ECONO-FLEX™ Secondary Seal

Secondary Seal for External Floating Roofs


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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