1. It must be made on a clear site; get rid of the oil pressure of the pipe to prevent oil spurting;

2. Pipes must be well marked before disassembly to prevent from later confusion.

3. The dismantled oil pipes should be cleaned with wash oil before dried in the air, and the pipe ends should be filled with plastic plugs to prevent foreign article from entering into the pipe. Take care with pipeline thread and o-shape ring in the ring flange.