PROJECT FACTS

Vessel

M/T Minerva Emma

Engine

Mitsui B&W 6S60MC-C (18,395 HP)

Tonnage

107,197 DWT

D/D Location

Besiktas Shipyard, Yalova, Turkey

Reamer bolts holes M/E side [mm]

85 (10 pcs)

Reamer bolts holes propeller side [mm]

80 (10 pcs)

Intermediate shaft Dia X L [mm]

Ø 495 X 8,600

Propeller shaft Dia X L [mm]

Ø 590 X 7,290

 

I. PANTACHOS - A. VENTOURIS S.A. received an enquiry from MINERVA MARINE INC. to perform several in-situ machining repairs related to vessel’s shafting arrangement.

More specifically, during DD and dismanting of the shafting arrangement, it was found that several reamer bolts from the M/E side could not be extracted by the shipyard with the commonly used practices. As a result, the dismantling process had to stop until a solution could be found.

In addition, regarding the propeller side, despite the fact that the reamer bolts could be extracted by the shipyard, the holes’ surface was severely damaged.

Our company quickly responded to the enquiry, discussed the job’s scope and repair procedures with the Company’s technical representative and was promptly awarded the job.

We immediately started the preparations and modifications needed to carry out the requested repairs. Meanwhile, we started the fabrication of all reamer bolts (oversize) for both M/E side and Propeller side in our workshop, to be fitted after in- situ machning completion.

Rectification process followed:

  • In- situ drilling of M/E side reamer bolts (standard Ø 85 mm), with the aid of special HSS drills,
  • In situ reaming of intermediate shaft- crankshaft 10reamer bolts’ holes ( Ø)
  • Conduction of honing for 0.01 mm accuracy.
  • Micrometric measurement of holes after machining and honing.
  • In situ reaming of intermediate shaft- propeller shaft 10 reamer bolts’ holes ( Ø80 mm.)
  • Conduction of honing for 0.01 mm accuracy.
  • Micrometric measurement of holes after machining and honing.

The above mentioned machining procedures were completed successfully owing to

  • the use of our own special, custom-made equipment,
  • the provision of our own special carbide cutting tools and
  • the high technical expertise and advanced know-how of our service engineers.