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‘644S’ Series Filter Vessels

Crall ‘644 S’ series vessels are designed to use 6” x 44” filter cartridges. These vessels are capable of providing flow rates to 1800+ gpm.

The ‘644’ series vessels are designed in accordance with the ASME Boiler and Pressure Vessel Code, Section VIII, Division 1; with the ‘U’ stamp optional. All ‘644 S’ series vessels feature inlet and outlet inline for ease of installation in existing lines.


Design: ASME Section VIII, Div. 1
Design Pressure: 150 psig up to 1440 psig
Design Temperature: Up to 450 degrees F
Materials of Construction
   Vessel: Carbon Steel
   Internals: Carbon Steel
   O-Ring: Buna 'N'
Inlet & Outlet: RF Flange
Exterior Finish: Sand blast & shop enamel
Cover Lift: Mechanical 20” through 28”, Hydraulic 36” and larger


Materials of Construction
   Vessel: 304 or 316 ss (wetted parts only), 304 or 316 ss (complete)
   Internals: 304 or 316 Stainless
   O-Ring: Viton*, Teflon* encapsulated silicone, neoprene, others on special request
Exterior Finish: Special coatings on request
Interior Finish: Coal tar epoxy
Pressure Gauges: Direct reading differential
Inlet & Outlet: FNPT connections
High Pressure Ratings: Higher pressure ratings are available upon request.

The vessels will accommodate a wide variety of 6” x 44” cartridges.

*A trademark of E.I. Dupont de Nemoures Co.

644S Series filter vessel Download specification sheet PDF.