the home of .TT pocketEngineer softDesign - where pocketEngineer software lives...

Pipe_f.Loss v1.3 (Windows)

a single pipe friction loss (pressure drop) calculations... featuring 2-K Method minor loss

Please enable JavaScript to view this page content properly.
Please enable JavaScript to view this page content properly.
Please enable JavaScript to view this page content properly.

To take a glance at all pocketEngineer software and OS requirements, click Overview.

Pipe_f.Loss: Full built-in Data, Material & Fitting Selections

Pipe_f.Loss is specially developed to feature 2-K Method for a single pipe friction loss (pressure drop) calculations. Note that Pipe_f.Loss does not calculate total system (pump) head.

It's a plug-and-use Windows PC program, thus creating a mobile design environment (ShowMe!) for the practising engineers & designers in today's mobile world.

Highlights:

- built-in selections for valves & fittings losses using 2-K Method developed by Hooper - 4 options (Colebrook, Swamee, etc) for solving friction factor f - design as easy as "Select & Click" with full built-in database, conversion calculators, guides, etc - save/open project, save results to Rich Text File (.rtf) for formatting & printing

- fully mobile “plug-and-use” program with no setup requirement

Feature . . . 2-K Method for Minor Loss Calculations

The 2-K method is a technique developed by Hooper B.W. to predict the head loss in an elbow, valve or tee. The 2-K method is advantageous over other method especially in the laminar flow region. The 2-K method takes the following forms of equation:

a) for valve & fitting, K = (K1/Re) + K2(1+(1/ID))

where K1 = K for the fitting at Re (Reynolds number) = 1, laminar flow K2 = K for a large fitting at Re = infinity, turbulent flow ID = internal pipe diameter in inch

b) for entrances & exits, K = (K1/Re)+K2. Here, the constant K2 is the "classic" K.

for details, refer to (1) "The Two-K Method Predicts Head Losses in Pipe Fittings" by Hooper B.W., Chemical Engineering, August 24, 1981; (2) "Fluid Flow Handbook" by Jamal M. Saleh (Editor), McGraw-Hill, 2002.

A calculation example using 2-K method can be downloaded here.

Solver for solving Friction Factor, f . . . don't be confused

note: The friction factor, f, mentioned here is Darcy friction factor, not Fanning friction factor. Darcy f = 4 x Fanning f - don't be confused!

a) Laminar Flow: Friction factor is solved by the equation f = 64/Re, where Re=Reynolds number.

b) Turbulent Flow: Solving friction factor for turbulent flow can be tedious and complex. There are numerous equations, both implicit & explicit forms, available for solving friction factor.

Implicit equation requires iteration process and it is best to let a computer program to perform it. The most popular and common one is the Colebrook equation. However, it is to note that there are numerous forms of Colebrook equation available - main and modified forms. In the Pipe_f.Loss program, 4 friction factor equations are included as follows:

Head Loss & Pressure Drop: Darcy-Weisbach equation

Darcy-Weisbach equation is used in the head loss and pressure drop calculations. For details, refer to ASHRAE Fundamentals 2005.

Calculation Example: 2-K Method Minor Losses (in English units)

Consider a 16-in (ID = 15.624-in) Sch 40S stainless steel system. The system contains 100 ft of pipe, 6 long-radius (R/D=1.5) 90^{o} elbows, 2 side-outlet tees, 2 gate valves (β=0.9) and an exit into a tank. The fluid has dynamic viscosity of 1 cP, density of 62.43 lb/ft³, and the flow rate is 13.314 ft³/s. What is the head loss through this system?

The following is the results computed by Pipe_f.Loss program: