Standard Spiral Wound Gasket

Standard Spiral Wound Gasket

Standard Spiral Wound Gasket are special semi-metallic gaskets of great resilience, therefore they are very suitable for applications featuring heavy operating conditions, Spiral wound gaskets are manufactured by spirally winding a V-shaped metal strip and a strip of non-metallic filler material.

Model:KXT-G1200

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Product Description

Standard Spiral Wound Gasket

Description:Spiral wound gaskets are special semi-metallic gaskets of great resilience, therefore they are very suitable for applications featuring heavy operating conditions, Spiral wound gaskets are manufactured by spirally winding a V-shaped metal strip and a strip of non-metallic filler material. The metal strip holds the filler, providing the gasket with mechanical resistance and resilience. Spiral wound gaskets can be reinforced by an outer centering ring and/or inner retaining ring. The outer centering ring controls the compression and holds the gasket centrally within the bolt circle. The inner retaining ring increases the axial rigidity and resilience of the gasket. Spiral wound gaskets should always be in contact with the flange and should not protrude into the pipe or project from the flange.

Application:Spiral wound gaskets can be used for sealing flange joints, manhole and handhold covers, tube covers, boilers, heat exchangers, pressure vessels, pumps, compressors and valves; in industries such as petrochemical, pharmaceutical, shipbuilding, and food processing, in power industries and nuclear power stations. They are ideal for steam, oil, liquids, gases, acids, alkalines, various organic mediums and solvents.

The Material:

1. Metal strap 
A. made of 08F,0Cr13, 0Cr18Ni19Ti, 0Cr18Ni9Ti, 00Cr18Ni10, 0Cr18Ni12Mo2Ti, 00Cr17Ni14Mo2 cold-rolled steel strap with a thickness of 0.15mm~0.25mm or decided by the supplier and acquirer. 
B. the metal strap should be pre-molding V-shaped or W-shaped narrow strap with smooth and clean surface, without any defects, such as roughness, cracks, scratches, drop pits or rusty spot, etc. 
C. Hardness value of the stainless steel HV≤200

2. Non-metal strap 
A. the non-metal packing material is specially-made asbestos strap, flexible graphite strap, PTFE strap, non-asbestos fiber strap and isinglass strap with a thickness of 0.3-1.0mm.
B. loss of weight on ignition of specially-made asbestos should be ≤25%.
C. chlorine ion content of non-metal strap should be ≤100PPM.
D. the recommended temperature and pressure of various medium and different metal straps.

Table1:

media    material

asbestos

graphite

non-asbestos

PTFE

Water-type media

600℃,CL 2500

550℃,CL 1500

350℃,CL 1500

-200-260℃, 
CL 1500

oil-type media

500℃,CL 1500

550℃,CL 600

350℃,CL 600

-200-260℃, 
CL 600

gas-type media

400℃,CL 600

550℃,CL 400

350℃,CL 400

200-260℃, 
CL 400

Note: used with non-oxygenization media, graphite can reach 800℃.


Table 2:

materials

temperature  ℃

maximum work pressure

applied media

compression ratio 
%

resilience ratio %

Stress relaxation force %

Expansion graphite

-220--550

250 BAR

corrosion media

18--30

≥17

≤18

specially-made asbestos strap

-200---600

 

 

18--30

≥19

≤28

PTFE

-200-- 250

100 BAR

corrosion media

18--30

≥15

≤13

Non-asbestos materials

-100--250

100 BAR

 general air sealing

18--30

≥19

≤28

isinglass

-150--800

100 BAR

special high temperature

18--30

3) Strengthening ring. Unless specially agreed, the internal strengthening material should be the same with that of metal strap, and the materials of external strengthening ring should be A3 steel and have received anticorrosive treatment.

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