FSM™ - Saf-t-Graf™

Fail-Safe Graphite Rupture Disk

FSM™ - Saf-t-Graf™

Performance Features

  • Same burst pressure in both directions
  • Designed for gas, liquid and multi-phase service
  • Suitable for operating pressure to 80% of the marked burst pressure (85% of the minimum)
  • Vacuum resistant (additional vacuum support required for some burst pressures)
  • Vacuum resistant for burst pressures ≥ 22psig
  • Available with ASME “UD” (select 0% Manufacturing Design Range)
  • Pressure Equipment Directive “CE” marking and/or other International Certifications
  • Optional fluoropolymer coating
  • Optional Armor ring
  • Optional HTA™ High Temperature Assembly
  • BS&B proprietary technology

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  • Sizes & Pressures
  • Burst Tolerance
  • Armored Option
  • Sensors
  • Documentation

Sizes & Pressures

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

Disk Size Burst Pressure Disk Thickness ANSI Flange Rating DIN
psig barg
in mm min max min max in mm
0.5 15 25 250 1.7 17 0.6  16 150 10/16
0.5 15 25 1000 1.7 69 0.6  16 300/600 25/40
0.75 20 25 250 1.7 17 0.6  16 150 10/16
0.75 20 25 1000 1.7 69 0.6  16 300/600 25/40
1 25 10 250 0.7 17 0.9 22 150 10/16
1 25 10 1000 0.7 69 0.9 25 300/600 25/40
1.5 40 7 250 0.5 17 0.9 22 150 10/16
1.5 40 7 1000 0.5 69 1.0 25 300/600 25/40
2 50 2 250 0.1 10.3 0.9 22 150 10/16
2 50 3 500 0.2 34 1.0 25 300/600 25/40
3 80 1 250 0.1 17 0.9 22 150 10/16
3 80 2 500 0.1 34 1.2 32 300 25/40
4 100 1 250 0.1 17 0.9 22 150 10/16
4 100 1.5 500 0.1 34 1.3 32 300 25/40
6 150 1 170 0.1 12 0.9 22 150 10/16
6 150 1 450 0.1 31 1.8 44 300 25/40
8 200 0.5 170 0.04 12 1.1 29 150 10/16
8 200 0.5 450 0.04 31 2.3 57 300 25/40
10 250 0.3 150 0.02 10 1.5 38 150 10/16
12 300 0.3 150 0.02 10 2.0 51 150 10/16
14 350 0.3 150 0.02 10 2.3 57 150 10/16
16 400 0.3 150 0.02 10 2.5 64 150 10/16
18 450 0.3 150 0.02 10 2.8 70 150 10/16
20 500 0.3 150 0.02 10 3.0 76 150 10/16
24 600 0.3 150 0.02 3.4 3.0 76 150 10/16

Burst Tolerance

Marked Burst Pressure Burst Tolerance
< 1 psig (0.07 barg) -0/+0.75 psig (0/0.05 barg)
1 - 15 psig (0.07 barg < 1.03 barg) ± 0.75 psig (0.05 barg)
> 15 psig (1.03 barg) ± 5%
For sizing, see the BS&B website or contact BS&B for appropriate KR

Example: If a Saf-T-Graf FSM type disk is ordered with a 29 psig (2 bar) burst pressure, it will burst between 27.5 psig (1.9 bar) and 30.5 psig (2.1 bar). For reduced tolerances contact BS&B.

Armored Option

Armor is recommended for all graphite disks for added safety and elimination of breakage during installation. Armor consists of a steel ring encircling the outside diameter of the graphite rupture disk.

Armor is standard on disks with burst pressures in excess of 150 psig or to fit ANSI Class 300 / 600 flanges. Carbon steel armor is standard with 300 series stainless steel as an option. Armor is recommended for applications where lateral blow out / loss of containment represents a safety concern.

Armor for disks sizes shown when rated pressures equal to or exceed values in the below chart.

Size Burst Pressure
in mm psig barg
0.5 - 3 15 - 80 150 10.3
4 100 100 6.9
6 - 10 75 75 5.2
12 - 24 50 50 3.5

Product Literature

FRB™ Rupture Disk Brochure
Threaded Rupture Disk Assemblies Brochure
Custom Engineered Products
Burst Alert Sensors Brochure

Installations

FRB™ Installation Instructions
Burst Alert Leak Dectector Installation Instruction
Burst Alert Sensor Installation Instruction