Class 5 Boiler Practice Exam

Is PVC allowed to be used in compressed air systems?

1. Yes

2. No

3. Only under certain conditions

4. Only with special fittings

The correct answer is: No

The use of PVC (polyvinyl chloride) in compressed air systems is not allowed due to safety concerns. PVC is not designed to withstand the high pressures typically found in compressed air applications. Under pressure, PVC can become brittle and may fail, posing significant risks such as sudden rupture, which can lead to injury or damage to surrounding equipment. Furthermore, when PVC does fail, it can shatter into sharp, dangerous pieces, further increasing the potential for accidents. Instead, materials specifically engineered for pressure applications, such as steel or certain types of polyamide or polyethylene, are recommended for use in compressed air systems. These materials have been tested to ensure they can handle the stress and pressures associated with compressing air, thus promoting safe operation.