Size Selection - MineDuct® Tubing

Selecting the Right Size of MineDuct® Tubing

The MineDuct® nomograph, which is  printable from this site, illustrates the friction losses encountered while moving various volumes of air through different sizes of MineDuct® tubing. It can help in selecting the right size tubing to deliver the amount of air you need and the required air pressure to achieve it.
 
1. Software to help you calculate your system resistance.
2. Print the MineDuct® Tubing Resistance Nomograph, using the print feature in your browser and follow the instructions provided below.

How to use the Tubing Resistance Nomograph:

1. Select your desired tubing diameter.

2. Put a pen/pencil point on the Tubing Diameter scale at that diameter. (Use this as a "pivot point" in the next step.)

3. Locate your required Air Volume. Put a straightedge against the pivot point and rotate the straightedge until it crosses the Air Volume scale at your desired air volume in 1,000’s of CFM (or equivalent m3/s).

4. Read the Static Pressure Loss for that Air Volume / Tubing Diameter combination where the straightedge crosses the Static Pressure Loss scale. (Static Pressure Loss shown in inches water gauge per 100 feet of tubing, and Pascals per 30.48 meters of tubing.)

5. You may want to calculate for some additional CFM to allow for leakage in the system.  (ABC suggests using a maximum10% safety factor.)