HMT’s Retro-Fit Mechanical Shoe Seal was designed to solve a common problem in the AST industry: how to safely and effectively add a primary mechanical shoe seal to an existing lightweight aluminum IFR. This seal employs a unique system of pontoons to provide additional buoyancy required at the perimeter and a compression ring to give the rim added strength and torque resistance to handle the drag forces exerted by the shoe seal. The Retro-Fit Mechanical Shoe Seal provides a long service life, compatibility with virtually all stored products and a tight fit to aid in eliminating emissions losses.

Key Benefits
The HMT Retro-Fit Mechanical Shoe Seal’s primary benefits include:
• Compatibility — compatible with most stored products
• No gapping — maintains a tight seal even with wide-ranging rim spaces and tank abnormalities
• Long life — key components made from stainless steel, ensuring spring longevity and long-lasting seal performance
• Low maintenance — workhorse design and materials
• Flexibility — Provides a safe and effective solution to add mechanical shoe seal to existing AIFRs
• Strength — Compression ring stiffens existing rim to strengthen existing floating roof
• Buoyancy — Provides added buoyancy at the perimeter where it’s needed most

Key Design Features
• Supported by a system of buoyant pontoons; each pontoon is held in place by extruded structural aluminum framing for excellent strength and rigidity
• Constructed of materials that are compatible with most stored products including gasoline, crude oil, benzene, ethanol, methanol, toluene, naphtha, MTBE, ETBE and TAME
• Each HMT seal is designed and sized to fit the specific tank and floating roof dimensions
• Premium fabrics for long-life and durability of vapor barrier
• Premium fabrics for long-life and durability
• Horizontal and vertical rim mounts
• Designed with guidance from EPA and local regulations