does any know ratings for holes ?

steveo32 · 05/27/2006, 07:36 PM

Just wondering if any one knew the ratings for certain diameters such as i know a 1'' hole can take 600 gph but does this mean
a 2" hole can handle 1200 gph ? Or is there a chart ? thank you all for your help

iCam · 05/27/2006, 07:53 PM

If it's any other help aside from flow ratings (if it's not already drilled), here's a size chart:

1/2" Bulkhead 1 1/8" hole
3/4" Bulkhead 1 7/16"-1.5" hole
1" Bulkhead 1 3/4" hole
1 1/2" Bulkhead 2 3/8 ~ 2 1/2" Hole

Diamond Hole Saw size 60mm = 1.5 inch Bulkhead
Diamond Hole Saw size 45mm = 1.0 inch Bulkhead
Diamond Hole Saw size 38mm = 0.75 inch Bulkhead

I don't know about the flow ratings,though.

graveyardworm · 05/27/2006, 08:00 PM

Here's a drain calculator. http://reefcentral.com/calc/drain.php

xtrstangx · 05/27/2006, 08:03 PM

Based on a 1" pipe being able to handle 600 GPH (well known)... Area for a circle is πrÃ‚Â²

A 1" pipe has an area of .25π or .785

This means that a per .785 inchesÃ‚Â², you get 600 GPH.

So a 1.5" pipe has an area of .5625π or 1.76625... when you divide 1.76625 by .785, you get 2.25. The 2.25 is a multiplier so multiply it by 600 GPH. You get 1350 GPH

A 2" pipe has an area of π (1Ã‚Â²=1).. So 3.14 (roughly). 3.14/.785 is 4. 4 is the multiplier and you multiply it by 600 GPH.. That is 2400 GPH.

Pipe Flow Rate
1/2" 150 GPH
1" 600 GPH
1.5" 1350 GPH
2" 2400 GPH

Keep in mind this is purely mathematically and may be completely different in the real world.

Edit- Bulkheads! The hole size you need is based on what kind of bulkhead you use. If you haven't bought them already, here is a great site with cheap prices and they have the hole sizes.
http://savko.com/PartList.asp?pgid=2

Edit 2- Those pi's came out really bad... I they should be like this π

steveo32 · 05/27/2006, 08:16 PM

Well thank you much of the input is good but now i guess to celrify which would be best. The situtation is this: I have 180 gal tank that has one center overflow. The drain hole is 1". Now my pump will be located in the basement so I want to get a hammerhead to handle the head pressure. Now just by estimating the approximet head pressure is 20' so @ that height the hammerhead will pump 2400gph based on the chart provided by marine depot. Now with only that 1" drain I was thinking of boaring out the hole to 2" to handle more is this a good idea ? Or what should be done ? thank you

xtrstangx · 05/27/2006, 08:19 PM

On a 180g RR, chances are the bottom is tempered. If you try to drill it out more, you will risk shattering the bottom of the tank.

steveo32 · 05/27/2006, 08:22 PM

Yeah but its already drilled so that emans its drillable right ?

xtrstangx · 05/27/2006, 08:23 PM

Quote:

Originally posted by steveo32
Yeah but its already drilled so that emans its drillable right ?

No.. they drill it and then temper it.

graveyardworm · 05/27/2006, 08:25 PM

I think they drill it prior to tempering. The tank should have tag indicating whether its tempered or not. Otherwise you could contact the manufacturer.

xtrstangx · 05/27/2006, 08:30 PM

Quote:

Originally posted by graveyardworm
I think they drill it prior to tempering. The tank should have tag indicating whether its tempered or not. Otherwise you could contact the manufacturer.

Don't rely just on the tag though.

What brand is the tank?

steveo32 · 05/27/2006, 09:26 PM

its a custom built tank form brooklyn so i don;t really know i oculd contact the guy I got it from and see if he has any info on the maker but idk.

But if I can't drill it then what can I do to get more gph ?

xtrstangx · 05/27/2006, 09:32 PM

Contact the guy you bought the tank so you can get some details on it.

The only other idea is to drill a hole in the back and install an external durso but I don't know how well that will work with an overflow box

steveo32 · 05/27/2006, 09:38 PM

hmmmm

tkeracer619 · 05/27/2006, 09:49 PM

in the name of science I am going to go plug one of my two 1" overflows. Your comming over here if I flood to help mop.....

tkeracer619 · 05/27/2006, 10:15 PM

Quote:

Originally posted by xtrstangx
Based on a 1" pipe being able to handle 600 GPH (well known)... Area for a circle is πrÃ‚Â²

A 1" pipe has an area of .25π or .785

This means that a per .785 inchesÃ‚Â², you get 600 GPH.

