Page 83 - Industrial Plant 2015

Fig. 3 – Low flow-high
head vertical sump
pump (PEP pump)

pump is engineered to suit customer’s specifications,
application and needs. Any pump length from 0.5
to 6.5 m below the mounting plate can be achieved.
Standard construction features a single piece shaft
guided by sleeve type line bearings, where needed.
The span between line bearings, which are available
in different materials depending on pumped fluid
and operating conditions, is studied for each
application in order to assure reliable and smooth
operation, paying special attention to lateral critical
speed issues.
Lubrication of the line bearings is normally obtained by
means of the same pumped fluid or from an external
lubricating source (clear liquid or grease) in abrasive
services available in different materials depending on
pumped fluid and operating conditions. The mounting
plate, which is integral part of the pump, can be
designed in either square or round shape, to match
sump or tank plates or flanges.

Shuqaiq The result is a robust, maintenance-friendly pump for Fig. 4 – Heavy duty
extreme service conditions: from less than 1 to process pump
• 4 V-PEP VS4 API 610 low flow-high head vertical 25 m3/h, up to 300 m head, with casing pressures of
sump pumps (figure 3) 50 bar and over, at temperatures up to 400 °C and with
any type of hazardous and flammable fluids. Open
The PEP pump range has been specifically designed to impeller design and generous clearances allow
meet low flow, high head, low NPSHa API 610 moderate solid contents in the process fluid and
requirements without requiring increased speed surface coating if required.
solutions. Hydraulic working principles are the same
described in the literature for “Partial Emission” or • 16 C2PO BB1 API 610 axially split pumps (figure
“Barske type” pumps, i.e. open impeller with full radial 4)
vanes and 90° exit angle, concentric volute, the energy
being transferred to the liquid in a forced vortex regime C2PO heavy duty process pumps are horizontal,
between bearings, axially split casing, double
The peculiarity of PEP range is that the suction, one stage impeller (BB1 configuration), in
required output velocity is obtained by full compliance with API 610 std., latest edition (ISO
increased impeller diameter instead of 13709). The specific pump construction allows to
increased rotating speed. Low rotating achieve very high efficiency with low NPSHr values.
speed grants low NPSHr values all over Robust casing, stiff shaft design and different
the operating range: in all PEP pumps, bearing arrangements to meet specific applications
NPSHr remains less than 1 m at 3000 make the C2PO a fully reliable pump, granting long
life in service and reduced maintenance costs.
rpm without the use of inducers. Thanks to its specific construction, inner parts are
easily accessible, without disconnecting the casing
and converted into pressure in a diverging diffuser. from the piping and the electric motor.
The peculiarity of PEP range is that the required output The pumps have been delivered to the Jeddah South
velocity is obtained by increased impeller diameter plant site in 2014 and are expected to be installed
instead of increased rotating speed. Low rotating sometime in 2016 and go into operation when the
speed grants low NPSHr values all over the operating
range: in all PEP pumps, NPSHr remains less than 1 m
at 3000 rpm without the use of inducers.

Industrial Plants - May 2015

81