Asian Resources Int'l Limited MHG-T2 Manuale di istruzioni per l'uso e la cura - Pagina 16

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APPENDIX A – FOREBAY DESIGN

The instructions given on page 7 of this manual to design the forebay are adequate for

most cases. The most important aspects of forebay design are:

1) To allow a continual flow of water to the penstock so that the turbine keeps

functioning.

2) To have sufficient safeguards to prevent sand, vegetation and other debris

from entering the penstock which could cause blockages and disrupt the

turbine. This includes a safety aspect to keep away children and animals that

could possibly be injured by the suction of water entering the penstock.

3) To have an easy way to stop the water flow when changing the bearings etc.

The following diagram shows a simple forebay design that may be used to achieve all

the above goals.

the penstock. For example, if using the recommended 110mm diameter penstock then

95 x 1cm diameter holes should be drilled into the inlet screen (or 380 x 0.5cm

diameter holes etc.). The length of the inlet screen doesn't matter, so long as the

minimum number of holes can be added. Bore casing with narrow, long slits is ideal.

The cover will help keep the forebay clean and may be locked to keep away children.

Here, the forebay is made of a

waterproofed box situated

between the power canal (power

conduit) and the penstock. A

loosely fitting elbow is inserted

between the penstock inlet and

the main penstock pipe. Flow to

the penstock is cut off by pulling

the cord so that the inlet is out of

the water. The plugged drain is

used to periodically empty out

sand and leaves or else this can be

shoveled out. The perforated pipe

end further reduces litter intake.

Here the number of holes is

important so that flow is not

obstructed. To allow optimal,

uninterrupted flow, the open part

of the inlet screen should be at

least four times the open area of

PowerPal™ T2 Turgo 16