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Support for tubesheets in hollow fiber permeators
| Details |
Inventors: Clark, George B.;
Assignee: The Dow Chemical Company (Midland, MI)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
Foraminous plates formed from coiled or parallel tape lengths may be inserted between the tubesheet and a ported casing-end in a hollow-fiber type permeator, to convey effluent from the fiber lumens to the port and to support the tubesheet against the pressure differential between its inner and outer faces. The face of the support plate which the tubesheet will bear against is defined by edges of the tapes, which are held radially or laterally apart by spacing means adapted to permit effluent flow through the plate between the tapes. Either the casing-end or the plate surface bearing against it is grooved. |
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DETAILED DESCRIPTION Plates suitable for use as tubesheet supports according to the present invention may be fabricated by rolling up or stacking non-nesting sheets, bonding--if essential to cutting or if desired--and then cutting.
Preferably, however, the plates are made by rolling up together a tape and an elongate, flexible spacing means which may be--or advantageously is--a second tape (which will not nest with the first).
Wound tape supports are most conveniently made by continuous winding on a rotating mandrel (which may be quite small in diameter, depending on the flexibility of the tape) and, with the aid of suitable guide flanges, will assume essentially the cross-sectional shape of the mandrel employed.
If the plate is to be formed from a single tape, the tape must be shaped in some manner, such as by random denting, irregular "crinkling" or by gluing particles on it, so that only discontinuous contact between successive layers in the roll will result.
Otherwise, the completed roll will not include the between-wrap spaces essential to effluent transport.
The tapes or sheets employed in fabricating the support plates of the invention may be formed from virtually any type of material otherwise suitable in prolonged contact with the type of effluent to be produced in the permeator.
Thus, plastics, metals, ceramics or paper impregnated with a resin (and cured) may be used.
All of these materials, even including such inert plastics as TEFLON (registered trade name of E.
I.
duPont), may be bonded by known techniques.
Where a greater strength to weight ratio is desired, the plate may be formed of a curable thermoplastic and then cured.
Bonding may be accomplished as part of the curing operation.
It is essential that twisting or radial (lateral) displacement of each tape wrap be resisted by the other tape wraps and/or restraining means, such as centrally and peripherally disposed rings, etc.
This in turn necessitates frequent contact between the tape and the spacing means, along the length of the tape
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Nonmetallic Processes 
