|• One of QED’s largest ever surge vessel rollouts
|• Control system ensures minimum energy consumption
|• Reliable surge control on each installation
|Quantum Engineering Developments (QED) completed
installation in February 2015 of ten surge vessels for Southern Water to
replace eight vessels in the Thanet area of Kent, as well as introducing
units at two new sites.
|The programme of works, which was subcontracted from Morrison
Utility Services, was one of largest undertaken by QED under one
scheme. Installation of the new vessels, which ranged in size from 1m3
to 17.8m3, began in June 2014.
|Four of the sites – Martin Gorse, Dover Road, Deal Low and
Flemmings A – were straightforward installations, with the existing
vessels removed and the new ones lifted in and connected within two
days. Other sites were more complex, requiring Morrison to carry out
civils work to install new plinths, pipework and cabling.
|Lord of the Manor Installation
|At one of the sites, it was more economical to build a new plinth to
host the surge vessel closer to the water main and abandon the existing
one altogether (Figure 1).
|Southern Water’s project manager, Chris Mullender, said:
“Morrison constructed the new plinth in reinforced concrete along
with cable ducts to connect the compressor. Pipework also had to be
installed to feed water from the outgoing main to the surge vessel in its
|QED installed the 9.5m3 surge vessel and isolation valve onto the
plinth and bolted them in place. A new compressor and control panel
was also installed in an adjacent building with all inter connecting
cables and pipework between the associated components.
|The surge vessel was cleaned and sterilized before it was put into
service. The access hatch was then closed and the surge vessel filled with
water, which was then drained to waste.
|As with all surge vessel installations, sterilization was a major part
of the commissioning process. Once the sterilizing solution had been
completely drained and the sampling results proven satisfactory, the
vessel was commissioned into service.
|Trials were carried out successfully with Southern Water’s booster
and borehole pumps running at normal operating speed. They were
also conducted to simulate failure of pumps, to ensure that the surge
vessel successfully protected each pumping main from high and
|Another more complex installation was for two surge vessels
required at Wingham, Prior to the installation, Southern Water needed
to carry out major works for a permanent drinking water main bypass.
|“The enabling works for the bypass took a couple of weeks,” said
Mullender. “We needed an alternative supply for the downstream
village in the long-term to facilitate maintenance of two boreholes in
addition to the surge vessel installation.”
|He continued, “Existing service reservoirs weren’t adequate for the
length of time the works required, so residents could only be taken off
their usual supply when the bypass works were complete and we gave
|“As is often the case with drinking water supply projects, most
of the works had to be to be undertaken outside the summer period
to avoid the time when water demand is at its highest. QED met our
|Dry commissioning on all ten installations is complete and the first
surge vessel, Martin Gorse, is planned to be wet commissioned at the
end of March 2015 with the rest to follow.
|Maintenance of the surge vessels is minimal. A mandatory interior
and exterior certificated inspection of the vessels will be carried out by
Lloyds British every two years.
|QED’s unique QUBE control system provides reliable surge
control on each installation. It also ensures that the compressors are
running on the minimum energy consumption necessary, reducing
carbon footprint and optimising performance to deliver cost-efficient
total capital and operating expenditure.
|Mullender said: “It was a difficult project, given the number of
different sites, but Morrison and QED worked closely with our team
and meeting our requirements and expectations.”