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Novel Split-Seal Design Gives Process Vessels A New Lease Of Life

01 December 2002

Flowserve developed its new MSS series split-seal for process equipment
such as mixers, reactors and other containment vessels, which have a
shaft entry for agitators and other internal moving parts. It is
particularly useful when retrofitting older equipment that may have
severe shaft wobble and run-out eccentricities, or when replacing
compression packing with a mechanical shaft seal.

The MSS is designed to ensure that only non-metallic parts are in contact
with the process fluids or gases, thus avoiding any unwanted chemical
reactions. The seal faces are self-lubricating, with good heat
dissipation properties, so there is no need for costly and
maintenance-intensive buffer fluid systems. And as these seals also
withstand pressure reversals, product contamination due to the vacuum
that develops when vessels are emptied or drawn down, is avoided.

Flowserve says one of its MSS split seals can be installed in less than
an hour, even where access may be difficult. Cumulative shaft run-out,
eccentricity and deflections of up to 0.150in TIR can be accommodated by
the unit, which is available in a range of common sizes between 25mm and
305mm (1in and 12in) diameter, as well as non-standard metric and
imperial shafts. Operating pressure ranges are full vacuum to 5bar (dry
running) and full vacuum to 7bar (wet running), at temperatures up to

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