INTUMESCENT FIRE ARRESTER COLLAR FOR PIPELINES.

摘要

A fire collar (10) is supported around a plastics material pipe (30) extending through a bore (32) in a wall (44). The fire collar (10) comprises a cylindrical metal collar (12) carrying a layer of intumescent material (36) on its inner circumferential surface. A sleeve (22) of fire resistant material is attached to the metal collar (10) and extends within the collar and around the pipe (30). In the event of a fire the pipe (30) melts. The intumescent material (36) is constrained to expand radially inwardly and as it does so it pushes the fabric sleeve (22) radially inwardly. The sleeve (22) and the expanded intumescent material (36) together form a physical barrier across the fire collar (10) which blocks the bore (32).