Hynds Concrete
Water Tanks
Scan for more
information
Technical Guide R1.6
2016 | RURAL | R1.6 Hynds Water Tanks
Hynds concrete water tanks provide the reliable storage of cool, clear and safe
drinking water in rural areas.
Applications
Product Attributes
Approvals
Above and below ground installation
Cool water storage
Manufactured using fibre reinforced ready
Rural / lifestyle residential houses
Stable pH
Commercial application
Above and below ground option
Resilient against damaging environmental
mix concrete to NZS 3109:1997
Tanks are designed to NZS 3101:2006
Loading requirements of NZS 3106:1986
factors including stock, pests, fire and rust
Reduced potential of algae growth
Quality
ISO 9001:2008
The go to organisation for civil
and rural water product solutions
Hynds concrete water tanks offer a long and virtually
maintenance free service life. Hynds tanks are strong
and durable.
Tanks Specifications and Capacities
■■
■■
■■
■■
R1.6 Hynds Water Tanks | RURAL | PG 2
■■
Above ground water tanks are designed to be either
free standing above the ground or partially buried
300 - 500 mm from underside of tank.
Fully buried (flat top) tanks are designed to be buried with
a maximum of 300 mm of earth cover.
Tank capacity is 22,700 litres (5,000 gallons).
Other than the earth cover, buried water tanks cannot be
driven on, or take any external loading, live or static within
a distance of 3.2 metres to the nearest edge of the tank.
No traffic loading
Load requirements
Tank Venting
An insect proof vent is installed in the centre of the tank lid.
Vent airflow ensures that neither a vacuum or excess air
pressure will develop in the tank. Pumping water from the
tank requires air to replace the water and water entering the
tank requires that air be displaced. A non venting tank will
reduce your pump performance.
Tanks Access
A 600 mm raised manhole access on the top of the lid
ensures that any material that is present on the tank lid
cannot be washed into the tank via access. This access has
a concrete lid that can be bolted shut to give added security.
For correct loading and unloading on to trucks, please refer
to loading instructions (available on request).
Table 1 Tank Dimensions
Product Code
Description
Height
Width
(mm)
(mm)
Ground to
bottom of
invert
Outlet
fitting
Weight
(T)
Capacity
(ltr)
(mm)
SOUTH ISLAND - HORNBY/AMBERLEY
WT5000LDL
Water tank conc Elite 22,730L cw above ground lid
2905
3800
850
50
11.05
22,730
WT5000HDL
Water tank conc Elite 22,730L cw below ground lid
2860
3800
850
50
11.05
22,730
NORTH ISLAND - EAST TAMAKI
WT5000ELT-P
Water tank conc Elite 22,730L cw above ground lid
2928
3870
850
50
9.24
22,730
WT5000ELTFT-P
Water tank conc Elite 22,730L cw below ground lid
2790
3870
850
50
9.24
22,730
Table 2 Concrete Water Tank Accessories
Code
Description
RHCONTV090
Marley Vacuum Kit for Concrete Tanks
RHCI
Marley Calmed Inlet
RHFO
Marley Floating Outtake
WATERLEVEL
Water Level Indicator
WATERLEVEL + EXT
Water Level Indicator Meter Extension
RHMG
Marley Mechanical Water Gauge
Female Tank
Fittings
Male Tank
Fittings
Code
Code
Dia
(mm)
Brass Tank
Fittings
Dia
Code
(mm)
Dia
(mm)
LDF-TFFB
15
LDF-TFMB15
15
BTS20
20
LDF-TFFB
20
LDF-TFMB20
20
BTS25
25
LDF-TFFB
25
LDF-TFMB25
25
BTS32
32
LDF-TFFB
32
LDF-TFMB32
32
BTS40
40
LDF-TFFB
40
LDF-TFMB40
40
BTS50
50
LDF-TFFB
50
LDF-TFMB50
50
Why Concrete Is Better
Concrete tanks provide greater insulation from heat and light and therefore the water temperature is maintained at a more
constant temperature which decreases the growth of bacteria and algae in water storage tanks.
Water Quality
Construction
■■
Excellent pH (medium 7.5)
■■
Non corrosive robust construction
■■
Good insulation for cool water
■■
Brass fittings
■■
45 MPa concrete
Tank Installation
Above ground tanks
Concrete tanks can be either fully or partially buried to
increase the aesthetics of a site.
■■
■■
■■
Tanks must not be installed in such a way that only one
side of the tank is restraining the backfilled earth. In
these situations drain-coil and drainage metal must be
placed directly next to the tank to ensure no hydrostatic
pressure builds up against the tank wall.
■■
■■
■■
Buried tanks should not be backfilled until the water
tightness of all connections is tested.
