PowerSpout
TRG installation 2018
Last revised July 2018
© 2018 EcoInnovation Ltd (NZ)
Page 15
Jet cap should only be hand-tightened, to retain jet insert on the inner end of the jet sleeve.
But take care it does not fall off and get washed away.
2.1.6.
Jet inserts
The jets control the flow rate. A larger orifice results in more flow. Use a suitable size and
number of jets to harvest most of the available flow at any given time. If the available flow is
sometimes insufficient to feed your chosen jets, then air will enter the penstock, reducing the
efficiency of the turbine. Then you must use fewer and/or smaller jets to get the most power
from your diminished flow.
You will be supplied with jets that will deliver the correct flow for your site as you have
reported it.
Four spare jet inserts are also supplied with your turbine. The hole inside is tapered.
Enlarge the jet by shortening the plastic insert on site with a sharp knife. The inserts are
inexpensive so a trial and error approach can quickly determine the correct jet size.
It is important to cut your jet to the correct size cleanly so that the water jet can break
smoothly without spray. We recommend using a sharp knife and paring away at the jet,
cutting from the inside edge out. With practice a very accurate and sharp edged jet can be
prepared in the field. The taper gauge and knife supplied in the optional PLT tool kit helps to
make this task easy.
Holding the plastic jet within a spare holder sleeve and end cap will ensure
the jet is held firmly while you cut it to size. Take care, as it is easy to slip,
which could result in a significant flesh wound. If you have Kevlar gloves,
wear them.
