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.
The main style of spiral wound gasket：
 |
Spiral Wound Gasket Without Inner and Outer Ring（R
Style） |
Spiral Wound Gasket With Inner Ring（RIR Style） |
Spiral Wound Gasket With Outer Ring（CG Style） |
Spiral Wound Gasket With Inner & Outer Ring（CGI
Style） |
The material & configuration of spiral wound
gasket：
Winding Hoop &Inner Or Outer Ring |
Filler |
|
|
Code |
Material |
Code |
Temperature(℃) |
V
Shape/Ring
|
Carbon Steel |
CS |
Asbestos |
|
500 |
3.2/2.0
4.5/3.0 |
4.8/3.0
5.5/4.0
7.5/5.0 |
Stainless Steel |
304(L)、316(L) |
Graphite |
FG |
650 |
Monnel |
Mon |
PTFE |
PTFE |
250 |
Nickel，Titanium |
Ni,Ti |
Mica |
MICA |
950 |
Inconnel |
INC |
Ceramic |
CER |
1000 |
Hastelly c276，zirconium |
HAST,ZIRC |
Non-asbestos |
NAF |
300 |
Main Specification：
Filler |
Temperature |
Pressure |
Graphite |
-200℃~+550℃ |
250MPa |
Asbestos |
-150℃~+450℃ |
100MPa |
PTFE |
-200℃~+260℃ |
100MPa |
The style of flange and suitable spiral wound
gasket style ：
|
Flange |
Suitable Shape of Gasket |
FF Flange |
CG |
CGI |
RF Flange |
CG |
CGI |
FM Flange |
R |
RIR |
G Flange |
R |
RIR |
T Flange |
R |
RIR |
Terence of spiral wound gasket：
| |
DIN (mm) |
ANSI B16.5
BS1560 (mm)
Mss sp-44 |
API 605 |
Terence(mm) |
Inner Diameter of Inner Ring/Inner
Diameter of
Gasket |
<=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 |
Outer Diameter of Gasket |
<=600 |
<=24" |
<=24" |
±0.9 |
>600 and <=160000 |
>24" and <=60" |
>24" and <=60" |
±1.8 |
1600 |
>60" |
|
±2.2 |
Diameter of
Outer Ring |
|
|
>=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 |
We can
also produce as standard of JIS,JPI or as request.
How to Order:
R |
ZD-G1200A |
RIR |
ZD-G1200B |
CG |
ZD-G1200C |
CGI |
ZD-G1200D |
