Page 260 - Water Standards
P. 260
7 Inspection of bearing parts and the adjustment of the gap shall meet the following re⁃
quirements:
1) After shaft adjustment, the contact conditions of the contact surface between the
main shaft and the lower bearing liner, and the contact surface between the thrust
pad and thrust collar shall be checked by barring. The contact conditions shall
meet the requirements of Item 1 in this article.
2) For the determination of the axial gap between the bearing liner s two ends and
shaft shoulder, the main shaft s expansion at a speed of 0 011mm/ ( m·℃ )
shall be taken into consideration when the rotor runs under the highest temperature
rise. The gap shall ensure the rotor s free expansion when running.
3) The thrust bearing axial gap (main shaft movement) shall be between 0 3mm and
0 6mm (the larger value applies to larger shafts).
4) The fitting between the bearing liner and shell shall meet the following require⁃
ments:
—For cylindrical bearing liners, there shall be no gap between the upper bearing
liner and bearing cover, and there shall be 0 05mm of compression. The lower
bearing liner and the bearing seat shall be in close contact and the load⁃carrying
surface shall be more than 60% of the total surface.
—For spherical bearing liners, the contact area between the spherical surface and
the spherical bearing seat shall be about 75% of the total spherical surface and
the contact shall be uniform. When the bearing cover has been tightened, the
gap between the liner and the spherical bearing seat shall meet the
manufacturer s requirements
5 ) The gap between the sealing ring and the shaft shall meet the drawing
requirements and shall be about 0 2mm. During installation, the gap between
opposing halves shall be no larger than 0 1mm and there shall be no misalign⁃
ment.
8 Fan installation shall meet the following requirements:
1) The fan s surface shall be smooth and clean and have no fissures and other me⁃
chanical damage.
2) For fans which are installed on site, the bolts shall be tightened according to the
manufacturer s requirements and shall be locked. Spring washers shall not be used
and gas cutting and electric welding on the fan shall be avoided.
3) The gap between the fan blade and air ducting device shall be uniform and the de⁃
viation shall be no larger than ±20% of the actual average gap.
4) The distance between the fan s end face and air ducting device s end face shall
2 5 3