The pump should be located as close as possible to the tank, but may not be allowed within the dyked area. The nozzle will be positioned on the same side of the tank as the pump. The pump should be at a lower elevation to the nozzle (which of course is located low down on the tank). Internally you may have an internal pipe with a downturned elbow to a sump. Check with the process engineer. If you do then a 3/4" valved vent is required off of the top of the nozzle tied back to the tank. Do not pocket the suction line. Use horizontal offset only and be free-draining to the pump suction. If your mechanical group have selected a top suction arrangement, consider requesting that it be changed to front suction. This will aid in keeping the pump suction connection lower that the tank nozzle. Assuming this tank is on a gravel pad, you will need to discuss required offsets in the piping with your stress group to allow for tank settlement. I usually have civil detail a top of gravel 2" higher than the calculated elevation to allow for the immediate settlement experienced by the tank hydrotest. Further settlement over time will be taken into account by the stress group by designing flexibility into the piping. Or you may use a flexible connection at the nozzle. Depending on what you end up with, a sealed dyke wall penetration may be required.
Hope this helps,
Richard B.
what precautions are required in following piping how to fix storage tank nozzle pump suction nozzle ? can we use more elbows (up and down loops) in suction line ?
[Non-text portions of this message have been removed] Received on Wed Aug 01 13:27:00 2007
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