Shaft through metal under water
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Posted by: fzn10 ®

05/07/2006, 06:59:44

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Hi im an electrical engineering student, dont know much about mechanical. I want to built a small under water turbine, I need a water proof casing and currently the problem is having the shaft to go in to the metal casing without letting water and sand in, iv googled it, cant seem to get what i want. does any one have any good resources on how to do this. Thanx







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Re: Shaft through metal under water
Re: Shaft through metal under water -- fzn10 Post Reply Top of thread Forum
Posted by: randykimball ®
Barney
05/07/2006, 10:02:50

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How deep are you going to be going under water?

You need a gland for the shaft to pass through. The shaft needs to run true and not wobble in the gland. The gland needs to have a seal pressed into it which fits the shaft diameter and points the right direction to hold out water. (This similar to the seal that is used in places like the rear of your transmission of your auto to keep in transmission fluid). The gland needs to be water tight to the housing. I prefer to have two seals a short distance apart and place a lubrication between them during installation when using seals under water as water has very little lubrication quality. This keeps the seals "alive" longer.

If you are going to extreme depths you may need more seals and or a packing gland. Extreme depths would be thousands of feet.





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Modified by randykimball at Sun, May 07, 2006, 10:09:13


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