XT Forward Acting Disks

Performance Features

  • Smooth surface on process side; resistant to product accumulation
  • Designed for gas, liquid and multi-phase service
  • Suitable for operating pressure to 80% of the marked burst pressure (85% of the minimum)
  • Designed for non-fragmentation, recommended for Relief Valve isolation
  • Damage safety ratio ≤ 1
  • Suitable for cycling service
  • Vacuum resistant
  • Available with ASME “UD” (select 0%, -5%, -10% Manufacturing Design Range)
  • Pressure Equipment Directive “CE” marking and/or other International Certifications
  • BS&B proprietary technology


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

Sizes & Pressures

XT™ Gas Service Disk Specifications Minimum/Maximum Pressure with Rating at 72° (22°C)

Disk Size Nickel Alloy 200 & Tantalum Monel® Alloy 400 & Inconel® Alloy 600 Hastelloy® Alloy C-276 316SS Aluminum
in mm psig barg psig barg psig barg psig barg psig barg
min max min max min max min max min max min max min max min max min max min max
1 25 165 1450 11 100 165 1450 11 100 240 1450 17 100 175 1450 12 100 80 1450 6 100
1.5 40 115 1450 8 100 115 1450 8 100 176 1450 12 100 125 1450 8.6 100 55 1450 4 100
2 50 105 1450 7 100 105 1450 7 100 160 1450 11 100 115 1450 8 100 45 1450 3 100
3 80 90 1300 6.2 90 90 1300 6.2 90 140 1300 10 90 100 1300 7 90 45 1300 3 100
4 100 90 1150 6.2 79 90 1150 6.2 79 140 1150 10 79 95 1150 7 79 40 1150 3 79
6 150 90 1040 6.2 71 90 1040 6.2 71 130 1040 9 72 90 1040 6.2 72 40 1040 3 72
8 200 85 960 5.9 66 85 960 5.9 66 130 960 9 66 90 960 6.2 66 40 960 3 66
10 250 85 840 5.9 58 85 840 5.9 58 125 840 8.6 58 90 840 6.2 58 - - - -
12 300 85 720 5.9 49.6 85 720 5.9 49.6 125 720 8.6 49.6 90 720 6.2 49.6 - - - -


XT™ Liquid Service Disk Specifications Minimum/Maximum Pressure with Rating at 72° (22°C)

Disk Size Nickel Alloy 200 & Tantalum Monel® Alloy 400 & Inconel® Alloy 600 Hastelloy® Alloy C-276 316SS Aluminum
in mm psig barg psig barg psig barg psig barg psig barg
min max min max min max min max min max min max min max min max min max min max
1 25 250 1450 17.2 100 250 1450 17.2 100 250 1450 17.2 100 250 1450 17.2 100 250 1450 17.2 100
1.5 40 150 1450 10.3 100 150 1450 10.3 100 200 1450 13.8 100 150 1450 10.3 100 150 1450 10.3 100
2 50 150 1450 10.3 100 150 1450 10.3 100 185 1450 12.7 100 150 1450 10.3 100 150 1450 10.3 100
3 80 150 1350 10.3 93.1 150 1350 10.3 93.1 150 1350 10.3 93.1 150 1350 10.3 93.1 150 1350 10.3 93.1
4 100 120 1150 8.3 79.3 130 1150 9 79.3 130 1150 9 79.3 130 1150 9 79.3 80 1150 5.5 79.3
6 150 90 1040 6.2 71.7 100 1040 6.9 71.7 150 1040 10.3 71.7 100 1040 6.9 71.7 70 1040 4.8 71.7
8 200 75 960 5.2 66.2 90 960 6.2 66.2 130 960 9 66.2 90 960 6.2 66.2 60 960 4.1 66.2
10 250 60 840 4.1 57.9 85 840 5.9 57.9 125 720 8.6 57.9 90 840 6.2 57.9 - - - -
12 300 85 720 5.9 49.6 85 720 5.9 49.6 125 720 8.6 49.6 90 720 6.2 49.6 - - - -
Optional liner; liners are available in all sizes on the process or downstream side (or for both; consult factory). Fluoropolymer film application range -40°F (-40°C) to 500°F (260°C)

Burst Tolerance

Marked Burst Pressure Burst Tolerance
≤ 40 psig (2.76 barg) ± 2 psig (0.138 barg)
> 40 psig (2.76 barg) ± 5%

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

Nu-Saf™ Series Scored Forward Acting Rupture Disks
Burst Alert Sensors
Saf-T-Change™ QDR Rupture Disk Replacement System
Detec Saf Alarm System - Burst Disk Monitor