So a 1.5" pipe has an area of .5625π or 1.76625... when you divide 1.76625 by .785, you get 2.25. The 2.25 is a multiplier so multiply it by 600 GPH. You get 1350 GPH

A 2" pipe has an area of π (1Ã‚Â²=1).. So 3.14 (roughly). 3.14/.785 is 4. 4 is the multiplier and you multiply it by 600 GPH.. That is 2400 GPH.

Pipe Flow Rate
1/2" 150 GPH
1" 600 GPH
1.5" 1350 GPH
2" 2400 GPH

Keep in mind this is purely mathematically and may be completely different in the real world.

Edit- Bulkheads! The hole size you need is based on what kind of bulkhead you use. If you haven't bought them already, here is a great site with cheap prices and they have the hole sizes.
http://savko.com/PartList.asp?pgid=2

Edit 2- Those pi's came out really bad... I they should be like this π

You left friction, pipe length, and gravity out of your equation. Tsk Tsk what would your fluids prof. say about this........

I just plugged one of my 1in drains......... It handled all my rio 17hf with ease. I estimate that was around 700gph or so including the head loss of the pump. It would probably handle upwards of 1000gph (a total stab in the dark) before friction would start to make it back up.

If you were to increase the pipe size after the bulkhead to say 1.5" pvc you would reduce this friction and your system would pull more water.

I'm sure if you get the length of pipes, number and type of bends, and ID of the pipe xtrstangx will do the calculations for you properly. He is in school and needs the practice not to mention a real world problem.

If not I can do it for you.

Love to engineers across the world

xtrstangx · 05/28/2006, 08:55 AM

tkeracer619... wish I had the time to do all that. I'll leave it up to you if you want to

But a 1" hole will gravity drain about 600 GPH.. It may be able to do more or less depending on any restrictions on the pipe. In any case, it is a good starting point.

RichConley · 05/28/2006, 09:22 AM

I was getting 1000+ through a 1"hole, no standpipe. Gravity, overflow depth, etc have a huge effect in this....

steveo32 · 05/29/2006, 08:39 AM

The pervious owner said he was using a dart on it w/ no problem but that was @ no head pressure cause it was under the stand.

But if I used a 1" durso and then opened the pipe up at the bottom to something bigger like 1.5 or 2" could this pull more water ? or should I just drill the side of the tank and make a second over flow ?

xtrstangx · 05/29/2006, 12:44 PM

Was the Dart on his return or is this as a closed loop?

The Dart would've lost a LOT of pressure from the head. It isn't really meant to handle that much pressure (even 4' of pipe and a 90Ã‚Âº elbow)

05/27/2006, 07:36 PM	#1
steveo32 Registered Member Join Date: Feb 2005 Location: new york Posts: 344	does any know ratings for holes ? Just wondering if any one knew the ratings for certain diameters such as i know a 1'' hole can take 600 gph but does this mean a 2" hole can handle 1200 gph ? Or is there a chart ? thank you all for your help

05/27/2006, 08:00 PM	#3
graveyardworm Registered Member Join Date: Nov 2003 Location: Nottingham, NH Posts: 7,251	Here's a drain calculator. http://reefcentral.com/calc/drain.php __________________ -David- President - New Hampshire Reef Club There’ll be no one to save, with the world in a grave Current Tank Info: 100 gal lagoon/seagrass, 100 gal sump, Lifereef 72" skimmer, 180 inwall, 125 inwall seagrass/lagoon in progress

05/27/2006, 08:25 PM	#9
graveyardworm Registered Member Join Date: Nov 2003 Location: Nottingham, NH Posts: 7,251	I think they drill it prior to tempering. The tank should have tag indicating whether its tempered or not. Otherwise you could contact the manufacturer. __________________ -David- President - New Hampshire Reef Club There’ll be no one to save, with the world in a grave Current Tank Info: 100 gal lagoon/seagrass, 100 gal sump, Lifereef 72" skimmer, 180 inwall, 125 inwall seagrass/lagoon in progress

05/27/2006, 09:49 PM	#14
tkeracer619 Registered Member Join Date: Jan 2006 Location: Westminster, CO Posts: 17,289	in the name of science I am going to go plug one of my two 1" overflows. Your comming over here if I flood to help mop..... __________________ Hobby Experience: 9200ish gallons, 26 skimmers, and a handful of Kent Scrapers. Current Tank: Vortech Powered 600G SPS Tank w/ 100gal frag tank & 100g Sump. RK2-RK10 Skimmer. ReefAngel. Radium 20k.

05/28/2006, 09:22 AM	#17
RichConley Registered Member Join Date: Sep 2004 Location: Bostonian in Chicago going to DC Posts: 9,908	I was getting 1000+ through a 1"hole, no standpipe. Gravity, overflow depth, etc have a huge effect in this.... __________________ NO TANKS!!!

