Diver Posted March 29, 2005 Report Share Posted March 29, 2005 Hi, I’m about to get some holes drill in my tank to add a chiller and to add a squid to my setup. What size should I make the holes. The squid is the return from the overflow and I think it is about 3000lt, the chiller will be about 400lt. I want to get sizes that will make it easy to get plumbing parts for and not restrict the flow. TIA, Diver Quote Link to comment Share on other sites More sharing options...
chimera Posted March 29, 2005 Report Share Posted March 29, 2005 scwd is only 3/4" (20mm) from memory? i would still make the holes 1" (25mm). do the same for the chiller, you can always restrict the flow by adding reducers - but I would not even bother with that. I would go 25mm for all of them. Quote Link to comment Share on other sites More sharing options...
suphew Posted March 29, 2005 Report Share Posted March 29, 2005 Go as big as you can with-in reason, you cant redo a hole and it is easy to reduce the plumbing to suit the device, remember also that the bulkhead takes up alot of the hole. can't remember the numbers but eg a 35mm hole once bulkhead is added will only leave you 25mm hole. I would go for 35-40mm at least, that way if you want to T off water to a sump or drain etc you can do it without adding another hole. Your Squid hole can be what ever you 25mm(?) bulkhead needs which I think will be 32mm. Remember also that volume of water through a hole is a squared factor, i.e. 2 x 25mm hole dont equal 1 x 50mm hole, in fact far from it. Quote Link to comment Share on other sites More sharing options...
Pies Posted March 29, 2005 Report Share Posted March 29, 2005 Having done this a few times with SCWD here is what I would do. I would use 15 or 20mm for the SCWD inputs, NO VALUE in going larger. I would reccomend using it as a closed loop, not as part of the sump return, this is how we modded my old tank (bellow) for Suphews setup. Lots of positive reasons to do it this way. Check this thread for how I built it: http://www.fnzas.org.nz/fishroom/viewto ... 95&start=0 Pies Quote Link to comment Share on other sites More sharing options...
chimera Posted March 30, 2005 Report Share Posted March 30, 2005 I would use 15 or 20mm for the SCWD inputs, NO VALUE in going larger Disagree. Go larger and you can always reduce it. What happens if the SCWD/pump combo does not do the job you want and you want more flow? Waste of time and money. Go 25mm and get Hansen reducers - at least it allows for change/expansion in the future. Quote Link to comment Share on other sites More sharing options...
Diver Posted March 30, 2005 Author Report Share Posted March 30, 2005 I assume that you mean 25mm hose diameter so the hole I need to get drilled will be 32mm to allow for the bulkhead. Cheers, Diver Quote Link to comment Share on other sites More sharing options...
chimera Posted March 30, 2005 Report Share Posted March 30, 2005 yes. what size is your tank? the only exception to the above (going 25mm) would be if the tank was 3 foot or smaller. if it were, I would opt for 20mm piping as there is THEN no value in going larger. Quote Link to comment Share on other sites More sharing options...
Diver Posted March 30, 2005 Author Report Share Posted March 30, 2005 The tank size is 1400mm, also it is not a reef tank it is a native marine so don't think I need the real high turn over of a reef tank. Quote Link to comment Share on other sites More sharing options...
chimera Posted March 30, 2005 Report Share Posted March 30, 2005 for the size, 25mm, for the type, 20mm Quote Link to comment Share on other sites More sharing options...
Pies Posted March 30, 2005 Report Share Posted March 30, 2005 Disagree. Go larger and you can always reduce it. What happens if the SCWD/pump combo does not do the job you want and you want more flow? Waste of time and money. Go 25mm and get Hansen reducers - at least it allows for change/expansion in the future. Plumbing advice from Chimera... Pies j/k Quote Link to comment Share on other sites More sharing options...
chimera Posted March 30, 2005 Report Share Posted March 30, 2005 Quote Link to comment Share on other sites More sharing options...
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