Asian Phoenix Resources MHG-T16 Use And Care Instructions Manual - Page 6
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desirable, if the head is too large then the rotor will turn too fast and reduce the life of
the bearings.
Do not attempt to exceed the recommended head height.
Measuring Flow
While the range of head for both T8 and T16 models is the same, the main difference
between them is one of water flow. For flows less than 66 l/sec a MHG-T8 is required
and for flows greater than 40 l/sec the MHG-T16 is recommended.
The best way to measure the water flow is to use the 'weir method', which is beyond
the scope of this manual. Your PowerPal dealer should be able to advise you about
flow measurement otherwise contact the manufacturer. Another method is the
'container method'. Take a piece of pipe the same diameter as the penstock, insert it
in the stream or dam where the flow is expected to come from, and measure the flow
from there.
In the diagram below, a short length of pipe (less than 1 meter) is buried into the side
of a small 'dam' using mud or improvised sandbags. The top end of the pipe is
completely submerged and part of the normal stream flow is diverted through the
pipe. When this is flowing smoothly, a bucket of known volume is quickly placed to
collect this flow and the time it takes to fill the bucket is recorded. The ideal bucket
size would be 100 or 200 litres (half or a whole empty oil drum). Divide the volume
of the bucket (in litres) by the time it takes to fill the bucket (in seconds) to get the
approximate flow rate in litres per second.
SITE PREPARATION
Once the correct head and flow have been located then the length and position of the
penstock can be determined. While vertical head is important, the horizontal slope and
penstock length may vary although penstock inclination should be >60°.
Measuring Flow:
Flow = volume of bucket (litres)
time to fill bucket (seconds)
PowerPal™ T8 & T16 Turgo 6