The VD, VLD line heavy duty process pumps, available in
double-casing or wet pit configurations, are vertical single or two
stages double volute/diffuser type.
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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.
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 10.
Pump shaft in one or at the maximum two pieces, fully machined to
respect the more restrictive run-out API limits.
Air fan or water 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 casing and
column.
Technical data
Capacities: up to 2200 m3/h (10000 USgpm)
Heads: up to 500 m (1600 feet)
Temperatures: from -150°C (-240°F) to 400°C (750°F)
Design working pressure: up to 60 barg (900 Psig)
Rotational speed: up to 2000 rpm
Design options
Additional rigid coupling to facilitate mechanical seal
maintenance activities.
Enclosed lineshaft construction to protect shaft.
Inside drain line.
Axial thrust tilting pad bearings for ultra high thrust operating
condition.
Anti reverse rotation device.
Special bearing isolators at either bearing housing ends.
Oil mist lubrication ( pure or purge ).
Temperature and/or vibration detection and monitoring
equipment.
