Gas Piping Size Calculator

Example Calculations

Example 1:

• Diameter of the Tube (d): 2 inches
• Pressure Drop (h): 10
• Length of the Tube (L): 50 ft
• Specific Gravity (SG): 0.60

Using the formula:

$$q = 3550 \left[ \frac{2^5}{1 + \frac{3.6}{2} + 0.03 \cdot 2} \right]^{1/2} \left( \frac{10}{50 \cdot 0.60} \right)^{1/2}$$

Calculating step-by-step:

$$q = 3550 \left[ \frac{32}{1 + 1.8 + 0.06} \right]^{1/2} \left( \frac{10}{30} \right)^{1/2}$$

$$q = 3550 \left[ \frac{32}{2.86} \right]^{1/2} \left( \frac{1}{3} \right)^{1/2}$$

$$q = 3550 \left[ 11.19 \right]^{1/2} \left( 0.333 \right)^{1/2}$$

$$q = 3550 \cdot 3.34 \cdot 0.577$$

$$q \approx 6855.8 \text{ cfh}$$

Example 2:

• Diameter of the Tube (d): 3 inches
• Pressure Drop (h): 15
• Length of the Tube (L): 100 ft
• Specific Gravity (SG): 0.60

Using the formula:

$$q = 3550 \left[ \frac{3^5}{1 + \frac{3.6}{3} + 0.03 \cdot 3} \right]^{1/2} \left( \frac{15}{100 \cdot 0.60} \right)^{1/2}$$

Calculating step-by-step:

$$q = 3550 \left[ \frac{243}{1 + 1.2 + 0.09} \right]^{1/2} \left( \frac{15}{60} \right)^{1/2}$$

$$q = 3550 \left[ \frac{243}{2.29} \right]^{1/2} \left( \frac{1}{4} \right)^{1/2}$$

$$q = 3550 \left[ 106.11 \right]^{1/2} \left( 0.25 \right)^{1/2}$$

$$q = 3550 \cdot 10.30 \cdot 0.5$$

$$q \approx 18282.75 \text{ cfh}$$