COREGUARD™ Gaskets

The COREGUARD Tandem Sealing/Isolation Gaskets utilizes Tandem Seal Configuration (two seals per gasket face) for subsea applications. The back-up Viton O-ring Seals are bidirectional and can thus stop external pressure from the sea water while the Spring Energized PTFE main seal stops in the internal pipe pressure.

General Description

COREGUARD Gasket Manunfactured by 3-Flow, Inc., 
an engineered equal to the Picotek VCS-Line-Seal gasket

The COREGUARD™ sealing/isolating gasket system is designed for critical/extreme applications. Manufactured with a 316 stainless steel core retainer and laminated on both sides with high strength laminates, the COREGUARD™ gasket is resistant to deforming under load and is used when electrical isolation and corrosion control are required on pipes containing gas, natural gas, oil and other hydrocarbon based medias up to 392ºF (200ºC).
Available for flat face, raised face and ring type joint flanges from 1/2" to 48" (and corresponding API and DN diameters), ANSI 150-2500#, API 2-10K and PN420, the COREGUARD™ gasket is an engineered solution for trouble-free operation that eliminates costly leaks and provides a solution for fugitive emissions.
Manufactured with an innovative industry first Press-n-Lock™ "Glue-Less Seal & Groove Technology" that combines a press-in, pressure activated and spring energized seal with a unique groove that retains the seal element without the use of glue on key contact surfaces!
The Press-n-Lock feature provides a higher confidence in sealing.



COREGUARD Gaskets are laser engraved with company name/logo, date of manufacture, and product description/part number.


Before Tightening
The flange face makes initial contact with the sealing element which protrudes above the gasket retainer surface (isolation material) laminated on both sides of the stainless steel core.

After Tightening
The spring energized, pressure activated sealing system is initiated. The base of the Teflon® seal is contained within the stainless steel core to provide superior sealing strength for critical/extreme sealing applications. The spring prevents over-compression of the Teflon® seal thereby allowing the pressure of the media within the pipe to activate the seal. G10 or G11, lamiinated on both sides, provides the dielectric strength needed to isolate the flange application and has the compressive strength to easily withstand high bolt loads.



Retainer Materials (G10S, G11S)


Gasket/Retainer Material Specifications

ASTM

TEST METHOD

G10S

G11S

D149

Dielectric Strength Volts/Mil Short Time

750-800

550

D695

Compressive Strength (psi)

65,000

63,000

D570

Water Absorption (%)

0.05

0.10

D790

Flexural Strength (psi)

65,000

60,000

D256

IZOD Impact Strength (Ft-lbs/Inch

14.0

12.0

D638

Tensile Strength (psi)

50,000

42,000

D732

Bond Strength (lb)

2,600

2,200

 

Temperature - Operating

Cryogenic -238°F (-150°C) to +302°F (+150°C)

-100°F (-73°C) to +392°F (+200°C)

NOTE: Operating Temperature for Gaskets and Flange Isolation Kits is based off the Gasket Retainer Temperature. Seal element temperature does not dictate the Min. and max. gasket operating temperature.


Seal Element Materials


Seal Element Material Specifications

Sealing Element

Temperature - Operating

Teflon®

Cryogenic to +525°F (+274°C)

Nitrile

-40°F (-40°C) to +250°F (+121°C)

Viton®

-20°F (-29°C) to 392°F (+200°C)


Configurations for Gasket Type and Sleeve and Washer Sets


Type "E" Gasket
Fits over the bolt holes and extends to the O.D. of the flange to assist contractors as the bolt holes automatically center the gasket. Provides excellent protection against shorting out of the corrosion mitigation hardware.

Type "F" Gasket
Fits within the bolt hole circle of the flange and extends to the I.D. of the bolt circle providing good protection against shorting out of the corrosion mitigation hardware.

"E" or "F" Type Gaskets
In general, 99% of Steel Core Gasket Applications are type "F", no bolt holes. The COREGUARD gasket is also available in a Type "E" configuration.


Single Washer Set
One isolation sleeve, one steel washer and one insulating washer for each stud/bolt.

Double Washer Set
One isolation sleeve, two steel washers and two insulating washers for each stud/bolt.


Suggested Sleeve/Washer Set

SD = Standard (G10 Sleeves, Steel Zp Washers and G10 Washers) - Double Washer Set