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Quick Details

  • Material: Carbon Steel
  • Technics: Forged
  • Type: Coupling
  • Place of Origin: Shanghai, China (Mainland)
  • Model Number: 1"-60"
  • Brand Name: Changhao
  • Connection: Welding
  • Shape: Equal
  • Head Code: round
  • Pressure class: PN25 PN40 PN64 PN100
  • Ambient temperature: -20 +60℃
  • Insulation resistance: 20MΩ
  • Maximum voltage: 2.5kv
  • Working temperature: -10 +75℃

Packaging & Delivery

Packaging Details wooden case
Delivery Time 5--35days

Mechanical properties:

1)the excellent mechanical properties are achieved by a rigid design of statically favourable form, using thermo-setting plastics free from  cold flow as insulating materials.

2) the welded unit provides a safe and reliable connection even over extremely long period of operation without the risk of the secured and locked unit loosening or separating.

3) countless tests, prototype tests and empirical data gained during the course of many years of practical operation confirm the soundness and correctness of the complete welded design


Electrical properties:

1) the dimensioning and practical arrangement of the insulating  sections within the overall design in addition to technical production  factors, in conjunction with insulation materials of a suitable quality,  result in the ideal overall electrical behaviour of the insulating joints

2)large external insulating length, thus eliminating the possibility of


3) very good dielectric strength, substantially greater than is the case  with conventional insulating flanges

4)the average electrical resistance, measured at 1000 VDC, exceeds 40 Mohm

 5) a decisive factor in safe operating behaviour, however, is linerarity between the voltage applied and the resistive leakage current



1) pipes, e.g. in accordance with DIN, API, ASTM-A and other standards

2) seamless rings made of plate material or of forged quality,  depending upon requirements and design calculations

3) seals of aging-resistant material, e.g. buna N, viton, EPDM and  other materials.

4) insulating materials made of tried and tested materials with  application-specific properties


External coating

1) unless otherwise specified, we apply PUR (Polyurethane) acc. to  DIN 30671 as a standard

2) other types of coating are possible according to agreement and  purpose



bitumen primer, coal tar epoxy resin and others


Internal lining:

1) as per standard without lining

2) virtually all types of lining can be applied upon agreement,  depending upon intended purpose

3)electrically conductive media and deposits require an appropriate

internal lining


Quality Requirement

Insulating resistance: ≥10MΩ@DC1000V
Maximum voltage: ≥3.5kv
Insulating intensity: no breakdown or one minute @2500v 50HZ
Hydraulic pressure testing pressure: 1.5times of designed pressure
Air-tight testing pressure: equivalent to designed pressure
Non-destructive testing: all the butt-connectors are 100% ray-detected according to JB4730-94; other pressure welding seams are 100% magnetic power detected
Groove: adopt API 5L standard




Material Requirement

This product adopt’s material satisfy below request:

Insulating material: high strength epoxy resin and fiberglass stratification composite material
Bends intensity: lengthways ≥390 MPa Side direction ≥290 MPa
Pulls stretch intensity: lengthways ≥340 MPa Side direction ≥240 MPa
Compressive intensity: ≥390 MPa water –absorbing ≤30mg
Soaks in water behind resistance: ≥5*108Ω Breakdown resistance ≥35kv
Assemblies steel: 16Mn JB4726; ASTM A694 F52, F60
Short pipe: 20# 16Mn GB8163-99 X70 X65 X60 X56 X52 X46 API SPEC. 5L
Sealing material: O shape or U shape gland ring: Rubber fluorine, Jing base-butadiene rubber, According ASTM D2000
Lining material: Cold solid colophony
Insulating paint: imports liquid epoxy resin
Anti-corrosion insulating material: two-component solvent-free epoxy coating, anti-corrosion thermal contraction busing

Type and Dimension

For example: DN400B-64 represents the insulating joint of DN400 and 6.4Mpa press class.

Insulating joint  / insulated coupling

Dimension specification: 1"~60"

Pressure grade: class150~2500
Service life: same as the service life of pipeline
Ambient temperature: -30°c~90°c
Applicable medium: oil, gas, water, chemical feed, mineral slurry


Insulated joint coupling / insulation joint coupling / insulating joint coupling / dielectric joint coupling



 Insulated joint coupling / insulation joint coupling / insulating joint coupling / dielectric joint coupling



 Insulated joint coupling / insulation joint coupling / insulating joint coupling / dielectric joint coupling  



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