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In gas fitting, what does the term 'downstream demand' refer to?

  1. The volume of gas supplied to appliances

  2. The pressure of gas flowing into the regulator

  3. The total capacity of the gas meter

  4. The rate of gas consumption at the outlet

The correct answer is: The volume of gas supplied to appliances

The term 'downstream demand' in gas fitting specifically refers to the volume of gas that is supplied to appliances. This concept is crucial for ensuring that the gas supply system is designed and maintained effectively to meet the needs of the appliances connected to it. Understanding downstream demand helps in sizing the gas supply pipes, regulators, and meters correctly to avoid any issues such as low pressure or insufficient gas flow. By calculating the downstream demand, gas fitters can determine whether the existing infrastructure can adequately supply the necessary amount of gas, ensuring safe and efficient appliance operation. The other concepts related to gas supply, such as pressure flowing into the regulator, capacity of the gas meter, or the rate of consumption at the outlet, do not capture the broader picture of how much gas appliances require. Instead, they focus on specific parameters that influence or measure gas supply but do not address the overall demand from all appliances located downstream from the gas supply.