HP41 Programs

08092015, 07:16 PM
Post: #1




HP41 Programs
Hi: I' am looking for a program to calculate the volume of laminar flow of water in a pipe using Manning's formula. Inputs would be: Slope of the pipe, diameter of the pipe, Manning's roughness factor, and measured depth of flow. Barcode of the program would be great, or mag cards (I could provide the cards if I can find some), or even the program listing if that is all you have. Email me direct at W1GIG@att.net Thanks, Tim


08092015, 07:44 PM
Post: #2




RE: HP41 Programs
There was this thread MANPIP where Jerussi was looking for a program using Manning's equation.
But as far as I remember the slope of the pipe wasn't involved. Maybe it's still useful for you. Some of the attachments in my posts contain the barcode of the programs. Thus it should be easy for you to load them into your calculator. Kind regards Thomas 

08112015, 07:32 PM
Post: #3




RE: HP41 Programs
Circular XSection, Partially Full, Gravity Flow, SOLVER approach
Problem A 4footdiameter finished concrete pipe is laid at a slope of 0.2%. The water depth is 3 feet. Calculate the flow rate and flow velocity using Manning's equation. Solution Step 1. Calculate the flow rate (ft3/sec).  Q for Partially Full Circular XSection Q=C÷N((0.5×SIN(ACOS((H−D÷2)÷(D÷2))×2)+π(360−ACOS((H−D÷2)÷(D÷2))×2)÷360) ×(D÷2)^2)^(5÷3)÷(π×D(360−ACOS((H−D÷2)÷(D÷2))×2)÷360)^(2÷3)×S^0.5 Where: Q = flow rate (ft3/sec, m3/s) C = 1.49 for English units, 1 for Metric units N = Manning roughness coefficient H = depth of water (ft, m) D = diameter of pipe (ft, m) S = slope of energy line (decimal) Step 2. Compute the velocity of flow.  V for Partially Full Circular XSection V=C÷N((0.5×SIN(ACOS((H−D÷2)÷(D÷2))×2)+π(360−ACOS((H−D÷2)÷(D÷2)) ×2)÷360)×(D÷2)^2)÷(π×D(360−ACOS((H−D÷2)÷(D÷2))×2)÷360)^(2÷3)×S^0.5 Where: V = velocity of flow (ft/sec, m/s) C = 1.49 for English units, 1 for Metric units N = Manning roughness coefficient H = depth of water (ft, m) D = diameter of pipe (ft, m) S = slope of energy line (decimal) see attached PDF for Equations & Illustrations. [attachment=2421] BEST! SlideRule 

08182015, 03:55 PM
Post: #4




RE: HP41 Programs
To Sliderule:
Thanks again! Tim Walker 

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