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大庆油田热电厂汽轮机型号为CC140/N200-130/535/535型,机组的低压缸为单层对称分流结构,由低压中段和2个排气缸三部分组成,气缸由HT20-40灰口铸铁铸成,2004年大修中在低压缸法兰内侧下部共发现5条裂纹。最长的裂纹长500mm,从裂纹的表面位向看,有轴向的,也有周向的。从裂纹的空间位置看,有的和所在表面成30°~45°夹角,有的基本垂直,需要进行补焊。
The steam turbine model of Daqing Oil Field Thermal Power Plant is CC140 / N200-130 / 535/535. The low-pressure cylinder of the unit is a single-layer symmetrical diversion structure and is composed of a low-pressure middle section and two exhaust cylinders. The cylinder is made of HT20-40 gray cast iron In 2004 overhaul in the lower part of the inner cylinder flange were found five cracks. The longest crack length 500mm, from the cracks in the surface position to see, there are axial, but also the circumferential. From the crack space location, and some of the surface where the angle of 30 ° ~ 45 °, and some basically vertical, the need for welding.