Size section #3 in the drawing above using the longest length method and the pipe sizing tables in the International Fuel Gas Code.
Understand the Problem
The question is asking to size section #3 in the drawing using the longest length method and gas pipe sizing tables in the International Fuel Gas Code. It involves calculating the appropriate pipe size based on the total BTU demand and the specified distance and pressure drop.
Answer
$2$-inch diameter schedule 40 black iron pipe.
Answer for screen readers
The appropriate size for section #3 is a 2-inch diameter schedule 40 black iron pipe.
Steps to Solve
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Determine Total BTU Demand Calculate the total BTU demand from the outlets on section #3.
- Outlet A (Clothes Dryer): 35,000 BTuh
- Outlet B (Range/Oven): 75,000 BTuh
- Outlet D (Furnace): 100,000 BTuh
- Total: $$ \text{Total BTU} = 35,000 + 75,000 + 100,000 = 210,000 , \text{BTuh} $$
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Measure the Longest Length Identify the longest run of pipe from the point of delivery to the outlet in question.
- Given lengths:
- From Point of Delivery to Outlet D: 20 ft
- From Point of Delivery to Outlet B: 5 ft
- From Point of Delivery to Outlet A: 15 ft
- Longest Length = 20 ft to Outlet D
- Given lengths:
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Calculate Pressure Drop Using the pressure drop allowed (0.5 inches W.C.), determine the required gas pipe size using the gas pipe sizing tables from the International Fuel Gas Code.
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Consult the Pipe Sizing Table Refer to the appropriate table based on the specific gas's specific gravity (0.60) and heating value (1000 BTU/cubic foot).
- From the table, locate the row corresponding to a total BTU demand of 210,000 BTuh and a pressure drop of 0.5 inches W.C.
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Select Appropriate Pipe Size Identify the size of the schedule 40 black iron pipe based on the values found in the table.
The appropriate size for section #3 is a 2-inch diameter schedule 40 black iron pipe.
More Information
The sizing is based on the longest length method and maintaining the designated allowable pressure drop. The International Fuel Gas Code provides comprehensive tables that take into account BTU demands, pressure drops, and pipe lengths.
Tips
- Forgetting to calculate the total BTU demand: Always ensure to sum all the BTU demands from each outlet.
- Not accounting for additional fittings or bends in the pipe: In real installations, fittings increase resistance and should be considered.
- Overlooking pressure drop limits: Make sure to adhere to the specified pressure drop in your calculations.
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