Heat Shields Datasheet0 pages

HEAT SHIELDS

USE OF HEAT SHIELDS FOR TEMPERATURE
REDUCTION
Heat Shields are typically used to reduce the process
temperature to which a rupture disc is exposed. This
may be necessary when the rupture disc is manufactured from materials which are not capable of withstanding high process temperatures. Heat Shields are
used where fluoropolymer or other exotic material
liners are required for corrosion resistance or as part
of the rupture disc itself in combination with high
process temperature.
The C.D.C. Heat Shield is constructed as a flat metal
component for direct installation between bolted pipe
flanges upstream of the rupture disc. It is slotted to
allow the transmission of pressure to the rupture disc
and to provide full opening upon bursting of the
rupture disc. It functions as a barrier restricting the
continuous flow of high-temperature gases or vapors.
This allows the piping between the Heat Shield and
rupture disc to act as a heat sink to the dead space
and effectively reduce the temperature to which the
rupture disc is exposed.
There are many factors which must be considered in
evaluating the required length of the spool assembly
to achieve an adequate heat sink. Therefore, no
single rule can be suitable for all of the possible
applications. The actual temperature drop is best
determined by the end user taking into consideration
the following design parameters.

• Total surface area of the spool assembly and
rupture disc.
• The transmission of heat to rupture disc by
radiation, conduction, and convection.

DOWNSTREAM
RUPTURE DISC

OUTLET
COMPANION
FLANGE

GASKETS
HOLDER OUTLET

CONTINENTAL
RUPTURE DISC
HOLDER
(7I INSERT SHOWN)

INLET
COMPANION
FLANGE

HEAT SHIELD**
(OPTIONAL
LOCATION)

HOLDER
INLET
GASKETS

HEAT SHIELD
(PREFERRED
LOCATION)

OUTLET
COMPANION
FLANGE

• Maximum (rated) temperature of the rupture
disc.
• The maximum expected temperature exposed to
the exterior of the assembly. (Note that the
rupture disc and spool assembly can not be
insulated.)
• Attachment of other exterior cooling devices.

GASKETS

INLET
COMPANION
FLANGE

UPSTREAM

• Process media.

**For reverse-buckling type rupture discs, the Heat Shield cannot be located directly under the holder inlet.

SPOOL ASSEMBLY
(AS DETERMINED
BY USER)