6.0 System Maintenance - Netafim TECHLINE AS Design Manual

T E C H L I N E A S ™ D E S I G N G U I D E

6.0 System Maintenance

System maintenance shall take place at the start, midway and end of the irrigation season.
6.1 Filter
Remove cartridge from filter housing and clean disc cartridge thoroughly. Flush the housing out
before replacing filter cartridge and testing.
6.2 Techfilter
Techfilter cartridge shall be replaced at least every two years. Take note that the manufacturers'
handling instructions are carefully adhered to when removing and replacing the Techfilter
cartridge. Record replacement date of the cartridge and display it on the Techfilter housing.
6.3 Pressure Reducing Valve
Ensure that the pressure reducing valve is functioning properly. Test the line pressure at the
furthest point of the dripperline to ensure that correct operating pressures are maintained.
Adjust the pressure reducing valve accordingly.
6.4 Air/vacuum Release Valves
Locate Air/vacuum release valves and if necessary clean out valve enclosure. Remove
Air/vacuum release valve and ensure that the valve is functioning properly. Replace valve and
test.
6.5 Flushing the System
The drip system should be flushed out thoroughly. Locate flush valves and if necessary clean
out valve enclosure. Open all flush valves fully. Commence flush cycle. Flush valves shall be
closed off in sequence commencing with those located closest to the solenoid valve and
progressively working towards the furthest flush valves on the system.
6.6 Dripperlines
Operate station on a manual cycle for approximately 30 minutes. Walk over the irrigated zone
and perform a visual check of the drip system. Be vigilant for signs of wetness (leaks/damage to
pipe) or dryness (pipe blockages).
6.7 Check Flow Rates
Record the flow rate of each drip station and compare these figures with the flow data collected
at installation. Each dripperline shall be flushed out thoroughly three times to ensure that the
lines are free of any dirt or debris and that the dripperlines are filled with water. Commence
testing and record flow rate.
NETAFIM @BCL@C40BDC65.doc 37
21/12/2009