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General
Handling and Storage Instructions Please
click here to download brochure.
- The Downstream Defender ® internal components
are manufactured utilising highly durable co-polymer polypropylene.
Improper handling can result in damage to the components
and the precast concrete chamber. Failure to comply with
the handling, storage and installation instructions voids
warranties.
- Upon delivery of the Downstream Defender® components,
inspect immediately for delivery damage. If any discrepancies
or product problems are found notify the supplier prior
to unloading to initiate
corrective action. Unloading of a damaged unit without notifying the supplier
voids all warranties and releases liability of costs of repair or replacement
from Hydro International or CPM Group.
- At all times during unloading and installation, avoid
any unnecessary and extreme impacts to the units. Do not
allow components to be dropped, rolled or pushed. All components
shall be lifted and transported using the designated lifting
points where supplied giving firm and complete support
to the unit. At no time shall anyone step, stand or otherwise
place unnecessary load on the components.
- The Downstream Defender ® shall be installed as
soon as possible. Pending installation any loose components
including universal head-links, sealant or seals shall
be temporarily stored in an area protected from dirt and
impact.
General Installation Instructions
- The chamber excavation shall be properly prepared in advance
so that the unit may be installed as soon as practical upon
delivery. The chamber excavation shall meet all minimum
Health and Safety standards for construction.
- The area of excavation should be carefully checked for
services to at least 800 mm greater than the external diameter
of the chamber (see information Table Page 9) and any service
should be excluded from the area.
- A sub-base of compacted stone or concrete (depending on
site conditions) must be level and at the correct elevation
prior to placing the Downstream Defender® concrete chamber
in to the excavation.
- There are three lifting arrangements for the Downstream
Defender® depending on size range.
· The Cover slab requires a three-legged chain (to
be supplied by the customer).
· The 2 m to 3 m unit requires the use of a spreader
beam (spreader beam is supplied by CPM Group).
· The 1000 to 1800 mm unit uses a pair of universal
head-links which hook under the head of the cast-in lifting
anchor into; these are located opposite each other on the
outside surface of the unit. (two-legged chain is required
to be supplied by the customer).
Details of how to engage the universal head-links are shown
below.
- The inlet/outlet connection arrangements are different
on each size range, therefore please contact the supplier
for up to date advice.
1000 mm and 1200 mm single piece Installation Instructions
- Offload the ready to install precast concrete chamber
containing the Downstream Defender® and install in the
prepared excavation.
- Ensure the inlet and outlet stub pipes are correctly orientated
and the unit has been checked for line and level.
- Make sure all internal equipment is in place and no tools
or loose items have been left in unit.
- Place the Butyl sealant around the top surface of chamber
before installing the cover slab. The orientation of the
access is across the flow, as shown in the 2000 mm installation
section.
- The unit can now be carefully back filled with suitable
material.
- The inlet/outlet pipes can now be push fitted into place.
- Setting-to-work – Fill the chamber with clean water
until the discharge from the outlet commences.
1470 mm and 1800 mm two piece unit Installation Instructions
- These units are delivered to site in two main components,
the sump base chamber which is 1.25 m high and the main
top chamber which contains the benching skirt and the vortex.
- Install the sump base chamber into the prepared excavation
ensuring to check line and level.
The above shows the starting and the finishing position
of the seal.
- Ensure the sealing ring is in the correct position as
shown in above diagram. The inner surface of the steel band
and the seal must be coated with a jointing lubricant (not
supplied by CMP Group) before jointing commences.
- Carefully lower and guide the main top chamber onto the
sump base. Ensure the inlet and outlet stub pipes are correctly
orientated.
- Make sure all the internal equipment is in place and
no tools or loose items have been left in the unit before
the cover slab is put in place.
- Place the Butyl sealant around the top surface of chamber
before installing the cover slab. The orientation of the
access is across the flow, as shown in the 2000 mm section
- The unit can now be carefully back filled with suitable
material.
- The inlet/outlet stub pipes can now be connected with
the use of a band seal coupling (not supplied by CPM Group).
- Setting-to-work – Fill the chamber with clean water
until the discharge from the outlet commences.
2000 mm two piece unit Installation Instructions
- The 2000 mm unit is delivered to site in two main components,
the sump chamber which is 1m in height and the main chamber
which has the vortex and benching skirt pre-fitted (effective
height 2.75 m). Note: The stub pipes are not fitted on this
size of unit, please contact your supplier for up to date
connection advice on the inlet/outlet arrangements.
- Install the bottom sump into the prepared excavation
ensuring to check line and level. The unit has alignment
marks along the direction of the flow to aid installation.
- Screw in the four locating nuts and ensure the sealing
ring is in the correct position as shown below.
- Carefully lower and guide the main top chamber onto the
sump chamber and the four locating nuts. Ensure the inlet
and outlet holes are correctly orientated. Check for line
and level.
- Make sure all the internal equipment is in place and
no tools or loose items have been left in the unit before
the cover slab is put in place.
- Place the Butyl sealant around the top surface of chamber
before installing the cover slab. The orientation of the
access is across the flow as shown below.
- Setting –to-work – Fill the chamber with
clean water until the discharge from the outlet commences.
2550 mm and 3000 mm four piece units Installation
Instructions
- The 2550 mm and 3000 mm units are delivered to site in
four main components. The base sump chamber, the middle
section which contains the benching skirt, the top section
which has the inlet/outlet holes and the main vortex which
is delivered in a carrying cradle as shown below. Note:
The stub pipes are not fitted on these sizes, please contact
your supplier for up to date connection advice on the inlet/outlet
arrangements.
- Install the bottom sump into the prepared excavation
ensuring to check line and level. The unit has alignment
marks along the direction of the flow to aid installation.
- Screw the four locating nuts and ensure the sealing ring
is in the correct position as shown in the 2000 mm installation.
- Carefully lower and guide the middle chamber onto the
base sump chamber and the four locating nuts. There are
alignment marks on the unit to aid installation.
- Follow the same procedure for the top section ensuring
the inlet and outlet holes are correctly orientated. Check
for line and level.
- Unscrew the securing bolts from the carrying cradle to
release the main vortex, and carefully lift the vortex out
of the cradle. Carefully lower the vortex into the chamber
section ensuring the correct orientation of the inlet/outlet
holes, there are 10 cut-outs located in the top inside surface
of the chamber that the vortex sits into.
- Place the sealing strip around the top of the chamber,
placing centrally over the gap between the concrete and
the vortex. Make sure all the internal equipment is in place
and no tools or loose items have been left in the unit before
the cover slab is put in place. The cover slab can now be
installed, orientation as in the 2000 mm instructions.
8. Setting-to-work – Fill the chamber with clean water
until the discharge from the outlet commences.
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