SR-7R™ Safety Heads (Holders)

Pre-Assembled Safety Head

SR-7R™ 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-Assembled cost-effective solution
  • 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 SR-7R-TR

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  • 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 1.25 31.75
1 25 300/600 25/40 20/30/40 1.25 31.75
1 25 900/1500 * * 1.75 31.75
1.5 40 150 10/16 10/16 1.25 31.75
1.5 40 300/600 25/40 20/30/40 1.25 31.75
1.5 40 900/1500 * * 1.44 36.58
2 50 150 10/16 10/16 1.25 31.75
2 50 300/600 25/40 20/30/40 1.25 31.75
2 50 900/1500 * * 1.625 41.15
3 80 150 10/16 10/16 1.41 34.95
3 80 300/600 25/40 20/30/40 1.5 38.1
3 80 900 * * 1.75 44.45
4 100 150 10/16 10/16 1.72 43.66
4 100 300 25/40 20/30/40 1.72 43.66
4 100 600 * * 1.72 43.66
6 150 150 10/16 10/16 2.5 63.5
6 150 300 25/40 20/30/40 2.5 63.5
6 150 600 * * 3.125 79.37

Disk Size Safety Head Flange Rating Face-to-Face Dimensions
in mm ANSI DIN JIS in mm
8 200 150 * * 3.375 85.73
8 200 300 * * 3.375 85.73
10 250 150 * * 6.0 152.4
10 250 300 * * 6.0 152.4
12 300 150 * * 4.56 144.48
12 300 300 * * 5.5 139.7
14 350 150 * * 5.625 142.88
14 350 300 * * 5.625 142.88
16 400 150 * * 6.375 161.93
16 400 300 * * 7.125 180.98
18 450 150 * * 7.5 190.5
18 450 300 * * 7.5 190.5
20 500 150 * * 6.25 158.75
20 500 300 * * 8.625 219.08
24 600 150 * * 7 177.8
24 600 300 * * 7.75 196.85
30* 750 150 * * 12 304.8
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.

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