Grounding above ground piperack
Grounding above ground piperack
(OP)
I am working on a new facility that will have piping connected to an existing facility. The piping runs above ground and is installed in a piperack. The two facilities have independant power systems. There is no cathodic protection on the piping and the piping does not run parallel to a high voltage transmission line. Normally I always ground the pipe rack, but I've always worked in a single facility. Is there a requirement to isolate the grounds between the two facilities? Why would I want to isolate or connect the grounding grids of the two facilities through the piperack?






RE: Grounding above ground piperack
"Transferred potentials may be reduced or stopped at the substation
boundary by inserting insulating sections of sufficient length to avoid shunting by the adjacent soil. The insulating sections must be capable of withstanding the potential difference between remote earth and the substation."