| 摘要 |
A high temperature bolting system (16) for clamping steam turbine housings (10) while operating at a temperature of 800 to 1200 degrees F. An elongated fastener shank (20) has a similar coefficient of thermal expansion as the housings sections (12, 14). The shank has a tensile strength several times greater than the housing to maintain a clamping force during thermal excursions, and a much higher creep strength than the clamped parts. A stress generating flange (28) is provided with jackbolts (34) to establish the clamping load at room temperature. A threaded sleeve (54) is interposed between the threads at the end of the shank and the threads of the housing so that the housing threads have a sufficiently large area for withstanding the clamping load. A flanged support ring (64) is mounted at a bolt hole in the flange to support a load bearing area when retrofitting existing housings. |
