HiLo-S™ - Bio-Saf™

Higher Temperature Ultra Low Pressure Two Way Acting Rupture Disk


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
  • Accessories
  • 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
2  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
2  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%

Accessories

BS&B supplies many of the accessories required to safely and conveniently install our overpressure relief devices and complementary products. Through our professional team and global network of sales engineers and procurement personnel, we are able to provide the highest quality accessory products to meet your installation requirements.

Saf-T-Change Quick Disk Replacement (QDR)

After activation, the replacement disk is quickly slid into place. Saving hours of lost production due to blown rupture disks.

Tell-Tale Assemblies & Excess Flow Valves/Gauges

A gauge tap in the outlet flange of the safety head may be considered when the safety head is installed in a vertical position.

Spare Safety Heads & Cap Screws

Jackscrews

When activated, the jackscrews effectively separate the flanges, providing adequate clearance to remove or insert a safety head and external gaskets.

Lifting Lug Eye Bolts

Eye bolts are recommended when weight and/or accessibility is a factor in lifting safety heads.

Baffle Plate

When a safety head is free-vented to atmosphere, a baffle plate may be considered to disperse overpressure and absorb recoil.

Product Literature

Nacional Safety Valves Corporate Profile Brochure
Model 5100 Brochure

Installations

Model 5100 Installation Instructions