4 replies to this topic

[bliztz]

Hi,

I have a question regarding to balance both my vessel level so it wont go low.

 Level Balance Issue.pdf   5.49K   40 downloads

This is the scenario of proposing installation of an outlet balancing line (red line) of two vessels which have a common header with two pumps operating continuously. Will this balancing line can effectively balance the level both of these vessels? The outline line size and common header is 20''. There is about 3m of head between the vessel outlet to the common suction header of pumps.

Thank you.

[Steve Hall]

bliztz,

You have a hydraulic flow problem that can be solved as a simple network. To accurately do so, you'll need to have your pump information as well as the piping data (lengths, fittings, valves, etc.). Essentially, the pressure drop from the top of the liquid in each tank to the pumps must be equal; if the pressure drop due to friction from the discharge line of one tank is higher than the other then that tank's liquid level will be higher. The balancing line you propose can work; you will have to model it into the flow network and play "what if..." games to determine an acceptable size and location. You have to account for differences in the tank head pressures, if any, and have acceptance criteria for the difference in tank level that is acceptable. The flows into the tanks must also be accounted for in your overall material balance, and you might find that your model is dynamic (if the flows into the tanks change with relation to each other over time, for example). This can all be done with a spreadsheet although the solution method may be tricky (e.g., Hardy-Cross).

[bliztz]

Thanks Steve for your useful feedback.

[breizh]

Bliztz

Without indication about the fluid it's difficult to say more than above . Is it free of solid ?
Breizh

[bliztz]

Breizh,

It is a crude stream but there is some sand issue on it.