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 |
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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