MONOLITHIC ISOLATION JOINTS | FLANGE PIPE CONNECTION

GPT engineers and manufactures a range of high quality sealing and isolating products used to ensure the safe flow of fluids in transmission, distribution and process piping systems. Flange isolation products include a wide selection of isolation joints and spools that are available in all pipe sizes, types, pressure ratings, and materials.

  • ABOUT
  • FEATURES AND BENEFITS
  • SPECIFICATIONS
  • ADDITIONAL INFORMATION
Factory assembled, permanent and maintenance-free weld-in electrical isolation joint. Replaces flanged connections.

The ElectroStop® monolithic isolation joints are a leak-proof, maintenance-free and long lasting block against the flow of electric current in all piping systems. The ElectroStop® eliminates short circuits and field assembly. The ElectroStop® is coated internally and externally to prevent corrosion and is 100% hydrostatically, electrically and weld tested. All ElectroStop® monolithic isolation joints are manufactured under an ISO Quality Management System.

    • Eliminates short circuits
    • Eliminated field assembly
    • Eliminates maintenance
    • Is less expensive than competitive products
    • Is coated both internally and externally
    • Is 100% electrically tested
    • Is completely weld inspected
    • Is manufactured under an ISO Quality Management System
    • 100% butt weld construction

    Sizes

    • Available for NPS 10 - 48
    • Available up to ANSI 900# Class
  • 150# ANSI CLASS (PN OR DP 25)

    • 150# ANSI Pressure Rating = 285 psi
    • ElectroStop® Continuous Operating Pressure = 300 psi
    • Test Pressure = 450 psi
    • Working Temperature: Range = -20 °F to 212 °F (-28 °C to 100 °C)
    • Electrical Resistance (Dry Air) = 25 Mohms @ 1kv D.C.
    • Breakdown Voltage (Dry Air) = 5kv @ 60Hz for 1 minute

    300-400# ANSI CLASS (PN OR DP 64)

    • 300# ANSI Pressure Rating = 740 psi
    • 400# ANSI Pressure Rating = 990 psi
    • ElectroStop® Continuous Operating Pressure = 1000 psi
    • Test Pressure = 1,500 psi
    • Working Temperature: Range = -20 °F to 212 °F (-28 °C to 100 °C)
    • Electrical Resistance (Dry Air) = 25 Mohms @ 1kv D.C.
    • Breakdown Voltage (Dry Air) = 5kv @ 60Hz for 1 minute

    600# ANSI CLASS (PN OR DP 100)

    • 600# ANSI Pressure Rating = 1,480 psi
    • ElectroStop® Continuous Operating Pressure = 1,500 psi
    • Test Pressure = 2,225 psi
    • Working Temperature Range = -20 °F to 212 °F (-28 °C to 100 °C)
    • Electrical Resistance (Dry Air) = 25 Mohms @ 1kv D.C.
    • Breakdown Voltage (Dry Air) = 5kv @ 60Hz for 1 minute

    Monolithic isolation joints shall be bolt less and completely factory assembled in accordance with the appropriate requirements of ASTM, API, DIN and BS codes. All welds shall be butt weld construction. The dielectric isolation material shall be a high temp thermosetting fiberglass epoxy material. Sealing shall be by dual static, self energized “O” ring seals housed in accurately machined grooves, fully protected from cavitation in full compliance with ASME design codes.  Each unit shall be tested for Electrical (@5kv, 25 Mohm), Hydrostatic (@ 1.5 x O.P.) and Weld (Ultrasonic/Magnetic Particle). The Monolithic Isolation Joint shall be the Electro-Stop® Isolation Joint as manufactured by GPT.

    Note: All data supplied is for standard joints. Please contact factory for nominal diameters, pressures (up to 2500 ANSI), temperatures (up to 320 °F / 160 °C) and electrical characteristics not shown. The information is subject to change at the manufacturer's discretion.

  • Eliminates Short Circuits

    Bolts, sleeves and washers — the major source of short circuits in most isolation assemblies — are eliminated with the ElectroStop® monolithic isolation joint. Each joint is electrically tested during production to assure integrity, performance and isolating properties.

    Eliminates Field Assembly

    The ElectroStop® isolation joint is completely factory assembled and tested. There are no flanges, gaskets, nuts, bolts, sleeves or washers to handle and consequently no fluid leaks due to improper field assembly.

