SRB-7RS™ Safety Heads (Holders)

Pre-Torqued Safety Head

SRB-7RS™ Safety Heads (Holders)

Performance Features

  • Insert type safety head that fits inside the bolt circle of companion flanges to allow for easy installation and removal
  • Pre-torqued capscrews clamp the rupture disk within the safety head, independently of companion flange bolts, which allows for future removal, inspection, and re-installation
  • A J-bolt ensures the safety head is fitted in the required direction between companion flanges by engaging a blind hole drilled on the inlet companion flange perimeter
  • Asymmetric alignment pins in the safety head mate with locating holes in the rupture disk, ensuring centering and correct orientation of the rupture disk within the safety head
  • Flow arrows on the side of the safety head indicate correct directional installation with process flow
  • Proprietary ‘bite seal’ on flat seating surface to optimize sealing between rupture disk and safety head process side allowing leak tightness of 10^-6cc/s He or greater
  • Can be equipped with pressure tapping in either inlet or outlet to allow installation of monitoring devices and sensors
  • For use with flanged piping connections; Raised face, Ring joint and tongue and groove flange facings. Designed for multi flange ratings and piping standards
  • The rupture disk dome fully protected within safety head inlet to avoid damage when installed into piping system
  • Available in Torque resistant version, specify SRB-7RS-TR
  • Available as a double disk assembly

Request a Quote

  • Sizes & Pressures
  • Disks & Sensors
  • Materials & Option
  • Accessories
  • Documentation

Sizes & Pressures

Disk Size Safety Head Flange Rating Face-to-Face Dimensions
in mm ANSI DIN JIS in mm
1 25 150 10/16 10/16 1.48 38
1 25 300/600 25/40 20/30/40 1.48 38
1 25 900/1500 * * 3.00 76
1.5 40 150 10/16 10/16 1.68 43
1.5 40 300/600 25/40 20/30/40 1.68 43
1.5 40 900/1500 * * 2.60 66
2 50 150 10/16 10/16 1.88 48
2 50 300/600 25/40 20/30/40 1.88 48
2 50 900/1500 * * 3.375 85
3 80 150 10/16 10/16 2.17 55
3 80 300/600 25/40 20/30/40 2.17 55
3 80 900 * * 3.50 89
4 100 150 10/16 10/16 2.88 73
4 100 300 25/40 20/30/40 2.88 73
4 100 600 * * 2.50 67
6 150 150 10/16 10/16 3.624 92
6 150 300 25/40 20/30/40 3.624 92
6 150 600 * * 3.062 79

Disk Size Safety Head Flange Rating Face-to-Face Dimensions
in mm ANSI DIN JIS in mm
8 200 150 * * 3.75 95
8 200 300 * * 3.75 95
10 250 150 * * 4.313 109
10 250 300 * * 4.313 109
12 300 150 * * 4.625 117
12 300 300 * * 5.25 133
14 350 150 * * 5.25 133
14 350 300 * * 5.875 149
16 400 150 * * 6.375 162
16 400 300 * * 7.125 181
18 450 150 * * 7.375 187
18 450 300 * * 7.875 200
20 500 150 * * 8.437 214
20 500 300 * * 8.625 219
24 600 150 * * 10.25 260
24 600 300 * * 10.75 273
30* 750 150 * * 12 305
36* 900 300 * * 15 381
*Applicable to ASME Series A
Contact BS&B for other sizes, ratings, or face-to-face dimensions.

Standard Materials

316 stainless steel and carbon steel.

Also available Monel® alloy 400, Inconel® alloy 600, Hastelloy® alloy C and C-276, aluminum, and titanium.

Torque Resistant Safety Head Option

The Type TR™ Series torque resistant safety head option offers the identical performance and flow characteristics valued from standard BS&B safety heads. The only difference – the TR Series Safety Heads are designed with a wider seating surface to be used with metal spiral wound gaskets at the flange. This distinct safety feature protects rupture disks from situations where plant personnel may overtorque rupture disks within piping systems.

Because of the wider seating surface of the TR Series Safety Head, the load is distributed over a much broader area reducing the influence of excessive torque transmitted to the disk.

Double Disk Assembly

Double disk assemblies consist of three safety head components; an inlet, a mid-flange and an outlet with a disk installed between the inlet and mid-flange. A second disk is installed between the mid-flange and outlet flange. All Sta-Saf safety heads models are available as double disk assemblies.

Double disk assemblies are available with the TR™ torque resistant option.

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

Sta-Saf System Brochure
Burst Alert Sensors Brochure

Installations

Sta-Saf™ System Installation Instructions
Burst Alert Leak Dectector Installation Instruction
Burst Alert Sensor Installation Instruction