SRI-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
Hexagonal head pre-torqued capscrews allow installation and in service re-torquing using standard workshop tools. High quality stainless steel capscrews prevent galling with safety head.
The unique geometry of the safety head ensures concentricity with the pipe optimizing fluid flow in line with certified Kr values
Increased rupture disk seating area allows for high companion flange stud torques compatible with spiral wound type gaskets
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

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Sizes & Pressures
Disks & Sensors
Materials & Option
Accessories
Documentation

Sizes & Pressures

in	mm	ASME / ANSI	EN	JIS	in	mm
Disk Size		Safety Head Flange Rating			Safety Head Flange Thickness
1	25	150/300/600	10/16/25/40	10/16/20/30/40	1.5	38
1.5	40	150/300/600	10/16/25/40	10/16/20/30/40	1.7	43
2	50	150/300/600	10/16/25/40	10/16/20/30/40	1.9	48
3	80	150/300/600	10/16/25/40	16/20/30/40	2.2	55
4	100	150/300*	10/16/25/40	16/20/30/40	2.9	73
6	150	150/300*	10/16/25/40	10/16/20/30	3.6	92
8	200	150/300*	10/16/25/40	16/20/30	3.8	95

* Available for ANSI 600# with adapter ring. Consult BS&B or your local representative.

Rupture Disks

Sigma & Sigma EXL

SKr

LPS

RLS

S-90

JRS

FRS

FRL

SRD & SRD-L

Sensors

Burst Alert Sensors (BAS+)
Round or Square

Leak Detector Alert Sensors (LDAS+) Round or Square

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.

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.