Pump components geometry optimised through hydraulic, structural, thermal and dynamic F.E.M. analysis lead to an high product reliability.
Ample balancing line from 2nd. stage to suction maintain stuffing box pressures within limits easily acceptable by any type of balanced mechanical seals.
Centerline casing mounting for high temperature stability.
Rotor operates away its critical speeds.
Deep stuffing boxes designed in accordance to API 682 Std., suitable to accept any type of mechanical or packing seals.
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.
Double suction 1st. stage impeller, balanced by means of back wear ring on the 2nd stage impeller.
Suction and discharge nozzles, integrally cast with the casing, are normally arranged in top-top position, but side-top or side-side nozzle arrangements are available.
‘CARB’ or hydrodynamic line bearing for high temperature application.
Three bearings arrangements available:
Ball Radial / Ball Thrust
Sleeve Radial / Ball Thrust
Sleeve Radial / Tilting Pads Thrust (Kingsbury Type).

Technical data

Capacities: up to 1800 m3/h (8000 USgpm)
Heads: up to 760 m (2500 feet)
Temperatures: from -30°C (-20°F) to 455°C (850°F)
Design working pressure: up to 150 barg (2200 Psig)
Rotational speed: up to 3800 rpm

Design options

For extremely low NPSH duties, a number of DDH pumps can be equipped with inducers.
Steam jacketed casing for special applications.
Replaceable stuffing box cooling or heating jackets.
Double shaft extension.
Cylindrical fit at coupling shaft end.
Special bearing isolators at either bearing housing ends.
Oil mist lubrication system (pure or purge).
Forced feed lubrication system.
Temperature and/or vibration detection and monitoring equipment.
Baseplate available with three point gimbal mounting (FPSO services).