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Name: Jiangsu Hengfeng New Material Co., Ltd.

Address: No.1 Shengli East Road, Huangqiao Economic Development Zone, Taixing City, Jiangsu Province

Contact: Yao Ning

Phone: 0523-87218316, 89791165

Fax: 0523-87220938

Mobile: 13584008800, 18952695778

Q Q: 2524225778 3212540193

Email: 13584008800@163.com

WeChat: 18952695778







Metal wound gasket with inner ring

点击量: 199 Release time: 2018-05-24 Traffic: 199
Metal wound gasket with inner ring
product description

The inner ring is generally made of the same material as the wound steel strip. It meets the requirements of pipeline medium corrosion resistance and is usually better than the material of the pipe or flange. According to the standard requirements, the metal winding tape is first fixed on the inner ring and then the metal winding tape is used with graphite, asbestos, poly Non-metallic winding tapes such as tetrafluoroethylene and non-asbestos are continuously alternately overlapped and spirally wound. The metal tape is fixed at the end by spot welding. The inner ring is also called a stiffening ring to avoid loose circles around the gasket.

Performance characteristics: The metal wound gasket with inner ring uses the control of the inner ring to obtain the maximum compression of the gasket, and the surface accuracy of the flange sealing surface that the wound gasket contacts 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. Generally used in low and medium pressure tongue and groove surface and flat or concave surface flange

Equipment: Petroleum, chemical, metallurgy, power, shipbuilding, machinery and other industries of pipelines, valves, pressure vessels, condensers, heat exchangers, towers, manholes, hand holes and other flanged joints are sealed.

Winding gasket structure and code and flange type:

Basic type Code Applicable flange sealing surface Thickness (mm)
V-shaped basic body / ring W-shaped basic body / ring
Basic type A or R type Tongue and groove surface, concave and convex surface, flat surface and groove surface 3.2; 4.5 4.8; 5.5; 7.5
With inner ring B or RIR Tongue and groove surface, concave and convex surface, flat surface and groove surface 3.2 / 24.5 / 3 4.8 / 3.05.5 / 4.07.5 / 5.0
With positioning ring C or CG type Flat or convex
With inner ring and positioning ring D or CGI type Flat or convex

material:

1.Metal tape with inner ring metal winding gasket

A. Cold rolled steel strips such as sus304, sus316L, and sus321 with a thickness of 0.15mm ~ 0.25mm, or determined by the supplier and the buyer through consultation.

B. The metal strip is a pre-formed V-shaped or W-shaped narrow strip. The surface should be smooth. Clean and free from defects such as roughness, cracks, scratches, pits and rust spots.

C. The hardness value of stainless steel HV≤200

2. Non-metallic tape with inner ring metal wound gasket

A Non-metal filling is made of special asbestos tape, flexible graphite tape, polytetrafluoroethylene tape, non-asbestos fiber tape, and mica tape. The thickness of the belt is 0.3-1.0 mm.

B. Loss on ignition of special asbestos must be ≤25%

C. Chloride ion content of non-metallic belt ≤100PPM

D. Recommended temperature and pressure for various media and various non-metallic belts

Main technical parameters of various non-metallic materials for wound gaskets:

material Identification code Temperature Working pressure Applicable medium Compression ratio% Rebound rate% Stress relaxation rate%
Expanded graphite FG -220--550 250 BAR Corrosive media 18--30 ≥17 ≤18
Special asbestos tape ASB -150--450 100 BAR Airtight 18--30 ≥19 ≤28
Teflon PTFE -200-- 250 100 BAR Corrosive media 18--30 ≥15 ≤13
Asbestos-free material NAF -100--350 100 BAR General air tightness 18--30 ≥19 ≤28
Mica MICA -150--800 100 BAR Extra high temperature 18--30 ≥19
Pottery CER -200--1090 100 BAR Ultra high temperature 18--40 ≥19

The following table is used to select the material of the inner ring and the wound metal belt:

Material name Abbreviation mark Hardness (HB) Temperature (° C)
SUS 304 304 130 ~ 180 -195 ~ + 550
SUS 316L 316L 130 ~ 180 -100 ~ + 550
SUS 321 321 130 ~ 190 -195 ~ + 760
HASTELLOR-B2 HASTB 215 -185 ~ + 1090
INCONEL-600 INC600 150 -100 ~ + 1090
MONEL-400 MON 150 -130 ~ + 820
titanium T2 215 -195 ~ + 1090

Basic thickness tolerance of metal wound gasket:

project Thickness (mm) Tolerance (mm)
Gasket thickness 4.5, 3.2 + 0.2-0.1
Ring thickness 3.0 ± 0.25

The following table is the diameter tolerance of the wound gasket (that is, the nominal pipe diameter for the flange):


DIN (mm) ANSI B16.5 BS1560 (mm) Mss sp-44 API 605 tolerance
Inner ring 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 <= 16000 > 24 "and <= 60" > 24 "and <= 60" ± 1.8
1600 > 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

Main performance parameters of metal graphite wound gasket :

Winding gasket factor m = 2.5-4
Winding gasket using pressure ≤25MPa
Winding gasket use temperature -196 ℃ -700 ℃ (not higher than 600 ℃ in oxidizing medium)
Minimum pre-stressed specific pressure of wound gasket y = 68MPa

technical standard:

1. The foreign manufacturing standards for metal wound gaskets are: ASME B 16.20, ASME B 16.5, ASME B 16.47 A (B), BS EN1092, JIS, and NF, etc.

2. Domestic standards are

HG20610-2009 Spiral gasket for steel pipe flange European system of Ministry of Chemical Industry

HG20631-2009 Wound Gaskets for Steel Pipe Flange

GB / T4622.2-97 National Standard for Gasket Dimensions for Wound Gasket Pipe Flange

JB / T4719-92 Standard for Mechanical Parts of Spiral Gaskets for Shell and Tube Heat Exchangers

JB / T90-94 Standard for spiral flange gaskets for pipeline flanges

JB / T4705-2000 Standards for mechanical parts of pressure vessel flange wound gaskets, etc. For more standards or requirements, please contact us.




Website URL: http://qch777.com ( copy link ) Jiangsu Hengfeng New Material Co., Ltd. ICP record number: 苏 ICP 备 14001347 号 -1