    Coated Both Internally and Externally

    A two-part bonded epoxy is sprayed to within 2” (50.8mm) of each weld end. Each joint is tested for coating thickness uniformity and for coating holidays.

    100% Hydrostatically Tested

    All ElectroStop® joints undergo hydrostatic pressure tests at 1.5 times their rated operating pressure in accordance with ASME B31.3 standards. Testing is normally conducted for 30 minutes on joints up to 6” and for 60 minutes on 8” to 24” joints, but can be longer upon customer request. A pneumatic test is held at 87 psi for 10 minutes.

    Completely Weld Inspected

    All ElectroStop® joints undergo a weld inspection with a combination of phased array ultrasonic testing (PAUT), visual testing (VT), and magnetic particle testing (MT) on all welds. In addition, radiography testing (RT) can be conducted upon request. All ElectroStop® joints are manufactured under an ISO 9001;2015 Quality Management System.

  • ABOUT
  • FEATURES AND BENEFITS
  • AVAILABILITY
The ElectroFlange™ is a pre-fabricated flange isolation kit including the flanges, bolts and pipe pups

ElectroFlange™ Joints provide electrical isolation for gas, water and petroleum pipelines; providing operation and maintenance cost savings. They do not require maintenance and can eliminate vault expense. GPT offers the best solutions for preventing corrosion in all industries including: onshore and offshore mains, petroleum refinery complex, chemical plants, waterworks, wastewater, gas transmission and gas distribution systems.

The ElectroFlange™ is factory assembled by GPT under controlled conditions and is 100% factory-tested and warranted to meet customer specifications for size, pressure, corrosion coatings etc. Available with a NSF-61 Certified interior coating.

  • Pre-Installed Isolation Gasket - Proper gasket compression and bolt load consistency are achieved
  • Pre-Installed Isolation Washers - Improper installation is avoided preventing short circuit via operator error
  • Outstanding electrical isolation properties for cathodic protection
  • Coated Bolts - Redundant corrosion protection for bolted assembly
  • Pre-Wrapped Joint - Encapsulates entire flange including bolt assembly providing corrosion protection to all critical parts
  • Direct Bury

    • B7 Bolts coated with Xylan 1010
    • 2H Nuts with Xylan 1010 coating
    • Single SS Washer with X37 coating
    • Electrical continuity design for bolting
    • Dual seal G10 LineBacker® isolation gasket G10 sleeves
    • Fusion bonded epoxy coating
    • Proprietary isolation flange filler
    • Wax taped flange protection

    Vaulted

    • B7 Bolts coated with Xylan 1010
    • 2H Nuts with Xylan 1010 coating
    • Dual SS Washer with X37 coating
    • Fusion bonded epoxy coating G10 sleeve
    • Dual seal G10 LineBacker® isolation gasket

     

  • ABOUT
  • FEATURES AND BENEFITS
  • SPECIFICATIONS
  • ADDITIONAL INFORMATION
ElectroJoint™ Monolithic Isolation Joints

GPT’s new ElectroJoint™ monolithic isolation joint (MIJ) is a maintenance-free alternative to flanged pipeline connections appropriately sized and priced for gas distribution lines.

The ElectroJoint™ MIJ eliminates the risk of failure due to improper field assembly of traditional flange components by providing a complete coated isolation system that simply requires two butt welds on either end of the joint for installation.

The ElectroJoint™ MIJ is manufactured, individually weld-inspected, and hydrostatically tested under an ISO Quality Management System.

The availability of the ElectroJoint™ MIJ means even more of these pipeline integrity problems caused by human error can now be cost-effectively prevented.

  • Eliminates short circuits, field assembly and maintenance
  • Coated both internally and externally to resist corrosive gas and particulates
  • Individually electrically tested and weld inspected
  • Manufactured under an ISO Quality Management System
  • May eliminate vaulting costs
  • Stocked in ANSI Classes 150#/300#/600# up to NPS 8
  • Each weld is verified utilizing Magnetic Particle Inspection
  • Each MIJ undergoes a hydrostatic test at 1.5x MAOP
  • Quick Installation process
  • 1 year full warranty
  •  
  • 150# ANSI CLASS (PN OR DP 25)

    • 150# ANSI Pressure Rating = 285 psi
    • ElectroJoint™ Continuous Operating Pressure = 300 psi
    • Test Pressure = 450 psi
    • Working Temperature: Range = 1 °F to 158 °F (-17 °C to 70 °C)
    • Electrical Resistance (Dry Air) = ≥ 10 MΩ at 1000 V DC
    • Breakdown Voltage (Dry Air) = 3 kV AC, 50 Hz for 1 minute

