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Quick Details

  • Place of Origin: Liaoning, China (Mainland)
  • Brand Name: YY
  • Model Number: JT
  • PN: 1.0~42.0Mpa
  • DN: 15-1500mm

Packaging & Delivery

Packaging Details Have a protective effect and meet the export requirements.
Delivery Time We will try our best to meet the requirement of our clients.


The Pipeline Insulating Joint (PIJ) is a high-resistance fitting used to electrically isolate sections of a pipeline to improve

YY-JT Series Insulating Joints


The Pipeline Insulating Joint (PIJ) is a high-resistance fitting used to electrically isolate sections of a pipeline to improve the effectiveness of cathodic protection systems and to reduce ground-loop currents. The PIJ is provided with extension nipples that match the pipeline wall and grade and are long enough to eliminate any possibility of thermal damage to the PIJ during field welding. It overcomes the problems of flange and flange kits with small rigidity, easily leak, unable to be buried under ground, short service life, etc. The insulating joints have realized the function of maintenance-free after buried under ground.


The monolithic design of the PIJ results in a pipe fitting having high cyclic bending strength integrity. The integrity of the PIJ is further enhanced by using rubber fluoride seals and insulation of high-pressure, glass-filled, structural epoxy laminate. The monolithic profile will not trap moisture and reduces the possibility of crevice corrosion. This is an additional advantage of the monolithic design over conventional insulating flanges.


Design Specifications
Pipe Insulating Joints are designed in accordance with ASME Pressure Vessel Code, Section VIII, Division 1, unless another recognized code is specified. Each PIJ is designed to be at least as strong as a comparably rated pipeline when subjected to external loads.

Technical parameters:

Size:DN15 to DN1500

Pressure range: PN1.0 to PN42 Maps

Service life: same as the service life of pipeline

Applicable medium: oil, gas, water, chemical raw material, ore pulp


Quality requirement:

Insulating resistance≥6 MΩ at DC 1000V

Insulating intensity: no breakdown or puckering arc for one minute at 2500V 50Hz

Hydraulic test pressure: 1.5 times of designed pressure

Air-tight testing pressure: equivalent to designed pressure

Non-destructive testing: All the butt-welding ends are 100% X ray-detected, other pressure welding seams are 100% magnetic power detected

Bevel end: according to ASME B16.25


Materials characteristics:

Assemblies: forging piece

Extension nipples: equivalent to that of pipeline

Insulating material: high-pressure, glass-filled, structural epoxy laminate

Filling material: high strength epoxy resin

Sealing material: rubber fluoride 26

Anti-corrosion insulating material: Two component solvent free epoxy coatings, anti-corrosion heat shrink sleeve


Test items:

Hydrostatic testing : 1.5 times of design pressure

Voltage testing : AC 3000V

Insulating resistance: DC 1000V

Visual inspection

Dimensional inspection

Hydraulic Test and Bending test

Hydraulic cycling (fatigue) testing

Dielectric strength test Immersed in electrolyte solution

Coating adhesion test


Ordering Information

Please provide the following information on any purchase order or request for quotation:

  1. Nominal pipe size 
  2. Pipe wall thickness
  3. Pipe grade
  4. Design rating or pipeline pressure
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