of leak detection air, cm\:
r—Volume of standard solution, cn
P----Pressure of standard solution, Pa:
GB 4622.3-93
P—Pressure in the test cavity, Pa:
--Balanced positive force between the container and the leak test cavity, PaA3.3.3.2 Volume change correction coefficient (A4): K=MP+P-+T
--
-…Volume change correction coefficient, cml/mm:
Calibration test heat plate pressure increase during calibration
Calibration test cavity pressure increase during calibration, Pa: Calibration end pressure difference between the test cavity pressure and the ambient atmospheric pressure, Pa: Ambient atmospheric pressure, Pa
.-Increase in the test cavity hysteresis during calibration, K: Standard is the temperature difference between the test cavity temperature and the ambient atmospheric pressure at the end of calibration; Ambient atmospheric temperature,K.
Pass the test medium, keep the medium pressure value A
record the pressure P, temperature T, and the whole pressure D in the leak cavity and start recording. After 2m5, record the pressure P, temperature T and the whole shrinkage D in the leak detection cavity. The result is calculated by the formula (AS):
; Lk
European leakage rate, cm/s:
K·ADG
The atmospheric pressure under standard conditions is! 01325×10° standard inverse state, the pressure difference between the end of the leak test cavity and the ambient pressure (P-,), a; the change in the temperature of the leak test cavity during the leak test (P): the difference between the temperature of the leak test cavity and the ambient temperature (T-T) K: the attenuation increase of the temperature of the leak test cavity during the test, K: the maximum change of the compression of the control piece during the leak test (De2-D,), mm test time-1208.
A3.4.? The calculation result is rounded to two decimal places, 20
Route 1 Test device
Record
Stress relaxation test method for wound gasket
(Supplement)
The test device consists of a test unit, a load measurement system and a flow control system. The island 11 test bench is composed of virtual bolts, test flanges, distance blocks, iron nuts, etc. As shown in 31, the 1-2 load measurement system is composed of an arm at the strain screw control point, the lower points at both ends, an adjusting screw and a central pre-rod connected to it. 1.3 Temperature control system Electric heater, thermoelectric bias and temperature control group, 1.4 Strain bolt material is 35 (rMnA opened after quenching and tempering 1.5 Strain bolt light load cycle - deformation characteristics at 20 ℃ and test temperature should be strictly calibrated: and converted into a stress relaxation calculation diagram with the gasket stress micrometer reading as the base, as shown in Figure B2, Figure B1 Test bench
1~3 minute gauge 2 Locking luxury micrometer frame 4 Loading slow nut 5 Non-force: Shadow auxiliary project 8 Strain light test flange (upper) Test gasket test flange (lower) Fastening gap support 14 Section screw [5 Thermoelectric false hole; 16 Deep fierce sleeve:! Pin--8 Concentrated training:! Heating wire (12 Insulation cover; 2 Pet distance block
G 4622.3--93
-Specimen pressure relief relaxation calculation chart
The control accuracy of the control system should be within ±! 2. Test preparation
After the sample is selected, place it in a hot air oven and dry it at room temperature for 1 hour, then place it in a room temperature dryer for standby use. B3 Test steps
Place the test hot plate sensor card up and down and close it on one side. Through the joint screw at the bottom of the strain bolt, tighten the loading screw with a force bar, and press the sample to return it to the specified stress. If the stress drops after 5 minutes, tighten it to the initial value again and record the value of the test table. A14 3.3
Turn on the electric heater, heat it to the test temperature in 1 hour, and adjust the mouse controller so that the temperature fluctuation is less than 1.5%. Keep the test temperature for 16 h, record the table reading B3.5 Under the test temperature, load the bolt and record the reading A of the unloaded piece: 584
Test equipment processing
4.1 From the reading A and (Az--A) value, the residual preload stress S of the potential piece and the residual stress Sk of the gasket are obtained from the corresponding load-deformation line at 20C and test temperature in Figure B2. 4.2 The stress relaxation rate of the grab piece (%) is calculated according to the formula ((31): YS=x × IGG
Wu City: Sk
Pre-tightening stress of gasket, Pa?
Residual stress of gasket, Pa.
B4.3Calculation results are rounded to the decimal point
Added period
This standard is proposed by the State Bureau of Building Materials Industry. GE4622.3--93
This international standard is jointly developed by Beijing Institute of Chemical Technology, Yantai Asbestos Products General Factory, Machinery and Electronics Industry Ministry's Machinery Standardization Research Institute and China Oil and Chemical Corporation Beijing Youhua Shangcheng Company. The main drafters of this standard are Zhang Shengdian Bobo, Zhang Jianguo, Li Xinhua, Zhang Suoying Geliang17bzW.cnCrisp Bear Brown He Iron Driving Ge Yanhen Zhang Ke5
17izw.comCrisp Lufeng
Jiangzhong Cricket Frame E Fa
1Le Ying 60 Wing
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