Mill is having planetary gear box and is for a super thermal power project. The Mill is
xrp 1103. However for lower capacity unit worm gear box are used instead of planetary
gear box. In case worm gear box erection of worm gear box in a 500 MW unit becomes
slight problem. The weight of worm gear box for BHEL make XRP 1003 is nearly 67t
which very difficult lift and place in position because feeder floor which is on 19M
height. Clearance of 18.5 M is available for lifting . Therefore it is very difficult to
gear box in the foundation because of foundation restriction. Please take care before
hand .Please note due space constraints cranes size more than 100t/150t is not feasible
to place.
ERECTION SEQUENCE OF MILL WITH PLANETARY GEAR BOX.
| -Foundation:Checking |
| -Foundation: cheeping for grouting |
| -Primary packers Preparation for sole plate and mounting plate |
| -Sole plate & Mounting Plates alignment, elevation, and flatness. |
| -Grouting of sole plate and mounting |
| -Planetary gear box installation |
| -Mill side assembly installation,aligned and orientated . |
| -Concentric checking of gear box with side assembly |
| -Dowel pin installation gearbox with sole plate |
| -Bowl & bowl hub installation |
| -Seperator body erection,aligned and orientated |
| -Ceramic cone erection with support tube |
| -Seperator top erection,aligned and orientated |
| -Airport assembly segment erection & welding |
| -Bull ring segment erection |
| -Mill discharge valve,valve outlet & valve adapter erection |
| -Center feed pipe upper & lower erection and welding |
| -Inverted cone erection |
| -Super bolt tightening and bowl hub insulation |
| -Scraper assembly erection. |
| -Bowl hub air seal erection upper & lower |
| -Grinding roll installed on journal shaft |
| -Journal roller assemblies erection |
| -Journal opening cover erection |
| -Journal spring pre-load set. |
| -Spring Assembly to journal head gap set |
| -Coal sampling platform |
| -Seal air piping erection for MDV( Mill Discharge Valve) |
| -Seal air piping erection for journal roller assembly |
| -Coupling installation on motor shaft |
| -Motor alignment with gear box |
| -LOS Piping fitting |
| -LOS Piping welding |
| -LOS Piping acid cleaning |
| -Hydro test of oil cooler |
| -Planetary gearbox & lube system flushing |
| -Trial run of motor |
| -Motor Final alignment |
| -Mill motor coupling guards installation. |
| -Trial run of mill |
-Ring to roll
gap setting. A ceramic tiles lined inner cone without centre pipe. to be continued. |
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