Fibreglass (FRP) pressure vessels for media filtration and softening, from 8" x 44" (32.5 L) to 36" x 72". The FlowShell vessels are covered by DWT datasheets: a one-piece HDPE liner inside an epoxy and continuous fibreglass winding, rated 10.5 bar maximum working pressure at 1-50 °C and hydrostatically tested at 15 bar before despatch. Ratings for the two vessels without a datasheet (10" x 35" and 10" x 54" side-loading) are confirmed on quotation. Vessels up to 16" diameter have a 2.5"-8NPSM top opening, with 4"-8UN versions of the 14" and 16"; the 18" and 24" use 4"-8UN openings, and the 30" and 36" have 6" flanged top and bottom connections. The range is completed by 27 mm, 32 mm and 50 mm riser pipes, top and bottom distributors, tank heads, a 4" to 2.5" reducing cap and a 4" bottom plug. Media and control valves are listed separately.
We're still adding our full range and more datasheets. If a part isn't listed, send us the code: we stock and source more than this catalogue shows.
Size the vessel on service flow for the chosen media, not on volume. Each FlowShell datasheet gives the manufacturer's service-flow guidance, from 0.2-0.5 m³/h for the 8" x 44" to 13.2-16.2 m³/h for the 36" x 72". Leave enough freeboard above the settled bed for backwash expansion. Match the vessel opening to the valve base: 2.5"-8NPSM valves fit 2.5" openings and 4"-8UN valves fit 4" openings. Choose the riser to suit the valve socket, 27 mm for valves taking a 1.05" (26.7 mm) riser and 50 mm for 4" valves taking a 1.5" D-GB riser. Fit a vacuum breaker on every vessel, and a pressure-reducing valve wherever supply pressure can exceed 10.5 bar.
Tick lines to compare them side by side or add them to your quote list together.
Fibreglass pressure vessel 8" x 44", 2.5" top opening (32.5 L)
Fibreglass pressure vessel 10" x 35" (38 L)
Fibreglass pressure vessel 10" x 54", 2.5" top opening (62.5 L)
Fibreglass pressure vessel 10" x 54", side loading port (62 L)
Fibreglass pressure vessel 12" x 52", 2.5" top opening (85.3 L)
Fibreglass pressure vessel 13" x 54", 2.5" top opening (102.3 L)
Fibreglass pressure vessel 14" x 65", 2.5" top opening (146.8 L)
Fibreglass pressure vessel 14" x 65", 4" top opening (146.8 L)
Fibreglass pressure vessel 16" x 65", 2.5" top opening (191.7 L)
Fibreglass pressure vessel 16" x 65", 4" top opening (191.7 L)
Fibreglass pressure vessel 18" x 65", 4" top opening (235 L)
Fibreglass pressure vessel 24" x 72", 4" top and bottom openings (460.5 L)
Fibreglass pressure vessel 30" x 72", 6" flanged top and bottom connections (718.9 L)
Fibreglass pressure vessel 36" x 72", 6" flanged top and bottom connections (969.2 L)
Bottom plug 4", threaded, for FRP vessels
Reducing cap 4" to 2.5" for FRP vessels
Vessel head, 2.5" tank thread, 1" port
Vessel head, 2.5" tank thread, 3/4" port
Bottom distributor for 27 mm riser
Bottom distributor for 50 mm riser, 4" vessels
Bottom distributor, high flow, for 27 mm riser
Branched bottom distributor for 50 mm riser, 4" vessels
Riser pipe 27 mm, 1.4 m, for 844, 1054 and 1354 vessels
Riser pipe 27 mm, 1.6 m, for 1465 vessels
Riser pipe 27 mm, 3 m
Riser pipe 32 mm, 3 m
Riser pipe 50 mm, 2 m
Top distributor for 27 mm riser
Top distributor for 50 mm riser, 4" vessels
Top distributor, high flow, 27 mm
Lead times are indicative estimates only, based on typical supply at time of publication, and are confirmed at order acceptance. They show our usual longest sourcing time. We can often supply sooner from our network of local suppliers. Actual times may vary with supplier stock, manufacturing, importation, customs and logistics. Only a written quotation or order confirmation commits DWT to a delivery time.
