The Drain Time for Vertical Tanks Calculator is used to determine the time to drain a vertical vessel between any two liquid levels. The calculator is applicable to vessels with flat, elliptical, or hemispherical bottom heads.
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Tank Data
Tank Inner Diameter (ft): (What's this?)
Tank Inner Diameter:
Vessel Head Type: (Help)
Typical Vessel Head Types:
Cone Angle (deg): (What's this?)
The Cone Angle is the angle measured from the horizontal bottom seam of the tank, to theconical bottom. This is applicable only for vessels with a conical head.
Initial Liquid Level (ft): (What's this?)
Initial Liquid Level:
Final Liquid Level (ft): (What's this?)
Final Liquid Level:
Distance to Pipe Outlet (ft): (What's this?)
Distance to Pipe Outlet:
Fluid and Piping Data
Nominal Pipe Size:
Pipe Schedule:
Piping Material:
Viscosity (cP): (Typical Values)
Typical Viscosity Values
Gasoline @ 70F0.6
SAE 30 Oil @ 70F300.0
Water @ 70F1.0
Specific Gravity: (Typical Values)
Typical Specific Gravity Values
Gasoline @ 70F0.750
SAE 30 Oil @ 70F0.898
Water @ 70F1.000
Temperature: (F)
Piping Length (ft):
Flanged or Butt-Welded Elbows
Threaded Elbows
Entrance and Exits
Increasers and Reducers
Precent Addition to Clean Pressure Drop: (Help)
Increasse In Pressure Drop Due to Scale, Dirt, and Corrosion
Some piping systems will experience corrosion, scaling, dirt accumulation, etc. This accumlation will decrease the inner diameter avaliable for flow and change the roughness of the pipe. Both these changes will increase the pressure drop in the system. A typical increase is 20% of the clean pressure drop. If you would like to add this use factor to your calculation enter the percent increase desired below.

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Engineering Calculator Disclaimer

GlobalSpec, Inc. engineering calculators are free for individuals to use via this site under the terms and conditions set out under the Terms of Use of this web site and supplemented by this Engineering Calculator Disclaimer. These calculators are intended solely for general information and educational purposes, and are provided to help decrease the learning curve for those inexperienced in the engineering field and to give more experienced users additional reference tools.

The engineering calculators provided are not intended in any way as engineering advice or services, or as a solicitation for any engineering product or service. Any results from use of these calculators may not be applicable or accurate with regard to the individual circumstances, cannot be relied upon for anything, including, without limitation, engineering designs or decisions, and should not be the basis for any action or inaction on your part. Read Entire Disclaimer

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