tvrulesme Posted October 17, 2021 Share Posted October 17, 2021 Planning a very minor trench excavation to bring in a new gas supply and water main. I've got the safe dig plan from my gas network SGN and looks fine for where I want to dig but just curious what some of the symbols which are not included in their key mean. Assuming 250 PE means a 250mm Polyethylene pipe? So what are 8" SI, 125 FF etc? What about the speech bubble "650943840"? Their key: Link to comment Share on other sites More sharing options...
Dave Jones Posted October 17, 2021 Share Posted October 17, 2021 be aware those plans are +/- 100m! Cant trust them at all, if you are hand digging it wont be a problem if you are using a digger get someone who has done it before. 1 Link to comment Share on other sites More sharing options...
Mr Punter Posted October 17, 2021 Share Posted October 17, 2021 Most of the gas main is iron or polyethylene. I think the FF is PF which could be pitch fibre but I didn't know that was used for gas. SI and CI I guess iron. ST for steel? Maybe an experienced excavator operator could comment as they will have hit all of them over time. Speech bubble looks like it is pointing to a valve. 1 Link to comment Share on other sites More sharing options...
tvrulesme Posted October 17, 2021 Author Share Posted October 17, 2021 2 hours ago, Dave Jones said: be aware those plans are +/- 100m! Cant trust them at all, if you are hand digging it wont be a problem if you are using a digger get someone who has done it before. Thanks. Yes it's a tight little spot so you'd not be able to get a digger in there. 1m2 down to 900mm Link to comment Share on other sites More sharing options...
Declan52 Posted October 17, 2021 Share Posted October 17, 2021 The 180 PE in 8in SI means they have a used an old cast iron pipe system to run the PE (polythene) gas pipe through. Link to comment Share on other sites More sharing options...
Makeitstop Posted October 17, 2021 Share Posted October 17, 2021 3 hours ago, Dave Jones said: be aware those plans are +/- 100m! Cant trust them at all, if you are hand digging it wont be a problem if you are using a digger get someone who has done it before. How do you know the plan is +/- 100m? Link to comment Share on other sites More sharing options...
Conor Posted October 17, 2021 Share Posted October 17, 2021 (edited) SI is spun iron. The number on the label is a valve reference. FF is PE but they've the label below the other layers so it's obscured. Edited October 17, 2021 by Conor Link to comment Share on other sites More sharing options...
Dave Jones Posted October 18, 2021 Share Posted October 18, 2021 11 hours ago, Makeitstop said: How do you know the plan is +/- 100m? was a little tongue in cheek, they just never are 'that' accurate. ok for modern stuff but where they have transcribed from old paper plans can be literally miles out or not show anything at all when you know its there. Link to comment Share on other sites More sharing options...
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