Brochure

DDHF

Centrifugal Pumps

Overview & Applications

Heavy duty reﬁnery and petrochemical applications

require heavy duty solutions. DDHF pumps are speciﬁcally

designed to handle high pressures, elevated temperatures

and ﬂuids with low speciﬁc gravity, delivering exceptional

performance in extreme environments where pressures

could reach 500 bar and temperatures may hit 450°C.

The design is based on the double casing BB5 pump

design and complies with API 610. The design features

include an internal volute casing and a back-to-back

impeller conﬁguration, simplifying maintenance,

reducing downtime and guaranteeing pump reliability.

These pumps are widely used in reﬁnery and

petrochemical applications such as hydrocracking

processes, reactor feeds, ammonia and urea, as well

as boiler feed service.

Design Features

The outstanding design features of DDHF pumps are:

1) Simplicity of Maintenance:

 •Theoptionalhydraulicmodulepulloutdesign 

permits complete removal of the inner case,

covers, bearings, mechanical seals and coupling.

This is an important feature where minimum

down time is essential or where the job site

environment is contaminated.

A complete hydraulic module can be fully

assembled in a clean workshop and then

transported to the job site and installed.

2) Impellers mounted back-to-back: This arrangement

maintains axial balance without resorting to

complicated balancing devices.

3) Double Volute: The double volute provides radial

balance at all capacities and provides greater throat

area, making the pump less subject to choking or

build up.

4) Nozzle Location: The location of the nozzles is

customizable for ﬂexibility in positioning according

to the application in question.

GE Oil & Gas

Flyer DDHFnew.indd 1 30/09/10 12:13

PAGE 1
GE Oil & Gas DDHF Centrifugal Pumps Overview & Applications Heavy duty refinery and petrochemical applications require heavy duty solutions. DDHF pumps are specifically designed to handle high pressures, elevated temperatures and fluids with low specific gravity, delivering exceptional performance in extreme environments where pressures could reach 500 bar and temperatures may hit 450°C. The design is based on the double casing BB5 pump design and complies with API 610.
PAGE 2
Outer barrel and cover The outer barrel is a cylindrical body, either fabricated or forged, and designed for the required working pressure. To provide for uniform temperature expansion, the barrel is supported by four feet located on the horizontal centerline. To maintain alignment during expansion, a guide pin is located between the lower side of the barrel and the base at the coupling end.