Which of the following materials can be used on oil piping for a residential installation?

• A. Flexible connector
• B. PVC pipe
• C. Cast iron pipe
• D. Aluminum tubing

Answer: (A)

Piping for residential heating oil must be compatible with petroleum fuels and meet code requirements. A flexible connector is designed specifically for oil lines, providing a tight seal while accommodating movement, vibration, and thermal expansion near the burner. This type of line is rated for heating oil service and is commonly used to connect the rigid piping from the tank to the burner area, making installation easier without sacrificing safety or reliability.

PVC pipe isn’t suitable for oil because it isn’t rated for hydrocarbon fuels and can degrade or fail when exposed to heating oil and higher temperatures. Cast iron pipe is used for drainage and waste systems, not for fuel-oil piping, and it isn’t appropriate for carrying oil. Aluminum tubing isn’t a standard material for oil service due to fuel compatibility and code approvals.