Hi Warren

We have a shop here which sell cheap tanks. All new and guaranteed.

Is it safe to buy a 4' x 18" x 18" and 6mm glass?

They want $60 and deliver free.

Thanks John

John1 said...

> Is it safe to buy a 4' x 18" x 18" and 6mm glass?

Buying is safe. Filling with water, now that may be a different

story

As a data point, I've used (suitably braced) tanks of those dimensions

in the past with no problem. I wouldn't go over 18 inches deep, over

any reasonable sort of length, in 6mm glass regardless of bracing.

$60 seems a good price, assuming quality of build is decent.

Andrew, not Warren.

Hi

Thanks Andrew (not Warren) :lol:

John

If you had spent a few seconds and used the glass thickness calculator in the articles section of this website you could have worked the answer out for yourself. It would have told you for a proper saftey margin of 3.8 a tank this size should have glass approx 8.5mm thick. The 6mm glass used will only give 175% strength.

This should be ok as long as the tank is supported well on a very flat and strong surface. Most tanks are not filled right to the very top anyway and this helps increase the saftey margin.

Thanks Warren (not Andrew)

John

No worries, I've had tanks a bit taller than 18" and the same length and they've always been ok.