Oil removing method for a pipe coil

摘要

A pipe coil is heated in the furnace of a heat treatment apparatus. The oil adhered to the inside of the pipe is vaporized by this heating. In this state the oil removing gas is fed at one end into the pipe which gas is in the high temperature enough to maintain the vaporizing condition of the oil. The vaporized oil within the pipe is discharged by the feeding of the gas at the other end of the pipe while the oil is in the vaporized state.