Wavebox in a glass 180?

[panic]

I have heard that a wavebox is not safe for glass tanks. I have a Perfecto 180 RR with corner overflows. Does the wave weaken the seams of a glass tank?

Also, do the corner overflows cause issues with the wave?

ALSO, does the controller come with it or is that separate?

 

[rvitko]

The controller comes with it. Acrylic is almost non existant in Europe so the wavebox was built for glass tanks. The manual clearly states that a well built tank that is properly supported will lose about 10-15% of its lifespan when a wavebox is used. I don't have the highest opinion of perfecto but on an Oceanic for example, we could assume when the tank is on an Oceanic stand it will last 20 years, with a wavebox it will last 17-18 years instead. It is a definite stress on the seams as is any surge type device but realistically most people get a new tank in less than 10 years because they upgrade, move or scratch the old one. Corner overflows reduce the wave height and tend to be noisy and a centered overflow is ideal, but it will still work.

 

[Andrew]

Wouldn't the thickness of the glass take in effect also? I've seen some 240's at a lfs and the seems seem alot larger then the ones in my 75. Alot more silicone used. Also, would it effect an AGA that much more then any other tank? As long as I get 10 years out of it I would be happy.

 

[rvitko]

Yes, Tunze sites as a reference in the manual Timoshenko's Formula. A google search turns up numerous pages on this formula and the basic summary is, how to calculate appropriate bonding area for glass/silicon seams to withstand the contained pressure. The tank should be built within the specifications of this formula.