BODY WALL MANHOLE FOR LARGE POLYETHYLENE TANK AND METHOD FOR FORMING THE MANHOLE

摘要

PROBLEM TO BE SOLVED: To provide a body wall manhole for a large tank, which uses less number of packings and has little leakage of liquid.;SOLUTION: A manhole body 21 is made of polyethylene. In the manhole body 21, a flange 24, which enables a lid 26 to be liquid-tightly attached or detached, is integrally formed at an outer end, and an inner end face 22, which serves as a weld face, is planer. A planar seat 23 is formed on a body wall 20 of a large tank. The inner end face 22 of the manhole body 21 is welded to the seat 23. A hole 28, through which a man can pass, is defined in the body wall 20 of the manhole body 21.;COPYRIGHT: (C)2001,JPO