PUMPS AND PUMPING SYSTEMS
of the station’s pumps had channel type
“Since the RPC_2000
be operated to lower levels, thus removing
impellers, but in an attempt to alleviate the settlement each and every time the pump is
frequent blockage problems, two of the came online the number of stopped. This preserves the cleanliness of the
channel types were replaced with better solid-
pump blockages and the
wet well. The duty pump stop level is now 0.4m,
handling pumps that are proven to be less around the centre line of the pump volute.
prone to blockage. However, this type of pump resultant costly call-outs Retroflo’s Research and Development
is less efficient than the channel types,
have been vastly reduced”
Centre is continually reviewing and updating
resulting in much higher energy costs for the the technology driving the Retroflo system.
station. With the installation of the RPC_2000 Part of the current development work is a
the system was able to identify and eliminate settlement dilution ratios and to achieve rising feature that will benchmark efficiency and
pump blockage issues, allowing the more main self cleansing velocities. automatically select duty criteria based on
efficient channel type pumps to be used. The previous duty stop level of 1.4m did not these efficiencies. The added benefit of this
Prior to the installation the regular pump allow the pumps to empty the wet well, feature will be further optimisation of the
blockages also led to costly and time promoting the build-up of solids around the station and its power requirements.
consuming call-outs for operations personnel. pump volute and hence increasing the risk of Retroflo’s RPC_2000 Retroflo system is at
Since the RPC_2000 came online the number pump blockages. The reason for the high duty the vanguard of improving the water industry’s
of pump blockages and the resultant costly stop level was to prevent solids being drawn into carbon management, and with interest from
call-outs have been vastly reduced. This, the pump inlet, hence causing pump blockages. as far afield as the US, Brazil and Australia the
combined with the operation of the more The RPC_2000’s Pre-Blockage Detection feature future is clear for a British innovation with
efficient pumps, has led to a substantial gives operators confidence that the pumps can global potential. ■■■
reduction in OPEX costs at Ilsham Valley
pumping station.
Cleaner wells
The build-up of solids around the pump
volute increases the risk of pump blockages
and is a common problem at pumping
stations. RPC_2000’s Intelligent Flushing Cycle
uses historical operating data to predict the
incoming flow rate, allowing the well to fill to
a pre-set level before initiating a rapid well-
emptying sequence. The benefits of this
Since 1933, Gorman-Rupp has
approach are twofold: dilution of settled solids
defined growth for the pump
in the well; and the rapid emptying of the
industry as an innovator and
well, ensuring self-cleansing velocities are
leader. We design and manufacture
generated in the rising main.
pumps to exacting standards. Our
passion for pumps and rigorous
“Through continuous
manufacturing techniques mean
dynamic monitoring of the
that Gorman-Rupp pumps are the
best performing and most durable
pump characteristics the
in the industry. It’s been that way
system is able to optimise
for 75 years.
the performance of any
given pumping station”
Visit GRpumps.com for more
information on the pumps
At Scottish Water’s Charlette Street pumping
that are shaping the industry.
station the RPC_2000 performs this function
on a daily basis. At a set time, a system-wide
check is performed to determine whether
conditions are appropriate to enter a flushing
cycle – should the station be in storm
conditions or experiencing high inflow the
system will override the flushing cycle. If the
conditions are acceptable, the well is allowed to
fill to a level higher (2m) than normal operating
The Gorman-Rupp Company g51 P.O. Box 1217 g51 Mansfield, Ohio 44901-1217 g51 USA
levels. The pumps are then operated to rapidly Phone: 1.419.755.1352 g51 Fax: 1.419.755.1266 g51 email: intsales@gormanrupp.com
empty the well to a low level. The benefits of
GRpumps.com
this process are to scour the wet well to
F-457 © Copyright, The Gorman-Rupp Company, 2009 Gorman-Rupp – Mansfield Division is an ISO 9001 Registered Company
remove settlement while achieving appropriate
November 2009 Water & Wastewater Treatment 35
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