Sample interview questions: Can you explain the process of sizing gas lines for multiple appliances on the same system?
Sample answer:
Sizing Gas Lines for Multiple Appliances
To properly size gas lines for multiple appliances on a single system, follow these steps:
1. Determine Appliance Gas Consumption:
Gather the gas consumption rates for each appliance, usually found on the appliance data plate or manufacturer’s specifications. These rates are typically measured in cubic feet per hour (CFH).
2. Calculate Total Gas Flow:
Sum the gas consumption rates of all appliances that will be using the gas line simultaneously.
3. Determine Line Pressure and Length:
Obtain the gas pressure at the gas source and the length of the gas line run.
4. Select Line Size:
Using a gas sizing chart or the International Fuel Gas Code (IFGC) tables, determine the appropriate line size that can safely carry the calculated gas flow at the given pressure and length.
5. Consider Pressure Drop:
Factor in the pressure drop that occurs as gas flows through the line. Longer lines and smaller diameters result i… Read full answer
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