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Offline ChristianTopic starter
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« on: February 05, 2009, 03:28:10 am »
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Has anybody any advice or ideas how to build an airlift for salvage work at about 60 m depth?

Best wishes,

Christian

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Offline Cornelius
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« Reply #1 on: February 05, 2009, 07:05:35 am »
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What kind of airlift do you have in mind Christian ? Do you want to lift heavy objects from the bottom or do you want to remove sand from these objects you have discovered .   Let me know .  Cornelius

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« Reply #2 on: February 05, 2009, 07:30:20 am »
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Hello Cornelius,

I am sorry I meant a dredge like this one:

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http://www.techdivetools.com/dig/dredges.html


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Christian

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« Reply #3 on: February 05, 2009, 07:42:53 am »
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Well Christian I could not give you any more clear instructions as what the  web-site is showing you . You cannot change the piping with PVC because it wears out too fast . You may use regular steel tubing provided you maintain it properly ( rust !! )    Cornelius

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« Reply #4 on: February 05, 2009, 07:50:21 am »
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Thank you Cornelius!

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« Reply #5 on: February 05, 2009, 07:55:23 am »
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You need a 60 meter hose with the right diameter . The top end is fastened to a float  . The end shoud discharge into a basket that will retain all the smaller finds that are sucked up .   Cornelius

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« Reply #6 on: February 05, 2009, 08:10:00 am »
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Hello Cornelius,

I just wonder how powerfull the dredge on the surface will need to be? Is a waste water dredge preferable over one for clear water?

Regards,

Christian

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« Reply #7 on: February 05, 2009, 08:20:28 am »
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Christian you do not suck-up the water from the top . You inject air through that little elbow you see at the sucktion side of the lift . The air mixes with water . This mixture ( lighter than the surrouding water ) rises and will be pushed )  to the surface  . The air should be regulated otherwise because of expansion while travelling to the top only air will come out .  Cornelius

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« Reply #8 on: February 07, 2009, 03:12:15 pm »
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Hello Cornelius,

so is this basically how it is supposed to work? About how string ought the air compressor on top to be? That is about how much liter of air / hour should it produce?

ALso should there be a net attached to the upper end of the lift pipe in order to collect small items which may get sucked up?

Thanks again for your advice and best wishes,

Christian

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« Reply #9 on: February 07, 2009, 03:35:55 pm »
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Christian the drawing you showed is exactly the way I explained it to you.  The pressure at 60 meters is 7 ata ( atmosphere absolute ) . In order to pump a volume of air through the little elbow into the main suction pipe the pressure should be al least about 10 ata . Now the trick is to regulate this high pressure air in such a volume that while expanding , rising to the surface it should not expand so much that it will fill the whole pipe . A small amount will do the job . That is why there should be a shut off ( regulating  ) valve on the air intake elbow .   Hope you will get it done .  Regards  Cornelius

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