In-situ Turbine Journal Repair
When a turbine journal has been scored by a bearing wiped through loss of lube oil, or worn after years of service, we machine and lap it in place – the rotor stays where it is and does not need to be turned.
A loss of lube oil that wipes a bearing, or simply long service, can leave a turbine journal badly scored and worn. In-situ journal machining combines turning and lapping in a single setup to restore the damaged journal where it is. The rotor does not have to be pulled or turned, so there is no need to ship it to a workshop.
References: journal repairs on the 200 MW unit at Shengli Power Plant, the 300 MW unit at Daba Power Plant and the 300 MW unit at Tianjia'an Power Plant. In December 2009 the in-situ journal repair on the 1,000 MW unit at Haimen Power Plant (under Dongfang Turbine Co.) passed expert review and acceptance.
Equipment and tube materials
- Scored or worn turbine rotor journals
- Repairs on record for units from 200 MW to 1,000 MW
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Work sequence
- Measure the journal damage on site
- Mount the in-situ machining rig
- Turning
- Lapping
- Dimensional and surface inspection
- Acceptance
Schedule
Past repairs have typically taken around five days, depending on the extent of the damage, journal size and site conditions.
Quality control
- Dimensions measured before and after the repair
- Surface finish inspection
- Acceptance to the owner's requirements
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