Choke down ?

[randyadammartin]

Now onto the actual question. Spears doesn’t make a 2 1/2” gate valve which I wish to use with a rather large 300 gallon tank. They do offer a 2” however. This is to be the primary drain. The ID is 0.44 of an inch between the 2 1/2” and 2” . Am I really going to need that extra ID the larger pipe for this much water ? I want at the very least 3 times water turn over for hour.

 

[MartyK]

You don't need 2" pipe for 900 gallons per hour unless you have some very long pipe runs to a remote sump. So, yes, 2" will be just fine and so would 1.5" or even 1", if you want to save some extra money.

 

[randyadammartin]

What if I wanted 8x turn over per hour on a 300 gallon tank, or 3800 gallons an hour?

 

[Sisterlimonpot]

What if I wanted 8x turn over per hour on a 300 gallon tank, or 3800 gallons an hour?

Seeing that 105g per second (6300 gph) can flow through a 2.5" pvc pipe. 8x is acceptable

 

[MartyK]

Yeah 3800 gph would benefit from 2" pipe with minimal head loss. The 1.5" pipe would be marginal and have too high of head loss for my liking.

 

[JayM]

Spears does make a 2.5” gate valve, but they’re start at about $1000 each depending on where you buy it.

2.5” gate valve

 

[randyadammartin]

Spears does make a 2.5” gate valve, but they’re start at about $1000 each depending on where you buy it.

2.5” gate valve

Ouch yeah and the 2” is 133.00 lol . O.44 ID justifies 867 dollars more. No’maam.

 

[randyadammartin]

I shall buy the 2” spears.