Centrifugal Pump Pressure

27" water column or 2'-3" = 1 psi.110 m = 360.888 ft/2.3=156.9 psi/14.5= 10.8 bar

sorry for duplication

For calculating pressure from the column head given we P=0.0981XhXSG, where h is head, for all practical purpose SG for water =1, h=110mtr.(given),

Therefore P= 0.0981X110X1 = 10.791 bar or 10.8 bar.

GA

Therfore, for the answer: This pump will have a static pressure higher than 110m if the name plate shows a flow at 110m (Which is the normal way they specify...).

It doesn't matter whether the pump is pumping water or any other common fluid.

It denotes differential head it can develop between suction and discharge. In a simple way 110 m head is equal to 11 kg/cm2 so it is roughly 11 bar (more exactly 11x0.981=10.79 bar).

Dear Ralish,

The answer is YES and You are right.

I want to supplement to the posting by Mr. Slack (No.8 here) the Head is INDEPENDENDAT of the QUANTITY of fluid or liquid and varying density is pumped.

If the density of the fluid is higher than water, the power demand by the pump will go up and vise versa.

Thanks,

RAJESWARI.

Partially true.

For the same rpm, since a higher viscosity will reduce bypass leaks within the pump (and vice-versa), and this will allow, with a suitable power input and the same rpm, you will get higher pressures (or lower) .... friction losses will also come in. Therefore, it is not as simple. Let us stick to a particular fluid an compare like for like to make it an easier response ... (?).

Yes, 110m is nearly equivalent to a pressure of 11 bar for water.

However, please be advised that it is the developed head which needs to be adjusted for the suction pressure to get the total head.

So if your suction is from a tank 10m high, the total head at pump dischage will be = 110 +10 = 120m or 12 bar.

It will <...roughly convert into a pressure of 11bar...> whatever the fluid (within bounds), actually.

Apart from the fact that this thread is 10 years old, that's not correct.

Assuming the 110m is generated head, it's not the same 11 bar whatever the fluid. For a fluid other than water, the generated head is still 110m fluid, but the pressure in e.g. bar is proportional to the fluid SG. Also the power drawn is proportional to the fluid SG, provided the motor is big enough, and no complications like a change in viscosity.

Earlier posters have made different assumptions about the 110m. I would want to know from the pump maker - is that closed valve head, or head at a specific flow, or maybe just the maximum casing pressure? Almost certainly the 110m is water, so if it is maximum casing pressure it's ~ 11bar, whatever the fluid.