Vacuum systems are engineered to operate under external (atmospheric) pressure loads, and were never intended for internal pressurization. Accu-Glass burst discs are important and preventative safety devices designed to protect vacuum systems against accidental over-pressurization. Failure of internal gas or cryogenic fluid supply lines can lead to rapid pressurization inside a vacuum vessel — well above its internal load limits. Besides protecting delicate system instruments and equipment — such as vacuum viewports — burst discs (burst disk) minimize the risks of injury to system operators and personnel.
How do Vacuum Burst Discs Work?
Simple — pressure buildup inside a vacuum vessel deforms a concave thin metal-foil diaphragm, pushing it against radial spikes built into a burst disc's housing. The diaphragm ultimately ruptures providing an instant pressure relief path for a vessel's internal volume. In the case of our low-pressure devices, a unique stress-pattern is scored right onto the metal diaphragm, effectively pre-stressing it for precise pressure and rupture control. Accu-Glass burst discs are available and certified for two pressure ranges. Low-pressure units (scored diaphragm) have a large 1.93 square-inch deflection area and rupture between 7.5 and 11.5 psi. High-pressure units (puncture type) rupture between 15 and 25 psi and have a smaller 1.2 square-inch deflection area. Note that a ruptured burst disc cannot be repaired! Once a unit fails, it must be replaced in order to make a vacuum system operational again.
Caution! Note that AG burst-disc ratings are @22.2°C (72°F), so operating these devices at higher temperatures will reduce their burst pressure rating.
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