Sample interview questions: Can you explain the process of sizing gas lines for high-altitude or low-pressure applications?
Sample answer:
When it comes to sizing gas lines for high-altitude or low-pressure applications, there are several factors that need to be taken into consideration. These include the altitude of the location, the pressure requirements of the appliances being used, and the length and diameter of the gas lines.
At high altitudes, the air pressure is lower, which means that the gas pressure also decreases. This can affect the performance of gas appliances and potentially lead to inefficient operation or even safety issues. Therefore, it is crucial to properly size the gas lines to ensure that an adequate supply of gas is delivered to the appliances.
To begin the process of sizing gas lines for high-altitude or low-pressure applications, the first step is to determine the total gas demand of all the appliances that will be connected to the system. This includes calculating the BTU (British Thermal Unit) requirements of each appliance and adding them together.
Next, the gas line sizing tables provided by the local authority or gas code need to be consulted. These tables take into account various factors such as the altitude, the type of gas being used, and the desired pressure drop. The pressure drop refers to the decrease in gas pressure that occurs as the gas flows through the pipes.
Based on the gas line sizing tables, the appropriate pipe diameter can be selected. It is important to choose a pipe diameter that can accommodate the required gas flow rate without exceeding the recommended pressure drop. Larger pipe diameters will allow for greater gas flow and lower pressure drop, while smaller diameters will restrict… Read full answer
Source: https://hireabo.com/job/12_0_12/Gasfitter