Application scope of spirally-wound gasket:
Sealing of flange connection in pipelines, valves, pressure containers, condensers, heat exchangers, towers, manholes, handholes and so on in such industries as petroleum, chemical engineering, metallurgy, electricity, shipping and machinery.
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Structural material of metallic wrapping pad:
| Filling |
Steel band |
Inner ring |
Outer ring |
| Asbestos wrapping |
SUS 304 |
Carbon steel |
Carbon steel |
| Graphite wrapping |
SUS 316 |
SUS 304 |
SUS 304 |
| Teflon wrapping |
SUS 316L |
SUS 316 |
SUS 316 |
|
|
SUS 316L |
SUS 316L |
| Filling |
Temperature(ºC) |
Max operating pressure(kg/cm2) |
| Asbestos wrapping |
-200~550 |
250 |
| Graphite wrapping |
-150~450 |
100 |
| Teflon wrapping |
240~260 |
100 |
The following table lists metallic materials for inner ring and wrapping:
Product name |
AISI |
Hardness(HB/HV) |
Temperature(°C) |
| 304 Stainless steel |
304 |
130~180 |
-250~+550 |
| 316 Stainless steel |
316 |
130~180 |
-100~+550 |
| 316L Stainless steel |
316L |
130~190 |
-100~+550 |
Outer ring is often made from carbon steel subject to anti-corrosive treatment.
Flange type and form of wrapping pad:
Flange type |
Spiral wound gasket form |
| Flat face flange(F.F) |
Wrapping pad with outer ring only |
| Wrapping pad with inner and outer rings |
| Raised face flange(R.F) |
Wrapping pad with outer ring only |
| Wrapping pad with inner and outer rings |
| Male and female flange(M & F) |
Basic wrapping pad |
| Wrapping pad with inner ring only |
| Tongue and groove flange(T & F) |
Basic wrapping pad |
| Wrapping pad with inner ring only |
| Flat and groove flange(F & G) |
Basic wrapping pad |
| Wrapping pad with inner ring only |
Wrapping pad thickness tolerance:
Item |
Thickness(mm) |
Tolerances(mm) |
| Gasket thickness |
4.5, 3.2 |
+0.2
-0.1 |
| Ring thickness |
3.0 |
±0.24 |
Key technical parameter of metallic wrapping pad:
Wrapping pad coefficient |
m=2.5-4 |
| Wrapping pad service pressure |
≤25MPa |
| Wrapping pad service temperature |
-196ºC-700ºC(Oxidizing medium no higher than 600ºC) |
| Wrapping pad minimum pretension specific pressure |
y=68MPa |
The following table refers to tolerances for the diameter of wrapping pad (namely the nominal pipe diameters for the use of flange):
|
DIM(mm) |
ANSI B16.5
BS1560(mm)
Mss sp-44 |
API605 |
Tolerances |
Inner ring diameter
Pad 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 |
| Pad outer diameter |
<=600 |
<=24" |
<=24" |
±0.9 |
| >600 and <=160000 |
>24" and <=60" |
|
±1.8 |
| 1600 |
>60" |
|
±2.2 |
| Outer ring 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: We also tailor products based on JIS, JPI or customer requirement
Ordering information: The following parameters should be specified during ordering for metallic wrapping pad
Example:
1. Type of metallic wrapping pad: A B C D
2. Flange standard: ASME B16.20
3. Pipe through diameter, pressure rating: 2"150Lbs
4. Material: inner ring SS316; metallic wrapping belt SS316; packing belt: graphite; outer ring; carbon steel
Spiral Wound Gasket is the ideal gasket in the semi-metallic category. A narrow strip of V-shap metal hoop is spirally wound under tension with a filler cushion between the lami nation of the metal and is spot-welded at both ends.
This unique construction of a spring-like metal and soft filler provides gasket excel-lent characteristics.
Resistance to high temperature and high pressures.
Great resilience which allows the gasket to adjust automatically to change in operating conditions, such as pressure and thermal shocks, vibrations etc.
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