Spiral Wound Gasket

Spiral Wound Gasket




Utilises an external ring which accurately centres gasket on flange face; provides additional radial

strength to prevent gasket blowout and acts as a compression stop. A general purpose gasket suitable

for use with flat face and raised face flanges. Where space is limited it may be possible to provide a

spiral wound outer ring for proper centering; consult KWS Engineering for more information



Incorporates an inner ring to the Style CS which provides an additional compression stop and

additional blowout resistance, prevents build-up of process fluid, minimises erosion and turbulence,

shields the gasket, and prevents inward buckling of the gasket. Suitable for use with flat face and

raised face flanges and specified for high pressure/temperature service or where corrosive or toxic

media are present.


Note on use of inner rings: ASME B16.20, which covers spiral wound gaskets, requires the use of

solid metal inner rings in:

• Pressure Class 900, nominal pipe sizes 24” and larger

• Pressure Class 1500, nominal pipe sizes 12” and larger

• Pressure Class 2500, nominal pipe sizes 4” and larger

• All PTFE filled gaskets

• Inner rings for flexible graphite filled spiral wound gaskets shall be furnished unless the

purchaser specifies otherwise.

KWS also recommends the use of inner rings for the following applications:

• Vacuum service or suction side of rotary equipment such as pumps and compressors

• Aggressive media, high pressure or temperature

• Surface finishes smoother than 125 Ra

• If over compression of the gasket is a concern.

It is customary to select inner ring material to be the same as the metal winding.



Basic construction, inner and outer diameters are reinforced with several plies of metal without filler

to give greater stability and better compression characteristics. Suitable for tongue and groove or male

and female or groove to flat face flange assemblies.



Solid inner metal ring acts as a compression stop and fills the annular space between flange bore and

the inside diameter of the gasket. Designed to prevent accumulation of solids, reduce turbulent flow

of process fluids and minimise erosion of flange faces. Suitable for male and female pipe flanges.



Style HE gaskets are used for heat exchangers where pass bars may be required. The outer portion is of standard spiral wound construction,

whereas the pass bar is normally of single or double jacketed style, securely fastened to the I.D. of the spiral wound portion.



This style is identical to the Style HE, except that it is fitted with an

outer guide ring. Note: Style HE and Style HE-CS gaskets have a

primary seal of spiral wound construction with its inherent resiliency

and excellent sealing quality. It is necessary that dimensional drawings

locating the pass bar and the configurations be submitted for all

inquiries and orders for these style gaskets.



The Style HE-CSI is a variation of the style CSI spiral wound gasket,

developed for use on heat exchanger, TEMA type flange arrangements.

In conjunction with an inner ring, the standard spiral wound

construction also supports an outer wound steel nose, designed for the

purpose of accurate gasket location. It is also available with a solid

metal outer ring. Consult KWS Technical Department for

minimum cross sectional width of solid metal outer ring.

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