tailieunhanh - Alignment of vertical shaft hydrounits - part 5

(iv) Tiếp tục tải mỗi giày cho đến khi một "hit" trên một chiếc giày cùng một phong trào trên quay số chỉ số tương ứng cho giày mỗi. Những đôi giày nên được như nhau được tải vào thời điểm này.(v) Trừ khi những đôi giày rất gần với giá trị như nhau nạp ban đầu, trung tâm của runout đã di chuyển đáng kể. Shim cầu theo thủ tục trong phần một lần nữa plumb các trung tâm của runout. | iv Continue loading each shoe until a hit on a shoe provides the same movement on the corresponding dial indicator for each shoe. The shoes should be equally loaded at this point. v Unless the shoes were very close to being equally loaded initially the center of runout will have moved significantly. Shim the bridge according to the procedure in section to again plumb the center of runout. vi Load all the shoes one more time hitting each shoe equally while watching the dial indicators. As the final shoe is hit the center of runout should be back at its original position. vii Move the shaft so that the centerline of the thrust runner is directly over the center of the turbine bearing housing. Because the center of runout is plumb the center of runout will be concentric with the turbine bearing housing. Lock the thrust runner in place with jacking bolts or bearing segments in preparation for guide bearing installation. See section 8 for guide bearing installation procedures. Procedure for Self Equalizing Thrust Bearing a. Use a precision machinist level to level the upper bridge lower bridge on an umbrella unit . Level must be measured on a machined surface parallel to the surface of the bearing support. b. Take plumb readings with the shaft in the zero degree position and plot the shaft profile. If the dogleg is excessive make corrections as discussed in section . Take clearance readings of the turbine seal rings turbine bearing housing generator stator and generator guide bearing housings if not adjustable. Plot the centerlines of the static components on the shaft plumb plots to determine concentricity. The concentricity should be checked even if the stationary components were centered with a single plumb wire with the rotating components removed. c. Move shaft to center in turbine bearing housing and move the top of the shaft to make it plumb. d. Hold shaft in place at upper guide and turbine guide bearings using jack bolts or bearing segments in .