Durlon® iGuard Flange Isolation & Sealing Kits

Durlon® iGuard™ flange isolation and sealing systems consist of all the necessary components to seal, electrically isolate, and cathodic protection (corrosion control) between flanges in general to severe service applications such as water, wastewater, natural gas, hydrocarbons, caustics, acids, and other aggressive media to 232°C (450°F). Gaskets are available for full face (Type E), raised face (Type F), and ring type joint (RTJ) flanges (Type D) from NPS ½” (DN 15) to NPS 144” (DN 3600) or equivalent to meet all international piping sizes. iGuard™ gaskets meet AWWA, ANSI, API, DN, JIS and all other dimensional standards. The standard iGuard™ flange isolation kit consists of a gasket, isolating washers, backing washers, and isolating bolt/stud sleeves. Gasket selection can be made from a wide variety of materials to best suit the sealing and performance characteristics of the application. In gaskets with phenolic or glass carrier rings, the double-ogee sealing element provides a reliably concentrated unit load on the flanges using the lowest torqueing conditions possible.

General Features:

  • Auto-Energizing double-ogee seal
  • Low torque requirements
  • Tri-directional seal movement for a tighter seal

Applications:

  • Gas
  • Waste Water
  • Potable Water
  • Steam
  • Oil
  • Chemicals (caustic, acid)
  • Pipelines
  • LNG

Industries:

  • Oil & Gas
  • Pulp & Paper
  • Petro Chemical
  • Refining
  • Water/Wastewater
  • Food & Beverage
  • Marine
  • Aerospace
  • Chemical
  • LNG

Gasket Options

Carrier Sealing Element
 Nitrile.. EPDM..  Viton..  PTFE..
Plain Phenolic
Neo-Faced Phenolic G-3..
Silicone Glass G-7
Epoxy Glass G-10
Epoxy Glass G-11
Durlon® 8400 n/a n/a n/a n/a
Durlon® 8500 n/a n/a n/a n/a
Durlon® 9000 n/a n/a n/a n/a

Typical Properties:

ASTM.
Test Method
Plain Phenolic
Neo-Faced Phenolic
Hi-Temp Phenolic G-3
D149 Dielectric Strength, volts/mil 500 500 550
D695 Compressive Strength, psi 25,000 25,000 50,000
D229 Water Absorption, % 1.60 1.60 0.70
D257 Insulation Resistance, meg/ohms 40,000 40,000 46,000
D790 Flexural Strength, psi 22,500 22,500 60,000
D785 Hardness Rockwell, “M” 85 85 115
D256 IZOD Impact Strength, ft-lbs/in. 1.2 1.2 8
D732 Shear Strength, psi 10,000 10,000 18,000
Operating Temperature 54°C to 104°C -54°C to 79°C -54°C to 200°C
-65°F to 220°F -65°F to 175°F -65°F to 392°F

 

ASTM Test Method
Silicone Glass G-7
Epoxy Glass G-10
Epoxy Glass G-11
D149 Dielectric Strength, volts/mil 350 – 400 550 550
D695 Compressive Strength, psi 40,000 50,000 50,000+
D229 Water Absorption, % 0.07 0.10 0.10
D257 Insulation Resistance, meg/ohms 2,500 200,000 200,000
D790 Flexural Strength, psi 27,000 60,000 75,000+
D785 Hardness Rockwell, “M” 105 115 115
D256 IZOD Impact Strength, ft-lbs/in. 8 14 12
D732 Shear Strength, psi 20,000 22,000 22,000
Operating Temperature Cryogenic to 232°C Cryogenic to 138°C -54°C to 200°C
Cryogenic to 450°F Cryogenic to 280°F Cryogenic to 177°F

