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http://indianaquariumhobbyist.com/community/ :: View topic - 4 Feet rimless/braceless tank bowing out
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4 Feet rimless/braceless tank bowing out

 
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RTGRTG
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PostPosted: Wed Apr 08, 2015 1:52 pm Post subject: 4 Feet rimless/braceless tank bowing out Reply with quote

 Hi,
 
 I  built  a  4'  X  1.5'  X  1.5'  tank  using  5  mm  float  glass.  After  letting  it  to  cure  for  couple  of  days,  I  filled  it  up  yesterday.  As  the  water  level  began  to  raise,  the  front  and  back  panel  started  bowing  out  at  the  top.  With  the  tank  completely  filled,  both  the  panels  are  bowing  out  close  to  7  mm.
 
 Its  been  over  12  hours  now  and  there  hasn't  been  any  leak  and  the  tank  seem  to  be  holding  together.  But  the  bulging  top  is  worrying  me.  If  I  leave  it  filled  for  couple  of  days  more  and  it  still  holds  together,  will  it  be  safe  to  use?  
 
 I  really  like  the  look  of  open  top  brace  less  tank,  but  if  this  is  just  an  accident  waiting  to  happen,  I  will  go  ahead  and  add  the  braces...
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Devarajan
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PostPosted: Wed Apr 08, 2015 2:00 pm Post subject: Re: 4 Feet rimless/braceless tank bowing out Reply with quote

 5mm  for  your  dimension  looks  very  less,  generally  8  would  have  been  better,  there  are  glass  thickness  calculators  on  net  may  be  u  can  get  some  idea  there
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immu
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PostPosted: Wed Apr 08, 2015 2:01 pm Post subject: Re: 4 Feet rimless/braceless tank bowing out Reply with quote

 5  mm  is  too  thin  even  with  braces.  Suggest,  you  employ  braces  and  keep  water  level  up  to  15  inches  only.
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RTGRTG
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PostPosted: Wed Apr 08, 2015 2:49 pm Post subject: Re: 4 Feet rimless/braceless tank bowing out Reply with quote

 Thanks  for  your  reply.  I  did  use  an  online  glass  thickness  calculator  http://www.garf.org/tank/buildtank.asp.  It  suggested  a  glass  thickness  of  1/4"  but  along  with  front  and  side  braces.  
 
 I  thought  I  could  get  away  using  a  glass  of  5  mm  thickness.  I  wanted  to  keep  the  glass  as  thin  as  possible  because  the  greenish  tinge  increased  with  glass  thickness...  
 
 I  will  go  ahead  and  add  the  braces  tonight.
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josyjames
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PostPosted: Wed Apr 08, 2015 2:50 pm Post subject: Re: 4 Feet rimless/braceless tank bowing out Reply with quote

 5mm  is  not  sufficient.  You  tank  can  crack  at  any  time.
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mistryde
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PostPosted: Wed Apr 08, 2015 4:28 pm Post subject: Re: 4 Feet rimless/braceless tank bowing out Reply with quote

 Brace  yourself  for  flooding.  It'll  Crack  any  moment.   Try  braces  at  the  top  and  don't  fill  it  to  the  top,  it  might  survive.  Best  will  be  use  it  as  a  Paludarium.
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garothmaan
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PostPosted: Wed Apr 08, 2015 5:50 pm Post subject: Re: 4 Feet rimless/braceless tank bowing out Reply with quote

 5mm  is  very  thin  for  4feet  tank  No Way  
 
 
 
 its  very  dangerous   Banned
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Preeths
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PostPosted: Wed Apr 08, 2015 6:37 pm Post subject: Re: 4 Feet rimless/braceless tank bowing out Reply with quote

 You  will  need  at  least  10  MM  for  18  inch  high  tank  which  is  4  feet  long.  The  tank  will  crack  at  any  moment.  Remove  the  water  and  return  it  if  possible.  The  other  alternative  is  to  use  it  as  a  reparium/terrarium.  Fill  it  only  half  way  with  water  and  make  some  sort  of  emmersed  setup.
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Mortis
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PostPosted: Wed Apr 08, 2015 7:02 pm Post subject: Re: 4 Feet rimless/braceless tank bowing out Reply with quote

 If  you  want  to  go  rimless  and  braceless  on  a  tank  of  those  dimensions  then  nothing  less  than  12mm  will  do.  10mm  is  ok  but  with  braces.
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SKPKRISH
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PostPosted: Wed Apr 08, 2015 7:05 pm Post subject: Re: 4 Feet rimless/braceless tank bowing out Reply with quote

 Hi,
 
 I  made  the  same  mistake.  Only  glass  was  6mm  15  yrs  back.  First  remove  water
 
 You  can  convert  this   into  a  paludarium  or  split  the  tank  into  2  portions.  You  will  have  2  tanks  of  2  ft  len.
 
 You  may  have  to  go  for  a  new  glass  with  10mm  or  12  mm.  Maybe  you  may  have  fund  crunch.....  can't  say.
 
 Krishna
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RTGRTG
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PostPosted: Wed Apr 08, 2015 7:45 pm Post subject: Re: 4 Feet rimless/braceless tank bowing out Reply with quote

 I  had  purchased  the  glass  last  year,  two  identical  sets  in  fact.  So  returning  it  is  not  an  option.  I  had  built  one  for  my  cousin  at  that  time  but  it  didn't  survive  his  relocation;  the  tank  was  never  used.  Might  have  been  a  blessing  in  disguise  seeing  how  hazardous  it  could  have  been.  Paludarium  sounds  like  a  good  idea,  I  never  considered  it.
 
 Its  a  shame  really,  except  for  the  bowing,  the  tank  looks  good  otherwise.  I  will  add  the  brace  tonight  and  see  how  it  holds  up.  Thanks  for  your  support.
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RTGRTG
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PostPosted: Thu Apr 09, 2015 6:54 pm Post subject: Re: 4 Feet rimless/braceless tank bowing out Reply with quote

 I  am  going  to  convert  this  into  a  sealed  top  (fluval  edge)  design  with  a  raised  rectangular  opening  for  water  changes  and  maintenance.  With  the  top  glass  adhering  to  all  four  walls  of  the  tank,  any  bowing  issue  should  be  eliminated.
 
 Other  than  making  the  maintenance  more  difficult,  do  you  see  any  other  potential  issues?
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Mortis
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PostPosted: Fri Apr 10, 2015 12:46 am Post subject: Re: 4 Feet rimless/braceless tank bowing out Reply with quote

 It  wont  help  much.  There  will  still  be  strain  in  the  centre  portions  and  also  the  wight  of  the  top  glass  will  add  to  the  strain.  Better  to  cut  the  glass  and  make  2  tanks
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RTGRTG
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PostPosted: Fri Apr 10, 2015 10:31 pm Post subject: Re: 4 Feet rimless/braceless tank bowing out Reply with quote

 Thanks  for  your  comments  Mortis.  Two  feet  will  be  too  small.  I  also  considered  the  paludarium  idea  some  of  the  other  members  here  had  suggested  but  decided  against  it.  I  went  ahead  and  sealed  the  top  of  the  tank.  It  doesn't  bow  any  more,  but  performing  regular  maintenance  is  going  to  be  extremely  difficult.
 
 This  is  what  the  tank  looks  like  now.
   
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