Product category:
Shutdown, SIS and safety systems
News Release from: BS & B Safety Systems | Subject: Sigma EXL
Edited by the Processingtalk Editorial
Team on 28 June 2007
Sigma EXL reverse buckling bursting disk
BS+B has introduced the Sigma EXL reverse buckling bursting disk developed with the highest operating pressure capability available from a bursting disk: see these on show at Offshore Europe 07
With a burst pressure range from 1 barg to 34.5 barg, the Sigma EXL allows operating pressures of up to 100% of its minimum burst pressure or 95% of the marked burst pressure Every Sigma EXL disk performance is validated by pressure testing to its maximum recommended operating pressure
This article was originally published on Processingtalk on 10 Apr 2006 at 8.00am (UK)
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The Sigma EXL disk is installed with the dome towards the process.At the disk burst pressure the disk dome reverses and opens by shearing around a circular score line at edge of the dome area on the downstream side of the disk.
The standard "zero" manufacturing design range Sigma EXL bursting disk is designed for use in gas, liquid or two-phase flow service.
The Sigma bursting disk is also available with a minus 5% manufacturing design range for use when operating conditions allow, at a reduced cost.
Sigma disks are also validated by pressure testing to their maximum recommended operating pressure.
Both bursting disks test data is graphically presented on their Burst Test Certificate.
A curve of the burst pressure distribution that includes in process and final burst test values is shown.
The Sigma EXL and Sigma bursting disks are designed for installation in a SRB-7RS pre-torqued Safety Head disk holder.
This enables upgrades of installations using other bursting disks that have standardised on the SRB-7RS safety head.
The Sigma EXL and Sigma disks use SAF (Structural Apex Forming) technology to achieve a wide range of burst pressures with great accuracy and a Damage-Safety ratio of less than or equal to 1.
This ensures that a damaged disk will burst at or below its marked burst pressure.
Available in sizes from 25 to 200mm (1in to 8in), Sigma EXL and Sigma reverse buckling disks offer a wide range of corrosion resistant materials: nickel, 316SS, Inconel Alloy 600, Monel Alloy 400, Hastelloy Alloy C-276 and Tantalum.
Fluorocarbon film liners supplied on the inlet side of these disks are available for added corrosion resistance.
Each bursting disk features an attached disk tag, which indicates correct orientation in the pressure system and displays disk markings that meet EN ISO 4126-2(pending) and ASME code requirements together with any further information required by the user.
The Sigma EXL and Sigma disks can be supplied in compliance with the ASME code, complete with a "UD" stamp on the attached tag.
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