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AuthorMessage
Andyneal
Andyneal

Posted: Wed Feb 10, 2016 10:31am

Post Subject: Steel holding tank

I have a ten year old narrowboats with a steel sewage holding tank. I have never seen inside it and as far as I know it does not have an access hatch (it is currently boxed in under a fitted dinette area). Should I be cutting an inspection hatch and how should I treat the tank once inside ? Should I be worrying?

Tony-B
Tony-B

Posted: Wed Feb 10, 2016 5:16pm

Post Subject: Steel holding tank

Only 10 years old!. Mine is over 25 and I am not worrying but I do get a tad concerned when I find water in the accommodation bilge until I can sniff it. Much depends upon how thick the steel was to start with. Remember Springers were reported as using 4 or 5mm steel for their hulls and enough of them are still afloat. It is also reported that welders who have had reason to take such tanks out report them to be in very good condition, maybe the contents tend to pickle the steel. If you cut a trap in the top and find the steel is not very thick you then have a problem with getting strong enough fixings with an air tight seal. My advice would be to stop worrying but possibly try t find a way of getting a look at the outside of the tank so you can see when rust "scabs " start to from on the outside. They might indicate a potential leak, especially if any are dark looking and not dusty.

Andyneal
Andyneal

Posted: Tue Feb 23, 2016 12:34pm

Post Subject: Steel holding tank

Many thanks for the advice. I will get on with 'unboxing' the tank to gain confidence from seeing the outside of the tank.

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