PSI LineSeal™ Sealing and Isolating Gasket

Sealing Gaskets for Zero Fugitive Emissions & Extreme Critical Sealing Applications

LineSeal™ Xtreme Critical Service Gaskets are designed to withstand severe corrosive environments, including high concentrations of CO2, H2S, produced water and aggressive inhibitors even at elevated or fluctuating temperatures. The center of the gasket consists of a high integrity 316 stainless steel core for high hoop strength while a layer of G-10 reinforced laminate is applied to each side to serve as the dielectric sealing material.

Pressure activated seals, with a stainless steel spring, provides elastic memory for polymers not normally associated with this characteristic – resulting in a simple flat gasket with extremely high loading and self energizing characteristics without adverse cold flow problems.

Benefits and Features

• Extreme, high reliability sealing and electrical isolation solution for critical service applications.
• Seals and isolates all pressure ratings through ANSI 2500 class and API 15,000 psi service.
• Withstands severe service conditions including vibration, temperature and pressure fluctuations.
• Designed to withstand corrosive environments, including high concentrations of CO2, H2S, produced water and aggressive inhibitors.
• Good electrical isolation properties for cathodic protection.
• Pressure-activated seals provide high confidence sealing, eliminates costly leaks and provides a solution for fugitive emissions.
• Gasket is sized to the bore to protect flange faces from media-induced corrosion and flow-induced erosion.
• Prevents turbulent flow at flanged connections.
• Mitigates galvanic corrosion in dissimilar metals flanges.
• High strength laminate material resists failure due to excess compression.
• Available to match any flange specification (ANSI, ASME, API, MSS, BS, DIN, AS, and others).
• Can mate mismatched RTJ with raised-face flanges.
• Easy installation, make-up and removal:
  • Sealing system is not sensitive to low bolt loads – providing reliable sealing through a range of bolt stress.
  • Gasket is self-aligning and centering – quick to install and no special tools are required.
• Maintenance-free corrosion-resistant design is resistant to deforming under load.
• Works in ring joint flanges, reducing fluid entrapment, flow induced erosion and media induced corrosion between flanges.

How The Seal Functions

Before Tightening The flange faces have come into contact with the sealing elements, which extend slightly above the surface of the retainer. As the flange is tightened, the sealing elements are compressed into the machine groove – developing an initial high unit pressure against the flange faces.

After Tightening The flange faces come into firm contact with the retainer, thus compacting the sealing elements within grooves. At the same time, the unique LineSeal™ spring energized seal provides elastic memory for polymers not normally associated with this characteristic – resulting in a simple flat gasket with extremely high loading and self energizing characteristics without adverse cold flow problems.

Gasket Types

Type E Gasket The gasket retainer extends out to the O.D. of the flange. Holes are cut in a type “E” gasket at the bolt circle to accommodate threaded studs or bolts.
Type F Gasket The gasket retainer extends out to the I.D. of the bolt circle.

Physical Properties of Retainer for Common LineSeal™ Sealing Gasket

How to Order

To order LineSeal™ Sealing/Isolating Gaskets please indicate the following:

1. Quantity
2. Nominal Pipe Size
3. Pressure Rating
4. Gasket Type: E or F
5. Gasket Style: LineSeal™
6. Retainer Material
7. Sealing Element
8. Weld neck or slip-on application
9. Note all special requirements.

Warranty

Manufacturer’s warranty statement will be supplied upon request to Allied Corrosion Industries, Inc.

Typical Specifications

All Critical Service Applications

Materials for sealing gaskets on pipes containing water, aqueous fluids, oil, sour or natural gas (up to 302®F, 150®C) shall consist of the following components:
Isolating and Sealing Gasket
One isolating and sealing gasket, LineSeal Type “F”, 0.27 inch thick, 316 stainless steel core retainer laminated on both sides with a G-10 fiber glass reinforced laminate containing a precision tapered groove to accommodate the controlled compression of a PTFE(Teflon) spring energized seal. Sealing element placement shall accommodate either flat, raised or RTJ face flanges. The spring energized seal shall be pressure energized. The G-10 retainer shall have a 800 volts/mil dielectric strength and a minimum 69,000 psi compressive strength. The I.D. of the flange isolating gasket shall match the bore of the flange in which it is installed.

Quality

Gaskets shall be manufactured at a facility that has a registered ISO 9001:2008 Quality Management System.

Submittals shall include copy of valid registration. Performance suitability and material compatibility shall be determined by the user.

Availability

Gaskets shall be manufactured by PSI-Pipeline Seal and Insulator, Inc., Houston, Texas, U.S.A.
Telephone: 713-747-6948
Facsimile: 713-747-6029
www.pipelineseal.com.
e-mail: info@psipsi.com
Alternate products should be submitted to an engineer 10 days prior to bid due date.