Highlights
For high pressure applications. MRB (The Machined Reverse Buckling Rupture Disk (Bursting Disc)) offers a one-piece design including both disk and housing. It is a uniform metal slug machined to a thin diaphragm in the center and then formed. When the reversal pressure is reached the disk snaps through and shears out completely at the disk/housing junction
Features
Sample MRB Installations
Selection Data
Specifications for Standard MRB Rupture Disks
Min/Max Pressure Ratings at 72° F. (psid)
| Nominal Size (Inches) | A (Inches) | B (Inches) | C (Inches) |
| 3/8 | .965 | .375 | .375 |
| 1/2 | 1.000 | .375 | .500 |
| 5/8 | 1.250 | .375 | .625 |
| 3/4 | 1.500 | .500 | .750 |
| 1 | 2.000 | .625 | 1.000 |
| 1-1/2 | 2.750 | 1.000 | 1.500 |
| 2 | 3.500 | 1.250 | 2.000 |
| 3 | 4.750 | 1.750 | 3.000 |
| 4 | 6.000 | 2.500 | 4.000 |
*Consult factory for availability of other materials or pressure ratings.
Engineering Information
Minimum and maximum pressure ratings are applicable at 72° F.
Manufacturing Range:
Available with either 2%, 5% or 10% manufacturing range. The total range is placed on the minus side of the requested rating.
Example:
If a 20,000 psig MRB is ordered with a 10% manufacturing range, it may be tagged at any pressure between 20,000 psig and 18,000 psig.
Burst Tolerances: ± 5%
Tolerances are the maximum variation from the above tagged burst pressure.
Recommended maximum temperatures for each metal are:
| Hastelloy C-276 | 900° F. |
| Inc/Alloy 600 | 900° F. |
| 304L SS | 900° F. |
Burst Pressure Capability
| Disk Size (Inches) | Disk Material* | |||||
| Hastelloy C-276 | Inconel/Alloy 600 | 304 L SS | ||||
| Min | Max | Min | Max | Min | Max | |
| 3/8 | 4300 | 49,000 | 4500 | 55,000 | 6000 | 70,000 |
| 1/2 | 3800 | 48,000 | 4000 | 54,000 | 4900 | 70,000 |
| 5/8 | 3500 | 46,000 | 3500 | 52,000 | 4400 | 66,000 |
| 3/4 | 2900 | 44,000 | 3100 | 49,000 | 3900 | 62,000 |
| 1 | 2500 | 39,000 | 2500 | 43,000 | 3400 | 56,000 |
| 1-1/2 | 2100 | 31,000 | 1900 | 35,000 | 2800 | 45,000 |
| 2 | 1900 | 25,000 | 1800 | 29,000 | 2500 | 37,000 |
| 3 | 1600 | 18,000 | 1500 | 21,000 | 2200 | 27,000 |
| 4 | 1500 | 14,000 | 1500 | 16,000 | 2000 | 21,000 |
*Consult factory for availability of other materials or pressure ratings.
STANDARD DESIGN
NOTE: Products, specifications, and all data in this literature are subject to change without notice. Questions regarding product selection and specifications for specific applications should be directed to BS&B, Attn: Customer Service Dept.