What is the required pipe size for section A?

What is the required pipe size for section A?

• A. 1 inch
• B. 1 1/2 inch
• C. 1 1/4 inch
• D. 2 inch

Answer: (B)

In gas piping, the pipe size is chosen based on how much gas (BTU/hr) needs to flow to that section and how far the gas has to travel, so the pressure drop stays within the allowable limit. You use a sizing chart or perform a pressure-drop calculation for the run from the supply to section A, considering the total load served by that section and the length of the run. The 1 1/2 inch option is the right pick because, when you apply the sizing chart to the BTU load for section A and the run length, it is the smallest diameter that can carry the required gas flow without exceeding the maximum allowable pressure drop. Using a smaller pipe would not provide enough capacity, causing a drop in pressure that could starve appliances or cause improper operation. A larger diameter would meet the demand but isn’t necessary and would add unnecessary cost. So, the 1 1/2 inch size satisfies both the capacity and the acceptable pressure-drop requirements for section A.

In gas piping, the pipe size is chosen based on how much gas (BTU/hr) needs to flow to that section and how far the gas has to travel, so the pressure drop stays within the allowable limit. You use a sizing chart or perform a pressure-drop calculation for the run from the supply to section A, considering the total load served by that section and the length of the run.

The 1 1/2 inch option is the right pick because, when you apply the sizing chart to the BTU load for section A and the run length, it is the smallest diameter that can carry the required gas flow without exceeding the maximum allowable pressure drop. Using a smaller pipe would not provide enough capacity, causing a drop in pressure that could starve appliances or cause improper operation. A larger diameter would meet the demand but isn’t necessary and would add unnecessary cost.

So, the 1 1/2 inch size satisfies both the capacity and the acceptable pressure-drop requirements for section A.