Performance Features

  • Unique, two-way acting HiLo disk prevents vessel damage from overpressure or implosion under vacuum
  • Vacuum pressure relief through reverse buckling of the disk (lo-side)
  • Positive pressure relief through forward acting burst of the disk (hi-side)
  • Available in sizes 2 to 12 inches (50 to 300 mm)
  • Temperature capability up to 400°F (200°C)
  • Set pressures starting at 5 inch water column and up (12.5 mBar)
  • Gas service (acceptable for liquid service with a compressible gas / vapor pocket between the liquid and disk. Minimum 20 pipe diameter gas volume on process and vent side of disk)
  • TSE-BSE Free
  • BS&B proprietary technology

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  • Sizes & Pressures
  • Burst Tolerance
  • Safety Heads & Sensors
  • Documentation

Sizes & Pressures

Fluoropolymer Seal Burst Pressure Range from 50°F to 150°F (10°C to 65°C)
Disk Size Low Pressure Direction Burst Pressure High Pressure Direction Burst Pressure
WC inches mbar psi bar
in mm min max min max min max min max
50 10 51 25 127 11 28 0.8 1.9
3 80 6 36 15 90 8 28 0.6 1.9
4 100 5 28 12.5 70 7 28 0.5 1.9
6 150 6 19 15 47 4 22 0.3 1.5
8 200 5 15 12.5 37 3 22 0.2 1.5
Available with other pressure/temperature combinations. Contact BS&B.

Chemfilm® DF2919 Seal Burst Pressure Range from 50°F to 400°F (10°C to 204°C)
Disk Size Low Pressure Direction Burst Pressure High Pressure Direction Burst Pressure
WC inches mbar psi bar
in mm min max min max min max min max
50 18 300 45 747 39 75 2.7 5.2
3 80 7 300 17.5 747 28 75 1.9 5.2
4 100 5 300 12.5 747 22 75 1.5 5.2
6 150 6 300 15 747 15 75 1 5.2
8 200 5 300 12.5 747 12 75 0.08 5.2
For some combinations of size, temperature and burst pressures: Temperature range is -100ºF to 350ºF (-73C to 176ºC). Chemfilm is a registered trademark of Saint-Gobain Performance Plastics Corporation.

Burst Tolerance

Hi direction burst tolerance
Specified Burst Pressure Burst Tolerance
psig barg
> 4 to 9 > 0.3 to 0.6 ± 20%
> 9 to 13 > 0.6 to 0.9 ± 15%
> 13 to 18 > 0.9 to 1.2 ± 10%
>18 to 25 > 1.2 to 1.7 ± 7%
> 25 > 1.7 ± 5psig

Lo direction and RLB disk burst tolerance
Specified Burst Pressure Burst Tolerance
inch WG mbar
< 8 < 2.76 ± 1.5 in WG (3.8mbar)
> 8 > 2.76 ± 20%

Hi direction manufacturing design range
Specified Burst Pressure Burst Tolerance
psig barg
≤ 40 ≤ 2.76 ± 2psig (0.1bar)
> 40 > 2.76 - 10%

Product Literature

Bio-Saf Series
Burst Alert Sensors
Detec Saf Alarm System - Burst Disk Monitor