# Sizing Pipe And Valves

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Information about Sizing Pipe And Valves

Published on January 18, 2008

Author: sherylwil

Source: slideshare.net

Sizing pipe and valves

Velocity Safety limit for pipe is 5 ft/second Look at chart on page 66 of Rainbird Landscape Irrigation Design Manual Find where the velocity exceeds 5 ft/second We must select pipe that doesn’t exceed this amount

Safety limit for pipe is 5 ft/second

Look at chart on page 66 of Rainbird Landscape Irrigation Design Manual

Find where the velocity exceeds 5 ft/second

We must select pipe that doesn’t exceed this amount

Example pg 65 First circuit is 4 heads on one valve Straight line lateral circuit – least efficient Radius of sprinklers is 47 ft 55 psi 9.8 gpm Wants to use class 200 PVC pipe

First circuit is 4 heads on one valve

Straight line lateral circuit – least efficient

Radius of sprinklers is 47 ft

55 psi

9.8 gpm

Wants to use class 200 PVC pipe

Size in Reverse Called critical circuit length Section D, farthest away 9.8 gpm Cannot exceed 5 ft/s Look on the chart for the smallest pipe that can carry 9.8 gpm and not exceed 5 ft/s ¾” pipe can carry 10 gpm with a velocity of 4.72 ft/s

Called critical circuit length

Section D, farthest away

9.8 gpm

Cannot exceed 5 ft/s

Look on the chart for the smallest pipe that can carry 9.8 gpm and not exceed 5 ft/s

¾” pipe can carry 10 gpm with a velocity of 4.72 ft/s

Section C Supplies two sprinklers 9.8 gpm x 2 = 19.6 gpm Look at the chart What is the smallest size that can handle 19.6 gpm and not exceed 5 ft/s 1 ¼” pipe

Supplies two sprinklers

9.8 gpm x 2 = 19.6 gpm

Look at the chart

What is the smallest size that can handle 19.6 gpm and not exceed 5 ft/s

1 ¼” pipe

Section B Three sprinklers 9.8 x 3 = 29.5 gpm 1 ½” pipe Section A 9.8 x 4 = 39.2 gpm 2” pipe

Three sprinklers

9.8 x 3 = 29.5 gpm

1 ½” pipe

Section A

9.8 x 4 = 39.2 gpm

2” pipe

Size Circuit #2 Compare to Circuit #1 Advantages to splitting the circuit, smaller pipe sizes, less gpm needed

Compare to Circuit #1

Advantages to splitting the circuit, smaller pipe sizes, less gpm needed

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