Double Disc Assembly

Double Disc Assembly

A Double Disc Holder Assembly consists of three holder components: an inlet, a midflange and an outlet piece, along with two rupture discs. The first of the two rupture discs is located between the inlet and the mid-flange, and the second rupture disc is between the mid-flange and outlet. This assembly arrangement provides the solution to multiple applications without the need of a more complicated piping arrangement. Double disc holders are available for: HPX®, UNISERT, LOTRX®,7I, RCS



Rupture Disc Leak Detection
A must with toxic or very valuable contents. Extremely corrosive conditions or damage could cause the process exposed rupture disc to leak. A pressure gauge in the mid-flange would indicate the leak, while a second rupture disc maintains the system leak free. The first rupture disc could then be changed out at an opportune time.

Actuated Rapid Opening Device
By pressurizing the space between the two rupture discs in an HPX Double Disc Assembly, one can obtain a quick opening device. Upon dumping the pressure between the two rupture discs, full open area is obtained within a few milliseconds. An HPX Double Disc Assembly, as a quick opening device, has been used in activating pressure systems, and to test systems for sudden pressure changes.

Elimination of Back Pressure
The second rupture disc withstands the system back pressure, isolating the first rupture disc. Any change in pressure differential across the first rupture disc induced by back pressure is eliminated and it will rupture at its rated burst pressure. The second rupture disc may be rated at a lower burst pressure to compensate for the maximum back pressure that may coincide with a burst condition.


Nominal Size Range: 1"" - 36"" (25mm - 900mm)

Burst Pressure Range: 0psig - 0psig (0barg - 0barg)

Recommended Operating Ratio: % of the rupture disc's rated (stamped) burst pressure.

Seating Configuration: Flat Seat or 30° Seat

Service: Liquid or Gas

B.D.I.® Alarm System Compatible?: No

ASME Code Symbol Stamp Available? : No

Contact the factory for nominal sizes, materials of construction or disc types not shown.


ENVIRO GUARD® Pipe End Covers

Provide protection of piping, rupture discs, and safety relief valves from unwanted foreign material, rain, insects and/or birds by specifying and installing a ENVIRO GUARD pipe end cover. The ENVIRO GUARD pipe end cover is fabricated from a tough PTFE coated/impregnated fiberglass material suitable for use in harsh environments and temperatures up to 500°F (260°C). It is available for 90° or 45° pipe ends and may be purchased with an optional retrieval rope to retain cover near the location after venting.

Heat Shield

Heat Shields are typically used to reduce the process temperature to which a rupture disc (bursting disc) is exposed. Heat Shields are used where fluoropolymer or other exotic material liners are required for corrosion resistance or as part of the rupture disc (bursting disc) itself in combination with high process temperature.


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