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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







Graphite wound gasket

点击量: 1863 Release time: 2018-05-24 Traffic: 1863
Graphite wound gasket
product description

At present, the most widely used graphite wound gasket is a gasket with the best resilience among semi-metallic gaskets. It is formed by alternately winding a V-shaped or W-shaped thin steel strip with various fillers. By changing the material combination of the gasket, the problem of chemical corrosion of the gasket by various media can be solved. In order to strengthen the main body and accurate positioning, the metal inner reinforcement ring and outer positioning ring are used. The inner and outer rings are used to control the maximum compression degree to strengthen the function and avoid the loosening of the basic body. The gasket is installed due to the existence of the outer ring More convenient, generally used in low and medium pressure flat and convex flanges

Performance characteristics of graphite wound gasket: it can withstand high temperature, high pressure, and adapt to the conditions of ultra-low temperature or vacuum. The surface accuracy of the flange sealing surface contacted by the gasket is not high, and it is easy to disassemble.

Winding pads used 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 belt with inner and outer ring winding pad

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-metal band with inner and outer ring winding pad

A. Non-metal filled with special asbestos tape, flexible graphite tape, PTFE 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 graphite wound gasket:

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

Graphite wound gasket basic body thickness tolerance:

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 graphite wound gaskets (that is, the nominal pipe diameter for flanges):


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

The main performance parameters of 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 graphite 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