Speaker
Dr
Alberto Lapina
(MAN Diesel & Turbo)
Description
The exhaust valve spindle is one of the most challenging components in the marine two-stroke diesel engine. It has to withstand high mechanical loads, thermal cycling, surface temperatures beyond 700 $^{\circ}$C, and molten salt induced corrosion.
Powder metallurgy gives the opportunity of improving the component using materials not applicable by welding or forging. Therefore exhaust valve spindles have been produced by Hot Isostatic Pressing (HIP) with a spindle disc coating of a Ni-Cr-Nb alloy that cannot be manufactured by welding or forging.
This paper presents the service experience gathered by MAN Diesel & Turbo in a number of service tests on ships (up to 18000 running hours): corrosion and degradation phenomena in the spindles produce by HIP are presented and compared with the performance of state-of-the-art exhaust valve spindles.
The macroscopic geometrical changes experienced by the spindles are studied by means of Finite Element Method (FEM) calculations and strategies for further development of the component are outlined.
| Please choose topic | Power Generation |
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Primary authors
Dr
Alberto Lapina
(MAN Diesel & Turbo)
Mr
Harro Andreas Hoeg
(MAN Diesel & Turbo)
Co-authors
Dr
Jakob Knudsen
(MAN Diesel & Turbo)
Prof.
Jesper Henri Hattel
(Technical University of Denmark)
Mr
Rune Møller
(Technical University of Denmark)
Mr
Tomas Berglund
(Sandvik Powder Solutions)
