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.
STYLE HE-CSI WITH SPIRAL WOUND OUTER RING
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.
Address:No 48/1, Andishe Ave, Binalood Indust. Mashhad, iran
Flat No.4, 10,First Alley, Arabali St. Khoramshahr Ave. Tehran. Iran
Tel: +98 021 88526151 - 88765270 - 88754600
Fax: +98 021 88765198