Benoil Services Ltd

8.4. Notes on Burst Discs - 5mm bore style

There are now 3 thread options, 2 drive styles, high pressure versions, length and material variations.
To accommodate all these, some revision of part numbers and sections has been appropriate. The new numbers are listed together with the old for reference. At the same time, some uncalled for parts have been de-listed.
The part number now gives the disc pressure rating, a significant improvement which brings them into line with our discs of 1" and above. It also permits a wider range of intermediate values to be listed when necessary. The last three digits indicate the pressure rating. The digits are the same as the first three of the pressure rating, so that, for values up to 9990psi, pressure is indicated in steps of 10psi if required. For pressures above 10,000psi, this means intervals of 100psi. The lists which follow, however, are confined mostly to the commonly required 500psi steps.
Threads: Available as UN; BSP, NPT or other on request.
Bore nominal 5mm; OD11mm; thickness 10mm; thread 7/16-20-UNF; no chamfer; metal-metal seal. These are the originals, now renumbered p/n 18xxxx.
Similar with thread 1/4"BSP; OD 13mm; thickness 10mm ;chamfered to seat on o-ring BS.010.V175. De-listed as never called for but could be supplied as specials.
Similar with thread 1/4"NPT; no chamfer thread seal. De-listed as very rarely called for but can be supplied as specials.
Drives: Available with cross-cut or hex fitting.
8.4.1. Driven by cross-cut with special fitting tool or torque tool.
Standard with cross-cut; p/n 180xxx, 181xxx, 182xxx, 183xxx
8.4.3. Driven by hex slot with Allen key or torque tool.
Standard with hex; p/n 190xxx, 191xxx, 192xxx, 193xxx
High Pressure: At 10kpsi and above, pressure regulations require higher safety standards and equipment. Previously we had a short list of one type. These are now renumbered to enable an expanded list of intermediate values in both cross-cut and hex drive forms.
8.4.2. High pressure with cross cut; p/n 186xxx, 188xxx.
8.4.4. High pressure with hex drive; p/n 196xxx, 198xxx.
Length: Some of these have specially shortened forms as customer specials, p/n 7xxxxx.
Material: We indicate 4 material options (nickel, alloy 600, ss316, and alloy C-276) but this is not necessarily exclusive. Discs have been made in each, but the generally stocked items are the 600 and C-276 forms.
They are listed as sub-sections; thus 8.4.1.1. is Nickel p/n 180xxx, 8.4.1.2. is Alloy 600 p/n 181xxx etc.
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