Tuesday, June 23, 2020

Tailshaft Survey

Tailshaft Condition Monitoring System:
  • Complete tailshaft survey will be required if the last complete tailshaft survey was carried out more than five (5) years prior to the initial survey
  • For vessels with TCM notation, tailshaft survey interval required by 7-2-1/13.1.3 will be extended up to 15 years provided:
  • Annual surveys are carried out to the satisfaction of the attending Surveyor, and
The following are carried out at each tailshaft survey due date required
  • Bearing weardown measurement
  • Verification that the propeller is free of damage which may cause the propeller to be out of balance
  • Verification of effective inboard seal
  • Renewal of outboard seal in accordance with manufacturer’s recommendation
Complete tailshaft survey may be waived subject to satisfactory review of the following records for appropriate period as considered necessary
  • Stern bearing oil analysis records
  • Stern bearing oil consumption records
  • Stern bearing temperature monitoring records
  • Tailshaft, stern bearing assembly and propeller operation and repair records
  • Stern bearing clearance and wear down measurement records
Tailshaft Survey
METHOD 1

The survey is to consist of:
  • Drawing the shaft and examining the entire shaft, seals system and bearings
  • For keyed and keyless connections
  • Removing the propeller to expose the forward end of the taper,
  • Performing a non-destructive examination (NDE) by an approved surface crack detection method all around the shaft in way of the forward portion of the taper section, including the keyway (if fitted). For shaft provided with liners the NDE shall extended to the after edge of the liner.
For flanged connection:
  • Whenever the coupling bolts of any type of flange-connected shaft are removed or the flange radius is made accessible in connection with overhaul, repairs or when deemed necessary by the surveyor, the coupling bolts and flange radius are to be examined by means of an approved surface crack detection method
  • Checking and recording the bearing clearances.
  • Verification that the propeller is free of damages which may cause the propeller to be out of balance.
  • Verification of the satisfactory conditions of inboard and outboard seals during the reinstallation of the shaft and propeller.
  • Verification of the satisfactory conditions of inboard and outboard seals during the reinstallation of the shaft and propeller.
METHOD 2
The survey is to consist of:
 
For keyed and keyless connections:
  • Removing the propeller to expose the forward end of the taper,
  • Performing a non-destructive examination (NDE) by an approved surface crackdetection Method all around the shaft in way of the forward portion of the taper section, including the keyway (if fitted).
For flanged connection:
  • Whenever the coupling bolts of any type of flange-connected shaft are removed or the flange radius is made accessible in connection with overhaul, repairs or when deemed necessary by the surveyor, the coupling bolts and flange radius are to be examined by means of an approved surface crack detection Method
  • Checking and recording the bearing wear down measurements.
  • Visual Inspection of all accessible parts of the shafting system.
  • Verification that the propeller is free of damages which may cause the propeller to be out of balance.
  • Seal liner found to be or placed in a satisfactory condition.
  • Verification of the satisfactory re-installation of the propeller including verification of satisfactory conditions of inboard and outboard seals
Pre-requisites
  • Review of service records.
  • Review of test records of:
  • Lubricating Oil analysis (for oil lubricated shafts), or
  • Fresh Water Sample test (for closed system fresh water lubricated shafts).
  • Oil sample Examination (for oil lubricated shafts), or Fresh Water Sample test (for closed system fresh water lubricated).
  • Verification of no reported repairs by grinding or welding of shaft and/or propeller.
METHOD 3
The survey is to consist of:

  • Checking and recording the bearing wear down measurements.
  • Visual Inspection of all accessible parts of the shafting system.
  • Verification that the propeller is free of damages which may cause the propeller to be out of balance.
  • Seal liner found to be or placed in a satisfactory condition.
  • Verification of the satisfactory conditions of inboard and outboard seals.
Pre-requisite
  • Review of service records.
  • Review of test records of:
  • Lubricating Oil analysis (for oil lubricated shafts), or
  • Fresh Water Sample test (for closed system fresh water lubricated shafts).
  • Oil sample Examination (for oil lubricated shafts), or Fresh Water Sample test (for closed system fresh water lubricated).
  • Verification of no reported repairs by grinding or welding of shaft and/or propeller

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