Where are metal flanges usually used?
Two 、 DB 42512-2008 flammable and explosive places lightning protection device and anti-static grounding device testing technical specifications6.2.2.2 oil and gas pipeline system6.2.2.2.1 inspection of long distance no branch pipeline and pipeline, in the process area (including production workshop, plant, storage tank, etc.), bifurcation should be set as required, grounding, testing its grounding resistance6.2.2.2.2 check the pipeline within the building 100m, should be ground once every 25m, test its grounding resistance6.2.2.2.3 check the parallel pipe spacing is less than 100mm, every 20 to 30m for electrical connection, when the pipe crossing and the net distance is less than 100mm, should be electrical connection, test its electrical connectionCheck the flange should be cross pipe connection, in the non corrosive environment of not less than 5 bolts can not cross the transition resistance testing flange bridging material specifications.
Electrostatic connecting line should be in accordance with the standards in Appendix H (informative) as shown in table H.1.Three. Specifications for design and construction of GB 50156-2002 gas station10.3.3 in * * hazardous areas of oil, liquefied petroleum gas and natural gas pipeline flange, hose ends the joint application of metal wire jumper. When the bolted flange connection not less than 5, in the non corrosive environment can be bridged.
1, less than five screws, there should be cross wiring2: flammable and explosive place is to prevent power leakage and electrostatic spark using conductive metal will better connect the two flange reliable, pipeline grounding, flange generally corrosion caused by poor contact is easy to produce sparks, in order to prevent the accident of flange jumper3, according to:I. code for design of GB50074-2002 oil depots14.2.14 in the dangerous area of the pipeline (oil and gas), the following lightning protection measures shall be taken:1 the flange connections of the oil pipeline shall be bridged and shall not be bridged in a non corrosive environment when not less than 5 bolts are connected2 the metal pipe that is parallel to the ground or the groove of the pipe, when the net distance is less than 100mm, the span of the metal line should be not more than 30m., and the intersection distance of the pipe crossing is less than 100mm, and the intersection shall be connected with metal wire
