Benoil Services Ltd

6.10. Cement Darts with Burst Discs

Cement darts contain a bursting disc which bursts under given conditions at a pressure which is reliably known in advance. Thus cement may be discharged from coil tubing in a controlled manner. The technique is not limited to cement and may be used for any fluid or fluidised solids, but is most usually used for cementing. Cement darts are based mostly on nickel foils which are not suitable for strong acids - see the Acid Darts section 6.6 - but acid darts are suitable as cement darts. Darts may be adapted in various ways to suit customer operating needs, and often have been.
Materials:  Generally based on nickel foil welded between stainless steel flanges and with a nose and body encapsulated in polyurethane, shaped to provide a seal with the tubing. Some are now based where required on Alloy 600, Alloy C-276 or SS316.
Stock:       We try to keep some of the range of sizes usually in stock. This means the metal cores carrying the disc, not the made up dart. This is not entirely practicable as the ranges have grown. Particularly for the new large sizes for 2 3/8", 2 7/8" and 3 " tubing the cores are not stocked, though for these we keep standard parts from which to make up the desired cores for the required pressure.
Click for Catalogue   Click here   for our Cement Dart listings
    Choosing Your Dart
Dart Cone Tail Shape
Burst Pressures
Temperature
Effect of Temperature on Burst Pressure
Scheme of Part Numbers for CT Darts
Cement Dart Guide

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