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Thread: Measurements for a habitat

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    Measurements for a habitat

    We are planning to install a habitat to our local dive site. In the plans we have a tube with diameter of 1,5m and 2m height. Ideally we would like to cram in 3 Rebreather divers with units on, but I think we need to leave the RBs out and use bottled O2 instead.

    We are thinking of putting a platform hanging underneath for dekitting and staging the RBs. Then just some simple bench on the walls of the habitat.

    Would be nice to get comments and tips what to consider in building one. The idea is to support it against the cave roof.

    JH

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    Re: Measurements for a habitat

    Quote Originally Posted by jhaaja  View Original Post
    We are planning to install a habitat to our local dive site. In the plans we have a tube with diameter of 1,5m and 2m height. Ideally we would like to cram in 3 Rebreather divers with units on, but I think we need to leave the RBs out and use bottled O2 instead.

    We are thinking of putting a platform hanging underneath for dekitting and staging the RBs. Then just some simple bench on the walls of the habitat.

    Would be nice to get comments and tips what to consider in building one. The idea is to support it against the cave roof.

    JH
    Having sampled some of your "local dive sites" first thing I would install in there would be a sauna!!:)

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    Re: Measurements for a habitat

    Quote Originally Posted by dave t  View Original Post
    Having sampled some of your "local dive sites" first thing I would install in there would be a sauna!!:)
    Unfortunately you did not get to dive the best ones :) But I guess you got a grip of the warm water and nice weather, Holiday Diver from England :)

    Actually a sauna is also on the list, would be nice to drive the helium and nitrogen out with serious heat, O2 and beer

    JH

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    Re: Measurements for a habitat

    The sauna comment is really not that far out of line. If the habitat is close enough to the exit point I would run an umbilical from the surface. With this you could run hot water, comms with the topside support team & surface supplied O2.

    RAL

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    Re: Measurements for a habitat

    To answer the actual question:

    1. you will need to remove back mounted gear, otherwise you will end up with full weight of kit on your shoulders, and likely not be able to get out of the water.

    2. you should expect to Sit down, so 2M high is way to big. and will be unstable when wedged on the ceiling

    3. it's too small for 3 divers.

    4. seats ideally need to be fat enough so as not to cause pressure on backs of legs (and so restrict blood flow)

    5. Seats need to be movable to allow entry / exit you won't have much water surface with 2 or 3 seats down.


    The best way to test size is to make one out of cardboard and try to fit in (on dry land), that way you get to find out what you need without expense. I did this, it's quite enlightening.

    what is the passage floor like? An inflatable system is generally a lot more flexible and easy to manage underwater and above. if you can place bolts at or near the floor you can use an inflatable system.



    good luck
    John
    Last edited by johnv; 27th May 2008 at 13:19.

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    Re: Measurements for a habitat

    the habitat we have put in song hong is quite small so were using folding seats.


    Two plastic seat bases (frames removed) supported by a piece of rope threaded through sides so seats can be folded up to make more room.


    Added lots of loops on bottom lip to clip gear to and inside habitat at top added a hanging point so stuff can be hung inside out the water (food, drink books etc)

    we have the habitat supported up against the cave roof
    Last edited by Drmike; 27th May 2008 at 13:40.

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    Re: Measurements for a habitat

    Thanks for good points! Foldable seats are needed to get divers in. Any succestions about the distance from the habitat to the platform hanging underneath it?

    JH

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    Re: Measurements for a habitat

    Quote Originally Posted by jhaaja  View Original Post
    Thanks for good points! Foldable seats are needed to get divers in. Any succestions about the distance from the habitat to the platform hanging underneath it?
    you probably want to be able to stand somewhere between chest and waist deep. attach the platform using rope, you can then change the height after testing if required.

    The closer the platform is to the air surface, the less space you have to enter. I've used a platform, simple aluminium bar and nothing, depending on the location.

    One other thought, a major disadvantage of a habitat that is fixed on the ceiling is that you can't change the height. If the cave permits variable height habitat between 12-6m you can double your "out of water" time.

    John

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