• Union Enterprise Private Limited

Chemical Process Pumps

The Unipump range chemical process pumps comprise horizontal single stage centrifugal pumps constructed in SS 316 and polypropylene materials. The one-piece self-venting SS 316 volute casing comes with end suction and top centreline delivery branch. The polypropylene volute casing is 3-piece type with full metal back plate support and self-venting, with companion flange end connection. Both SS and polypropylene casings open towards drive end, and allow easy withdrawal of the bearing frame without disturbing the pipe work when using a spacer coupling and no realignment is necessary. The semi open radial impeller is specially designed for low NPSH requirement. It is hydraulically balanced by back vanes. Reliable fixing of impeller on the shaft is ensured by positive locking of impeller nut by means of threaded insert. A single piece heavy-duty shaft in full SS 316 material, is used. All critical surfaces are ground to less than 0.8 micron. Threads where shaft screws into impeller are sealed by Teflon 'O' ring. The shaft sleeve is available with hastelloy, alloy 20, Teflon, SS 316 as per liquid specifications. The shaft sealing is with either packing or mechanical seals in stuffing box. External cooling is provided for longer seal life. The inboard bearing is single row, deep groove; outboard bearing is double row, deep groove angular contact type. The bearings are pressed on shaft and free to float axially in frame, and carry radial load only. Both bearings are for two year minimum life. The bearing frame of sturdy cast iron construction provides rigid bearing alignment and shaft support.