Installation Guide

You need to determine the available water flow for your sprinkler system so you'll know
h
ow many sprinkler heads can run at one time. Water flow is measured in gallons per minute
or GPM.
Measure Your Water Pressure
• Attach an Orbit
®
pressure gauge (part #
53020, 91130) to an unregulated outside
faucet*. Unregulated means a line without
a pressure regulator.
• Open the faucet and record the reading
on the gauge. No water should be running
during the test.
PSI _________
Measure the Main Water Service Line
• Wrap a piece of string around your main
w
ater service line then measure the length
of the string.
• Use the table to convert the string length
to pipe size (diameter).
Note: The main water service line is the pipe that runs from
the water meter to the house. If you're connecting to a line
other than the main line, measure the line that you will be
connecting to.
Pipe Size _________
S
ystem Capacity
Use the main
line pipe size
and pressure
(PSI) taken to
determine the
gallons per
minute (GPM)
capacity of your
system.
GPM Capacity ___________
* If an unregulated faucet is unavailable, call the local water district for an estimated PSI.
Important: If your water pressure exceeds 80 PSI, use a pressure reducer
. Excessive pressure may damage system.
Planning & Design
Sprinkler System Layout & Installation Guide
4
200 0
180 20
160 40
1
40 60
120 80
100
psi
O
rbit
2
0
0
0
1
8
0
2
0
1
6
0
4
0
1
4
0
6
0
1
2
0
8
0
1
0
0
psi
Orb
it
200 0
180 20
160 40
1
40 60
120 80
100
psi
O
rbit
2
0
0
0
1
8
0
2
0
1
6
0
4
0
1
4
0
6
0
1
2
0
8
0
1
0
0
psi
Orb
it
DETERMINE SIZE OF SERVICE LINE
Length of string 2" 2-3/4" 3-1/4" 3-1/2" 4-1/4"
Copper pipe size 1/2" 1"
PVC or galvanized pipe size 1/2" 3/4" 1"
3/4"
3
MEASURE WATER FLOW
WATER PRESSURE (PSI)
35 LB. 40 LB. 45 LB. 50 LB. 55 LB. 60 LB. 65 LB. 70 LB. 75 LB.
MAIN
LINE
SIZE
1/2"
3.5 5.0 6.0 6.5 7.0 7.5 8.0 9.0 9.5
3/4"
7.5 9.0 10.0 12.0 13.0 14.0 15.0 16.0 17.5
1"
10.0 11.5 13.5
15.0
16.0 17.5 18.5 20.0 21.0
07WTM003045 53251-01 rE.qxd 3/2/07 2:30 PM Page 4