Flange Gasket, Asme B16.20 Spiral Wound Gasket, Ring Joint Gaskets

Product Description

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.