    300/600# ANSI CLASS (PN OR DP 100)

    • 600# ANSI Pressure Rating = 1,480 psi
    • ElectroJoint™ Continuous Operating Pressure = 1,500 psi
    • Test Pressure = 2,225 psi
    • Working Temperature Range = 1 °F to 158 °F (-17 °C to 70 °C)
    • Electrical Resistance (Dry Air) = ≥ 10 MΩ at 1000 V DC
    • Breakdown Voltage (Dry Air) = 3 kV AC,50 Hz for 1 minute

Eliminates Short Circuits

Bolts, sleeves and washers — the major source of short circuits in most isolation assemblies — are eliminated with the ElectroJoint™ monolithic isolation joint. Each joint is electrically tested during production to assure integrity, performance and isolating properties to protect against dielectric and galvanic corrosion.

Eliminates Field Assembly

The ElectroJoint™ isolation joint is completely factory assembled and tested. There are no flanges, gaskets, nuts, bolts, sleeves or washers to handle and consequently no fluid leaks due to improper field assembly.

100% Hydrostatically Tested

All ElectroJoint™ MIJs undergo a hydrostatic test at 1.5x MAOP in accordance with ASME B31.3 standards.

Completely Weld Inspected

The integrity of each weld is verified utilizing magnetic particle inspection.  All ElectroJoint™ joints are manufactured under an ISO Quality Management System

  • ABOUT
  • FEATURES AND BENEFITS
  • AVAILABLE SIZES
  • THE U-SEAL DESIGN
  • LICENSES AND CERTIFICATES
ElectroSeal™ Monolithic Isolation Joints (MIJs) are a leak proof, maintenance-free and long lasting block against the flow of electric current in all piping systems

ElectroSeal™ MIJs eliminate short-circuits, field assembly, and are protected from corrosion by internal and external coatings. The ElectroSeal™ MIJs come with a unique U-Sealing design, which provides a dynamic sealing structure to protect it from potential leakage due to pressure fluctuation within the pipeline. All ElectroSeal™ MIJs are manufactured under an ISO Quality Management System. These joints are manufactured to that specification which utilizes the U Seal technology. With a major manufacturing hub based in Langfang, south of Beijing. GPT is well placed to meet the ever increasing market demands for quick response and speedy delivery.

    • Eliminates short circuit, field assembly, and maintenance
    • Prevents corrosion with internal and external coatings
    • Manufactured and delivered with a competitive lead time
    • Uniquely designed with U-Sealing Structure (see Function of U-Sealing)
    • Verified with a variety of standard tests and customizable tests (see List of Standard Tests)
    • Available for witness of tests by 3rd party inspector (EN 10204 type 3.2 certificate)
    • Manufactured under an ISO Quality Management System
    •  
  • Available in any diameter up to DN2000 (NPS 80)
  • Design pressure: up to 1,000 bar (14,500 psi)
  • The ElectoSeal Monolithic Isolation joint utilizes a patented U-seal design providing resistance to high pressure as well as extending the service life of the joint. The proven U shaped self-tight sealing system provides exceptional sealing capabilities, typically outperforming the traditional O-shaped sealing systems. This U type sealing system is constructed by two symmetric U shape sealing ring. The sealing ring is assembled with the rigid insulating ring together and then the assembled sealing system is pressed into the reserved room between two flanges to form a Unique U Style Sealing Ring. This system is usually called “DSGS” (Double Seal Gasket System) - Dual sealing gasket system.

    FUNCTION OF U-SEALING STRUCTURE

    • Symmetrically balanced dual sealing structure
    • Provides reliable sealing especially against bending forces
    • Pressure energized sealing design
    • Prevents non-uniform stress loading even in extreme conditions
    • Anti-Explosive Decompression sealing design
  • ISO QUALITY ASSURANCE

    ElectroSeal™ Monolithic Isolation Joints are manufactured in an ISO 9001:2015 & 14001:2015 certified facility

    HEALTH AND SAFETY MANAGEMENT ASSURANCE

    ElectroSeal™ Monolithic Isolation Joint are manufactured and assembled in an OHSAS 18001:2007 , Q/SHS001.1 – 2001 & Y1002t-2013 health and safety management certified facility