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#1
05-27-2012, 10:47 PM
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You're welcome.
 It is unlikely that you could fit a 1" bulkhead in a hole that is drilled for a 3/4" bulkhead unless some weird size was drilled. That is just really unlikely. Since the tank is already drilled with a 3/4" bulkhead installed you may as well use it. One thing you can do is make sure that thin-walled PVC was used rather than thick-walled (SCH40) PVC. Using thin-walled PVC will give you a slightly larger internal diameter of the pipe and therefore allow a slightly higher flow. Just take the pipe size into account when figuring out head loss. I wouldn't change the 3/4" loc-line. You won't find 1" loc-line because it is not made. 
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#2
05-28-2012, 12:25 AM
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The 3/4"bulkhead won't make a difference. The head loss resulting from smaller pipe is from friction alone so that 50gph loss you're seeing is purely from the extra friction from the length of all the pipe and fittings. Increasing the pipe and fittings to 1"will still give you the same gain despite the bulkhead at the end staying at 3/4", this will only act as a nozzle increasing velocity but flow rate for the most part will be unaffected. I should add I agree the pump is a bit small, personally I like to run larger return flow rates to cut back on the need for supplemental from powerheads.
Last edited by sphelps; 05-28-2012 at 12:35 AM.
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#3
05-28-2012, 12:49 AM
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What Steve says is true, but I wouldn't bother changing the size of the pipe. It's already there, may as well use it. Unless it is plumbed weird. If it makes the difference between on size pump and the next size up then I would definitely change it.
 Last edited by Myka; 05-28-2012 at 12:51 AM.
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#4
05-28-2012, 01:35 AM
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Well, latest inteligence shows (while testing the plumbing) that I should not become a plumber. I have one joint leaking in that line . . . so, I quess that I will increase it to a 1" line and maintain the 3/4" bulkhead, which if I understand what is being said, will not signifianctly decrease the flow, but only increase the velocity. So, I will now get my brother in law plumber over to do it correctly.
 Thanks to everyone for the help and advice on this seemingly never ending challenge of getting water into the tank.
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