The VBN, VBN-DS line heavy duty process pumps, available in double-casing or wet pit configurations, are vertical multistage, diffuser type.
Pump components geometry, optimised through hydraulic, structural, thermal and dynamic F.E.M. analysis, lead to an high product reliability. Particularly to avoid seizures correlated to dangerous resonances, the F.E.M. dynamic analysis is carried out on all manufactured pumps taking into account the proper site operating conditions.
Closed type impeller with front and rear wear rings as well as balancing holes, to minimise the axial thrust.
Large eye single suction or double suction 1st. stage impeller to meet low NPSH requirements.
Deep stuffing boxes, designed in accordance to API 682 Std., suitable to accept any type of mechanical or packing seal.
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 1 to 14.
Pump shaft in one or at the maximum two pieces, fully machined to respect the more restrictive run-out API limits.
Air fan cooling system provided on bearing bracket.
As a standard, the rotor axial thrust is supported by a duplex oil lubricated ball angular contact type bearings.
Renewable bushings are provided at all interstage casings and columns.