Pressure gauge reading at hight elevation 1

[johngladstone]

Hi folks

If we get water pump work at sea level it's suction and discharge pressure is 10 psi , 55 psi

Then we take this pump for same system configuration at elevation 800 meter pumping same fluid

How much will be suction and discharge pressure in this case ??

What is equation use to take elevation in consideration and it's effect ??
Thank you in advance

Be
John

 

[LittleInch]

You again!

So long as the inlet pressure is still 10 psi then the discharge will be 55 psi

Note they might be some very small change in pressure as it's realative to atmosphere but at those numbers you won't notice.

A little diagram might help?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[electricpete]

Is part of the system open to atmosphere?

If so I'd think there would be minor decrease in absolute pressures but no change to dp or flow (except the unlikely event that NPSH conditions were marginal and unfavorably affected by the tiny change in absolute pressure).

=====================================
(2B)+(2B)' ?

 

[1503-44]

If open to atmosphere, your NPSHA will reduce by appx 1 psia than when at sea level.
Therefore your discharge pressure will also be 1 psia lower than when at sea level.
If your discharge pressure gage reads 100psig at sea level (we know that means 115 psia), it will still read 100 psig at 800m, but we know it will mean 114psia there. because suction pressure dropped by 1psia, but the gage will still read 100 psig, because the air pressure is also 1 psi lower.

If closed to atmosphere, your discharge pressure gage will read 100 psig at sea level, but 101 psig at 800m, but that discharge pressure will be 115 psia in both cases, because it does not depend on atmospheric pressure. If a closed system, suction pressure also does not depend on atmos pressure, so that will be the same at sea level and 800m, as was discharge pressure, but your gage will tell you it is 1 psi higher.

Use the "Standard atmosphere" to calculate those things.
TEMPERATURE

PRESSURE (Table has no picture)

https://www.engineeringtoolbox.com/standard-atmosphere-d_604.html

 

[horacio Torres]

Why are you concerned about that pump elevation change, the inlet pressure change is too low, minimal.


Horacio

https://www.linkedin.com/company/lagotuy/

 

[1503-44]

It matters to NPSHA when you get higher with hot gasoline.

 

[LittleInch]

The question isn't very clear John as to what you actually mean. Can you elaborate a bit please?

The biggest impact is reduction in air pressure.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[johngladstone]

Hi little inch

Thank you gentelmen for your inputs

I looking to know the effect of elevation on pressure gauge reading install on equipment ( pump ) pumping water or another fluid

John

 

[1503-44]

Now you know.

 

[Artisi]

At least there was a thank you, a lot more than you get from many others.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[1503-44]

Yes. I think on the average, only about 10 to 15% are courteous enough to do that simple thing. You'd think it cost money or something. I heard a lot more thank yous when I lived in London than anywhere else (in the nine countries I worked long term in). 2nd most popular words in UK; next to "sorry".

 

[Compositepro]

On the other hand, I find it is a waste of my time, and that of hundreds of other readers, to open a post that simply says thank you. These forums are not private conversations.

 

[1503-44]

Pretty high value there, if you can't take time to read a thank you.
Dont know about you, but I dont get paid no matter what the thread says. I'd just as soon it be that.

Oh. Sorry. I guess I wasted your time with this one.
Just as well. You wasted my and all the other's time with yours.

 

[Compositepro]

You have been doing that a lot lately. But overall I think you make a positive contribution. It would be nice if you focused on that.

 

[1503-44]

Thank you!

The feeling is mutual.

 

[johngladstone]

Thank you very much

I appressiate for you

It is my honour to join this team