05/27/2006, 07:53 PM	#2
iCam Window Seat Join Date: Feb 2003 Location: D/FW, Texas Posts: 4,135	If it's any other help aside from flow ratings (if it's not already drilled), here's a size chart: 1/2" Bulkhead 1 1/8" hole 3/4" Bulkhead 1 7/16"-1.5" hole 1" Bulkhead 1 3/4" hole 1 1/2" Bulkhead 2 3/8 ~ 2 1/2" Hole Diamond Hole Saw size 60mm = 1.5 inch Bulkhead Diamond Hole Saw size 45mm = 1.0 inch Bulkhead Diamond Hole Saw size 38mm = 0.75 inch Bulkhead I don't know about the flow ratings,though.

05/27/2006, 08:03 PM	#4
xtrstangx Premium Member Join Date: Mar 2005 Location: Shawnee, Kansas Posts: 4,568	Based on a 1" pipe being able to handle 600 GPH (well known)... Area for a circle is πrÃ‚Â² A 1" pipe has an area of .25π or .785 This means that a per .785 inchesÃ‚Â², you get 600 GPH. So a 1.5" pipe has an area of .5625π or 1.76625... when you divide 1.76625 by .785, you get 2.25. The 2.25 is a multiplier so multiply it by 600 GPH. You get 1350 GPH A 2" pipe has an area of π (1Ã‚Â²=1).. So 3.14 (roughly). 3.14/.785 is 4. 4 is the multiplier and you multiply it by 600 GPH.. That is 2400 GPH. Pipe Flow Rate 1/2" 150 GPH 1" 600 GPH 1.5" 1350 GPH 2" 2400 GPH Keep in mind this is purely mathematically and may be completely different in the real world. Edit- Bulkheads! The hole size you need is based on what kind of bulkhead you use. If you haven't bought them already, here is a great site with cheap prices and they have the hole sizes. http://savko.com/PartList.asp?pgid=2 Edit 2- Those pi's came out really bad... I they should be like this π

05/27/2006, 08:16 PM	#5
steveo32 Registered Member Join Date: Feb 2005 Location: new york Posts: 344	Well thank you much of the input is good but now i guess to celrify which would be best. The situtation is this: I have 180 gal tank that has one center overflow. The drain hole is 1". Now my pump will be located in the basement so I want to get a hammerhead to handle the head pressure. Now just by estimating the approximet head pressure is 20' so @ that height the hammerhead will pump 2400gph based on the chart provided by marine depot. Now with only that 1" drain I was thinking of boaring out the hole to 2" to handle more is this a good idea ? Or what should be done ? thank you

05/27/2006, 08:19 PM	#6
xtrstangx Premium Member Join Date: Mar 2005 Location: Shawnee, Kansas Posts: 4,568	On a 180g RR, chances are the bottom is tempered. If you try to drill it out more, you will risk shattering the bottom of the tank.

05/27/2006, 08:22 PM	#7
steveo32 Registered Member Join Date: Feb 2005 Location: new york Posts: 344	Yeah but its already drilled so that emans its drillable right ?

05/27/2006, 09:26 PM	#11
steveo32 Registered Member Join Date: Feb 2005 Location: new york Posts: 344	its a custom built tank form brooklyn so i don;t really know i oculd contact the guy I got it from and see if he has any info on the maker but idk. But if I can't drill it then what can I do to get more gph ?

05/27/2006, 09:32 PM	#12
xtrstangx Premium Member Join Date: Mar 2005 Location: Shawnee, Kansas Posts: 4,568	Contact the guy you bought the tank so you can get some details on it. The only other idea is to drill a hole in the back and install an external durso but I don't know how well that will work with an overflow box

05/27/2006, 09:38 PM	#13
steveo32 Registered Member Join Date: Feb 2005 Location: new york Posts: 344	hmmmm

05/28/2006, 08:55 AM	#16
xtrstangx Premium Member Join Date: Mar 2005 Location: Shawnee, Kansas Posts: 4,568	tkeracer619... wish I had the time to do all that. I'll leave it up to you if you want to But a 1" hole will gravity drain about 600 GPH.. It may be able to do more or less depending on any restrictions on the pipe. In any case, it is a good starting point.

05/29/2006, 08:39 AM	#18
steveo32 Registered Member Join Date: Feb 2005 Location: new york Posts: 344	The pervious owner said he was using a dart on it w/ no problem but that was @ no head pressure cause it was under the stand. But if I used a 1" durso and then opened the pipe up at the bottom to something bigger like 1.5 or 2" could this pull more water ? or should I just drill the side of the tank and make a second over flow ?

05/29/2006, 12:44 PM	#19
xtrstangx Premium Member Join Date: Mar 2005 Location: Shawnee, Kansas Posts: 4,568	Was the Dart on his return or is this as a closed loop? The Dart would've lost a LOT of pressure from the head. It isn't really meant to handle that much pressure (even 4' of pipe and a 90Ã‚Âº elbow)