Replacing glass on 240...advice? - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 12 (permalink) Old 06-13-2005, 10:26 PM Thread Starter
Got wood???
 
Badcopnofishtank's Avatar
 
PTrader: (208/100%)
Join Date: Jan 2004
Location: Northern Arizona
Posts: 1,094
Replacing glass on 240...advice?

I am getting ready to get this glass ordered to repair my 240 gallon tank and my buddy (who owns a glass biz) asks if I want 1/2 inch tempered or non-tempered for the front. It came with regular 1/2" non-tempered. Which should I go with?

The cool news is its going to cost a lot less than I thought to fix it about $150.00, and the front was scratched anyways so it will look brand new!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Badcopnofishtank is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 06-14-2005, 12:08 PM
PT Biologist
 
SCMurphy's Avatar
 
PTrader: (4/100%)
Join Date: Oct 2003
Location: Maryland USA
Posts: 3,220
Tempered.

Did you ask your buddy how much for low iron glass?

Sean

Aquascape? I'm a crypt farmer.

It's a fine line between fishing and standing on the shore looking like an idiot.

That IS an aquascape, it's titled "The Vacant Lot".
SCMurphy is offline  
post #3 of 12 (permalink) Old 06-14-2005, 04:34 PM Thread Starter
Got wood???
 
Badcopnofishtank's Avatar
 
PTrader: (208/100%)
Join Date: Jan 2004
Location: Northern Arizona
Posts: 1,094
He didnt know what low iron meant. The rest of the tank is regular non-tempered, will it make a lot of difference?


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Badcopnofishtank is offline  
 
post #4 of 12 (permalink) Old 06-14-2005, 05:15 PM
PT Biologist
 
SCMurphy's Avatar
 
PTrader: (4/100%)
Join Date: Oct 2003
Location: Maryland USA
Posts: 3,220
Starphire Ultra clear glass

Tempered is just a good idea for a big tank. If you don't want it, don't let your kids near the tank. Especially little guys swinging toys.

Sean

Aquascape? I'm a crypt farmer.

It's a fine line between fishing and standing on the shore looking like an idiot.

That IS an aquascape, it's titled "The Vacant Lot".
SCMurphy is offline  
post #5 of 12 (permalink) Old 06-14-2005, 06:23 PM
Planted Tank Guru
 
scolley's Avatar
 
PTrader: (11/100%)
Join Date: Apr 2004
Location: connecticut
Posts: 3,279
Be careful with the tempered glass! I have no idea about whether that is used on very large tanks. I do know it's a lot stronger.

But I also know that while non-tempered glass might crack slowly, and might give you a bit of time to fix a bad problem, tempered only fails catastrophically, and all within a span of a fraction of a second.

So for the extra strength, you trade the possibility that a failure might only be a slow moving crack vs. the certainty of losing 240 gallons all within, oh... 2 seconds or less.

I suppose it is a question of "how fast will a tank empty if the front glass just instantly disappears?" - definately watch the "swinging toys"!

Steve - 33g reef and a 180g planted in need of a re-scape.

Last edited by scolley; 06-15-2005 at 12:30 AM.
scolley is offline  
post #6 of 12 (permalink) Old 06-15-2005, 05:46 AM Thread Starter
Got wood???
 
Badcopnofishtank's Avatar
 
PTrader: (208/100%)
Join Date: Jan 2004
Location: Northern Arizona
Posts: 1,094
I think tempered is baked somehow to make it stronger but more brittle. I think we may have to be exact on the measurements then since I don't think you can cut it down to size.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Badcopnofishtank is offline  
post #7 of 12 (permalink) Old 06-15-2005, 05:56 AM
Planted Tank Obsessed
 
Curare's Avatar
 
PTrader: (0/0%)
Join Date: Sep 2004
Location: Fremantle, Western Australia
Posts: 376
Send a message via MSN to Curare
That's true
once you temper green glass, it's done. you cant cut it, or mess with it any way or it will shatter.

