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Size Selection - RigiDuct® Tubing |
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The RigiDuct® nomograph, which is printable from this site, illustrates the friction losses encountered while moving various volumes of air through different sizes of RidiDuct® tubing. It can help you select the right size tubing to deliver the amount of air you need and the required air pressure to achieve it. |
Methods of Determining YOUR RigiDuct® Tubing Size
| 1. | Software to help you determine your ventilation resistance at sea level and altitude. |
| 2. | Print the RigiDuct® Tubing Resistance Nomograph, using the print feature in your browser and follow the instructions provided below. |
How to use the Tubing Resistance Nomograph:
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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, or where the straightedge crosses the Static Pressure
Loss scale. (Static Pressure Loss is shown in inches water gauge per 100 feet of
tubing and Pascals per 30.48 meters of tubing.) |