Rupture Disk
The original rupture disk (bursting disc) manufacturer shaping the growth of pressure relief devices for over 80 years.

MRB High Pressure
Rupture Disk (Bursting Disc)

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

  • Sizes 3/8" to 4"
  • Pressure Ratings available up to 70,000 psig
  • Opens full bore with no flow restrictions
  • Design assures long service life with a very high resistance to fatigue
  • Non-torque sensitive
  • Maximum Operating Pressure to 90% of disk pressure rating
  • No knife blades required for opening
  • Use in gas or liquid service
  • Designed to adapt to customer's unique application

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.