Product Overview

BenefitsDesign Features Downloads & Links

HMT’s Retro-Fit Mechanical Shoe Seal was designed to solve a common problem in the AST industry: how to add a primary mechanical shoe seal safely and effectively 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.

Benefits

Enables existing AIFRs to convert from floppy wiper seals to mechanical shoe seals

With all the benefits of the HMT Mini-Shoe seal, this seal will outlast common floppy wiper seals multiple times over. This seal eliminates the problem of prematurely degrading wiper seals.

Expanded longevity over floppy wiper seals

With all the benefits of the HMT Mini-Shoe seal, this seal will outlast common floppy wiper seals multiple times over. This seal eliminates the problem of prematurely degrading wiper seals.

Improved emissions loss factor versus vapor-mounted wiper seals

The Retro-Fit Mini-Shoe allows operators to improve not only the durability of their primary seal, but also improve the loss factor used in emissions calculations.

No gapping

The Retro-Fit Mini-Shoe maintains a tight seal even with wide-ranging rim spaces and tank abnormalities

Low-maintenance

Workhorse design and materials

Design Features

Supplemental buoyancy to offset mechanical shoe systemCompression ringHardened-steel pressure componentsEven pressure distributionDesigned for tight rim spacesBest-in-class vapor barriersSized to fit the tank

Supplemental buoyancy to offset mechanical shoe system

Supported by a system of buoyant pontoons — each pontoon is held in place by extruded structural aluminum framing for excellent strength and rigidity

Compression ring

The Retro-Fit Mini-Shoe employs a compression ring system to tie together the existing rim and Mini-Shoe hangers to form a strong and rigid perimeter structure that is strong enough to handle the weight, centering forces, and drag forces of a quality mechanical shoe seal.

Hardened-steel pressure components

Custom-hardened steel will not fatigue over time, maintaining proper sealing pressure against the tank shell and preventing gaps over the life of the seal.

Even pressure distribution

Each shoe is equipped with three sets of pusher bars, for a total of six pressure zones. This ensures even pressure distribution and allows the shoe to conform well to local anomalies in shell roundness.

Designed for tight rim spaces

The innovative feature of this seal is the HMT Mini-Shoe hanger assembly. It successfully maintains positive gap-sealing ability while accommodating rim spaces as small as 2.5 inches.

Best-in-class vapor barriers

Premium fabric options ensure optimal product compatibility and life span, even including flame-retardant PTFE options compliant with DIN 22118 standard.

Sized to fit the tank

All tank shells are not alike, and it’s critical that seals are designed to handle unique rim-space requirements. HMT’s engineering and manufacturing automation allow each seal to be manufactured to fit the specific rim-space and/or verticality data provided by the purchaser, ensuring optimal performance and mitigating the chance of operational issues over time.

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