Pipe Pressure Drop Calculations from Pipe Flow Software
View basket of Pipe Flow Software for fluid flow and pressure drop calculations (0 items)
Search for  
Tuesday 23rd April 2024   
Pipe Flow Software » Pipe Flow Advisor Software » Tank Empty Times
   Pipe Flow Software
   Pipe Flow Expert Software
   Pipe Flow Wizard Software
   Pipe Flow Advisor Software
      Types of Channel
      Flow in Channels
      Weir Flow
      Types of Tank
      Tank Empty Times
   Convert 123 Software
   News & Press Releases
   Software Downloads
   Who Uses Our Software
   Customer Testimonials
   How to Buy Online
   Get Software License Code
   Software Release Dates
   Pipe Flow Software FAQs
   Technical Articles
   Europump Guides
   Contact Pipe Flow Software
   About Pipe Flow Software
   Piping Related Links
   Site Map

Secure Online Payment

How to buy Pipe Flow Software online today



Flow Advisor - Tank Empty Times

Time to empty a Tank

The discharge from an orifice is dependant on various factors:
  • The discharge coefficient (varies with the type of outlet fitting).
  • The cross-sectional area of the orifice.
  • The 'Head' of water above the orifice outlet.
Tank Flow Calculations, effect of Outlet type
Channel Flow and Tank Flow Calculations, find flow, volume, weight, expansion, tank empty times

Buy Flow Advisor to calculate flows in channels and tanks

[ Download Free Trial ]
The Flow Advisor program offers a choice of outlet types:
  • Rounded outlet - discharge coefficient 0.98
  • Square edge outlet - discharge coefficient 0.80
  • Sharp edge outlet - discharge coefficient 0.61
  • Borda outlet (projecting inside) - discharge coefficient 0.51
Tank Flow Calculations, effect of Outlet type Discharge Flow Rate

The discharge flow rate from an orifice is calculated as follows:

Flow rate = Orifice discharge coefficient x Orifice cross-sectional area x square root (2gH)

Where g = acceleration due to gravity
Where H = head of fluid about outlet

As the tank empties the fluid head will reduce and the discharge flow from the orifice will reduce.
Fluid Surface Area

If the fluid surface area within the tank is not constant, the rate of change in the fluid head will not be constant. Initially the change in fluid head may be slow, but as the tank empties the fluid head will change more quickly.

The example shows that the time to reduce the fluid level by 300 mm (12 inch) is initially 3m - 37s, where as the final 300 mm of fluid will empty in 1m - 33 s.
Tank Flow Calculations, effect of Outlet type Effect of Discharge Pipe

When a pipe is used to feed the tank discharge to some other point the pipe may restrict the discharge flow rate.

When a 4 metre (13 ft) length of pipe is used, in this example, the time to empty is increased by almost 8 minutes.
Flow Advisor for Channels and Tanks can help you save time and money.

Click here to download Flow Advisor for a FREE trial!

  Pipe Flow Software: Piping design & pressure drop calculations from www.pipeflow.co.uk Copyright © Daxesoft Ltd. 1994 - 2024, All rights reserved.