Plumbing question - Page 2

Myka · #1 03-17-2009, 11:32 PM

Quote:

Originally Posted by Reefer Rob

Quote:

Originally Posted by Myka

A person will get less gph, but more psi at the end of a 1" pipe than using the same pump on a 3" pipe.

Put a pressure gauge at the end of each pipe and it will be the same.

No it won't be. The pump will be restricted by the decreased flow out of the end of the pipe...the same reason fittings on a pipe decrease pressure. Now, if you close the end of the pipe you would be right.

Reefer Rob · #2 03-18-2009, 01:04 AM

Quote:

Originally Posted by Myka

No it won't be. The pump will be restricted by the decreased flow out of the end of the pipe...the same reason fittings on a pipe decrease pressure. Now, if you close the end of the pipe you would be right.

I think you're getting confused. Decreasing the pipe diameter will increase back pressure at the pump, but I don't think you can use it to increase PSI at the outlet that way. Think of the applications for that kind of technology

Perhaps you're thinking of velocity? I'm not sure what that has to do with head pressure though, which is influenced by gravity, not a pump.

sphelps · #3 03-17-2009, 11:12 PM

Quote:

Originally Posted by Myka

I didn't say more pressure increases flow! Where do you see that?

Well you started off your post by saying you agreed with the fact that larger diameter pipe means more water weight and therefore less flow. Your next statement seemed to be your argument on why you agreed. Sorry for the confusion but I'm not a mind reader

Quote:

Originally Posted by oilfieldsafety

but by going to a larger diameter pipe won't you increase your head pressure due to weight of the water column and in fact decrease your flow?

Quote:

Originally Posted by fkshiu

You, sir, are correct!

Quote:

Originally Posted by Myka

I'm with fkshiun on this one! If you pump 500 gph through a 1" pipe you will get a lot more psi coming out the end than you will if that pipe was 4".

kari · #4 03-17-2009, 11:31 PM

You guys should listen to Sphelps on this matter or he may just go Bernoulli on you.

banditpowdercoat · #5 03-17-2009, 11:47 PM

Quote:

Originally Posted by kari

You guys should listen to Sphelps on this matter or he may just go Bernoulli on you.

Bernoulli, LMAO. Were not building plane wings here

sphelps · #6 03-18-2009, 01:48 AM

Quote:

Originally Posted by kari

You guys should listen to Sphelps on this matter or he may just go Bernoulli on you.

haha, only as a last resort

hillegom · #7 03-18-2009, 01:10 AM

If we take a 5" pipe and adapt it to a 3/4 opening in the pump, the weight of the water in the pump is only the area of the 3/4" opening times the weight of water. The rest of the weight, 4.5" will exert force on the adapter.
As sphelps says, use the calculater in the link above, as the pipe dia. increases, head pressure goes down.