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cybergibbons's profile
Cybergibbons! (Project Zero Hounslow)
Cybergibbons! (Project Zero Hounslow)
Cybergibbons! (Project Zero Hounslow)
@cybergibbons

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Cybergibbons! (Project Zero Hounslow)

@cybergibbons

Andrew Tierney - security consultant of all things IoT. Bearded James Bond hobbit. Famous for Bitfi.

Lots of places
cybergibbons.com
Joined December 2008

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    Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
    • Report Tweet

    Cybergibbons! (Project Zero Hounslow) Retweeted Ken Munro

    I'm not one to nitpick. Hold up. This figure is totally wrong! As a banana aficionado and ex-container ship bod, I think I may comment.https://twitter.com/TheKenMunroShow/status/1213531227266985986 …

    Cybergibbons! (Project Zero Hounslow) added,

    Ken Munro @TheKenMunroShow
    ...or just for @cybergibbons pic.twitter.com/N0qdLMLgkr
    1:26 PM - 4 Jan 2020
    • 2,058 Retweets
    • 6,557 Likes
    • Christopher Batts QuantumStatist Andrew Schorr Jim Procter Jotto999 Scott Rigby Miranda Peter Tripp Eugene Kartashov
    167 replies 2,058 retweets 6,557 likes
      1. New conversation
      2. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        First up, how many bananas in a container? A standard forty footer holds 20 pallets. There are maybe 6 boxes of bananas per level, 10 levels, and 100 bananas per box? 120k bananas per box.

        10 replies 18 retweets 504 likes
        Show this thread
      3. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        So that's more, right? 120k * 15k = 1.8 GigaBananas? Nope.

        4 replies 11 retweets 388 likes
        Show this thread
      4. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        15,000 containers will be referring to TEUs - twenty foot equivalent units. 120k * 7.5k = 900 MegaBananas? Nope.

        3 replies 9 retweets 372 likes
        Show this thread
      5. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        Is it weight? A banana weighs about 125g. So, around 15tonnes per forty footer. That's far short of the maximum of 28 tonnes.

        2 replies 9 retweets 348 likes
        Show this thread
      6. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        So what is it? It's power.

        2 replies 9 retweets 361 likes
        Show this thread
      7. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        Even the biggest container ships - for example, the Emma Maersk with around 11k fully laden TEUs - only have 1k reefer sockets onboard. Assume those are all filled with forty footers. We are down to around 1k * 120k = 120 MegaBananas.

        6 replies 16 retweets 508 likes
        Show this thread
      8. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        Wow, big difference! But, it gets worse. Those reefer positions all need power.

        2 replies 7 retweets 371 likes
        Show this thread
      9. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        We used to factor around 4kW for a reefer... so that would be around 4MW total. Easy! Problem is, bananas are not average. Most frozen cargo is taken onboard frozen. It doesn't take much power to keep it frozen at -21degC

        2 replies 7 retweets 388 likes
        Show this thread
      10. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        Bananas are different though - they are often packed warm, and brought directly to the ship. They are also kept at +14degC. This means the refrigeration needs to work harder.

        9 replies 7 retweets 418 likes
        Show this thread
      11. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        We are now looking at as much as 20kW to cool that container when it comes onboard, and 8kW to maintain the temperature. We've jumped to 8MW at least! That's changed what you are doing in the engine room.

        4 replies 9 retweets 369 likes
        Show this thread
      12. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        Each of the 5 generators on the Emma Maersk is around 4MW. You are now running 3 generators just to keep the ship running in port!

        2 replies 6 retweets 356 likes
        Show this thread
      13. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        Worse still, the shaft generator (the thing that recovers power from the main engine) is only 8.5MW. You are now having to run extra generators. Not economical. But doable.

        2 replies 6 retweets 331 likes
        Show this thread
      14. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        So where does all that heat go from the refrigerated containers? The air. That's fine above the hatches. But what about below the hatches? Well, you need fans. And a lot of them.

        2 replies 7 retweets 340 likes
        Show this thread
      15. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        No container ship I worked on had enough below hatch ventilation to handle 100% bananas. 100 containers dumping 8kW of power under a hatch is a lot. Total guess, but I don't think you'd manage more than 75% of reefer being at full load.

        7 replies 26 retweets 524 likes
        Show this thread
      16. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        So I think at best... we have 750 * 120k = 90 Mega Bananas. Enough for everyone in the UK and me.

        8 replies 20 retweets 557 likes
        Show this thread
      17. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        How do shipping companies handle this? Well, there are actually special banana ships - they are open hatch and can easily handle the load. Anyway, hope that was fun :)

        38 replies 40 retweets 1,264 likes
        Show this thread
      18. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 4
        • Report Tweet

        This is what happens when you just multiply containers by how much you think is in them.

        47 replies 22 retweets 1,257 likes
        Show this thread
      19. Cybergibbons! (Project Zero Hounslow)‏ @cybergibbons Jan 5
        • Report Tweet

        Cybergibbons! (Project Zero Hounslow) Retweeted Cybergibbons! (Project Zero Hounslow)

        For those of you interested in what the engine room of a container ship looks like, I posted some pictures last year:https://twitter.com/cybergibbons/status/1176182170546835456 …

        Cybergibbons! (Project Zero Hounslow) added,

        Cybergibbons! (Project Zero Hounslow) @cybergibbons
        A couple of days ago, I talked about an "engine the size of a house". It's a not an exaggeration. What are the engines and other equipment like on a container ship? This is a 66,000gt ship, approximately 280m long. Rated about 5500 TEU. This is the top of the main engine. pic.twitter.com/v8CFDrClpf
        Show this thread
        24 replies 63 retweets 568 likes
        Show this thread
      20. End of conversation

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