Discuss a standard issue regarding electrostatic bonding
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These days, many devices come equipped with built-in static discharge connections; a connection is made between two connected flanges. The connector for this connection consists of bolt holes, and the wire used is insulated; its ends are soldered together, giving it a very attractive appearance. However, when factories create such connections on their own, they use simply copper strips, or at best cables. Moreover, in many cases, a connection is made only after passing by a valve or after several flanges. May I ask: Are standard jumper wires available? We’ve made purchases several times yet still couldn’t get it; it’s strange! Is it acceptable to use multiple flanges spaced apart for bridging? Is it feasible from a practical standpoint?
There should be no gaps between flanges when making connections; every flange must be connected. For those with more than six bolts, no further connections are needed. We have two types of jumpers: one is used during installation – it’s made of copper wire； Another option is to install it oneself after modification, using the purchased connectors (copper sheets) connected with copper wires.
Well, it’s actually quite easy to do. I checked Taobao and found someone selling it for 2 yuan each, which I think is a great deal!
1# For Rainbow Environmental Protection static bypass wires, there should be no gap caused by flanges; if there are six screws or more, it is not necessary to use a bypass wire. **There is a standard: ‘General Technical Specifications for Preventing Static Electricity’**
4# tujing998 Six screws? **Is there a standard called \"General Technical Specifications for Preventing Static Electricity\"?
What is mentioned on the 4th floor must be the \"General Guidelines for Preventing Static Electricity Accidents\". You can learn about anti-static bonding by referring to this standard.
I’m hearing about the 6 screws for the first time! I would still like to ask the folks upstairs to take a look at the \"HG-T 20675-1990 Code for Design of Static Grounding in Chemical Enterprises\" and the \"SH3097-2000 Standards for Design of Static Grounding in Petrochemical Industries\".
It should be that five or more bolts do not require bridging, but I simply can’t find the exact wording anywhere. Can someone tell me where it is? Also, the so-called five bolts are conditional as well; the condition is that a bridging connection is required...
It’s not the case that a bypass connection is required if there are five or more bolts; rather, a bypass connection is unnecessary when the resistance between the two flanges with five or more bolts is less than 0.003 ohms.
8# fallautumn Article 5.1 of the 《Static Electricity Safety Inspection Regulations for Chemical Enterprises» stipulates that: when metal equipment is connected to other metal equipment, or pipes are connected to each other using metal flanges, it is not necessary to use additional bonding wires. But there must be more than two bolts for connection. ” SH3097－2000 \"Code for Design of Static Grounding in Petrochemical Industries\" 4.3.3 When metal flanges are fastened with metal bolts or clamps, it is generally not necessary to install additional static connection wires; however, it must be ensured that there is good electrical contact between at least two bolts or clamps. Code for Lightning Protection of Oil and Petroleum Facilities 4.6.1: Oil pipelines can be used as their own lightning conductors, and metal bonding wires should be installed at the connections of their flanges and valves. When the flange is connected using 5 or more bolts, it is not necessary to use a metal wire for bridging, but an electrical path must still be established. Clause 10.3.3 of the \"Code for Design and Construction of Automobile Fueling and Gas Refueling Stations\" GB 50156--2002 (2006 edition) specifies that bridging is required when there are no more than 5 bolts.
I used to be confused about the reason why five bolts do not require an electrostatic bypass. I finally understand it now!