Red Seal Plumbing Practice Exam

When installing flow controls on gas piping, what is their function?

1. To filter the gas

2. To increase gas pressure

3. To keep operating pressure lower than the supply pressure

4. To measure gas flow

The correct answer is: To keep operating pressure lower than the supply pressure

Flow controls on gas piping operate by limiting the flow of gas, thus keeping the operating pressure at a lower level than the supply pressure. This ensures the gas is delivered at the appropriate pressure for safe and efficient use. Option A is incorrect because filters are used to remove particles and impurities from the gas, not control its flow. Option B is incorrect because increasing gas pressure would be dangerous and can result in explosions. Option D is incorrect because while flow controls can measure gas flow, that is not their main function when installed on gas piping. They are primarily used to regulate pressure.