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PostPosted: Mon Aug 06, 2018 3:56 pm 
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Hi, I have an Aquamarin Hauswasserwerk 1500w garden water surface mounted pump with pressure tank. There's a frost-damage hairline crack in the plastic casing of the pump, from which the water circulates through the tank. How can I fix the leak, given that I do not know what type of plastic it is? Will I have to use a plastic welder? I'd be grateful for any advice. I have access, by the way, to both the outside and the inside of the container, and cleaning it in preparation will be easy.I would prefer to buy the part but it's a German firm and I've had no luck with finding replacement parts in the UK.


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PostPosted: Mon Aug 06, 2018 4:43 pm 
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Assuming this part is not going to be under any significant stress, I would use flashbanding. I have used it successfully repair water butts. It remains flexible so won't leak even if the part is subject to a little movement, glues are not usually that forgiving.



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PostPosted: Mon Aug 06, 2018 5:51 pm 
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replace the part or replace the pump, if its under any sort of pressure it will pinhole and crack again

if its in a live pond eg. with fish, I would be wary of doing a repair as the repair/raw plastic may leech into the water



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PostPosted: Mon Aug 06, 2018 6:51 pm 
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Just an idea, not tried it and haven't fully read this thread:

http://www.ultimatehandyman.co.uk/forum1/sugru-free-samples-t79869.html

There's a video in the first post. Obviously all the free samples have long gone but it's available on fleabay & Amaxon, £6.99.



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PostPosted: Tue Aug 07, 2018 9:40 am 
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Thanks everybody for all the tips and info. I followed the links to the Sugru site, but I'm not sure the substance would work with surfaces under pressure. With that pump the water is pumped through the leaking chamber and at the moment it bursts through the crack as if it was much wider, because of the water pressure.I think I'll take the advice about not bothering to try to repair the pump, because it probably would not work, given the water pressure. The only alternative, as far as I can see, would be to learn all I can about plastic welding and hope that the welding equipment will not be too expensive. Thanks again.


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PostPosted: Tue Aug 07, 2018 10:45 am 
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it seems a common issue with these pumps the parts seem to be non existent too



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PostPosted: Tue Aug 07, 2018 12:24 pm 
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J B Weld Marine epoxy perhaps?
never used it, and calling it poxy adhesive is not a great marketing ploy, but it says on the tin to 3960 psi

https://www.amazon.co.uk/J-B-Marine-Wel ... FMSJ8NBPJ6



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PostPosted: Tue Aug 07, 2018 7:59 pm 
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That looks suitable, the review where a purchaser fixed a crack in a aluminium gearbox housing would be a similar use, i.e. sealing a crack as opposed to gluing two parts together. This was what I had in mind for Sugru, though the gearbox would not have been pressurised from the inside.

However, note, it says "Strength 3960psi" which may not be the same as "capable of sealing pressurised joints with up to 3960psi inside them". It more likely means it needs a force of 3960psi to pull a glued joint apart? As in if one glued a 1" x 1" face to another 1" x 1" face, it would take 3960lbs of force to pull them apart? That's 1.8 tonnes!



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