Introduction
The document introduces the Flexitallic "LSI" spiral wound gasket, a product reflecting over 80 years of experience in high-performance static sealing technology. Flexitallic, the inventor of the spiral wound gasket, has enhanced this technology to a new level, supported by ISO certification and comprehensive engineering support.

Specifications and Features
The "LSI" gasket is designed to seat at only 25,000 psi bolt stress, making it suitable for a wide range of lightly loaded applications, including Class 150 service. It adheres to ASME B & PV and ASME B31.1 codes, ensuring bolt stresses do not exceed 25,000 psi. The gasket features a PTFE filler for secure sealing across the pH scale, enhancing sealing performance and reducing fugitive emissions. Its construction eliminates gasket creep, reduces maintenance costs, increases blowout protection, and offers unmatched high-temperature and chemical resistance.

Torque Recommendations
Flexitallic provides recommended minimum bolt torque figures for the "LSI" gasket on ASME/B16.5 flanges, with specific values for different NPS (Nominal Pipe Size) ranging from 1/2 inch to 4 inches. The document notes that minimum required torques may vary based on gasket size and bolt materials.

Design Features
The "LSI" gasket includes an extruded filler for use with lightly loaded flanges and retains more of its initial stress even at high temperatures. It is available with Flexicarb, Thermiculite™, or PTFE filler. The gasket's low-stress construction allows sealing at sheet gasket torques, and a metallic centering ring provides blowout resistance and compression stop. The design significantly reduces gasket creep, and a metallic inner ring protects sealing elements.

Comparative Performance
Graphs in the document compare the performance of the "LSI" gasket against traditional spiral wound gaskets and PTFE sheets, highlighting its superior stress retention and temperature resistance.

Global Presence
Flexitallic operates plants in the USA, Europe, and China, with affiliated companies in various countries worldwide, indicating a strong global presence in the sealing technology sector.