What technique can facilitate inserting a tight-fitting inner sleeve into a tubular repair?

Chilling the inner tube while heating the outer tube is an effective technique for facilitating the insertion of a tight-fitting inner sleeve into a tubular repair. This method takes advantage of the thermal expansion and contraction properties of materials. When the outer tube is heated, it expands, creating a larger diameter, while cooling the inner tube reduces its diameter. This combination makes it significantly easier to fit the inner sleeve into the outer tube without risking damage to either component.

Heating both tubes equally might not create the necessary difference in size to ease the insertion process, while using grease for lubrication can lead to complications, such as slippage during the insertion, that might not solve fitting issues effectively. Forcing the inner tube in manually can lead to deformation or damage to the components being joined, which could compromise the structural integrity of the repair. Therefore, the technique of chilling the inner sleeve and heating the outer sleeve is the most efficient and safest method for achieving a successful fit.