2. WHAT IS A TTU?
IT IS A FULLY FUNCTIONING WATER TREATMENT WORKS THAT CAN BE TRANSPORTED TO
SITE ON THE BACK OF A LOW LOADER.
3. WHAT IS A TTU?
A TTU contains a Water Treatment Works which is primarily used for removing Colour, Turbidity and
Cryptosporidium from the water, making it safe to drink.
A TTU can produce anything from 2m³ to 220m³ of drinkable water each day.
For greater requirements we can supply a ‘modular build plant’ which is capable of producing up to
1320m³ of water per day. While this plant is not a TTU it is a purpose made building utilising the same
technology and containing skids that carry all of the working components.
A TTU is the complete package for a Nano Filtration plant and offers huge environmental advantages
and cost savings over a conventional ‘on site’ building.
A complete transportable WTW offering a turn key solution that has been designed and developed
through ongoing innovations at Ross-Shire Engineering.
5. PROCESS
A variety of options available for a TTU Design.
there are currently 18 options available depending on the requirements of the site. These options
include, Feed Pumps, Duty/Stand By Strainers, Permeate Tanks, Re-Lift Pumps, etc...
6. DESIGN AND FABRICATION
The TTU’s are designed and fabricated ‘in
house’ and leave our fabrication facility as a
fully commissioned plant.
The TTU Building, Pipework, Cabling, Civil and
Software Design are all carried out and
completed at our Head office in Muir of Ord.
7. DESIGN AND FABRICATION
The TTU Building is designed to withstand the highest wind speeds ever recorded in the British Isles.
attention to this design detail ensures suitability for placement from the Shetland Islands to lands End.
Each building is enclosed in a thermal cladding
which helps maintain the inside temperature at a
steady constant.
The TTU also has high security doors and a
motorised roller door on the Gable End.
The building is designed to allow a crane to lift it
from the lorry bed onto the concrete slab that
the TTU ultimately sits on, whilst fully laden with
all the equipment.
8. DESIGN AND FABRICATION
All of the pipework within the TTU is Stainless Steel and fully welded which negates any risk of leakage
through the joints. It is fully designed within our 3D Design package, Autodesk Inventor, which allows
for full ‘walk through’ design including instrumentation and cabling.
The pipework is routed to allow for clear walkways
throughout the building allowing ease of
maintenance if required. All pipework is fixed
500mm from the floor to allow for cable tray and
cables to be run underneath, without any conflicts.
All pipework is compiled and put onto
drawings for review by the design team and
the pipefitters / welders. This ensures that the
pipework is designed correctly practically and
efficiently.
9. DESIGN AND FABRICATION
The plants are designed with an intelligent MCC that utilises a Siemens PLC with a Profibus network to
communicate with all the pumps, valves and instruments, including pressure, flow and quality
instruments.
Using a ProfiBUS network for control and
automation reduces the amount of cabling
required by 25% and allows the MCC, cable
containment and building to be smaller than with a
conventional control system.
The use of a Intelligent MCC allows the option
of remote control and monitoring, should it be
required.
10. DESIGN AND FABRICATION
All pipework spools are initially put into the 3d Model and arranged to suit each specific site. they are
then put onto separate drawings and sized to allow the pipe fitters and welders to fabricate the spools.
Once produced the spools are pre fitted, cleaned and flushed before final installation within the TTU.
11. DESIGN AND FABRICATION
Once the TTU design, fabrication, pre-Installation is complete the final Install can begin. This work is
carried out by a fully trained team of multi skilled time served men and women working closely together
efficiently and constructively.
Before the final fitment, pipe, pipe
supports, brackets and cable tray is all installed to
ensure fit and quality. Once the pre fit is complete
the job is checked against the design criteria for
each site, once checked it is sent for finishing.
Upon completion of the painting and
galvanizing of the fabricated components they
are placed into the building for final fitment. the
cabling is then completed ready for testing.
12. COMMISIONING
THE COMMISSIONING IS CARRIED OUT IN THREE STAGES, FIRST AN INSTALLATION
INSPECTION IS CARRIED OUT TO ENSURE THE PLANT HAS BEEN CONSTRUCTED AS THE
DESIGN.
Next comes the dry testing, the plant is powered
up and the required settings for pumps, valves
and drives are entered. The profibus network is
also commissioned at this stage.
Once the dry test is complete the wet testing
can begin. This is carried out in our workshop
and the plant is tested with full flows through it.
13. CIVILS
Infrastructure in any contract within the water
industry is essential, it provides the services and
structures for the M & E install process. The
bespoke reinforced concrete base provides a
robust platform which encapsulates the services
penetrations to allow mechanical and electrical
install to take place directly after the TTU has
been placed.
14. TRANSPORTATION
Upon completion of the construction and testing, the TTU embarks on the final stage of its journey, to
site. It is placed onto ‘skates’ and rolled out of the workshop, it is then lifted onto the back of a 40ft Lo-
loader by crane.
Once the TTU has been fully secured it leaves for
site. This part of its journey has involved a great
deal of in-depth logistical planning.
Due to the variety of site locations within
Scotland tending to be served by B Class
roads the logistics route planning and
surveying can in itself be extremely
challenging.
15. TRANSPORTATION
Many sites are on islands or only accessible via ferry, this has to all be planned and programmed into
the journey of the TTU. The Units are designed to conform to the maximum width and height allowed
on UK roads, without a Police escort.
On arrival at site the crane then lifts the TTU onto
a concrete slab that has been constructed to
mirror the detail of the 3d Model.
Once placed onto the slab it is anchored by
Eight M30 holding down bolts pre-cast into
the slab.
16. COMPLETED TTU
After all of the tie-ins have been completed and the remainder of the site work complete the TTU is
then ready to be Fully commissioned and be put into its Test Stage.
17. CURRENT RSE SITES
Ross-Shire Engineering are currently carrying out work
on various sites throughout Scotland. These sites vary
in location, size and build type.
TTU BUILDS
Sheildaig WTW - 150m³ per day
Kinlochewe WTW – 150m³ per day
Loch katrine WTW – 35m³ per day
Stronachlachar WTW – 35m³ per day
Kilchoan WTW – 160m³ per day
Raasay - 200m³ per day
PURPOSE MADE BUILDS
Lochcarron WTW – 520m³ per day
Unst WTW – 520m³ per day
Broadford WTW - 520m³ per day
18. RSE INNOVATIVE DEVELOPMENTS
After winning the ‘SCDI Highlands and Islands Business Excellence Award for Excellence in
Research and Innovation’. Ross-Shire Engineering has not rested on its laurels, and are currently
looking into further developing the design of the TTU to incorporate clear water tanks and chemical
waste tanks. This will remove a vast amount of the civil scope of works and will greatly benefit the
environment, as well as being even more cost effective. incorporating these two tanks into the
building will ensure there is far less disruption to the area within the immediate vicinity of the WTW.
These designs are still in their early stages, but are looking extremely positive and will have a
massive impact on the amount of site work required at WTW sites in the future.
