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

IMB
Monoblock Graphite Disks

Inverted MonoBloc disks are available to fit ANSI Class 150, Class 300 and Class 600 flanges for use in intermediate burst pressure applications up to 1000 psi.

When using an inverted MonoBloc disk in application:

  • If a vacuum support is required, Model MBV™ disks must be specified
  • Temperature ranges -100 degrees Fahrenheit to +400 degrees Fahrenheit (-73 degrees Celsius to 200 degrees Celsius)
  • Armoring is recommended for all graphite disks for added safety, easier installation and elimination of breakage during installation
  • Armor reduces the possibility of a premature burst due to uneven or excessive torqueing of the flange studs
  • All IMB™ disks supplied with integral gaskets
  • Available for installation between ANSI, DIN, AFNOR, BS and JIS pipe flanges & located inside the bolt circle

Inverted MonoBloc disks are supplied for ANSI Class 150, Class 300 and Class 600 flanges and in higher burst pressures than Model MB™ disks.

IMB Specifications

Nominal Size
Burst Ratings
Internal
Diameter
Disk Thickness
Barg PSIG
mm
in.
min.
max.
min.
max.
mm
in.
mm
in.
1.5 0.5 1.72 17.2 25 250 15.9 0.625 16 0.625
20 0.75 1.72 17.2 25 250 21.0 0.825 16 0.625
25 1 0.69 17.2 10 250 27.2 1.07 22 0.875
40 1.5 0.49 17.2 7 250 41.1 1.62 22 0.875
50 2 0.21 17.2 3 250 52.6 2.07 22 0.875
80 3 0.14 17.2 2 250 78.0 3.07 22 0.875
100 4 0.10 17.2 1.5 250 103.4 4.07 22 0.875
150 6 0.069 11.7 0.5 170 154.2 6.07 22 0.875
200 8 0.035 11.7 0.5 170 205.0 8.07 29 1.125
250 10 0.017 10.3 0.25 150 255.8 10.07 38 1.50
300 12 0.017 10.3 0.25 150 306.6 12.07 51 2.00
325 14 0.017 10.3 0.25 150 336.5 13.25 57 2.25
400 16 0.017 10.3 0.25 150 387.4 15.25 64 2.50
450 18 0.017 10.3 0.25 150 438.2 17.25 70 2.75
500 20 0.017 10.3 0.25 150 489.0 19.25 76 3.00
600 24 0.017 10.3 0.25 150 590.6 23.25 76 3.00
15 0.5 1.72 69 25 1000 15.9 0.625 16 0.625
20 0.75 1.72 69 25 1000 21.0 0.825 16 0.625
25 1 0.69 69 10 1000 27.2 1.07 25 1.00
40 1.5 0.49 69 7 1000 41.1 1.62 25 1.00
50 2 0.21 34.5 3 500 52.6 2.07 25 1.00
80 3 0.14 34.5 2 500 78.0 3.07 32 1.25
100 4 0.10 34.5 1.5 500 103.4 4.07 32 1.25
150 6 0.069 31 1 450 154.2 6.07 44 1.75
200 8 0.035 31 0.5 450 205.0 8.07 57 2.25