How much temperature drop will occur from the back of the flange to the gasket surface?
When introduced to insert flanges, this is a frequent concern of process engineers and piping designers. A definitive answer is not possible since there are an infinite possibility of combinations and conditions. It is not feasible for a manufacturer to conduct tests and studies to provide answers to all of these conditions. However, the following guidelines can be offered. Getting the jacketed medium (usually heat) as close to the gasket surface of the flange is the obvious first choice. There are several methods for terminating jackets at flanged connections. The most common method is to end the jacket at a closure ring short of the back of a non-reducing (line size) flange so that attachment welds to the pipe can be made to both the hub of the flange and the closure ring so there is space for nuts and bolt heads. Another method is to terminate the jacket right at the back of a reducing flange hub. SIFCO’s reducing insert flanges simulate this second method, bringing the jacket mediu
