NDh Series Single Stage Radially Split Barrel-Insert
NDMh Series Radially Split Multistage Segmental /
Applications: Designed for handling refined
products at the process plants in the oil-refining industry.
Design: ANDh and ANDMh series pump
units consist of a centrifugal pump and an induction motor in the
explosion-proof version, which are mounted either on a common base
plate (if the nominal power of the motor is less than 400 kW) or on
separate base plates. The pump and motor shafts are connected by
means of a flexible coupling. The pump units shall be rigidly
anchored to the foundation, and piping shall be also rigidly
connected to the pumps.
The pumps as components of the pump units are electrically
driven horizontal, between-bearings, centreline-supported, single-
or multistage segmental or barrel type centrifugal pumps with
hydraulic balancing of rotor axial thrust.
Flanged nozzles are oriented: radially to the top (discharge)
and tangentially horizontally sideways (suction). Counter flanges
have a weld neck.
Upon the Customer’s request, the suction nozzle may be arranged
In order to enable the pump to withstand hot and cold shocks and
thus to allow for free expansion of static components during the
pump operation whilst maintaining coupling alignment, the pump feet
on the drive side are rigidly dowelled to the base plate pedestal
and the other end is pinned so that it should be axially
The pump rotor is carried either by the oil-bath lubricated
antifriction bearings with forced cooling (if the nominal power of
the motor is less than 400 kW), or by the oil-bath lubricated plain
bearings (in case of the nominal motor power within 400 to 630 kW),
or by the pressure lubricated plain bearings with lube oil supplied
by a pressure lubrication installation (if the nominal power of the
motor is over 630 kW).
Shaft sealing is by mechanical seals in tandem arrangement,
which utilizes a pressurized barrier fluid, neutral to handled
medium. Handled medium near the shaft seals is cooled by cooling
liquid supplied into the thermal barrier chambers.
Sense of rotation of pump shaft is shown with a rotation arrow
attached to the pump casing or to the bearing housing on the drive
The motor pump units shall be controlled by a process
monitoring, control, warning/alarm and emergency trip system as
required in PB 09-540-03.