Does anyone know whether oil, gas, metal pipe flanges need cross wiring? Function? On the basis of what?
4 and below flanges need to be bridged. In order to guide the static electricity.
Flange cross connection is required,Electrostatic accumulation produces electrostatic sparks, so electrostatic discharge is necessary to the ground. But often because the gasket flange connection without electricity, the bolt will rust, caused by the two conductive flange is not good, so it is necessary to use jumper assurance static drain.Electrostatic grounding is not to decide the number of the flange bolts, is based on the measured resistance value to decide, so the requirements of electrostatic grounding: TSG D0001-2009 "pressure pipe safety technology supervision regulation for industrial pipeline" eightieth pipe electrostatic grounding requirements, the resistance value should be measured joint resistance and pipeline system. When the resistance value is more than 20801 or GB/T provisions of the design documents, shall be set up across the wire (or screw connection between the flange and the grounding wire).GB/T20801.4 2006 "pressure piping - Part fourth: Specification for industrial piping fabrication and installation of" 10.12 electrostatic grounding 10.12.1 pipeline static earthing request, each section shall have good electrical conductivity. The resistance of each flange or threaded joints between the values greater than 0.03, should set up a wire jumper.10.12.2 pipeline system to ground resistance value more than 100 ohm, should be taken Measure or set two grounding wire. Grounding wire shall be welded with.10.12.3 static grounding requirements of stainless steel pipe and titanium pipe, wire jumper or grounding wire may not be directly welded with titanium pipe and stainless steel pipe, the pipe should be using the same material and ground transition.10.12.4 electrostatic grounding after installation that must be tested when the resistance value exceeds the requirement should be adjusted.Data comes from the web
