The HMT ECONO-FLEX™ Secondary Seal is one of the most economical and effective types of secondary seals available. Easily installed and maintained, the HMT ECONO-FLEX Secondary Seal was designed under the guidance of the stringent gap specifications for secondary seals from governmental regulatory agencies throughout the U.S., including Northern California’s BAAQMD and its “zero-gap” requirements.

For a secondary seal that is custom-designed to fit specific tank round anomalies, has exceptional gap sealing ability, allows for in-service installation and has a long service life, choose the ECONO-FLEX™ Secondary Seal.

Key Benefits
The ECONO-FLEX™ Secondary Seal’s advanced design features include:
• No gapping — engineered with custom-hardened stainless steel to ensure tension will hold up year after year and seals won’t gap, maintaining a tight seal
• Long life — key components made from custom-hardened stainless steel, ensuring spring longevity and long-lasting seal performance
• Maintenance-free operation — workhorse design and materials
• In-service install — no hot work required
• Custom designed — each tank has its own variations in roundness and verticality, HMT custom designs every seal to ensure an excellent fit with no gaps

Key Design Features
• Custom-hardened steel will not fatigue
• Continuous fabric vapor barrier under plates
• Excellent flexibility, molds well to shell irregularities
• Premium fabrics for long-life and durability of vapor barrier
• Bolt-on design allows for in-service installation
• Meets Northern California’s BAAQMD stringent “zero-gap” requirements
• Narrow 13” wide, independent support plates allow for improved sealing to all tank radii
• Completely bolted assembly eliminates all rivets which allows for easier and safer tank maintenance