Hello all,
I am having difficulty determining the amount of air that will be pulled into the suction piping when one of our rail cars empties, but the pump is still pumping remaining rail cars. This is the basic scenario:
We are unloading 4 rail cars with a centrifugal pump. When the railcars...
Hi all, thanks for taking the time to read this.
I would like to know how a horizontal pipeline that is flowing a fluid reacts when air is added to it.
Background: I am looking to analyze the suction piping of a pump to program a variable frequency drive (VFD). Under normal conditions, the...
Hello all,
We are currently having two issues with our existing PD pumps that we use to unload rail cars. They are cavitating and aerating due to the varying product levels in the rail cars. We typically unload from multiple cars simultaneously, and this makes it difficult for our operators to...
All,
I have a positive displacement pump I am considering to unload rail cars with. The area is tight and we have an 8" pipeline that we can utilize for our rail track. The 8" pump we first considered will only give us approximately 1150 GPM, we are looking for more. The 10"x10" positive...
Hello all,
I work at a tank terminal for oil and gas. We have a floating barge that we use to load/unload barges. From our pipe bridge on land, we use a hose to connect to the hard pipe on our floating barge. The hose is used to accommodate for elevation changes on the river. The problem is that...
Hello all,
I am writing up a powerpoint/class for our operations department here at our terminal. I will be covering the very basics of positive displacement and centrifugal pumps, hydraulics, and troubleshooting. I was looking on here for some literature to browse and use in my presentation and...
Hello Eng-Tips,
I am having some issues modeling what I need in AFT Fathom, but this questions can be asked without using the program as well.
We have a pump that needs to maintain a pressure drop of above 30 psi to work properly. (Leistritz L5NG Rotary Screw Pump). It is currently between 12"...
Hi Eng-Tips,
I was not sure what to call the second fitting I am talking about. My welders at the company are questioning their foreman on the weldolets he is ordering for a project. They are asking why they cannot just modify a piece of pipe with the saddle cut out and weld it onto a pipe to...
Hello all,
Here at our plant, we are upgrading old valves in our foam-water system for emergency fires. I do not have specs on the foam-water mixture. We currently have (6) 10" CS Full Port Ball valves with electric actuators on the pipe leading to our tanks. I have received a quote from a...
Hi all, I just joined and am a new hire at a bulk liquid storage facility. No previous experience outside of college.
I have a basic question that I'm trying to understand physically. I cannot grasp what is happening to a fluid throughout a pipe and how it relates to the discharge pressure of a...
