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bens

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Posts posted by bens

  1. This case is in all the news circulars in my world today

    Posting links for wider circulation

     

    The inspections were being done but communication of the findings was not happening

     

    Awful to read really.

     

     

    WWW.IOSHMAGAZINE.COM

    Newcastle City Council has accepted responsibility for failing to properly manage the risk of a decayed willow tree that...

     

    • Sad 1
  2. I did L2 and agree a lot of the HCC notes were figuring out what the question was.

     

    I would think it through as.

     

    a) Do a tree risk assessment.

     

    b) Question 1.1 first part - If you were making your own tree risk assessment form what information would you gather on it and why

     

    c) Qeustion 1.1 second part - referencing the tree you have just gone out and risk assessed, give examples of why the following headings in our question are useful.

     

    d) Question 1.1 third part - take some photos of the tree you risk assessed.

     

    e) Question 1.2 first part - using BS3998 in your answer explain five reasons why there is a risk assessment process. Why bother to check the same variables on each tree. Instead we could just go up to each tree and make a decision if any work needs doing on it. What could go wrong with that latter approach if you were distracted or having a bad day?  What if someone forgot something?

     

    f) Question 1.2 part i) would hint that it looks like its kind of asking you whether its better to find the cause and implication of any defects or if its better to just cut every tree with a defect down and charge the owner accordingly.

     

    g) Question 1.2 part ii) what common defects or problems should every tree surveyor know about before they are allowed out.

     

    h) Question 1.3 first item. Record your risk assessment on the form which is in the course notes. They give three outcomes in their hazard rating - immediate action needed - reinspect (when?) - dead tree.

     

    i) Question 1.3 part i) on the tree you looked out what defects did you find and do they matter. Does the defect matter in that species. Is there a target. How likely are the defects to make the tree fail or hit a target or cause other consequence.

     

    j) Question 1.3 part ii) could you use any of the sections in BS3998 to treat the tree and prevent harm. Example could you lift the crown per Section 7.6 of the BS to reduce the risk of busses striking the branch etc. If you don't have a copy of the BS it can be difficult to reference the sections. Tree life ac uk do a mini guide which is useful. I can't remember where the attached image folder came from but it contains some section references.

     

    BS3998 tb1.PNG

    • Like 1
  3. 33 minutes ago, Macpherson said:

     

    Fair enough, I suppose thinking about it everything that has moving parts will have vibration that can be measured and quantified and manufacturers are required supply the m/s squared figure. 

     

    The amplitude of the vibes is probably more important, if that's the right expression.... although frequency must also be an issue.

     

    I'm sure someone else can explain this better than me.

     

     

    The vibration is triaxial and can be measured using an accelerometer

     

    You can also get tool tags which you stick on the tool then plug into a computer at the end of the shift and they give you an exposure readout. But you have to pay the tag maker for the software license and unless you have several operators its a bit of an outlay.

     

    The manufacturers tool instruction books should give two ratings in m/s squared - one is the vibration of a new saw in factory conditions and the other is the 'k' factor which is the inaccuracy in measurement.

     

    If you are interested in the H&S bit then to get the recommended maximum use time you are supposed to add both figures together and put them in the reckoner spreadsheet which gives you a guide use time to include in a risk assessment. People often overestimate use time which only really counts when you are cutting and getting feedback through your hands as this is when the capilleries and nerves in your fingers are being shaken. But if you use several tools a day all of them supposed to be factored in to the vibration calculation.

     

    The HSE book on vibration requires employers to not expose operatives over the upper limit level, several Councils and housing associations have been prosecuted for exposing their workers to high levels for years made the workers disabled. HAVS when diagnosed is also a RIDDOR reportable.

     

    The only exception in their book called L140 tends to be reactive emergency clearance work but then you would need to offset the over-exposure on that day by not working the following day(s) and it should not be regular event etc.

     

    Its a bit of a minefield for employers to be honest and even safety professionals find it difficult

     

    Vibration levels increase as blades get blunt, moving parts get worn and springs get worn out too so a year old saw will have higher vibration which the instruction book value doesn't really consider.

     

    Having measured people using tools other factors make a huge difference a death gripped tool with locked wrists will cause the user higher exposure and risk damage to upper arms / carpal tunnel etc. I have noticed technique between people on the same tool change the reading by 3.5ms.

     

    The weather and & the effects of cold also make a difference as the blood will retreat making the capilleries and nerves more easily damaged esp. with cumulative exposures. The type of wood being cut can also make a difference to the reading.

     

    Despite their marketing anti-vibration gloves tend to be seen as a bit of a con in H&S and operators feel over protected then end up with a worse exposure than if they didn't use them

     

    In my limited experience good employers often do some form of time management for tools considering the ones in use and conditions and get health surveillance checks for their workers.

     

     

     

     

     

    • Like 1
    • Thanks 1
  4. Using teak oil and decking oil i've found you have to get the carving really clean before you coat it when you have done a lot of fine sanding on it first. The tiny wood dust particles seem to group up within the oil and spoil the finish ifs its not been jetwash first

     

    Have used decking oil on a couple of pieces which worked ok, much thinner and easier to paint on the carving.

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