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Type F Gaskets
Type F gaskets are designed to fit the raised face portion
of flanges. The outside diameter of the gasket is slightly
smaller than the inside diameter of the bolt hole circle.
The outside diameter is designed for alignment by the insulating
sleeves. The central gaskets are available in the same materials
as Type E. Upon installation, it is recommended that tape
be wrapped around the outside of the flange to prevent foreign
material from lodging between the exposed portions and causing
"shorting out" of the flanges.
Type E Gaskets
Type E gaskets are designed for full protection of flanges,
and have the same outside diameter as the flange. Each gasket
has precision-located bolt holes. Upon installation, it is
recommended that tape be wrapped around the outside of the
flange to prevent foreign material from lodging between the
exposed portions and causing "shorting out" of the
flanges. All Type E gaskets are easily centered with the flange
inside diameter. Gaskets with slightly larger outside diameters
are available on request.
Type D Gaskets
Type D gaskets are insulating ring joint gaskets made to fit
the ring groove of Ring Type Joint flanges. The Type D central
gasket is made of medium weave fabric-reinforced phenolic,
manufactured to ASA (ANSI) gasket dimensions. Properties are
similar to those of phenolic flat central gaskets and are
available in the basic octagonal shapes. Oval shapes can be
ordered by special request. When installing Type D gaskets,
it is also recommended that tape be wrapped around the outside
of the flange to prevent foreign material from lodging between
the exposed portions and causing "shorting out"
of the flanges. Alignment pins should be used whenever possible
to assure proper alignment of flanges when installing all
flange insulation sets. Pins should be a minimum of 3/32"
(2.38mm) larger than the bolt size.
OVAL: The oval cross-section is the original
ring joint design. (NOT STANDARD)
OCTAGONAL: The octagonal cross-section is
a modification of the oval design and provides better sealing
performance. (STANDARD)
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