... 2.suitable work piece diameter:50-300m 3.high pressure sandblaster 4.surface treatment,descalin Pipe inner ... BC-NB Series sandblasting device is a pipe wall supporting the use of special equipment for blast cleaning. ... wall coating. After cleaning the surface after the quality and grade of up to Sa2, Sa3. The ... safe, reliable, easy to maintain and maintenance. High Quality Pipe Inner-wall Sandblaster