‘Round Table’ looks at cold corrosion

21 May 2014
Owners, oil suppliers and engine designers met in Hamburg to discuss cold corrosion at a round table event hosted by ExxonMobil and ‘The Motorship’

Owners, oil suppliers and engine designers met in Hamburg to discuss cold corrosion at a round table event hosted by ExxonMobil and ‘The Motorship’

The subject of cold corrosion came under the spotlight at a round table discussion hosted by ExxonMobil and 'The Motorship' in Hamburg on 20 May.

Six representatives of high-profile ship owning and managing companies were involved, along with ExxonMobil, with MAN Diesel & Turbo’s customer support director Kjeld Aabo representing the engine companies. The Hamburg location was chosen for its convenience for shipowners and because The Motorship’s 36th Propulsion & Emissions conference is taking place at the same venue on the following two days.

A full report will appear in a forthcoming printed issue of The Motorship, but the basic ‘take home points’ summarised by chairman Lars Robert Pedersen, deputy secretary general of BIMCO, were:

  • The engine companies stress the need for high base number lubricants in later-design engines, particularly when slow steaming;
  • For these later type low speed engines onboard scrape down oil analysis should be promoted;
  • Charterers need to be educated in correct operation of engines at loads below the engine design load profiles; and
  • The use of 0.1% sulphur fuel will be a major challenge to the industry, with no low speed engine ships yet operating on such fuels there are no opportunities for sea trials in advance of the legislation.

ExxonMobil presented its Mobilgard 5100 100BN cylinder oil, saying that not all 100BN oils were of the same quality or performance, a view backed by MAN, and spoke about the introduction of a new on-board kit as part of its cylinder condition monitoring service. The kit allows instant measurement and display of ferrous iron content of a cylinder scrape-down oil sample.

For the engine companies, Mr Aabo was frank in his admission that in the effort to get considerably higher efficiency in the entire load range the cold corrosion problem had taken them by surprise. Although it is far from a new phenomenon and, under control, it has beneficial effects for cylinder lubrication, the problem arose with lower operating temperatures causing things to get out of control and it took some time for the industry to find, and agree on, suitable actions to stabilise the problem. The introduction of 100BN oils has gone a long way to solving the problem, and MAN is working on means of raising the temperatures of cylinder liners both on existing engines and as part of new designs.

The shipowners, however, felt that there were likely to be further challenges ahead, particularly in educating those on board and in operating on low sulphur fuels, for which the cylinder lubrication selection is still unclear.

Links to related companies and recent articles ...

Mercator Media Ltd

view more

MAN Diesel & Turbo

view more