Recent content by ebermudez

Since the curve of NPSHa that i determined is below the NPSHr, how could that pump be working over that condition of cavitation??? I was reading about NPSH reduction for hydrocarbon liquids and hot water applications, and because the sheets provided by the manufacturer are made for cold water...

i have the performance correction chart, if you need it i could mail it to you!. Just let me know EB

Artisi, howelse could the gas entrain?....as well as vortexing. Thanx for your interest EB

Artisi, yes it is the same pump. I made the previous question about the impeller diameter, in order to estimate operation flow value, because i had the fabricant charts, but the nameplate on the pump wasnt legible to see the impeller diameter and choose from one of the diameters/specific...

I've already plotted both curves. Considering the worse condition -> Ho = Hvp ....(NPSHa= Ho - Hvp +/- Z - hfs), the vapor pressure = pressure inside the vessel. At that critical condition the NPSHa would never be greater than NPSHr according to the provided NPSHr curve, can I assume that the...

Generally NPSH values given in the performance curve sheets are measured values which correspond to a loss of discharge head of 3%. The total heads and the performance characteristic shown on these curves, apply to media with a density of 1 kg/dm3 and a kinematic viscosity up to 20 mm2/s. If the...

My boss told me to plot a NPSHa curve on the fabricant NPSHr chart, what information could give me both curves together? We're analyzing this pump, beacause it's causing much troubles, apparently due gas appearance. We are pressuming vortexing, though my boss wanted to check the NPSH. I will...

'Cause I think the impeller had been altered already.

Thank you all for your support!. Electricpete, your suggestion kept my boss' attention, thats what he was looking for,he was testing me on that!

I dont get your point![ponder], would you explain me the operating at shutoff, and how could I measure head in that condition. What do i need to review to make sure i dont ge to damage the equipment. Im a new grad, im trying to learn all this, and also trying to get my job done. Thanx for your...

I have my pump's curve from a KSB -RPK/HPK-Y pump, and i've already plot my system curve, but I dont know and havent found the actual impeller width of my pump. I dont know if it has been modified in any way. In order to get the operation point of the system, I need to know the impeller diameter...