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Brian Robson

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Posts posted by Brian Robson

  1. Accident???

    Bomb making also springs to mind, 500kg is a significant amount and not everyone is enthralled with the current military government.

    There is also the ongoing conflict in the south which over the years has been linked to bombs in Bangkok.

    In Afghanistan and Iraq, Potassium chlorate has surpassed fertilizer as the explosive of choice for insurgents.

    The shift to potassium chlorate from ammonium nitrate fertilizers is significant because the material is easier to

    acquire and turn into an explosive than fertilizer, is nearly as powerful, and it costs even less.

    Let us hope that a through investigation follows up on this possibility to ensure the safety of the public.

    I concur, having had some experience in my younger days making chlorate bombs.

    It would only explode with some force if contained in a cylinder (gas?). Loose chlorate (oxidiser) and fuel (oxidant) would just flare intensely without causing an explosion.

  2. Hydrogen sulphide gas is not only toxic and flamable, it also builds up in the body, plus when it burns phosgene gas is released, and that gas displaces oxygen in the blood stream, learnt about that as part of my navy training.

    Hey, a lot of gas experts here, but this one is not quite correct as was the comment about 'hydrogen embrittlement' which usually occurs with Hydrogen gas at high pressure. H2S is corrosive however in the presence of moisture.

    Burning H2S forms SO2 gas, not Phosgene (COCL2).

    H2S is as poisonous as Cyanide gas (HCN) and blocks the transport of Oxygen in the body.

    The gas is being formed by a build up of anaerobic sludge in sewers, and I bet they don't have personal gas monitors to go down there!

    • Like 1
  3. will they ever learn?????

    I was a laborer in a US oil refinery over 40 years ago and back then they wouldn't let us go into a tank or even a pipe trench until a safety officer gas tested it first with a small hand held device. So I guess not.

    And you had to sign a Confined Space Entry Permit.

    The minimum would be a Trigas device to measure Oxygen, Flammables and H2S (Rotten egg smell). There are 4 and 5 gas models available too.

    Don't ever go into a confined space without confirming the air quality. Even an old rusty tank or ship bilge can be low in Oxygen, due to rusting of iron!

    • Like 1
  4. Absolutely a shocking state of affairs in Thailand when it comes to earthing!

    As CTO states.

    In South Africa it is compulsory to have a 20mA earth leakage breaker on the main switchboard.

    I can feel current leaking from laptop and DVD player chassis on occasion in Thailand.

    No wonder fires and electrocutions are common.

    Thanks for the info on how to sort this out fairly cheaply wai.gif

  5. Recently I had some shelled pecans sent to me by USPS. They were held in BKK for 10 days before the were released. The following note was in the box from BKK customs. "The Customs Department would like to inform you that the import of food, supplements, vitamins, medicines and cosmetics via international postal service requires prior licensing from the Food and Drug Administration as they are restricted according to domestic law. In case of breaking such law punishment will be applied and goods may be seized. For further information please contact FDA in BKK at 02 575 1008"

    I had to pay 800 Baht to the main post office in Chiang Rai. For sure they have started to crack down on postal shipments.

    It's becoming an increasingly irksome issue!

    I have my diabetic/BP medication sent from the UK which normally took about 5 days. Three months ago it took two weeks and the last delivery 3 weeks after being opened. It's declared as diabetic medication and all prescription info is put in the package.

    Thanks for that FDA number.

  6. I can suggest one thing.

    Quote: "But it turns out I still don't get it. For example if you give clear instructions for something to be done and they do something else, or don't do it at all. How do you tell them they got it wrong without embarrassing them and having a big pout session."

    This is a cultural issue I experienced in Africa. If you give a set of instructions and ask if they understood, they will always say "yes" as it is considered disrespectful to say "no".

    The answer is to request them to repeat your instructions back to you, to ensure they have understood!

    • Like 1
  7. I overtook a pickup full of Thai workers as the road was rough. A couple of minutes later I was being chased down the road on my motorbike with the Thais shouting and waving at me! They caught up with me at a junction, and handed back two bottles of engine oil which had fallen out of my saddlebags. thumbsup.gif

    • Like 1
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