| 摘要 |
PROBLEM TO BE SOLVED: To prevent contamination from being accumulated at an inner surfaces of a pipe having pipe joint constituting a piping and a joint having a connection surface.SOLUTION: This invention comprises: a pipe having a joint of such structure as one in which the joint is inserted into an end part of the pipe constituting a piping, a connection hole of the joint and the inner surface of the end part of the pipe are melted and bonded and at the same time an outer periphery of the pipe and the joint are welded; a joint having a connection surface constituted by a main body provided with a connection surface to which the joint of this pipe can be connected, the joint of the pipe are connected by bolts at the connection surface of the joint to constitute the piping, and the inner surface is made smooth while no clearance and no cavity are present in the constituted piping. |
