Size section #2 in the drawing above using the longest length method and the pipe sizing tables in the International Fuel Gas Code. The natural gas supplied has a 0.60 specific gra... Size section #2 in the drawing above using the longest length method and the pipe sizing tables in the International Fuel Gas Code. 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. The material is schedule 40 black iron pipe. The options are: a. 1 inch b. 2 inch c. 1 1/2 inch d. 1 1/4 inch
Understand the Problem
The question is asking for the appropriate size of a gas pipe needed to supply multiple outlets based on the longest length method and specific gas guidelines. The goal is to determine the correct diameter of the pipe using the given specifications.
Answer
The required gas pipe size is $1 \frac{1}{4}$ inch.
Answer for screen readers
The appropriate size of the gas pipe is $1 \frac{1}{4}$ inch.
Steps to Solve
- Determine Total Demand in Btu/h
First, calculate the total demand of all outlets. This includes:
- Outlet A: 35,000 Btu/h
- Outlet B: 80,000 Btu/h
- Outlet C: 50,000 Btu/h
- Outlet D: 110,000 Btu/h
Total demand: $$ \text{Total Demand} = 35,000 + 80,000 + 50,000 + 110,000 = 275,000 \text{ Btu/h} $$
- Calculate the Longest Length to Each Outlet
Next, measure the distance from the point of delivery to each outlet. The distances are:
- Outlet A: 25 ft
- Outlet B: 15 ft
- Outlet C: 5 ft
- Outlet D: 20 ft
The longest length is from the point of delivery to Outlet B, which is 25 ft.
- Refer to the Pipe Sizing Tables
Use the International Fuel Gas Code pipe sizing table for estimating pipe size based on the total demand and length.
Assuming the gas is natural gas with a specific gravity of 0.60 and a heating value of 1000 Btu/ft³, find the appropriate pipe size for a:
- Pressure drop of 0.5 inches W.C.
- Total Demand of 275,000 Btu/h
- Longest Length of 25 ft
- Determine the Pipe Diameter
Based on the information and typical pipe sizing tables, you would typically find that for a demand of 275,000 Btu/h over a distance of approximately 25 ft, a 1 1/4 inch schedule 40 black iron pipe would usually be sufficient.
The appropriate size of the gas pipe is $1 \frac{1}{4}$ inch.
More Information
This diameter is selected based on guidelines from the International Fuel Gas Code, which provides necessary specifications for natural gas supply based on demand and distance.
Tips
- Not considering all outlets in total demand calculation.
- Overlooking the effective distance to each outlet when measuring.
- Incorrectly interpreting the pipe sizing tables based on the wrong conditions.
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