It is recommended that all tank outlets be fitted with a
shut off valve as close as practical to the tank.
It is recommend that your tank has an overflow outlet and
this is piped well clear of the tank foundations.
A standard tank can be set in the ground to within
500 mm from underside of tank.
■■
Other than the earth cover, buried water tanks cannot be
driven on, or take any external loading, live or static within
a distance of 3.2 metres to the nearest edge of the tank.
Sites with high water tables may require tanks with
flanged boxes to prevent flotation.
Installation
■■
■■
Inlet connections (top):
If a tank is to be fully buried a ‘Flat Top’ tank is required.
These have a flat roof and a support pillar in the centre of
the tank. Flat Top water tanks can only be buried to a
maximum depth of 300 mm below ground level or a
maximum overburden loading of 10 kPa.
■■
Connections
The tank will float if the local groundwater rises over
900 mm from the bottom of the tank.
Buried Tanks
■■
Tanks cannot be placed within 3 metres at a building or
structure and 3 metres from boundary or trafficed area.
Tanks must always be placed on a bed of compacted
sand or fine aggregate of a similar grade, screeded level
to a minimum thickness of 50 mm to a maximum of 150
mm. The base should be approximately 1 metre greater in
diameter than the tank to ensure a consistent transferring
of the tank weight to the ground.
Multiple tanks are to have at least 1500 mm distance
between them. No bushes, tree, or power lines are to
pass underneath or adjacent to within a minimum of 2
metres of the water tank wall.
■■
2 x 100 mm – located at opposite ends.
Outlet connections:
■■
2 x 50 mm – located at same end.
Note:
One connection is capped and the second threaded male connection is
bare. This is bare for fitting of the shut-off valve.
See your plumber for connection information.
Tank Filling
A new above ground water tank should never be filled
completely to the top in one step as this may cause
stress cracks.
The recommended procedure is:
■■
Fill approximately one quarter.
■■
Leave for two days.
■■
Fill another quarter.
■■
Leave for another two days.
■■
Continue process until tank is filled.
This allows the reinforcing in the tank walls to expand
gradually. Partially and buried tanks should be filled in two
steps similar to the above ground tank.
Unconnected or used tanks should not be left empty.
There should be 300 mm of water left in the bottom of the
tank at all times.
R1.6 Hynds Water Tanks | RURAL | PG 3
■■
For partially buried tanks, the area surrounding the tank
must be free draining.
■■
Installation Guidelines
Site Access
■■
■■
■■
■■
■■
■■
R1.6 Hynds Water Tanks | RURAL | PG 4
■■
■■
■■
■■
Site Clearance Requirements
Access to the site must have adequate width clearance
to allow the truck unrestricted height and turning entry to
the site. Weight of truck and tank can be up to 22 tonnes.
The site must be level and free from any obstructions
such as large rocks.
The site foundation must be completely solid so as to
disperse the truck weight evenly.
Hiab stabilising arms must also be allowed for on site. The
arms extend 2.5 metres either side of the truck.
The site must also be clear of overhead wires a minimum
of 4 metres from the Hiab hook at all times.
For partially buried tanks the centre of the tank cannot be
further than 5 metres from the position of the truck rear
wheels. Allowance must be made for excavation batters
in this measurement.
For fully buried tanks the centre of the tank cannot be
further than 4 metres from the position of the truck rear
wheels. Allowance must be made for excavation batters
in this measurement.
The excavated hole must be stable and safe before off
loading of the tank can commence.
Tanks cannot be placed on-site higher than the truck deck
height or 1200 mm.
If placement of the tanks is outside these measurements,
the tanks will require a special on-site crane for placement
which is at the cost of the purchaser.
Fig. 1 Above Ground
Note: Should the delivery contractor experience conditions outside
the above requirements, or other factors that delay the off loading of
the tanks, the client will be charged on an hourly rate for the cost of
these delays.
Site Preparation
■■
■■
■■
The Hynds Water Tank must be installed on solid ground
capable of taking the weight of the tank and water
contents (31.5 tonnes). In accordance with NZS 3604.
Fig. 2 Below Ground
The material forming the tank foundations must have
a safe bearing capacity of 100 kPa (Normal house
foundations).
Under no circumstances can any part of the tank be
installed on fill material or be part of a retaining structure.
Refer to table 1 for dimensions
Branches Nationwide Support Office & Technical Services 09 274 0316
Disclaimer: While every effort has been made to ensure that the information in this document is correct and accurate, users of Hynds product or information within this document must make their own assessment of
suitability for their particular application. Product dimensions are nominal only, and should be verified if critical to a particular installation. No warranty is either expressed, implied, or statutory made by Hynds unless expressly
stated in any sale and purchase agreement entered into between Hynds and the user.