Benoil Services Ltd

8.0.3 Burst Disc Assemblies: Design Types

Discs may be simple, no more than a shaped piece of metal foil, or of various degrees of complexity. Simple discs usually have re-usable holders, whereas complex ones come as assemblies built into their holders. But while the former are therefore more economical, the latter are more reliable and accurate. Usually, in oilfield applications, the cost of an operation going wrong is huge, when measured correctly to include down-time, lost production and recovery costs, and it is poor economy to save a little but to risk a lot.
Consequently, Benoil does not list and rarely supplies simple discs. Products are usually fully welded assemblies, with the foil welded between two metal rings. There are also fully clamped versions as assemblies, ones which cannot be adjusted by the user from the pre-set arrangement. Discs can be held in place with a secondary mechanism (circlip, external screws) but for most applications are self-threaded for fixing. The chief exceptions are the original cementing darts (see catalogue section 6), which are rubber over-moulded to slide, and not be fixed, in the tubing.
The seating and porting of a burst disc will depend on its application. Benoil will design an assembly to have a metal-metal seal, a carried O-ring seal, a chamfered O-ring seal, or whatever else is appropriate. There tends to be a lot of interaction in the overall design between the space or wall section available for a port, the type of seal, the size and position of any O-ring, and the requirements of burst pressure and orifice size. Benoil tackles the design using SolidWorks CAD to ensure the parameters fit together to meet the need.

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