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A605, No.5 Bldg, BaiziYuan, Chaoyang, Beijing, 100124, China.

 
       
       
       
       
   

 

 

 

Insulating Joint


Insulating joint is a new generation developed product to resolve use problem of old insulating flange.


It is the essential pressure component necessary for steel pipeline catholic protection system, broadly applicable to steel pipeline catholic protection system.


Our company’s insulating joint adopts a unique design based on referencing foreign latest product structure to overcome problem of inadequate rigidity, prone to leak, unable to be buried under ground, short service life, etc.


The insulating connectors have realized buried parts maintenance-free function and allow a service life matching the pipeline.


 

 

Technical Characteristics


Dimension specification: DN15~DN1200
Pressure grade: PN1.0~PN40MPa
Service life: same as the service life of pipeline
Ambient temperature: -30℃~90℃
Applicable medium: oil, gas, water, chemical feed, mineral slurry

 

 

Quality Requirement


Insulating resistance value: ≥10MΩ@DC1000V
Maximum voltage: ≥3kv
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 *70 *65 *60 *56 *52 *46 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.


 

Type Specification A B L Steel pipe material
DN25-25 DN25 34 4 250  
DN25B-25 32 4 250
DN40-25 DN40 48 4 300
DN50-25 DN50 60 4 350
DN50B-25 57 4 350
DN65-25 DN65 76 5 350
DN80-25 DN80 89 5 400 Steel pipe 20 GB/T8163
DN100-25 DN100 114 5 400
DN100B-25 108 5 400  
DN125-25 DN125 140 6 500
DN125B-25 133 6 500
DN150-25 DN150 168 7 500
DN150B-25 159 7 500
DN200-25 DN200 219 7 500
DN250-25 DN250 273 8 800
DN300-25 DN300 325 8 800
DN350-25 DN350 356 8 900
DN350B-25 377 8 900
DN400-25 DN400 406 8 900 Steel pipe 16MnR GB6654
DN400B-25 426 8 900
DN450-25 DN450 457 8 900  
DN450B-25 480 8 900
DN500-25 DN500 508 10 900
DN500B-25 530 10 900
DN600-25 DN600 610 10 1000
DN600B-25 630 10 1000
DN700-25 DN700 711 10 1200
DN700B-25 720 10 1200
DN800-25 DN800 813 12 1300
DN800B-25 820 12 1300

 

 
Send mail to info@farAsia.com.cn with questions or comments.
Copyright © 2003 Far Asia Co., Ltd (China) 
Last modified: 11/20/14