Page 22 - Design Criteria.qxd

23 ® Welcome to the Next Generation of Sealing Technology
Spiral Wound Gaskets
STYLE HE-CGI WITH SPIRAL WOUND OUTER RING
The Style HE-CGI is a variation of the style CGI 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.
STYLE CG-RJ
This style designates a specially sized CG gasket to be used on standard ring joint flanges. The
outer ring is dimensioned to cover the ring joint grooves and to prevent the spiral wound portion
from entering the groove. This type of gasket should be used only as a maintenance repair item.
CARRIER RING
The carrier ring gasket consists of two spiral wound gaskets placed in a specially machined metal-
lic ring as illustrated. The major advantages of the carrier ring are its high recovery, and ease of
handling compared to standard spirals, due to its integral construction.
STYLE 625
Style 625 spiral wound gaskets are similar to Style R gaskets, with a thickness of 0.0625". These
gaskets are widely used wherever space restrictions indicate the need for a wafer thin gasket design
capable of sealing high pressures.
STYLE T
These gaskets are used for boiler handhole and tube cap assemblies. They are available in round,
oval, obround, square, pear and diamond shapes. Refer to our general catalogue for standard Style
T gaskets. Please note Style T gaskets rely on internal pressure in the boiler to properly seat the
gasket. This means, when a hydrostatic test is performed on the gasket, the pressure exerted against
the plate will further compress the gasket - and it is necessary to tighten each nut to compensate for
the additional compression of the gasket under load.
STYLE M, MC & MCS
These styles are designed for boiler manhole cover assemblies. They are usually of round, obround
or oval shape, depending of course, upon the manhole plate configuration. Style MC gaskets have
pre-formed inner and/or outer rings made of spiral windings. This centering guide permits the gas-
ket to assume its correct position and to compensate for inequalities in plate contours and fillets in
cold-pressed plates as well as to prevent shouldering and pinching caused by radial misplacement.
Style MCS gaskets are manufactured with a solid metal inner and/or outer ring which also prevents
over compression of the gasket in high pressure systems.
Style T
Style 625
Carrier Ring
Style CG-RJ
Style HE-CGI
Cross-Section Through Carrier
Ring Assembly
Spiral Wound
Sealing Element
Machined
Carrier Ring
Style M Style MC Style MCS