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Thanks rmw, I will check it out. Regards

Thank you both for the replies, rmw I did check on the website but did not have much luck. Katmar, I am pretty new on this I will do a search on down leg for self venting flow. Have a nice day

Are there any rules of thumb for design of seal legs besides taking into consideration that the height of the system should be larger than the pressure of the system?

thank you all for the suggestions, I checked the specs for this system and the NPSHA/NPSHR margin is only 1, which from literature reviews indicates is not enough (literature indicates at least 5). The pumps are installed in parallel, with a common header. We tried doing a velocity study but...

Sorry if I misled you all with my explanation. I have a set of three parallel pumps that draw water from an open pit. Ideally we'd like to have two pumps running and one on stand by but with current conditions all three pumps are running all the time. Now, we are undergoing an expansion and...

I was wondering if any body could lead me to a better understanding of suction lift. I've been able to learn a few concepts from the Cameron Hydraulic Data book, but from what I've seen, the use of a set of centrifugal pumps in parallel we have at the plant is not ideal for this kind of...

thank you for the assistance!!

the line is not heat traced, and the temperature of the sulfuric acid is maintained at approximately 65-75 degrees F. Thanks for the link I will look it up.

Hi, I've been going through the threads looking for information regarding the mechanism for corrosion of carbon steel piping under chlorinated sulfuric acid (98-96%) service. One of our spools failed (it had a hole in one side inside the pipe and the corrosion was uneven) and I'm trying to...

As a matter of fact the flow becomes chocked as the gas experiences both restriction and expansion. I'd be more than happy to get a hold of some software to do the calculation however with the current economic downturn it is difficult to do since our corporate office cut our budget. I think...

Hi, Recently I came across a copy of "Gas-Flow Calculations: Don't Choke from Trey Walters" that describes the behavior compressible fluids undergo as they travel down the line. He describes a series of steps and iterations to carry out in order to come up with an accurate solution to...

desnov74, haven't you noticed that this trend is in every single industry? i.e. doctors, teachers, nurses, engineers, people without university education included etc. seem to be getting way too comfortable with making money without having to work "hard". I suspect this is the reason for our...

mtngreen, You are absolutely right. As a matter of fact according to operations (before my time) those pumps would cavitate quite often. It seems the previous engineer worked on this system but unfortunately the data left with him so it's difficult to say how the system was analyzed in the...

Thank you all for the great tips. I will start working on gatherind field data right away. We are scheduled to put pressure gauges sometime today or tomorrow. I will continue posting as we work towards solving this issue. Again thank you and have a great day.

Here is the pump curvehttp://files.engineering.com/getfile.aspx?folder=38adec4b-1063-4249-9708-c7c6b5a81eff&file=pump_curve.bmp

JJPellin, During previous analysis it was determined that the conditions previously mentioned (pit level and valve position) are optimum to maintain a constant level in the priming chamber and thus avoid cavitation, the data I included previously is from the data sheet. You are right about the...

mtngreen, The level in the tank has to be kept at 60% in order to maintain the level in the priming chamber (the tank on the suction of the pumps). The control valve maintains the level and is currently 45% open. The flow going into the pit is approximately 4500 GPM. TDH is 120 ft, NPSHA is...

Hi, I am analyzing a system that consists of three identical centrifugal pumps. I am debating weather the pumps are in parallel because the literature indicates that for a series of pumps to be considered in parallel they would have to share a common suction and a common discharge. This is...