Thanks for the response dcasto.
I agree about the carbon footprint. However the vendor produced a certificate from a third party testing facility certifying the claim (TUV). They claim the additional energy to exceed efficiency and heat losses lies within the latent heat of water. Therefore...
A colleague of mine is evaluating the benefits of installing a 200 kW, two stage, oil free, rotary screw air compressor with energy recovery. The energy recovery option recovers the heat of compression and released latent heat of water in the compressed air stream. This recovered energy would...
Can you give the manufacturer and model of the pump? I am having a difficult time visualizing the internal design.
Also, describe the failure (crack, shatter, shear, torque, etc.)
The conditions you list, are these actual at the time of failure or rated? The temperature really sticks out to me.
Hockeydad:
Sometimes removing the "acoustic enclosures" is a bad idea. Most compressors with enclosures are designed to run with the sides on. This channels the cooling air through the coolers. Removing the enclosure doors could be reducing the flow of cooling air through the coolers.
You...
NPSHr is a determined by pump variables (rating, RPM, impeller diameter, etc).
NPSHa is determined by system variables (friction loss, tank level, fluid temp, etc) Therefore vortices and pre-rotation are said to reduce NPSHa, not increase NPSHr.
Hopefully you are starting up with a throttled discharge valve and are not running at min flow and runout conditions. I shouldn't have assumed you were not, which brings on other problems.
Explain the higher pressures and velocities. I have not heard that one Big Inch. Is it due to reduced...
The rule of thumb on min flow protection is: Don't operate below min flow. I wouldn't suggest running close to it either. "Good practice", according to Flowserve, is to run -30% to +15% of the BEP.
You need a PCV, as Valvecrazy and BigInch suggested. These types of applications give VSD's a...
Flow is constant but multiply the head and horsepower by the amount of the stages. This is the case for most multistage curves but some show total head so be careful.
Also, some multistage curves have a friction loss factor and efficiency loss factor for each additional stage. This is usually...
The location of the elbows is more for laminar flow reasons than NPSH. It allows the fluid to "straighten out" so it enters the eye of the impeller at the center, with minimized turbulence, rather than overloading one side of the pump inlet.
The turbulence and friction loss associated with...
Sorry Valvecrazy, I had flash backs of my old boss when I read your post. He hated drives and fought tool and nail to keep them out of his plant, even when it was clearly needed.
If you throttle back to prevent runout conditions, yes you will extend the pump's life. Also, I have seen 5000...
Valvecrazy, I feel the same way about people selling valves!
Once again, valves and drives have their place. Drives are not a fad nor are they a gimmick. They work very well in the right application. True, overzealous vendors can give them a bad name.
A well applied and programmed VSD will...