And Scolley's right, it'll shatter in a big way.

We've recenly had a set of curved windscreens custom made for one of our boats, (I'm a marine designer) and you can mess with the glass pretty well while it's still green. cut it, bend it, drill it, etc. but once it's tempered. It's fixed in stone.



...or glass as the case may be.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Like drops of fertiliser into the tank, so are the days of our CO2...
Curare is offline  
post #8 of 12 (permalink) Old 06-25-2005, 08:30 PM
Guest
 
PTrader: (0/0%)
Join Date: Jun 2005
Posts: 5
I would personally go with the non-tempered glass.. I dont like the idea of it shattering or not being able to cut it..
greenmagi is offline  
post #9 of 12 (permalink) Old 06-25-2005, 09:09 PM
Planted Tank Guru
 
scolley's Avatar
 
PTrader: (11/100%)
Join Date: Apr 2004
Location: connecticut
Posts: 3,279
For the record, I'm not suggesting non-tempered glass. Nor am I suggesting tempered. I don't know the first thing about common practices for tanks that large. For all I know, the extra strength may be considered important enough to risk the catastrophic failure.

All I wanted to do is point out that if tempered glass is used, and if something bad happens, by default going to be as bad as it could possibly get.

Steve - 33g reef and a 180g planted in need of a re-scape.
scolley is offline  
post #10 of 12 (permalink) Old 06-26-2005, 02:35 AM
Are these real?
 
Wasserpest's Avatar
 
PTrader: (195/100%)
Join Date: Jun 2003
Location: Monterey, CA
Posts: 15,635
I imagine that non-tempered glass will break just as quick. 240 gal, that's a lot of pressure, and while on a 10 gal tank a crack might develop slowly, with that much water behind it I think it will be a similar 2 second experience. (No I don't want to see either event).

My 100 gal tank has a tempered bottom, and my assumption is that the sides are non-tempered.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Wasserpest is offline  
post #11 of 12 (permalink) Old 06-26-2005, 03:20 AM
Planted Tank Guru
 
scolley's Avatar
 
PTrader: (11/100%)
Join Date: Apr 2004
Location: connecticut
Posts: 3,279
Quote:
Originally Posted by Wasserpest
I imagine that non-tempered glass will break just as quick.
I'm only quoting the glass fabricators I've spoken to recently. But when we are talking about 1/2" glass, it may crack, and crack badly, you are just going to get water spraying out. Rapidly.

But when tempered glass goes, it explodes. It becomes not there. Because it instantly turned into 10 thousand little unconnected pieces.

IMO that's not the same thing.

Your mention of your tank, with a tempered bottom and normal sides is a case in point. (BTW - that appears to be a very typical configuration. The bottom where so much pressure is, but with little chance of serious impact, is often tempered. It's why I'm building my own tank - you can't drill bulkhead holes in that all too common tank configuration)

The tempering allow manufacturers to lower cost - high pressures are there, but the cost of tempering is lower than upgrading the bottom to a thicker glass. And for the same reasons, tempering the sides would lower the production cost even further - stronger and thinner (cheaper) glass on the sides!

But they don't do this. Why? I can only assume that because the risk of catastrophic failure from impact is so high, when you temper the sides too.

Steve - 33g reef and a 180g planted in need of a re-scape.
scolley is offline  
post #12 of 12 (permalink) Old 06-27-2005, 01:13 AM
Planted Tank Obsessed
 
Curare's Avatar
 
PTrader: (0/0%)
Join Date: Sep 2004
Location: Fremantle, Western Australia
Posts: 376
Send a message via MSN to Curare
I should also point out that tempered glass is far less ductile than green glass.

In other words, if the sides bow out on the tank, if the deflection is to great, it'll pop the glass quicker with tempered than with green glass.

Perhaps having a tempered bottom isn't a bad way to go, as usually the're shouldn't be any bowing, as most times it's fully supported.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Like drops of fertiliser into the tank, so are the days of our CO2...
Curare is offline  
Reply

Tags
None

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome