Insulation Connector

 The insulating joint is the essential pressure component necessary for steel pipeline cathodic protection system, broadly applicable to steel pipeline cathodic protection systems, adopts a unique design based on referencing foreign latest product structure  to overcome problems of inadequate rigidity, prone to leak, unable to be buried under ground short service life, ete. The insulating joints have realized buried parts maintenance-free function and allow a service life matching the pipelines.

Design specifications：

BPV  Code Sect Ⅷ Div.ⅠAppendix2  GB150

Design code：ASME B31.3  GB50253

Technical characteristic：

 Dimensions ：DN15～DN1200

 Pressure grade：PN1.6～PN40.0MPa

 Service life：same as the service life of pipeline

 Applicable medium：oil, gas, water, chemical feed ,mineral slurry

 End slope meatus：in accordance with  ASME B31.4 and the regulations for welding technics

 Installation place：buried-levelly under the earth

Quality inspection:  

100% insulating resistance value test： ≥10MΩ@DC1000V

100% insulating intensity test：no breakdown or arc for one minute @5000V 50Hz 

100% hydraulic pressure testing pressure: 1.5 times of designed  pressure

100% air-tight testing pressure：equivalent to designed pressure

100% non-destructive testing：to 100% the crack detection of the weld line of all the butt-connectors by ray accordance with ASME  BPV Code Ⅷ UW-51，App.12，App.6 or JB4730, other welding line  are 100% detected by ray or magnetic power.

100% surface of end slope examination

100% hardness test on weld joints

5% submerging electrolysis fluid insulating intensity testing：≥6MΩ

5% hydrostatic pressure plus bending test ：longitudinal stress 72%×the regulated test bending intensity.

5% hydrostatic pressure fatigue test：1MPa～85% hydrostatic  pressure test for 40 cycles

100% the thickness of coated dry velum test

100% visual and dimensional check

 5% coat adhering test

Material s characteristics：

Assembled parts：according to ASTM A694 F52/JB4726

Stub end：same with pipeline material

Insulating material：ASTM D709 G11 or GB1301.1-1998 high strength epoxy glass

Filling material：high strength epoxy resin

Sealing material：rubber fluoride 26

Sealing stickiness：silicon rubber

Internal & external surface anti-corrosion insulating material：two- component solvent-free epoxy coating, anti-corrosion thermal contraction bushing. 

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