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Home > Products > Spiral Wound Gasket > Asme/ANSI B16.20 Metal Spiral Wound Gaskets, Flange Gaskets, Valve Gaskets

Asme/ANSI B16.20 Metal Spiral Wound Gaskets, Flange Gaskets, Valve Gaskets

Basic Info

Model No.:  ASME/ANSI B16.20 metal spiral wound gaskets

Product Description

Model NO.: ASME/ANSI B16.20 metal spiral wound gaskets Application: Flanges, Valaves Performance: Corrosion Trademark: C&N Material: Metal Rubber Type: Oil Seal Standard: Standard, Nonstandard Origin: China
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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