E-mail: info@pipesl.com

Insulation Flange

The insulating joint (Isolating Joint) is the key component in Cathodic Protection (CP) System. Available sizes from 1” to 120”. The standard test for insulation flange. Insulation Flange is a general term for pipe flange joints which have both the sealing performance required by buried steel pipe and the electrical insulation performance required by electrochemical corrosion protection engineering. The utility model comprises a pair of steel flanges, an insulating seal between the two flanges, a flange fastener, an insulating part of the fastener and a pair of steel short pipe welded separately with the two flanges.
Product Details

Specifications of  Insulation Flange

Monolithic Insulating joint
Size: 1''-120'',

CL150, CL200, CL300, CL400, CL600, CL900, CL1500, CL2500
Standard: GB150-2011 or ASME B 31.8 or ASME B 31.4/31.3

Installation place: Aboveground or underground

Business Type: Manufacturer

Materials characteristics of  Insulation Flange


The insulating joint (Isolating Joint) is the key component in Cathodic Protection (CP) System. It is mainly used in underground gas transition and distribution system including gas reducing station, each section of the gas transition and distribution pipeline, also the part between gas reducing station and the pipeline, which increase the life of the plant and equipment by reducing or eliminating the electric and chemical corrosion damage.


Ø Suitable for oil, city gas, natural gas, LNG, LPG, etc.

Ø Size:  1” to 120”

Ø Matching pipeline: API 5L Gr. B, X42, X52, X60, X65, X70, etc.

Ø Pressure rating:  ANSI Class 150, Class 300, Class600, Class 900, Class1500, Class2500

Ø Ambient Temperature: -30°C-90°C

Ø Working Temperature: --20°C-120°C

Ø Assembled parts: According to ASTM A694 F52/JB4726:16Mn Ⅱ(pressure grade<6.4MPa)

Ø Short tube: equivalent to that of pipeline

Ø Insulating material: ASTM D709 G11 or GB1301.1-1998 high-strength epoxy glass cloth laminated material

Ø Filling material: high-strength epoxy resin

Ø Sealing material: rubber fluoride

Ø Sealing stickiness: silicon rubber

Ø Surface anti-corrosion insulating material: two-component solvent-free epoxy coating, anti-corrosion thermal contraction bushing

Standard Testing of  Insulation Flange

*  Hydrostatic test: 1.5 times MOP (Max. Operation Pressure).

*  Electrical Resistance:  >= 20Mohm @ 1000v DC under dry air at 25 oC

*  Dielectric voltage:  >= 3.5kv AC 50Hz (1 minute) (Can be 5kv as per request)

Ordering Information:

Please specify the following requirement:

*  Pipeline Diameter, Grade of pipe, the wall thickness of pipe;

*  ANSI rating

*  Medium to be transported in pipeline and temperature of transported medium

*  Additional Testing required except standard testing: X-ray, ultrasonic & magnetic testing, etc.

Service life of insulation flange joint: same as that of the pipeline; Applicable media: oil, gas, water, chemical raw materials, pulp applicable.

Quality requirements for insulation flange joints

Insulation strength: 2500V 50Hz 1 minute no breakdown or arc; Insulation resistance value: DC 1000V resistance value ≥6MΩ; Hydraulic test pressure: 1.5 times the design pressure; Airtight test pressure: equal to the design pressure; Non-destructive testing: According to JB4730-94, all butt joints are tested by 100% ray, and other pressure welds are tested by 100% magnetic particle. Groove: adopt API5L standard.

Insulation Flange

Online Message
Related Products
Our Service

Factory prefabrication of processing pipelines

2023-12-18 15:37:29
Factory prefabrication of processing pipelinesProcess pipeline is used to transmit medium, which is connected with all the equipment in the device, and through various control components to adjust the

Customized Design and special-shaped pipe fittings processing

2023-12-18 15:37:30
Offering customized drawing design and confirmation services for special-shaped pipes, fittings, valves, etc. From design, and drawing confirmation, to the final product.We Cangzhou Shenlong Pipe Manu

Final Inspection

2023-12-18 15:37:33
Firstly,  the professional QC do the tests and inspection as per customers’ requirement or standardsItems:Visual Inspectionsa. Inspect and take measurements of the thickness of the pipes and ensure th

Packing and marking

2023-12-18 15:37:34
One-stop packing and transportation services can be offered. We can provide packing solutions as per clients’ demands. such as the bulk cargo whole cabinet plan, reinforcement protection, taking pictu

Steel Pipe Coating

2023-12-18 15:37:35
To make steel pipes with an anti-corrosion effect refers to measures to slow down or prevent corrosion and deterioration of pipes under the chemical or electrochemical action of the internal and exter


2023-12-18 15:37:36
Galvanized is one surface treatment that makes the surface of the metal, alloy, or other materials coated with a layer of zinc. In this way, the steel pipes can be more attractive, as well as a rust p


2023-12-18 15:37:40
Steel pipes and fittings service projects include oil and gas pipeline companies, as well as utilities. Our services are not limited to pipelines, terminals, refineries, and processing facilities. as

Pipe Threading

2023-12-18 15:37:42
Threaded pipes have an effective seal when transporting liquids, gases, steam, and hydraulic fluid. We are also to thread any length of pipe in diameters ranging from 1/8” to 20”. Tapers available are

Roll Grooving

2023-12-18 15:37:43
Cangzhou shenlong pipe manufacturer co.,ltd. can provide both cut grooving and roll grooving. Cut and roll grooving can be done in any style according to industry standards. Cut grooving involves mach

Steel Pipe Beveling

2023-12-18 15:37:44
Beveling is the process in which we form an angle between the edge of a pipe and a plane perpendicular to the surface to a certain degree, most commonly used to prepare the ends of pipes for welding.


2023-12-18 15:37:45
We can provide customized cutting to size pipes for natural gas so that the pipes can be easier applied to your project. If you are buying sheets, tubes, plates, or shapes at the required length, plea

Steel Pipe Storage

2023-12-18 15:37:37
After steel pipes are produced as ordered, our experienced yard staff and our warehousing department will arrange cargo handling, storage, and storing of steel products in our facilities temporarily a
 Privacy settings
Consent to Cookies & Data processing
On this website we use cookies and similar functions to process end device information and personal data. The processing is used for purposes such as to integrate content, external services and elements from third parties, statistical analysis/measurement, personalized advertising and the integration of social media. This consent is voluntary, not required for the use of our website and can be revoked at any time using the icon on the bottom left.