T E C H L I N E A S ™ D E S I G N G U I D E
NETAFIM @[email protected]
21/12/2009
35
TECHLINE AS™ INSTALLATION GUIDE:
Specifications
:
The information in this guide should be used when installing drip irrigation
system in conjunction with specific design details that are usually supplied on a Drip Irrigation
Design/Plan. Specifications on the irrigation design/plan will always take precedent over the
information in this guide.
Drip Irrigation System Specification
1.0 Solenoid Valve
Solenoid valve is to be installed to the main-line and housed in a lockable valve box
(at least
250mm in diameter)
that shall have sufficient room to access and maintain the valve. All wiring
into the valve enclosure shall be looped to allow for expansion and contraction and servicing.
Only one valve per valve box unless otherwise agreed with the site supervisor. All valve boxes
shall be supported by bricks to ensure that the valve box does not come in direct contact with
the pipe work. Place gravel to a depth of 50mm in the bottom of the valve enclosure.
2.0 Filters
Arkal disc filter with a mesh size of 120 mesh
(130 micron)
shall be installed on all dripperlines
either immediately downstream of the solenoid valve or at the head works. Ensure that the filter
is fully installed prior to the flushing of any dripperlines or sub-mains. Filter shall be accessible
for servicing and installed in an appropriately sized valve box which shall be free of any dirt or
debris. Place gravel to a depth of 50mm in the bottom of the valve enclosure.
3.0 Techfilter
Tech-filter is required wherever the dripperline is buried directly into the soil
(SDI)
and installed
immediately downstream of the filter. Ensure that the Techfilter is installed prior to the
installation of any dripperline. Tech-filter shall be accessible for servicing and installed in an
appropriately sized valve box which shall be free of any dirt or debris. Place gravel to a depth of
50mm in the bottom of the valve enclosure. Also ensure that the appropriate back-flow device
(ARI RPZ) is used whenever a Tech-filter is used. Record the date that the Techfilter cartridge
should be changed
(normally every two (2) years)
and fix this to the Techfilter body.
4.0 Pressure Reducing Valve
Pressure reducing valve is to be installed downstream of the Filter
(or in SDI, Tech-filter).
Ensure that the pressure reducing valve is accessible for adjustment and servicing purposes
and housed in an appropriately sized valve box which shall be free of dirt or debris. Place gravel
to a depth of 50mm in the bottom of the valve enclosure.
5.0 Dripperline Installation
Dripperline will be installed in a grid formation. All lateral lines will be connected to a feed and
collecting sub-main. All lateral lines are to be installed ensuring that all laterals are laid
uniformly, free of any kinks or restrictions and are staked down at regular intervals.
Unless otherwise specified on the irrigation plan all dripperline is to be installed to the
recommendations listed below:
Soil Type
Drip
Dripperline
Min. depth below
spacing (mm)
spacing (mm)
surface (mm)
Light
300
300
15
Medium
400
400
100
Heavy
500
500
150
