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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 |
|
