What type of fittings must be used for connections of supply or return oil lines located outside?

The use of flare frost fittings for connections of supply or return oil lines located outside is significant because these fittings are specifically designed to withstand cold temperatures and prevent leaks in outdoor conditions. Flare fittings create a strong, reliable connection by flaring the end of the tube and using a fitting that grips the flare, which minimizes the chance of leaking due to thermal expansion and contraction of the materials in varying weather conditions.

This makes flare frost fittings particularly suitable for outdoor applications where oil lines may be subjected to harsh environmental factors such as freezing temperatures, which could lead to brittle materials or weakened connections. Opting for flare frost fittings ensures enhanced durability and performance in settings that are not climate-controlled, providing an effective solution for maintaining the integrity of oil line connections.