factory built UV disinfection rig in to the new building -
Courtesy of NMCNomenca
built assembly in final location. UV FBA built by Lintott
Control Systems Ltd - Courtesy of NMCNomenca
Papplewick Borehole Pumping Station (BPS) is located near to
Papplewick Village in Nottinghamshire. The site is located
within the boundaries of the original and now historic and
English Heritage protected site. The scheme replaced the
existing outdated and none regulative equipment with a new ultra
violet disinfection plant. The team fulfilled their obligations
ensuring water supply was maintained whilst collaborating with
English Heritage and Papplewick Heritage team who operate the
site. To reduce the impact of the works on site, the new
filtration plant utilised Design for Manufacture and Assembly.
The new building was located between two live water mains and
positioned to maintain the visual historic importance of the site.
A single mains isolation enabled the necessary connections in
coordination with Severn Trent Water (STW) Networks.
The existing modern day
water site has two main buildings; one that contains booster
pumps and control panels and a second which houses chlorine
dosing systems and the existing UV disinfection plant. The
existing UV is nearing the end of its service life which is
putting the site at risk of not supplying drinking water to the
correct levels of cleanliness.
This plant is therefore
to be replaced under this project and once the new UV plant has
passed its trials into supply, the old one would be dismantled
and removed. Both existing buildings are masked by trees as per
the adjacent photo and the other lowered behind an old cooling
water pond. The site is licensed up to 10.7MLD and assists in
supplying north Nottinghamshire with potable water.
Area of trees before the new UV building was built -
Courtesy of NMCNomenca
The proposed solution
from Severn Trent Water utilises a standard design D12 UV FBA
(factory built assembly) UV plant built by Lintott Control
Systems Ltd; a designated framework supplier.
The project team
identified the optimum location on the historic site to have
minimal visual impact whilst ensuring full treatment prior to
distribution into supply. The options considered included:
Put the new UV in place
of the old. Risks included the existing building being too small
and it would mean the entire BPS would have to be turned off for
an extended period of time that would put at risk water supply
in the area if the alternative supplies were to fail.
The UV FBA is supplied in
a high security rated GRP kiosk. This was put forward in
planning with tree screen protection around it to reduce visual
impact but it was rejected by the English and Papplewick
Heritage via the Council Planner.
A brick building was
proposed with materials (bricks, slates, guttering) to match the
historic buildings. To reduce the impact it was requested by
English Heritage that it was put sideways, the smallest elevation
being the one seen most.
This however created an
issue because the back of the building would be over the top of
an existing water main that gravity feeds water from the
Papplewick Distribution Service Reservoir (DSR) to the
Papplewick BPS booster pumps. It is not good practice to build
over pipes that have a service life and have the potential to
This main was located and
assessed to review its condition and a section would require
replacement. Isolations were attempted but it was proven to shut
off supply as several properties were direct fed off this main
with no hydrant points to give them back up water even from
tankers. This evidence was presented to English Heritage.
Sideways on brick
building that is not sited over any existing water mains.
Despite the kiosk not being required the UV FBA still came on a
skid fully pre-tested but to be landed with in the brick walls
and roof built after.
FBA in situ - Courtesy of NMCNomenca
The new disinfection
plant comes with a duty/stand-by stream so if one fails the site
can still operate and will maintain potable water. Due to lack
of available land on site in the correct location, for the new
UV to be at the optimal point in the process stream the chlorine
dosing point had to be moved.
The solution for this was
to join together two existing chambers on the water main to
provide space during a single isolation to install the new
inlet/outlet valves that would feed the new UV and a new
chlorine dosing mixer.
Pipework in a newly extended existing chamber ready for
the new UV plants in and outlets - Courtesy of
Pipework made above
ground before installation to check measurements and
reduce tasks in a limited water network shutdown -
Courtesy of NMCNomenca
disinfection plant: The UV disinfection plant is fully
built and tested off site then delivered to site and assembled
using a contract lift. This significantly reduced build time on
site, reduced risk to work force and reduction in cost of
underground pipework: Pipework that is sited under the
new UV plant was built in single sections off site and
pre-pressure tested. This reduces time of installation and risk
of any leaks in the pipe or failed joints during on-site
Sections of main
that were to replace the existing were built above ground and
were pre-pressure tested, measured and checked against existing:
Sections of main that were to be replaced with a new valving
arrangement, static mixer and T-pieces, were built above ground,
pressure tested, double checked for measurements prior to
committing to a mains isolation preventing a risk to supply.
In a single day the
UV FBA was assembled on site and precast roof beams landed to
make the building weather tight and secure: The
buildings walls were built to full height and the UV FBA was
delivered and landed in between. Once the FBA was in place the
precast roof beam was installed using the same crane.
The following steps below
Building formed with
Road closure to lift FBA
over the historic narrow protected entrance gate to the site.
Set the crane up in
location 2 and lift the UV FBA in to the building.
Bolt the UV FBA to the
Lift roof slabs Into
place and make the building weather tight and secure.
building ready for the UV FBA delivery - Courtesy of
closure and delivery of the UV FBA by Quinto Crane and
Plant - Courtesy of NMCNomenca
3D scans of existing site
with BIM 3D design to produce an interactive design: 3D laser
scans of the existing site layout were undertaken so that the
new 3D design could be overlaid providing a full visual virtual
This enabled NMCNomenca
to provide models to the client and English Heritage to walk
through the scheme. The 3D drawings also provided the site team
with material call off schedules improving the accuracy of
procurement and the efficiency of the site team.
Use of existing
electrical field wiring to power and control the new UV plant:
Existing power and control cabling was utilised to power the new
UV system. The site has all direct buried cabling approximately
150m to the main power control panel building.
To reduce the amount of
excavation, program, cost, material to land fill and excavating
on top of an existing service route, existing cabling was
re-tested proven compliant and used to power the new UV plant.
Updated testing certificates were provided. This saved
approximately two weeks, £10,000 in labour, plant and materials
and 20 tonnes of tarmac/concrete that would have had to be sent
FBA being lifted in to the Papplewick heritage site via
the old Station managers house
Courtesy of NMC Nomenca
No lost time incidents
during any phases of the scheme.
No pollution events
No customer complaints.
No complaints from
Papplewick Heritage team including hosted weddings, weekend and
steaming events and school tours. The works was established to
cause minimal visual and sound effects.
All electrical and
pipework isolations took place with no incidents and were
complete within the allowed time in the risk and contingency
plan to the network of water supply.
Several isolations that
were booked in were cancelled close to or on the day due to
issues in the network with high water demand or bursts. These
events had to be well managed to reduce cost and program impact.
management ensured all road closures were planned and
communicated with any detriment to the operation of the
treatment plant and Papplewick Heritage site.
participants and information
Severn Trent Water PLC
Lintott Control Systems
Summer 2016 - Spring 2017
Value Target Price
and publishers would like to thank Jamie Hurst, Project
Manager, Non-Infra Clean, with North Midland Construction
PLC - NMCNomenca, for providing the above article for