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Thread: Conduit appears to be burnt / melted all over the place

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    dissfigured's Avatar
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    Conduit appears to be burnt / melted all over the place

    All of the conduit running connecting the pump, cleaner, heater to the unit on the side of the house appears to be burnt for lack of a better word. It is as though it is melted.

    Has anyone seen this before?

    [attachment=0:1fyt84ti]IMG_20111112_155250.jpg[/attachment:1fyt84ti]
    [attachment=1:1fyt84ti]IMG_20111112_155236.jpg[/attachment:1fyt84ti]
    In-ground, SWG, 20,000 Gallons, Attached spa w/ Spillover, Hayward system, Cartridge Filter.
    Dallas TX

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    Re: Conduit appears to be burnt / melted all over the place

    My guess, would be rust!

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    Re: Conduit appears to be burnt / melted all over the place

    I would guess that it is caused by intense ultraviolet exposure. Are you somewhere that gets strong sun exposure?

    Here is an example of sun exposure: post248286.html


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    dissfigured's Avatar
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    Re: Conduit appears to be burnt / melted all over the place

    Yes, I live in Texas and my pool equipment is on a south unobstructed corner of the house.
    My PVC pipes are barely starting to do that as well.
    Interesting. I was afraid something was burning inside the conduit
    In-ground, SWG, 20,000 Gallons, Attached spa w/ Spillover, Hayward system, Cartridge Filter.
    Dallas TX

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    Re: Conduit appears to be burnt / melted all over the place

    If it were due to overheating from the wires in the conduit, then the damage would be all around the conduit. It looks like the damage is primarily on surfaces that are exposed to the sun.

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    Re: Conduit appears to be burnt / melted all over the place

    If that was sun exposure, it would not discriminate it that fashion. The metal in the flex conduit is rusting.

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    SCCS's Avatar
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    Re: Conduit appears to be burnt / melted all over the place

    How could that be rust with a plastic coating on the outside? That's SUN damage.
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    Re: Conduit appears to be burnt / melted all over the place

    Moisture on the inside... I've seen it before!

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    Re: Conduit appears to be burnt / melted all over the place

    Why would the rust only be on one side?

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    Re: Conduit appears to be burnt / melted all over the place

    Why would the sun damage only be between the plastic and the metal???

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    Re: Conduit appears to be burnt / melted all over the place

    The sun damage appears to be on the plastic. I don't even see any metal. That conduit might not even contain any metal.

    I don't think that it's rust. The poster should be able to tell if it's rust, or not, by a close inspection. Perhaps they could scrape off some of the brown and see if it's attracted to a magnet. Or, just try a magnet directly on the conduit.

    The exposure of PVC to the UV component of sunlight results in PVC molecules in the first .001" to .002" of exposed surface becoming permanently converted to a complex structure typified by polyene formations. The result is a brownish discoloration, often termed “UV Discoloration,” “UV Degradation,” or simply “Sunburn.”
    http://www.heritageplastics.com/pdf/Eff ... posure.pdf
    Grey pipe will have brown or black streaks
    http://www.jmeagle.com/pdfs/Technical%2 ... sonPVC.pdf
    http://www.pwpipe.com/literature/tb/tb-d9.pdf

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    dissfigured's Avatar
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    Re: Conduit appears to be burnt / melted all over the place

    I know it is called "liquidtight flexible nonmetallic conduit" so I don't know if there is metal on the inside or if nonmetallic means no metal at all.
    I will get my macro lens and see if I can get a better sample and will also scrape some off and inspect it a little closer.
    In-ground, SWG, 20,000 Gallons, Attached spa w/ Spillover, Hayward system, Cartridge Filter.
    Dallas TX

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    Re: Conduit appears to be burnt / melted all over the place

    Non-metallic means no metal at all. It has a rigid PVC spiral core for strength. It should be marked "Outdoor" to specify its suitability to be used outdoors. You can try a magnet to see if it sticks to the conduit to confirm that there is no steel.

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    dissfigured's Avatar
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    Re: Conduit appears to be burnt / melted all over the place

    OK, I am guessing sun damage may be right.
    Here are some photos that show a cross section, and clearly no metal where it has been cut.
    Surface almost appears "bubbly" like it is melted.

    So now, what do I do? Do I need to replace it all, or can I just coat it in something to make it more esthetically pleasing?
    This stuff seems pretty thick so I am assuming it looks bad but at this rate will probably take a lifetime to cause a real problem.

    Thanks for all the help.
    [attachment=0:qqe004h4]IMG_3375.JPG[/attachment:qqe004h4]
    [attachment=2:qqe004h4]IMG_3376.JPG[/attachment:qqe004h4]
    In-ground, SWG, 20,000 Gallons, Attached spa w/ Spillover, Hayward system, Cartridge Filter.
    Dallas TX

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    Re: Conduit appears to be burnt / melted all over the place

    I would take a file to knock down the bumps, then paint it with some gray paint. Just my .02.
    16,500 gal Roman end with PebbleFina finish
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    Easytouch controls with an IC40 chlorinator
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    Mod Squad Bama Rambler's Avatar
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    Re: Conduit appears to be burnt / melted all over the place

    Either don't touch it or replace it. It'll last many more years just like it is. You could paint it but I wouldn't worry about it.
    Dave J. TFP Moderator
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    Re: Conduit appears to be burnt / melted all over the place

    I would be tempted to just plant something in front of it or build a box in front of it to make it less visable and a bit protected from the sun.
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    Re: Conduit appears to be burnt / melted all over the place

    It's definitely from the sun just spray some 303 Aerospace Protectant or shade it to protect it from more damage.
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