AB-326™ Anti-Buckling!Low Stress Spiral Wound GasketsInnovate Service Perform!!

8140 Quality Drive Prince George, VA 23875!800-334-6013 vsptechnologies.com

Prince George, VA | Kingsport, TN | Houston, TX | Parkersburg, WV

“By the Inventors of Spiral Wound Anti-Buckling &

Controlled Density Technology”1

AB-326™ !Anti-Buckling Design!!

Prevents radial buckling without !problematic or costly inner rings

Outward Radial Flow !Channeled to Relief Ports

During Compression!!Prevents Radial Buckling!

& Unwinding

Relief Port & Winding!Before

Compression

Relief Port & Winding!After

Compression

Low Stress: Suitable for all ASME flange Classes 150 - 2500

Compliance with ASME B16.20 paragraph 3.2.6 compression requirements

One spiral wound gasket for all size, type and pressure class flanges

Low-Emission Performance: Lower than conventional spiral wound gaskets

Anti-Buckling Design: Eliminates the need for costly, problematic inner rings

No flow restriction!Low assembly torque

VSP Technologies deploys a team of 26 Engineers and Fluid Sealing Specialists who provide engineered solutions to achieve your sealing requirements.

Prince George, VA | Kingsport, TN | Houston, TX | Parkersburg, WV

AB-326™ Anti-Buckling!Low Stress Spiral Wound Gaskets

Note:!≈1/4” Inward Radial Flow

Standard! Spiral Wound Gasket!Before Compression

AB-326™ Anti-Buckling!Relief Port

Designed to Channel Gasket Flow!Away from the ID

Innovate Service Perform

A B - 3 2 6 ™ G a s k e t s a r e designed to seat at 5,000 psi. Conventional spiral wound gaskets require 7,500 psi to >10,000 psi to seat and compress down to the outer guide ring.

Standard! Spiral Wound Gasket!

After Compression

Full Compression

Relief Ports on the AB-326™ allow for controlled gasket flow which results in; !!Less inward radial flow!!Seating stress reduced !by as much as 50%!

AB-326™ Anti-Buckling!Low Stress Spiral Wound Gaskets

Prince George, VA | Kingsport, TN | Houston, TX | Parkersburg, WV

Inner rings are incorporated into conventional spiral wound gaskets to prevent inward buckling & unwinding, but are inner rings the best solution?

NPS 2 x 150 304/FG

Innovate Service Perform

Low-Stress Flexible Graphite Filler

w/Inner Ring [0.8]

First Generation!Flexible Graphite Filler

w/Relief Ports [1.0]

Standard Flexible Graphite Filler

w/Inner Ring [0.8]

VSP AB-326 Flexible Graphite Filler

(Anti-Buckling) [1.0]

Inner Rings Add cost!!Stiffen the ID of the gasket but do not address the underlying cause of buckling3!!Provide little or no sealing advantage!!Confine gasket flow & result in very high torque requirements to seat the gasket and create potential for;

Bolt yield prior to full compression!• Cupped outer rings!• Flange deformation

AB-326™ Anti-Buckling!Low Stress Spiral Wound Gaskets

Prince George, VA | Kingsport, TN | Houston, TX | Parkersburg, WV VSP Technologies ©!9/2014 2000

AB-326™ !Anti-Buckling!

Spiral Wound Gaskets

Innovate Service Perform!!8140 Quality Drive Prince George, VA 23875!

800-334-6013 vsptechnologies.com

1 U.S. Patent #5,964,468!2 VSP Technical Bulletin “Changes to ASME B16.20-Compliance Options”, 2008!3 ASME PVP 2009-77422, “Compression Behavior of Spiral Wound Gaskets”, Waterland, Bouzid

Available Dual-Flange Design!!• Fit both 150 & 300 Class flanges!• Designs available for non-standard

pressure vessel equipment flanges

Best available control technology for low emissions performance where spiral wound gaskets are required

Compliance with ASME B16.20 paragraph 3.2.6 compression requirements

Accommodates the inherent radial compression behavior of spiral winding, and minimizes radial buckling forces

Designed to fit all slip-on, lap joint and weld neck/socket weld type flanges

AB-326™

Technical Data/Specifications

Standard Construction304/OIFG 316/ePTFE316/OIFG 316/ePTFE/FG Inpherno

ASME Gasket Factors:m = 3.0

Y = 5,000 psi

ROTT Gasket Factors Temperature LimitsGb = 644 psi ePTFE = 500 °F

a = 0.341 ePTFE/FG Filler = 600 °FGs = 5.8 psi OIFG Filler (Standard) = 1000 °F

*OIFG - Oxidation Inhibited Flexible Graphite