Atmospheric Tank Incoming Pressure
Atmospheric Tank Incoming Pressure
(OP)
Hello Guys,
I have a tank with height 40 feet and 55 feet in Diameter. Currently we want to connect pump discharged line to this tank. Based on our reading on the pressure gauge near the the existing outlet of the discharged line, the pressure is about 70 Psig. What will be happen to my tank if I connect the pump line to my new tank with such 70 Psig incoming pressure ..??? We appreciate all of your help
I have a tank with height 40 feet and 55 feet in Diameter. Currently we want to connect pump discharged line to this tank. Based on our reading on the pressure gauge near the the existing outlet of the discharged line, the pressure is about 70 Psig. What will be happen to my tank if I connect the pump line to my new tank with such 70 Psig incoming pressure ..??? We appreciate all of your help





RE: Atmospheric Tank Incoming Pressure
RE: Atmospheric Tank Incoming Pressure
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RE: Atmospheric Tank Incoming Pressure
Regards,
SNORGY.
RE: Atmospheric Tank Incoming Pressure
Tanks for your information. In my new line we will instaal 16 inch pipe line incoming to the atmoshperic tank i said before. The incoming flowrate and outgoing flowrate from the tank will be same about 400,000 bwpd. Is it allowed to have such 70 Psig to the tank..??? If yes why..??? Sorry I'm still confuse. If we put 70 Psig on the tank inlet, does it will create water jetting on the tank..???
RE: Atmospheric Tank Incoming Pressure
I assume that the 70 psig is the shut-in pressure of a valve adjacent to the tank. As such, the pressure adjacent to the tank will be much less when the line is flowing. Take a look at the exit loss for the flow to determine the pressure adjacent to the tank.
Otherwise, if you are flowing into the tank with the exit loss being 70 psig, you have some problems.
How do you come up with the 400,000 bbl/day? Is this a calculated number from a hydraulic analysis? If so, you should be able to calculate the velocity of the fluid entering the tank and then determine the exit loss.
Please provide the calculated flow rate and/or the velocity of the stream entering the tank.
RE: Atmospheric Tank Incoming Pressure
A 16" line will simply have a higher flow rate.
If you are somehow concerned about the fluid impinging on the opposite side... use an inlet distributor / diffuser.
jt
RE: Atmospheric Tank Incoming Pressure
If the pump is centrifugal, then you have two options. Either you provide a control system to pinch the pump back to the target flow rate or you let the pump run out on the curve which will deliver much more flow than you want. I assume that either the incoming or outgoing flow would be controlled to maintain the level in the tank. But, there are a lot of different control schemes that could be used.
The important point is this: If you reduce the pressure on the discharge of a centrifugal pump from 70 psig to 20 psig, the flow will increase based on the pump performance curve. If you don't want the flow to increase, you have to rerate the pump, or take up that extra pressure drop somewhere else. I tend to assume the use of a control valve to take up the pressure drop. Others might lean toward a speed reduction, impeller diameter change or a piping change that would result in the same pressure reduction.
Johnny Pellin