On this page I explain how I tested my housing and lamps.
First I needed a tube. A tube, firm enough to hold the pressure of about
100 meters water. A family member 'found' a tube. The diameter is 31 cm,
and it is 90 cm long. |
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On both ends of the tube I milled a groove. And in this
groove I put an O-ring |
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On both sides a cap is placed. It takes a lot of force to
get it over the O-ring and often the O-ring does not stay on it's place.
But with some patience and some dirty words the cap fits on the
tube. |
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Off course this is the inlet of the air for getting the
pressure inside the tube. It's a valve from the tube of my bicycle.
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But now the big problem is to hold the two caps on the tube, while the
pressure inside the tube is increasing. After a simple calculation I was a
little worried. The force at 10 bar on the caps is about 7 tons.
7 Tons.
I have a big car It's weight is 2 Tons. But 7 tons is something else.
So, sitting on it is not enough.....
I enforced the caps with an aluminium plate of 8 mm thick, which is pressed on the
cap with 6 bars M12. But with 1 bar pressure, the aluminium plates are
bending 2 cm. Thinking of 10 bar pressure instead of 1, I come to the
conclusion that an aluminium plate is not enough.
(For the photo I
did not tightened the butterfly nuts.)
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On the left you see the reinforced aluminium plate. With 3
U-profile bars. So applying again a pressure of 1 bar and see what the
bend is. Nothing.
Trying a pressure of 2 bar. Again nothing. Aaaah, that looks good.
Again raising the pressure. Now to 5 bar. Yeah. I see some bending, but
it is about 1 mm.
Raising the pressure to 8 bar. The maximum, my
compressor can do. The 6 bars M12 are very thigh. No wonder, because each
one of them has a tension of 1000 kg. But the tube and the caps are
holding tight. And it's not leaking!
Again, for the photo I did not tightened the butterfly nuts.
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Oh, by the way, this is how I applied the pressure inside. With
this test tube, I can test my camera housing and the lamps. |
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