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Thread: Prism 2: Cracked Scrubber Cannister Lid

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    RBW Member maxguru is an unknown quantity at this point maxguru's Avatar
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    Prism 2: Cracked Scrubber Cannister Lid

    Hi,

    I managed to crack the lid on my Prism 2's scrubber cannister this weekend... long story.

    I have a spare cannister & lid, but since I've had a failure, I see an opportunity to engineer a better solution.

    What's the best material to machine a replacement lid from...
    Aluminum?
    Stainless?
    Delrin?

    Thanks,
    max

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    Mature mouth breather silent running has a reputation beyond repute silent running has a reputation beyond repute silent running has a reputation beyond repute silent running has a reputation beyond repute silent running has a reputation beyond repute silent running has a reputation beyond repute silent running has a reputation beyond repute silent running has a reputation beyond repute silent running has a reputation beyond repute silent running has a reputation beyond repute silent running has a reputation beyond repute silent running's Avatar
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    Re: Prism 2: Cracked Scrubber Cannister Lid

    Quote Originally Posted by maxguru  View Original Post
    Hi,

    I managed to crack the lid on my Prism 2's scrubber cannister this weekend... long story.

    I have a spare cannister & lid, but since I've had a failure, I see an opportunity to engineer a better solution.

    What's the best material to machine a replacement lid from...
    Aluminum?
    Stainless?
    Delrin?

    Thanks,
    max
    Hi Max, from a thermal standpoint, the Delrin will hold heat longer than aluminum or stainless, as will any epoxy or plastic. Which is of course good for keeping the scrubber reaction going at max efficiency.

    Apparently Delrin does off gas, but there are different views on whether itís of any concern to CCR divers, who pass large volumes of gas around the loop and vent when ascending. This has been discussed before if you would like to check the rebreather world search function. I know there are manufacturers that stay away from Delrin, but I am not sure what they use whether itís some kind of resin or something else. I know the P1 is made of some type of resin, no Delrin on it... -Andy

  3. #3
    Supporting Member Pilot_dc is an unknown quantity at this point Pilot_dc's Avatar
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    Prism2

    Re: Prism 2: Cracked Scrubber Cannister Lid

    Could also be an opportunity to re-design a new scrubber. To me, the threads being constantly gummed up unless the user is ultra careful, and having to tap the canisterís safety-critical sealing surface are fairly big design flaws.

    Iíve seen other radial scrubbers that use rigid sides and a spring lid with latches to take up room from settle sorb. These canisters are, according to the users I know with experience on both, far easier, quicker and cleaner to pack.

    Provided that the base spring interface, sealing surface and overall dimensions are kept the same, thereís no reason the lid system couldnít be modified.

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