Page 120 - GarlockFluidSealing2010

Gasket Selection
Sprial Wound Gaskets
One of the best all-around seals, the spiral wound
gasket offers a low-cost solution that has the ability to
handle temperature and pressure fuctuations. Multiple
plies of metal and fller in the spiral create a barrier that
reduces the possibility of leaks.
Other Metal Gaskets
Garlock manufactures a wide variety of double-
jacketed, spiral-wound, metal-clad and solid metal
gaskets for heat exchanger and coker applications.
GRAPHONIC® and Kammprofle gaskets are also avail-
able in heat exchanger confgurations.
Temperature and Chemical
Considerations
Be certain that the gasket you order is as resistant
as possible to the media and temperature involved.
Check the chemical compatibility of the metal as well
as the fller material for the media to be sealed. As a
general rule, the metal used in either the spiral wind-
ing or double-jacketed gasket should be similar to the
fange material.
The compressibility of fexible graphite makes it
an excellent fller material for metallic gaskets. Flexible
graphite may be used in services with temperatures
up to 950°F (485°C), though it should not be used with
strong oxidizers such as nitric or sulfuric acid.
PTFE fller material provides excellent chemical
resistance at temperatures below 500°F (260°C). In ac-
cordance with ASME B16.20, an inner ring is required
when using conventional PTFE fller materials, in order
to protect the winding from radial buckling.
See page D-19 for the temperature limits of com-
mon metals and fller materials.
Operating Pressure
Operating pressures have a direct effect on the
construction and selection of metallic gaskets. Higher
pressures raise the potential for gasket blowout, while
lower pressure applications require a gasket design
that seals under lower bolt loads.
Garlock gaskets suitable for high pressure include:
¦Kammprofle gaskets
¦Spiral wound gaskets with inner ring
¦Solid metal gaskets
Low pressure gaskets include:
¦GRAPHONIC® gaskets
¦Garlock Kammprofle gaskets
¦The Garlock EDGE® gasket
D-2
WARNING:
Properties/applications shown throughout this brochure are typical. Your specifc applica-
tion should not be undertaken without independent study and evaluation for suitability.
For specifc application recommendations consult Garlock. Failure to select the proper
sealing products could result in property damage and/or serious personal injury.
Performance data published in this brochure has been developed from feld testing,
customer feld reports and/or in-house testing.
While the utmost care has been used in compiling this brochure, we assume no respon-
sibility for errors. Specifcations subject to change without notice. This edition cancels
all previous issues. Subject to change without notice.