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    • Reinforcing some of the comments made already ... in my opinion, CDM 2015 is good legislation and not about blame. The whole point of CDM is being organised and clear about who's doing what. That's a good thing for any project and will help it run not only safely but also well.   I also agree with comments made already that the usefulness of a RAMS in inversely proportional to its length. There's good advice and templates on the HSE web site about all this.
    • @jack it was who told me  -years ago- to make a plan and stick to it - and then to take photos of what actually happens and tag them so the photos are searchable.  Or repent at leisure. Well thats what I'm doing now : repenting. This post is about trying to make the best of it  - by building a grease trap. This thread is about how to design build and install one    We had no idea where our kitchen sink was going to be. So instead of being able to duct the foul drain out under the foundation, I had to bodge. Drill a 50mm hole in the wall after the sink was installed, pipe it to a trap outside the house.  It worked for a while, and worked well.   Until she decided that it would be great to have a kitchen garden.    Some plant roots push soil up and outwards. Not a lot of people know that. I do - now. The plants picked up the pipe bedding that was round the drain and dumped a great deal of it inside the drain. It took me a year or more to notice it.   I had no idea that pipe bedding  was really good at filtering kitchen fat and waste. Man did it stink ! But through it all, the kitchen sink drained fine. Slowly, but well enough for us not to notice a problem: until I did.   Based on @saveasteading 's post here  I thought I'd  design, build and install our own - in parallel with the current system. And then switch systems once the grease trap is shown to work properly.   I've looked at grease traps online now for a while. They're either to expensive or too small, or frankly sloppily designed.    The trap needs to be easily maintained. Easy and quick to empty as well as easy to clean.   My first question is how big ( volume ) should it be? Some advice says 40 to 50 litres.  Ideas?
    • The thing with inhibitors is they deplete, a static system will locally deplete the inhibitor and you may get some corrosion.   Enable the pump any seize and it will run the pump a couple of minutes every week or so.
    • For general interest. When written risk assessments became a requirement, we put one together that was about 8 pages long, and attached to it a standard A4 form for each specific task. So there might only be one at the start of the job. HSE snap visits (maybe 10% of projects or one per year) asked to see it. They were able to read it in 5 minutes, and follow up with questions and a site tour. One inspector said he wished all manuals were like this, but that sadly it was changing.   What they most want to know. Who is in charge? Everyone on site should know. Then asks that person what is happening today, and show me the relevant paperwork. Then a look at the work in progress and site in general. Often they'd give good advice        When I retired, our file had expanded somewhat, as required,  but was kept relevant and job specific, and was generally one lever arch, half full. On a major national contractor's site I saw they had 3 very full, big files. I happened to be in their cabin, being a subcontractor, when HSE turned up.  The manager couldn't find the relevant bit. HSE not impressed. That file was designed to keep the hierarchy safe, not the site personnel. Mine he read and praised, looked at what we were doing and that was that.    The bulk of the paperwork that is just waffle was (and is) of no interest.   So do it. They don't expect a professional file for a self- build but would from any biggish contactor you are using. They have always been decent people in my experience.   The best bit of advice I can give for safety is to think "what could go wrong" and note the measures in place or sort it. Practically it is often  by not having too much going on at the same time.   If I could find one of my blank forms I'd depersonalise it and publish it here...but I can't. Maybe someone else can.   What you really, really don't want is HSE turning up to you after dealing with a nasty accident somewhere else and finding a shambles.  
    • Depends how it is worded and chatted.   If x-axis is accidents, and y-axis is volume of useful paperwork, then if my hunch is right, it should be a negative correlation. Swap the axis around, and it becomes positive (but still shows the same result). if, on the other hand, the paperwork is too voluminous, badly written and unorganised, them the correlation could be 0, or flat, but with a lot of variance between data points.  
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