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Hello Does anyone know an equation to calculate the flow leakage through clearances between wear rings?? Thank you

ok, I agree with you. But I meant something different. Let's suppose there are two tubes lengthening 2ft. The first tube is filled up with a fluid in a known temperature. The second tube is also filled up with the same fluid, but in a lower temperatur (let's suppose 47ºF lower compared to the...

But the difference in density of the fluid changes very little along with the change in temperature. And even if we consider this difference in density and a weight of column of 2 feet, the system would get very little head from thermoshyphoning. Two 90-degree bend may be enough to overcome this...

hello According to API 682 (shaft sealing systems for centrifugal pumps), the API plan 23 requires the heat exchanger to be placed some high above the mechanical seal in order to provide thermoshyphoning, what would help the pump ring to delivery head to make the sealing system work. Although...

What BigInch said is completely right. I just would like to emphasize that the first topic he mentioned is the one which contributes the most to the best efficiency of a pump. Depending on the outlet triangle velocity and the diffuser geometry, the BEP can be estimated, but only confirmed after...

hello I'm facing a situation at work with heat exchanger in a pump sealing plan. It's a coil heat exchanger, wich runs with fluid to be cooled at 260ºC (500°F) in the coil and water at 25ºC (77ºF) at the shell. But it doesn't even last 3 weeks running properly. There's always a hole that...

micalbrch's absolutely right. Theoretically, if you choose to fill the tank by the its bottom, it will consume less power than if it was filled by the top. As we know, the operation point is at the intersection of the pump curve with the system curve. Varying the level of the tank might or...

In a plan 11, it's recommended that you plug your tubing from discharge at the highest point of your seal's cartridge, so you can vent your pump at the start up.

DubMac, how do you measure the exit angle using a protractor ?

By trimming an impeller, its exit angle is changed a bit. I was wondering if this changing in the exit angle could be so great that the new head due to the impeller trimming would not follow the affinity laws anylonger.

If so, how can I do that?

Hello Is there any way I could measure the exit angle of an impeller?? Thank you!

bearing house showing wear patternhttp://files.engineering.com/getfile.aspx?folder=e197c651-9176-4cb0-bc8f-f341efbc1f1c&file=DSC04252.JPG

photo of the rotor attached to the conehttp://files.engineering.com/getfile.aspx?folder=40a3c2b6-79ee-430c-a6a9-5e8ff99eae42&file=DSC04239.JPG

photohttp://files.engineering.com/getfile.aspx?folder=25fcde7f-5d4a-4f7f-9716-4afa077d1a77&file=DSC04232.JPG

Actually this loss of vacuum in the process is not noticed immediatley by the operators. But it's already been studied the possibility of installing a switch pressure connected to the alarm. What we could see up to this moment in disassembling the equipment, is that bearing house from both...

Hello! In the process plant I work, we have a NASH luquid ring vacuum pump. It was working very well, until it suddenly locked up. We have been told by the operators that the pump operated for some time with no sealing luquid. When we opend the pump to see what was going on, we found that the...

Man, what kind of pump is it? A pistion pump, vane pump, gear pump, screw pump...? And one other crucial information is how much is the flow. I work as well with pumps in a refinery, and an elbow just before the suction flange can lead to turbulence and noise very easily. If the flow is high...