Brochure

Design features

1. Centerline mounting of barrel to increase tolerance

to thermal expansion

2. Inlet channel shaped to optimize ﬂow uniformity and reduce

net positive suction head (NPSH) required

3. Lifting lugs and many other design features to facilitate

assembly and handling of components

4. Impellers with double keys and shrink-ﬁt by induction heating

to minimize residual unbalance

5. Cover held in place by shear rings to minimize assembly/

disassembly time. This feature is available for all frame sizes

6. Bearings with forced lubrication; all frames ﬁtted with proximity

probes and RTDs

7. Balancing drum shrunk on shaft by induction heating to

minimize residual unbalance; swirl brakes for enhanced rotor

stability even when operating with late-lifecycle worn condition

8. Hard coating on all wear surfaces of stage seals

and balancing drum

9. Precision-casted impellers and diffusers maximize

performance predictability and hydraulic radial load balance;

optional ﬁrst-stage impeller with reduced NPSH

10. Rotor designed for operation below its ﬁrst critical speed to

increase reliability and life of seals; stepped shaft facilitates

mounting of impellers

11. Mechanical seal chamber compliant with API682/ISO21049 to

accommodate the engineered seal cartridges

Improved design

for water injection

High-pressure diffuser barrel

multistage pump DDHM

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