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Bonding District heating Pipework,

Toby Knox

Hi

Everyone's favourite topic Earthing and bonding, Some background information, We have insulated metallic pipes going under ground to several blocks of flats. Each block has an intake room where the pipe work enters from the ground to the energy centre 1 kilometre away. Each block is at a different stage of construction with some being occupied. After spending some time on site I am yet to see any bonding in place for any pipework. I'm aware of the test for extraneous-conductive-part but due to these being occupied the pipework has meters, probes ect which creates parallel paths and the buildings in early construction phase only have temporary power with no reliable MET to test with. 

So many question how can I determine if the existing pipe work requires bonding and how can I test the new pipework with no reliable earth?

Attached is an photo of the intake room pipe work in the early stage of Construction.

Thank-you for any help on the matter.

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    Or another thought on testing - with a long lead could you do a continuity test between the pipes in two different places (e.g. next door buildings)? That might actually be a better test anyway, since the thermal insulation may electrically insulate the pipes from Earth, but wouldn't prevent potentials being transferred from one installation to another along the pipes (if they are metallic).

       - Andy.

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    Or another thought on testing - with a long lead could you do a continuity test between the pipes in two different places (e.g. next door buildings)? That might actually be a better test anyway, since the thermal insulation may electrically insulate the pipes from Earth, but wouldn't prevent potentials being transferred from one installation to another along the pipes (if they are metallic).

       - Andy.

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