Page 240 - Valve Selection Handbook

Rupture Discs 227

support and on the convex side an integral cap that protects the bursting
disc from inadvertent damage during handling.
Advantages of solid forward-domed rupture discs are simple design,
more cost-effective, and suitability for liquids and gases.
Disadvantages are the operating ratio is limited to 70% or less; they
are not normally suited for periods of vacuum or back pressure unless
provided with vacuum or back-pressure support; they may not be suitable
for pulsating pressure; and the disc may fragment upon failure.

Slotted and lined forward-domed rupture discs. This is a multi-lay-
ered forward-domed rupture disc in which the dome of the top member is
slotted with pierced holes at each end. The second layer is the seal mem-
ber, commonly made of fluorocarbon or an exotic metal. A vacuum sup-
port that may be required is the third component. Figure 6-9 illustrates
the three layers of the disc.

Figure 6-9. Slotted and Lined Forward-Domed Rupture Disc. (Courtesy of Anderson,
Greenwood & Company.)