how to connect the fireproof two-layer tube plumbing flange-shaped cast-iron drainage pipe fittings

摘要

PROBLEM TO BE SOLVED: To provide a connecting method for easily replacing a lead drain pipe installed to a flange shape castiron pipe joint, with a fire resistant two-layered pipe made of an inner pipe of a hard vinyl-chloride pipe, and covered with a cement mortar outer pipe in the outer periphery thereof.SOLUTION: A synthetic cylindrical adapter flange has: a connecting opening opened in a funnel shape, and fitting in a tapered lead pipe connecting opening; a joining flange connected to the flange of a pipe joint; and a connecting opening to which the inner pipe of the fire resistant two-layered pipe, and the adapter flange is mounted to the flange shape castiron drain pipe joint. After the inner pipe is connected to the adapter flange, the outer periphery of the adapter flange is covered with a bushing made of cement mortar.