Available Styles:

iGuard™   EN The iGuard™ EN style isolation gasket is manufactured from Nema grade G-10 / FR-4 glass epoxy material incorporating a Viton double-ogee sealing element. These kits come standard with one iGuard™ EN gasket, two isolating Nema grade G-10 washers and one Nema grade G-10 sleeve tube for every bolt/stud.
iGuard™   HC
The iGuard™ HC style isolation gasket is manufactured from special high-compression 6mm (¼”) thick Nema grade G-10 glass epoxy material incorporating a spring energized PTFE sealing element to prevent cold flow under high pressures. These kits come standard with one iGuard™ HC gasket, two isolating Nema grade G-10 washers, two SAE zinc plated steel backup washers, and one Nema grade G-10 sleeve tube for every bolt/stud.
iGuard™   CS The iGuard™ CS style isolation gasket is manufactured from 3mm (1/8”) thick Nema grade G-10 glass epoxy material bonded to a 316 stainless steel internal core with a spring energized PTFE sealing element to prevent cold flow in critical service applications under continuous reciprocating movement or internal pressure surges at elevated temperatures. This design makes the iGuard™ CS ideal for API Class 15,000 and ANSI Class 600, 900, and 2,500 flange applications. These kits come standard with one iGuard™ CS gasket, two isolating Nema grade G-10 washers, two SAE zinc plated steel backup washers, and one Nema grade G-10 sleeve tube for every bolt/stud.
iGuard™   HT The iGuard™ HT style isolation gasket is manufactured from 6mm (¼”) thick Nema grade G-10 glass epoxy material incorporating a spring energized PTFE sealing element to prevent cold flow in critical service applications at higher temperatures, under continuous reciprocating movement, with internal pressure surges, and requiring frequent removal and installation such as those found in offshore drilling platforms and natural gas compressor and pumping stations. This design makes the iGuard™ HT ideal for ANSI Class 150 to 2,500 and API Class 3,000 to 10,000 and comes in sizes from NPS ½” (DN 25) to NPS 24” (DN 600) or international equivalents in Type E (full face) or Type F (raised face) configurations. These kits come standard with one iGuard™ HT gasket, two isolating Nema grade G-10 washers, two SAE zinc plated steel backup washers, and one Nema grade G-10 sleeve tube for every bolt/stud.
iGuard™ 8400 The iGuard™ 8400 style isolation gasket is manufactured from 3mm (1/8”) thick genuine Durlon® 8400 phenolic fiber gasket material to improve sealability in critical service chemical environments from pH 2-13 and other aggressive media to 232°C (450°F). This design makes the iGuard™ 8400 ideal for ANSI Class 150 and 300 and comes in sizes from NPS ½” (DN 25) to NPS 96” (DN 2400) or international equivalents in Type E (full face) or Type F (raised face) configurations. These kits come standard with one iGuard™ 8400 gasket, two isolating Nema grade G-10 washers, two SAE zinc plated steel backup washers, and one Nema grade G-10 sleeve tube for every bolt/stud.
iGuard™ 8500 The iGuard™ 8500 style isolation gasket is manufactured from 3mm (1/8”) thick genuine Durlon® 8500 aramid fiber gasket material to improve sealability in steam environments to 232°C (450°F). This design makes the iGuard™ 8500 ideal for ANSI Class 150 and 300 and comes in sizes from NPS ½” (DN 25) to NPS 96” (DN 2400) or international equivalents in Type E (full face) or Type F (raised face) configurations. These kits come standard with one iGuard™ 8500 gasket, two isolating Nema grade G-10 washers, two SAE zinc plated steel backup washers, and one Nema grade G-10 sleeve tube for every bolt/stud.
iGuard™ 9000 The iGuard™ 9000 style isolation gasket is manufactured from 3mm (1/8”) thick genuine Durlon® 9000 glass filled PTFE gasket material to improve sealability in critical service chemical environments from pH 0-14 and other aggressive media and from temperatures between -73°C (-100°F) to 232°C (450°F). This design makes the iGuard™ 9000 ideal for cryogenic, petrochemical, pharmaceutical, semiconductor manufacturing, and food and beverage manufacturing applications in ANSI Class 150 and 300 or international equivalents and comes in sizes from NPS ½” (DN 25) to NPS 144” (DN 3600) in Type E (full face) or Type F (raised face) configurations. These kits come standard with one iGuard™ 9000 gasket, two isolating PTFE washers, two SAE zinc plated steel backup washers, and one PTFE sleeve tube for every bolt/stud.