Is this correct for head loss
- Thread starter Brian-222
- Start date
- Tagged users None
92Miata
Valuable Member
I don't see anything about the physical head height/rise being calculated into the number.
That being said, yes, you're going to lose a ton of flow running 3000gph through 1" pipe.
That being said, yes, you're going to lose a ton of flow running 3000gph through 1" pipe.
Brian-222
Community Member
When I actually put in a reducer in the formula it gives me the answer of infinity for head pressure. I can only enter the size of the outlet reducer. I want to go from 1.25" pipe from the outlet on that pump design to 1.00" just before entering the display tank with reducer to one inch just before predrilled one inch hole in tank. I'm so confused, any help would be appreciated.
Brian-222
Community Member
Here's what I actually get when entering the number of reducers just before display tank. With the pipe being increased for that pump recommendation. So confused, any help would be greatly appreciated.
Attachments
92Miata
Valuable Member
Why are you trying to push 3000gph through a single 1/4" orifice?
Either something is screwy with that calculator, or it thinks what you're tying into it is different than what you think you're trying to do.
What are you actually trying to do here?
1. What is the difference in height between the resevoir the water is coming from, and where its going to (surface of the tank to surface of sump?)
2. What is the pump?
3. What is the desired flow?
Either something is screwy with that calculator, or it thinks what you're tying into it is different than what you think you're trying to do.
What are you actually trying to do here?
1. What is the difference in height between the resevoir the water is coming from, and where its going to (surface of the tank to surface of sump?)
2. What is the pump?
3. What is the desired flow?
Brian-222
Community Member
1. 7 feet from the resevoir to surface of tank. 2. Pump is Vectra L2 3. My desired flow is 1500 gallons per hour after all head loss. It will have 1.25" pipe reducing from output on pump to 1.00" because of predrilled holes on the tank, 1 gate valve, 1 ball valve, 1 T branch and 2 90's. Thank you for your help so far from a newbie!
92Miata
Valuable Member
The biggest thing here is usually what essentially is friction - higher velocity water moving through a pipe causes more sheer and back pressure in a non-linear way - and pipe size (and length) has a way bigger effect on this than momentary restrictions like valves (think of a valve as basically a narrow piece of pipe thats very very short). You'll have a high velocity area at the valve - and this will cause some loss - but its nowhere near as bad as running, say, 10 feet of 3/4" pipe where you've got a ton of surface area exposed to really high velocity.
Its tough to calculate this stuff - you'll get more flow if you T off earlier (because you have lower velocity in each branch)- But I'm getting about 12' of head at 11ft/s in the main trunk - which judging by Ecotech's tiny little flow chart on their website puts you somewhere in the little-bit-over-1000gph range. If you go to 1.5" sched 40 in the main trunk - you drop to 8ft/s and about 9 ft of head. That gets you way closer to 1500 (I think, tiny chart)
92Miata
Valuable Member
I wouldn't.
You can't reasonably push 1500 gph through 8+ feet of 1" plumbing without a ton of pressure. Don't worry about the momentary restriction at the tank - its not going to make a big difference - but you need to run larger plumbing for that long run.
You can't reasonably push 1500 gph through 8+ feet of 1" plumbing without a ton of pressure. Don't worry about the momentary restriction at the tank - its not going to make a big difference - but you need to run larger plumbing for that long run.
Brian-222
Community Member
Ok thanks, but can I reduce it just before going into display from 1.25" to 1" before predrilled tank holes traveling 2' of rise to exit of top of tank and still be ok? Or, does it have to be 1.25" all the way up?
Run the larger diameter pipe along as much of the pipe run as possible and reduce it as close to the inlet as possible. The more larger diameter pipe you have along the run, the less friction and thus more throughput.
Ideally, it would be the 1.25" right the inlet, and reduced at the bulkhead
