Monday, 21 May 2012

Sea Trials Diary - Monday 21st May

AM is back in Manila for a day before heading back home. Key components of the Main Engine have been opened up for inspection and corrosion, as a consequence of the water contamination, has been found on bearing surfaces and in the oil channels.
Corrosion on the inside of the lube oil pipes
The inside of the pipes are not coated on the basis that they will be immersed in lubricating oil for their working life.

Bearing pin with corrosion on the load-bearing surface
The Main Engine manufacturers are mobilising a team to polish the bearing surface 'in situ', which will take another week alongside. In the meantime, work is continuing on finishing work and painting before the naming ceremony at the end of this month.

It now seems unlikely that the AM will see PN65 undergo her sea trials, but another seven to go...

AM, in Manila
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5 comments:

  1. Anonymous24 May 2012 at 04:45

    AM. Enjoy your Blog. I work for a BWTS manufacturer in the US, N.E.I. Can I ask is this BWTS fitted the new "slip or side" stream unit or the original full flow system w/o filters? Good luck finding the source of the lube oil water.

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  2. The Antipodean Mariner24 May 2012 at 09:34

    Hi there, nice to get feedback on the Blog. We chose Techcross 'full flow' electro-chlorination system for the series, which is not filtered but can handle the big volumes (6,000 tph with both ballast pumps). However, most ballasting will be done at the discharge port and only in unusual circumstances will we have to treat at the loading port(de-ballasting).

    The source of the water appears to be have been isolated to an insecure pipe flange connection on the tank-top. Water was also found in her sister-ship but no damage as the engine hasn't been run. New sea trial in early June is planned.

    AM

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  3. Anonymous25 May 2012 at 04:18

    Good that you caught the oil issue before running the engine on the sister ship. All the best for her sea trial.
    I was just reading Samsungs BWT paperwork, they are using a degassing unit for H2 on their electrochlorination system. Is that what the gas monitor was for that I think I saw on the deck in one of your pictures?

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  4. The Antipodean Mariner25 May 2012 at 11:12

    The free H2 was raised as an issue before sea trials, but the readings as we ballasted tanks and a cargo hold were as predicted - about 4% of Lower Explosive Limit (i.e. 96% safety margin).The Trent Severn system has an H2 venting device but is dealing with concentrated 'side slip' chemicals and not 'full flow'. AM

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  5. Anonymous26 May 2012 at 03:07

    Yes it is amazing to me, one treatment technique can have so many varyations in approach; with and w/o H2 seperation, filters, side stream, hi-low TRO, with or w/o temp and salinity limits etc etc. In time we'll see how many go the way of Unitor.
    H2 should not be an issue unless fresher waters are treated but I don't think that is going to be an issue for your vessels.

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