Dura-Flo PC: Landscape Design Guide 7

In order to have a balanced system with good emission uniformity between all drip emitters, the maximum recommended length of a DURA-FLO^TM PC dripperline must not be exceeded.

The following chart indicates the maximum recommended length, based on no elevation changes, and will also help in deciding on the optimum operating pressure of the system.

Chart 2

MAXIMUM LENGTH OF RUN (FEET)

Initial Pressure 12" spacing 18" spacing 24" spacing



15 psi

20 psi

25 psi

30 psi

35 psi

40 psi

45 psi

1/2gph 1gph 2gph

210' 155' 100'

260' 195' 125'

315' 230' 150'

345' 255' 165'

380' 280' 180'

405' 300' 190'

430' 315' 200'

1/2gph 1gph 2gph

300' 220' 145'

375' 275' 180'

450' 330' 215'

495' 360' 235'

540' 395' 255'

575' 420' 275'

610' 450' 290'

1/2gph 1gph 2gph

380' 280' 180'

475' 350' 225'

570' 420' 270'

625' 460' 295'

685' 505' 320'

730' 535' 340'

775 570' 360'

Example:

1. If you have 18" spacing, 1 gph flow rate and an available pressure of 45
    psi, the maximum length of run would be 450'.
2. If you have 18" spacing, 1 gph flow rate, but only have 25 psi available
    pressure the maximum length of run would be 330'.
3. If you have 24" spacing, 1/2 gph flow rate and needed to run 500', the
    minimum pressure required would be about 22 psi.

All the above calculations are based on end feeding the DURA-FLO^TM PC dripperline. If necessary, the maximum allowable length can be increased by center feeding the zone. Hence, the length shown in the chart can be used in each direction effectively doubling the maximum length.

The following series of curves gives the actual friction losses for the various discharge rates and spacings.

These curves can be used in calculating actual friction losses within the system for various lengths.