**
Calculator**

**Fluid Flow Calculator**

**by Michael J. Rocchetti PE
Mechanical Engineer**

**This calculator is used to calculate pipe friction losses for straight
piping handling water and water with varying percentages of ethylene
glycol. The calculator uses an algorithm developed from the basic
principles of fluid mechanics. The program is based on the Darcy-Weisbach
equation, the Colebrook equation, and the Moody equation. The program is
intended for use only on straight piping. The program does not include
pressure losses due to elevation differences, or flow through fittings. **

**This calculator allows you to input the fluid type, the fluid
temperature, the flow rate, the pipe size, pipe length, and pipe material.
The calculator then determines the velocity, the Reynolds number, the Moody
friction factor, the pipe friction factor (from the Colebrook equation),
the pipe head loss, and the pipe friction loss in PSI. This calculator is intended for use on systems handling water and water with varying percentages of ethylene glycol.**

**Please note that this method works for turbulent flow situations where the
Reynolds Number is greater than 3000. If you find that your Reynolds number
is less than 3000, you should revise your input parameters (increase the flow
rate and/or reduce the pipe size). **

**Additional Design Criteria: If your piping is being used in an open loop
system, flow velocities should be in the range of 5 to 10 ft/sec. For
closed loop piping systems, you should use a 4 ft/sec limit for piping
of 2" or less. For larger pipe sizes, use a limit of 4 FT of head loss
per 100 FT of pipe. **

**References: **

**Fluid Mechanics and its applications by James W Murdock, PE**

Houghton Mifflin Co.**Heating Ventilating and Air Conditioning Analysis and Design**

by Faye C. McQuiston and Jerald D. Parker

John Wiley & Sons.**Flow of Fluids Through Valves, Fittings, and Pipe**

Technical Paper No. 410

The Crane Company**ASHRAE Fundamentals 1993**

The American Society of Heating Refrigerating and Air Conditioning Engineers