2018-2019 Horticultural Catalog

Pressure
• Water pressure is the force at which water moves through the
line and is measured in pounds per square inch (psi)
• Water pressure is determined by your source and can be modified
with pumps and regulators (see page 379)
• Pressure can be determined by attaching a mobile pressure
gauge (see page 410) to a hose bib
• Most municipal water sources have between 40 and 80 psi
Flow
• Flow is the rate at which water moves through the system and is
measure in gallons per minute (gpm) or gallons per hour (gph)
• This is affected by the size of the line the water is flowing
through; a bigger line equals higher flow
• Flow can be determined by filling a known volume container and
timing the process
• For example: time how long it takes to fill a five-gallon bucket.
If this takes 1 minute your flow is 5 gpm and 300 gph
Mist System
Irrigation Helpful Hints
Drip System
Hummert’s Helpful Hints
Line Sizing
Use these examples along with the sizing chart below:
Dripper System:
• System requires 300 drippers at .5gph
• 300 x .5gph=150 gph flow required
• 150gph/60min=2.5gpm required
• According to the chart, a 16mm line can supply the entire system
Mist System:
• System requires 20 misters at 10.4 gph
• 20 x 10.4=208 gph flow required
• 208/60min=3.5gpm flow required
• According to the chart, 3.5 is too high for 16mm to supply without
dividing into 2 zones
• For 1 zone, ¾” line would be necessary
Helpful Information for Designing a
NETAFIM Hanging Basket
Watering System
The following information is provided as a rough guide to help in
determining the necessary components of an automatic watering
system for hanging baskets.
1. Determine the dripper supply pipe sizing (the pipe from which the
baskets will be hung) using CHART NO. 1. This is based on the
spacing of hanging baskets on each length of run.
2. Total the number of baskets intended to be watered per zone at
one time. Determine the GPM necessary using the Zone Flow
(GPM) CHART NO. 2 to determine now many gallons of water per
minute (GPM) it will take to provide enough water at the rate of
0.5 GPH (gallons per hour) per basket.
3. Use CHART NO. 3 to determine the mainline and distribution pipe
sizing based on the total GPM of water demand.
Irrigation Helpful Hints
Equivalency Chart
1
⁄8” = .125” = 3.18 mm
1
⁄4” = .250” = 6.35 mm
3
⁄8” = .375” = 9.52 mm
1
⁄2” = .500” = 12.69 mm
5
⁄8” = .625” = 15.87 mm
3
⁄4” = .750” = 19.05 mm
1” = 1.000” = 25.40 mm
1 1 ⁄4” = 1.250” = 31.74 mm
1 1 ⁄2” = 1.500” = 38.10 mm
2” = 2.000” = 50.80 mm
3” = 3.000” = 76.19 mm
4” = 4.000” = 101.59 mm
14 mm = .5510”
15 mm = .5905”
16 mm = .6300”
17 mm = .6659”
19 mm = .7480”
25 mm = .9845”
250 barb = .250” = 6.35 mm
400 barb = .400” = 10.00 mm
520 barb = .520” = 13.20 mm
700 barb = .700” = 17.70 mm
Abbreviations
MPF -
Male Press Fit
FPF -
Female Press Fit
FPT -
Female Pipe Thread
MPT -
Male Pipe Thread
GPH -
Gallons Per Hour
GPM-
Gallons Per Minute
4mm/7mm -
4mm inside dia. x
7mm outside dia.
PE -
polyethylene
CHART NO. 1
Length of Pipe (feet)
GPM
GPM
50
100
150
200
250
300
Supply Pipe Sizing
Dripper Spacing
6” 12” 18” 24” 36”
16mm
poly
1 /2”poly
3 /4”
poly
1”
poly
CHART NO. 2
16mm
poly
1 /2”
poly
3 /4”
poly
16mm
poly
16mm
poly
1 /2”
poly 1 /2”
poly
3 /4”
poly
Zone Flow (GPM)
16mm
poly
Number of Hanging Baskets
200 400 600 800 1000
2 3 5 7 8
1200 1400 1600 1800 2000
10 12 13 15 17
CHART NO. 3
Distribution &
Mainline Pipe Sizing
Pipe Maximum GPM
Size PVC POLY
16 mm N/A 3.3
1/2” 6 4
3/4” 10 8
1” 17 13
1-1/4” 28 20
1-1/2” 37 27
2” 58 50
3’ spacing
between sprinklers
DISTRIBUTION
PIPE
SPRINKLER
SUPPLY PIPE
MAINLINE
PIPE
800-325-3055
www.hummert.com
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