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07/06/2010
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A highly integrated manifold concept is offering plant engineers a radically simpler means of installing level measurement instrumentation to process tanks and vessels.
 The approach, which has been developed by the Instrumentation Products Division of Parker Hannifin, involves two single-piece manifolds that integrate all the valves for connecting upper and lower pressure sensing points to a differential pressure transmitter.
What's interesting is that it eliminates a huge amount of weight and size, as well as potential leak paths, compared with conventional hook-ups, fabricated using discrete valves and tubing connections.
Called CCIMS level-flange, its manifolds comprise one for the wet leg pressure connection at the bottom of a tank, and the other for the dry leg pressure sensing point, with a flange connection, block-and-bleed valves and balance line connections.
Parker Hannifin makes the point that the intimate nature of the piping connection aids the performance of the instrument system. It also ensures that the differential pressure instrument is mounted directly adjacent to the process vessel, so helping to avoid the common problem of blockages caused by viscous media, hydrate formation, freezing etc.
Weight and size of the manifolds is also reduced, with a complete assembly, including instrument, extending around 10.4in from the tank – half that of many common approaches.
Just as important, Parker reckons its new plant equipment will reduce installation time and cost of dp transmitter level measurement systems by up to 85%.
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Author
Brian Tinham
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