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Old 11-11-2012, 04:58 PM   #1
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Picked up a RR tank with small drain tube..solutions?

A guy in staten island was giving away his 65g reef ready tank because his house was patially flooded. I ended up picking it up from him and cleaning it up. I noticed it has only 1inch drain tube with a 3/4inch return.

My question is that i have a mag9.5 pump and i was wondering if its going to be too strong for a 1inch drain tube to handle. I know i can place a ball valve on it, but would the pressure restriction wear out the pump sooner??

After 2hrs of cleaning/scrubing



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Old 11-11-2012, 06:57 PM   #2
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Looks good! Your mag 9.5 will probably be able to push more than the drain can handle, but it won't hurt anything to restrict the outflow a bit. It is restricting inflow that can lead to cavitation and premature wear on a pump.
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Old 11-11-2012, 07:17 PM   #3
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For some reason, most RR tanks use 1" drains. Makes no sense to me. I've read time and time again that restricting the outgoing flow from the pump does no harm, some people even argue it prolongs the pumps life and reduces power consumption.
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Old 11-11-2012, 09:11 PM   #4
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Quote:
Originally Posted by fort384 View Post
It is restricting inflow that can lead to cavitation and premature wear on a pump.
I didnt know that

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Originally Posted by mfdrookie516 View Post
For some reason, most RR tanks use 1" drains. Makes no sense to me.
You think its undersized??

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I've read time and time again that restricting the outgoing flow from the pump does no harm, some people even argue it prolongs the pumps life and reduces power consumption.
Im not an engineer or physicist but my thought process tells me that applying downward pressure to something that is coming up can cause wear and tear ....lol

on a side not some1 gave me the idea of converting the return tube into another drain tube and running the return to another part of the tank. Thoughts??
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Old 11-11-2012, 10:20 PM   #5
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It would make logical sense to me that it would be hard on them too... but I didn't see any issues in restricting the flow on mine for the short time it was up, and I've seen people post that they've restricted the flow for years on their pumps.

I do think the 1" drain is undersized. I ran a 1.5" drain on my 40b and had I kept it, would have likely drilled another as well.
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Old 11-11-2012, 10:21 PM   #6
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I have a single 1" drain on my 57, it does well. I have 2 mp10s to supplement flow in the tank.
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Old 11-12-2012, 05:40 AM   #7
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I have two, 1 inch drilled overflows and a single 3/4 inch return. I am using a rio3100 return that is majorly overpowered for the system. I have 4 feet of head pressure as well. I have my ball-valve dialed down to almost half restriction. My pump is good so far at 2 years of operation.

Not that it is relevant, however, my tank is only a seaclear 30g with a 20g sump.
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Old 11-12-2012, 08:13 AM   #8
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I'm going to give my input here and go back to the basic question here of how many gph's you are trying to put through the sump. I just had 2 1" holes and a 1/2" hole drilled into my 75. 1 of the 1" is only a backup in case the other gets clogged. I am only going to be pushing 300 gph through my sump with an Eheim Compact plus 2000. I am a believer in slow flow through a sump, so a 1" hole is more than enough for me... If you for some reason want 900 gph going through your sump, then it may not cut it. And a ball valve wont do any real damage to your pump, as they are designed around head pressure...
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Old 11-13-2012, 10:42 AM   #9
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Quote:
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I have a single 1" drain on my 57, it does well. I have 2 mp10s to supplement flow in the tank.
Its not the circulation inside that worries me, its the return pump pressure vs the drain tube size that worries me.

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I have my ball-valve dialed down to almost half restriction. My pump is good so far at 2 years of operation.
encouraging statement that makes me want to get a ball valve now

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I'm going to give my input here and go back to the basic question here of how many gph's you are trying to put through the sump. I just had 2 1" holes and a 1/2" hole drilled into my 75. 1 of the 1" is only a backup in case the other gets clogged. I am only going to be pushing 300 gph through my sump with an Eheim Compact plus 2000. I am a believer in slow flow through a sump, so a 1" hole is more than enough for me... If you for some reason want 900 gph going through your sump, then it may not cut it. And a ball valve wont do any real damage to your pump, as they are designed around head pressure...
To answer ur question, i want the use of the full pressure of about 700gph (950 pump with a 4ft head) to use as part of the circulation inside the tank

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And a ball valve wont do any real damage to your pump, as they are designed around head pressure...
Makes sence now that you state it like that. I guess a ball valve will be the same back pressure as having a taller head #
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Old 11-13-2012, 10:52 AM   #10
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I have 1' pipe on my tank and it works fine with a tuned down mag 5...im at work so i think it's a 5...
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