tructural 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
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