Mainline Sizing; Submain Sizing; Zone Water Requirements - 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

MAINLINE SIZING:


Use the table below to calculate the appropriate mainline size based on the required
flow rate, distance and allowable head loss.

Head loss is shown in metres (1m = 10kPa).

SUBMAIN SIZING:


The table below will help you size your submain.

Simply select the shape that best represents your area and follow the table to the
number of outlets (dripperline laterals) that will be operating from your submain. Multiply
the factor by the mainline head loss (indicated above) to calculate head loss for
submain.

For systems with less than 5 outlets simply use the Main line head loss.
Example: Submain of 20m to feed 10 outlets with a total flow of 10L/M.
19mm LDPE can supply up to 18L/M over a 20m run with a head loss of 1.5m (15kPa).
If the area is rectangular in shape the factor (refer above chart) for 10 outlets is 0.43.
Multiply 1.5m (15kPa) loss by 0.43 to determine that the submain loss is 0.645m (6.45kPa).

ZONE WATER REQUIREMENTS:


Once Techline AS™ is laid out, we need to identify the total zone flow. This will help to
determine mainline, submain as well as feed and collection manifold sizing, valve, filter
and pressure regulator selection.

Due to Techline AS™ having a pressure compensating (PC) dripper, the flow rate over
a 50m run length is the same over a wide pressure range (50kPa – 250kPa).

There are three ways to determine flow in a Techline AS™ zone.

Method 1: Use Table 3 below to calculate the amount of Techline AS™ (in 50m
lengths) and calculate total zone flow.

Method 2: Multiply the number of Drippers by the Dripper Flow rate.
NETAFIM @BCL@C40BDC65.doc 13
21/12/2009