In what situations is an anti-static bonding strap for flanges not required? ?
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During the on-site inspection yesterday, the experienced technician pointed to the anti-static bonding wire on the flange of a compressed air pipeline and asked me whether this anti-static bonding wire was necessary I was completely confused in an instant – the connection was already established, so why wasn’t it needed? The experienced master said: It’s not needed here. Do you know why? What I’m wondering is: is it because there’s air inside the tube? The experienced worker said: This flange has 8 bolts, and no more than 4 of them need to be used. Huh? Is this statement still around? Dear sea friends, please discuss actively which standard contains such a statement Also, are there any other situations where it is not necessary to install anti-static bonding wires?
Clause 10.12.1 of the \"Code for Pressure Piping – Industrial Piping, Part 4: Fabrication and Installation\" (GB/T20801.4-2006) stipulates that for piping requiring static grounding, good electrical conductivity must exist between various sections of such piping. When the resistance value between each pair of flanges or threaded joints is greater than 0.03Ω, a wire bridge should be provided. In addition, Article 7.13.1 of the \"Code for Construction of Industrial Metal Piping Projects\" (GB 50235—2010) stipulates that for pipelines for which static electricity grounding is required, a bonding wire shall be installed when the resistance value between each pair of flanges or other joints exceeds 0.03 ohms. It can be seen from this that to determine whether industrial pipeline metal flanges need to be bridged, it is necessary to measure the resistance value between the flanges. When the resistance between the flanges exceeds 0.03Ω, a wire bridge should be installed.
Knowledge is useful: handshake
In practice, is it determined whether a jumper is needed by testing the resistance of each flange? ? Is the statement made by the experienced technician above, that flanges with more than 4 bolts do not require cross-connections, based on experience?
This post was last edited by Little Chemical Engineer on 2019-3-15 at 13:31. It states that this requirement can be found in section 4.7.1 of GB 15599-2009, the Safety Code for Lightning Protection in Petroleum and Petroleum Facilities. For metal flanges with no fewer than root bolt connections, in a non-corrosive environment, it is not necessary to make a bridge connection, but an electrical path must be established. May I ask, what does it mean to form an electrical circuit? In the case of a bolted connection, it definitely forms an electrical path
In the case of bolt connections, an electrical path is generally established, but it may not be established if the bolts are severely corroded or similar.
More than four and not less than five mean the same thing; is four more than four? Obviously not.