Analysis of metal wound gasket
The main purpose
Metal wound gasket with excellent resilience can carry out pressure thermal cycle and vibration of pipeline system
Automatic adjustment, especially suitable for occasions where the load is uneven, the bonding force is easy to relax, the temperature and pressure are periodically changed, and there are shocks or vibrations. It is a statically sealed original at the flange connection of valves, pumps, heat exchangers, towers, manholes, hand holes, etc. It is widely used in petrochemical, machinery, power, metallurgy, shipbuilding, medicine, atomic energy and aerospace sectors.
In order to facilitate the installation of the appearance of the flange gasket, according to the size of the gasket, weld 2 to 8 positioning bands on the periphery of the gasket to allow the positioning band to buckle on the flange hole to prevent the gasket from shifting or falling off during installation Saves auxiliary materials and man-hours. Generally divided into the following types:
Metal winding gaskets are made of high-quality SUS304, SUS316 ("V" or "W") metal belts and other alloy materials, and alternately spirally wound with graphite, asbestos, polytetrafluoroethylene gaskets, asbestos-free soft materials, At the beginning and end, the metal band is fixed by spot welding. The metal wound gasket is the best resilience gasket in the semi-metal tight gasket. The structure density of the metal wound gasket can be made according to different locking force requirements, and the inner and outer steel rings are used to control its maximum compression degree. The surface accuracy of the flange sealing surface contacted by the gasket is not high. Metal wound gaskets are particularly suitable for occasions where the load is uneven, the bonding force is easy to relax, the temperature and pressure are periodically changed, and there are shocks or vibrations. Spiral gaskets are the statically sealed originals for flange connection processing of valves, pumps, heat exchangers, towers, manholes and hand holes.
Application range of wound gasket:
It is used to seal flange connections of pipelines, valves, pressure vessels, condensers, heat exchangers, towers, manholes, and hand holes in the petroleum, chemical, metallurgy, power, shipbuilding, and machinery industries.
Types of metal wound gaskets:
Section Section Form Code Thickness Basic Wound Gasket A3.24.5 Wound Gasket with Inner Ring B 4.5 Wound Gasket with Outer Ring C 4.5 Wound Gasket with Inner and Outer Ring D 4.5
Structural material of metal wound gasket:
Filler steel belt inner ring outer ring
Asbestos winding SUS 304 carbon steel carbon steel
Graphite winding SUS 316SUS 304SUS 304
PTFE winding SUS 316LSUS 316SUS 316
SUS 316LSUS 316L
Filling material temperature (° C) maximum operating pressure (kg / cm2)
Graphite winding-200 ~ 550250
Asbestos twine -150 ~ 450100
PTFE winding 240 ~ 260100
The following table is used to select the material of the inner ring and the wound metal:
Product name AISI Hardness (HB / HV) Temperature (° C)
Stainless steel 304 304 130 ~ 180-250 ~ + 550
Stainless steel 316 316 130 ~ 180-100 ~ + 550
Stainless steel 316L316L130 ~ 190-100 ~ + 550
The outer ring is usually made of carbon steel with anti-corrosion treatment.
Flange type and winding gasket form:
Flange type Wound gasket shape Flat flange only with outer ring wound gasket with inner and outer ring wound gasket convex flange only with outer ring wound gasket with inner and outer ring wound gasket Bump flange Basic type wound gasket with inner only Ring wound gasket groove flange basic wound gasket only with inner ring wound gasket flat and groove flange basic wound gasket with inner ring wound gasket only wound thickness tolerance
Project thickness (mm) Tolerance (mm) Gasket thickness 4.5, 3.2 + 0.2
-0.1 ring thickness 3.0 ± 0.24 metal winding gasket main technical parameters:
Coiled gasket coefficient m = 2.5-4 Coiled gasket use pressure≤25MPa Coiled gasket use temperature-196 ℃ -700 ℃ (not higher than 600 ℃ in oxidizing medium) Minimum pre-tightening pressure of coiled gasket y = 68MPa The table is the diameter tolerance of the wound gasket (i.e. the nominal pipe diameter for the flange)
DIM (mm) ANSI B16.5BS1560 (mm) Mss sp-44API605 tolerance inner ring inner diameter gasket inner diameter <= 600 <= 24 "> = 26" and <= 34 "± 0.5> 600 and <= 800> 24" and <= 34> = 36 "and <= 60" ± 0.9> 800 and <= 1600> 34 "and <= 60" ± 1.3> 1600> 60 "± 1.6 gasket outer diameter <= 600 <= 24" <= 24 "± 0.9> 600 and <= 160000> 24" and <= 60 "± 1.81600> 60" ± 2.2 outer ring outer diameter> 1/2 "and <= 60" ± 0.9 <= 600 <= 24 "0- 1.0> 600 and <= 1000> 24 "and <= 34" 0-1.8> 1000 and <= 1600> 34 "and <= 60" 0-2.2 Note: In addition, we can also according to JIS, JPI standards or customer requirements produce
Ordering instructions: The following parameters should be noted when ordering metal winding pads, examples:
1. Type of metal winding pad: ABCD
2. Flange standard: ASME B16.20
3. Pipe diameter and pressure level: 2 "150Lbs
4. Material type: inner ring SS316; metal winding tape SS316; filler tape: graphite; outer ring: carbon steel
※ The actual application conditions are different. The above parameters are for reference only and do not make any guarantee requirements.