The Activities for improvement of hot environment in undergrounding pipe-space(trench), 1; The Decrease of the radiant heat from steam pipe

Ishiyama, Toru ; Kawasaki, Ichio ; Matsumoto, Takenari; Terada, Hideyuki; Kikuchi, Akio; Mizoguchi, Tsuyoshi*; Ikede, Hiroyuki*

In the undergrounding pipe-space, there are many pipes for utility (electronic cable, water, gas, steam, etc.). These pipes are kept to safe by daily inspection. But hot environment of the pipe-space affects badly the device and a laborer's health. The investigation of the heat distribution was carried on, therefore it was found that the radiant heat around the valve was very much. The method of thermal insulation was examined from the view point of the shape, cost, and effect. Then some of valves were covered with flexible thermal insulation, and the temperature of the area around the covered valves was decreased about 10C.