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Bonding of pipe sections and bond/ground testing Frequency

Bonding of pipe sections and bond/ground testing Frequency

Bonding of pipe sections and bond/ground testing Frequency

(OP)
Two Questions in one post:

1) Is there any regulation/code/standard on the need for star washers (to make a 'better' bond) between two pipe flanges....in pipe carrying liquid hydrocarbons (monomers, in particular)? I always thought that the flange bolts themselves were good enough to bond the pipe together (even if painted) with the added benefit of the pipe usually bonded/grounded to the structure anyway.

2) Is there a required testing frequency to verify the bond is still good? How about a testing frequency for earth grounds in general?

______________________________________________________________________________
This is normally the space where people post something insightful.

RE: Bonding of pipe sections and bond/ground testing Frequency

According to NEC art.250.8 "Connection of Grounding and Bonding" equipment pressure connectors has to be listed as grounding and bonding equipment. See [for instance]:
http://www.erico.com/public/library/fep/LT0359.pdf

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