Abstract: A pipe rupture restraint and shield diffuser assembly is installed on a pipe at a location where the pipe is subject or postulated to rupture and includes a cylindrical casing surrounding the pipe and having holes therethrough and a plurality of diffuser rings disposed in longitudinally spaced relation in an annular space between the casing and the pipe to form flow obstructions along the annular space whereby upon rupture of the pipe jet flow is diffused by flow past the diffuser rings and through the holes in the casing. The assembly can be attached directly around the pipe or can be independently supported.