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The principle and performance of insulating flange work

2014-12-25 16:35:14   Comment:0 Hits:
Removable flange connection is a connection. There are holes on the flange bolts, wear, the two flange, the flange gasket seal. According to the connected components can be divided into the vessel flange and pipe flange.
The working principle of insulated flange is used in insulation, insulating flange gasket and high strength insulating sleeve gasket electrical insulation flange on both sides of the electrical insulation of the insulation performance of the work. According to the engineering practice, we on the insulating flange insulation performance of insulating flange design according to "technical regulations" (SY/T0516--1997) in the relevant requirements and "parameter of cathode protection of buried steel pipeline test method" (SYJ23 - 86) of the test, the test results show that: the insulation gasket and a fastening bolt insulating sleeve gasket at the insulation resistance value between the working surface can meet the standard requirements.
Insulating flange in the valve at the building of the cathodic protection of the distribution network and the need for potential slice (area) the isolation of the buried pipe valve wells. Divided buried transmission and distribution pipe network (District) isolation can more clearly grasp each piece (District) cathodic protection network; on the cathodic protection patch (District) were evaluated, aiming at the cathodic protection situation of different treatment; when the adjacent slices (area) the protection potential and achieve the same (or similar) the protection potential requirements, cross bar will be available on both sides of insulating flange connected unified protection; when the adjacent slices (area) the protection potential difference is larger and there is not up to the requirements of the sheet protection potential (area), but will not reach the protection potential requirements of the sheet (District) for special treatment until it meets the requirement after the operation, lace.
The effective insulation protection scope of flange leakage will reduce cathodic protection station, increasing the output current of the cathodic protection station, leakage of flange are put forward, current direction method, pipeline current method and grounding resistance method judging method. Discusses the hazard of electric leakage, the leakage reason is analyzed, and puts forward some corresponding measures to eliminate electric leakage. The effective insulation protection scope of flange leakage will reduce cathodic protection station, increasing the output current cathodic protection station. By using pipeline sacrificial anode protection, mostly because of insulating flange leakage is not up to the requirements of the pipe / ground potential. With integrate insulation adapter to replace insulated flange, flange insulation flange and short circuit applied in overburden layer, or the insulating flange installed in a vertical pipe, can increase the insulation insulation flange.
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