Drip tape product naming

Unlike most drip lines that publish the flow per hour of each dripper, drip tapes have historically, and still today, presented the flow per 100 m/hour (metric) and flow per 100 ft/minute (USA). Therefore, Rivulis T-Tape product naming is as follows.

Metric

Calculating the flow per dripper for T-Tape

Step Formula Example using 508-30-340

Calculate how many drippers per meter

1/[dripper spacing in meters]

1/0.3 = 3.33

Expand to how many drippers per 100 m

[drippers per meter] x 100

3.33 x 100 = 333

Divide by the flow per 100 m for the flow per dripper

[total flow per 100m]/ [drippers per 100 m]

340/333 = 1.02 l/h per emitter
(nominal 1 l/h per emitter)

     

 

US measurements

Calculating the flow per dripper for T-Tape

Step Formula Example using 508-30-340

Calculate how many drippers per foot

1 ft/[dripper spacing in inch]

1 (ft)/12 (inch) = 1

Expand to how many drippers per 100 ft

[drippers per feet] x 100

1 x 100 = 100

Divide by the flow per 100 ft for the flow per dripper

[total flow]/[emitters per 100 ft] = [flow in gpm/emitter]

0.45/100 = 0.0045 gpm/emitter

Multiply by 60 for the flow per hour

[gpm/emitter] x 60

0.0045 x 60 = 0.27 gph/emitter

     

 

Important: The flow rate of standard T-Tape is calculated at 0.55 bar (8 psi) pressure. Most other drip lines, and even some drip tapes, use a different pressure to calculate the flow rate.

To ensure the comparison is ‘apples–apples’, use the table below to match the flow per emitter by matching the flow rate of 0.55 bar/8 psi (top row) to the flow rate of the comparative drip line/tape.

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