A monolithic isolation joint is a general term for pipe joints that simultaneously possess the sealing performance, strength performance, and insulation performance required for buried steel pipelines under electrical corrosion conditions. It includes components such as assemblies, insulating plates, packing, sealing rings, and short pipes.
monolithic isolation joint size
| Type | Specification | A | B | L | Steel pipe material |
| DN25-25 | DN25 | 34 | 4 | 250 | Steel Pipe 20 GB/T8163 |
| 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 | |
| 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 |
Monolithic Isolation Joint Material Characteristics:
Excellent Insulation Performance: Insulation resistance ≥200MΩ (2500V megohmmeter test), breakdown voltage ≥3KV.
Long Lifespan: Same lifespan and strength as the pipeline.
High Strength: Pressure test ≥1.5PN (design pressure).
Operating Temperature: -30℃ to +90℃.
Applicable Media: Oil, gas, water, chemical raw materials, coal slurry, etc.
Insulation Material: High-strength epoxy resin and glass fiber laminated composite material: ASTM D709 G11. Flexural strength: Longitudinal ≥390MPa, Transverse ≥290MPa;
Tensile strength: Longitudinal ≥340MPa, Transverse ≥240MPa;
Compressive strength: ≥340MPa;
Water absorption: ≤30mg;
Water resistance after immersion ≥5*10⁸Ω;
Breakdown voltage ≥35KV
Combined steel body: 16Mn, JB4726, ASTM A694 F52, F60
Short pipe: 20#, 16Mn, GB8163-99;
X70, X65, X56, X52, X46, API SPEC.5L.
Sealing material: O-ring or U-ring: Fluororubber, acrylonitrile butadiene rubber, conforming to ASTM D2000.
Filling material: Cold-setting resin;
Insulating coating: Liquid epoxy resin;
Corrosion protection material: Heat-shrinkable corrosion protection material;
GNEE monolithic isolation joint for sale
