Flexible connectors may be used on oil piping in residential installations.

• A. True
• B. False
• C. Not allowed
• D. Sometimes

Answer: (A)

Flexible connectors are allowed in residential oil piping to absorb vibration and small movements, reducing stress on rigid pipes and fittings. They’re useful when the burner and fuel supply must be connected in a way that can tolerate slight misalignment or equipment vibration, such as near the burner or at the connection to the tank, without forcing rigid piping to take all the stress. The connectors must be listed for fuel-oil service and installed in accordance with the manufacturer’s instructions and applicable codes (often NFPA 31), ensuring the correct size, pressure rating, and compatibility with the system. They should be kept short, well-supported, and protected from heat, damage, and undue bending to prevent fatigue or leaks. When used properly and within code, using a flexible connector on oil piping in a residential installation is appropriate.