Size section #3 in the drawing above using the longest length method and the pipe sizing tables in the International Fuel Gas Code. The material is schedule 40 black iron pipe. The... Size section #3 in the drawing above using the longest length method and the pipe sizing tables in the International Fuel Gas Code. The material is schedule 40 black iron pipe. The natural gas supplied has a 0.60 specific gravity and a heating value of 1000 Btu per cubic foot with a designated pressure drop of 0.5 inches W.C.
Understand the Problem
The question requires us to determine the appropriate size of a pipe for a gas delivery system based on specified conditions including the layout of the system, outlet BTU demands, and pressure drop requirements according to the International Fuel Gas Code.
Answer
The appropriate pipe size for section #3 is $1 \frac{1}{4}$ inch.
Answer for screen readers
The appropriate pipe size for section #3 is $1 \frac{1}{4}$ inch.
Steps to Solve
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Identify Total BTU Demand Calculate the total BTU demand for the outlets connected to section #3.
- Outlet A: 35,000 Btu/h
- Outlet B: 75,000 Btu/h
- Outlet D: 100,000 Btu/h
- Total = $35,000 + 75,000 + 100,000 = 210,000$ Btu/h
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Determine Total Length of Pipe Calculate the total length of the pipe in section #3, which includes all the specified straight distances.
- From the point of delivery to the outlets:
- 10 ft + 15 ft + 20 ft + 5 ft = 50 ft
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Reference the Pipe Sizing Table Using the International Fuel Gas Code, look for the appropriate pipe size based on the total BTU demand (210,000 Btu/h), the total length (50 ft), and the designated pressure drop (0.5 inches W.C.).
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Calculate Specific Gravity Influence Since the natural gas has a specific gravity of 0.60, adjust the BTU demand accordingly. Refer to the sizing tables which account for specific gravity in the calculations.
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Select the Correct Pipe Size Find the corresponding pipe size in the sizing tables that can accommodate a gas flow of 210,000 Btu/h over a distance of 50 ft with a pressure drop of 0.5 inches W.C.
The appropriate pipe size for section #3 is $1 \frac{1}{4}$ inch.
More Information
Pipes are sized based on the BTU demand, pressure drop, and the length of the pipe, which ensures efficient gas delivery. In this scenario, a $1 \frac{1}{4}$ inch pipe can effectively handle the specified conditions from the International Fuel Gas Code.
Tips
- Ignoring the pressure drop requirements can lead to undersized pipes, causing inadequate gas supply.
- Not considering specific gravity adjustments based on gas type may result in incorrect sizing.
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