2 this pipe machine use the dry cast material, there will no waste cement mud, then it wont pollute the environment. 3 during the production, the noise is low, it is about 80-90 db 4 the concrete pipes are with high pressure load and with high production efficiency. Working principle This machine use the roller to support the pipe mould, and produce the roller force to concrete in the mould. When the roller rotate at a high speed, the concrete in the mould will spread in the inner wall of the pipe mould and form a cement pipe with the centrifugal force, and when the mould with the inner concrete pass on the roller, the concrete between the mould and the roller will be compacted solid to form a pipe. According to customer requirement!!