New York Low Pressure Boiler Certificate of Fitness (COF) Practice Test

In which part of the oil piping system must a relief or pressure regulating valve be installed?

1. On the supply side of the shut-off valves

2. On the return side of the shut-off valves

3. On the discharge side of the pump

4. In the fuel storage tank

The correct answer is: On the supply side of the shut-off valves

A relief or pressure regulating valve must be installed on the supply side of the shut-off valves to effectively manage the pressure within the oil piping system before it reaches the burner or its related components. The primary function of this valve is to prevent excessive pressure from building up in the supply line, which could lead to leaks or dangerous conditions if not regulated properly. Placing the relief valve on the supply side allows it to sense the pressure in the pipeline, ensuring that any pressure exceeding the safe limits can be released before the oil reaches critical components. It also prevents the potential backflow of oil and maintains a safe working environment. In contrast, other locations mentioned would not provide the same level of safety or functionality. For instance, placing the valve on the return side or in the fuel storage tank would not effectively manage downstream pressure conditions and could create uncontrolled hazards upstream. The discharge side of the pump might also not be the optimal location due to the already established pressure from the pump's operation. By adhering to the standard practice of positioning the valve on the supply side, optimal system protection can be ensured.