Solid Metal Rupture Disk (Bursting Disc)

Select from the following topics:
Benefits
How a Tension-Loaded Disk Works
Standard Manufacturing Ranges
Rupture Tolerance
Specifications
Holder Requirement
Linings
Type BV Disks for Vacuum
Type BR Disks for Low Burst Pressures
Use in Elevated or Cold Temperature Service
Safety Heads for Type B Disks

Benefits

The vents may be supplied with the following:

• Electrical sensor to warn of open vent
• Locking enclosure
• Sealed enclosure for corrosive environments
• Activated reclosing

How a Tension Loaded Disk Works

As the pressure increases on the tension-loaded disk, the seating design allows the dome to thin out until it can no longer withstand the pressure. The disk ruptures. Metal segments fold back against the walls of the fitting in an irregular pattern to provide a full opening. The ultimate tensile strength of the metal determines its failure point when loaded in tension.

Standard Manufacturing Ranges

When you order a rupture disk (bursting disc), a manufacturing range is automatically assigned to the burst pressure you specify. The following table gives the standard manufacturing ranges. A manufacturing range eliminates the necessity for the manufacturer to stock all possible thicknesses of all materials, nearly 100,000 thicknesses in all, to make all burst pressures.

For example, if you order a B Disk to burst at 80 psig, BS&B will enter the order to the shop with the standard manufacturing range (+9,-5), or 75 to 89 psig. BS&B will try for your requested pressure of 80 psig, but will ship the lot of disks if the marked pressure falls between 75 to 89 psig. Once the disk is rated and marked 78 psig, the burst tolerance of ±5% now applies to this stamped pressure.

The standard manufacturing ranges shown in the following table can be reduced by 1/2 or 1/4 for an additional cost. Hastelloy C-276 / Alloy C-276 is available only with standard manufacturing range and 1/2 range.

Standard Manufacturing Ranges for Solid Metal Disks Before the Disk is Stamped

The Type B Rupture Disk (Bursting Disc) must be used in BS&B rupture disk (bursting disc) holder types FA, SA, SF, or UA or other types recommended by and manufactured by BS&B. Substitution of either rupture disk (bursting disc) or rupture disk (bursting disc) holder not manufactured by BS&B not only may affect the burst pressure or opening characteristics of the disk, it also voids BS&B warranty.

Linings and Coatings

1. All liners have passed a spark test to assure pinhole-free condition.
2. Protective ring is required for solid metal disks with fluoropolymer lining on both sides in all disk materials except aluminum. Specify Type BR, BRV, or BRSV.

Lining Specifications:

Linings:

Standard materials: FEP plastic (Teflon®*)
Maximum Temperature: 400 °F
Special materials: TFE plastic (Teflon®*)
Maximum Temperature: 500 °F
(Teflon® generally is used. Other appropriate fluorpolymers may be supplied. Teflon® is a registered trademark of Dupont.)
Coatings:Vinylite, a mild corrosion retardant for disk metal, can be applied to one or both sides of disk.
Maximum temperature: 150 °F (66 °C)

Type BV Disks for Vacuum Applications

If backpressure on convex (atmospheric) side of the disk ever exceeds the pressure applied to the concave (pressure) side of the disk, a vacuum support may be required. Supports are not required for all disks. Consult the table below