High pressure multi-stage impeller pump WEIR Oil Gas

Heavy duty process multistage pumps, axially split, diffuser type with single or double entry 1st stage impeller.

Pump components geometry optimised through hydraulic, structural, thermal and dynamic F.E.M. analysis lead to an high product reliability. The "modular design" philosophy permits to cover a wide range of applications replacing the main hydraulic components i.e. only impeller/diffuser. Casing, shaft, mechanical seals, bearing frames result therefore fully interchangeable and reusable. Opposed impeller and diffuser configuration to minimise axial and radial hydraulic thrusts.
Large eye single suction or double suction 1st stage impeller to meet low NPSH requirements.
Hydraulic performances checked on a Single Stage Test Equipment. This is particularly useful to verify the effective 1st stage NPSH.
Easy internal inspectability and maintenance.
Central and lateral balancing drums adequately shaped to optimise pump rotordynamic behaviour.
Near centerline casing mounting for high temperature stability.
Deep stuffing boxes, designed in accordance to API 682 Std., suitable to accept any type of mechanical or packing seals.
Axial split bearing housing for easy inspection and maintenance procedure.
Labyrinths and deflectors at either bearing housing to maximise protection against dirt.
A wide range of sizes and material combinations complete the variety of the offered product.
Main design features
Fully designed according to latest edition of API 610 Std.
Number of stages rangeable from 4 to 13.
Rotor operates away it's critical speeds.
Side-Side suction and discharge nozzles integrally cast on lower casing half.
Contoured grafoil or glassfiber gasket to assure joint between casing halves and eliminate interstage leakages.
A wide range of sizes, number of stages and material combinations complete the variety of the offered product.
Casing guidekeys for high temperature application; over 120°C (250°F).
'CARB' or hydrodynamic line bearing for high temperature application.Three bearings arrangements available:
Ball Radial / Ball Thrust
Sleeve Radial / Ball Thrust