External Secondary Wiper Seals for Floating Roof Tanks
Compression Plate Type Rim-Mounted Wiper Seal
The HMT Secondary Wiper Seal is a proven secondary seal that has been protecting storage tanks in the AST industry for over 40 years. The HMT Secondary Wiper Seal has exceptional gap sealing ability, long service life, and maintenance-free operation. The HMT Secondary Wiper Seal is designed to accommodate wide rim-space variations and conforms well to tank-shell anomalies.
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Benefits
- Exceptional gap sealing
Support plates are made of specially hardened stainless steel which ensures that the spring pressure is maintained year after year and the seal remains tight. - Long life
Made of high-quality, corrosion-resistant and inert materials, this seal generally outperforms other seals on the market. - Maintenance-free operation
Robust design and choice of materials provide reliable operation without the need for maintenance. - Multiple wiper tips available
Available for various products and both welded and riveted tank shells. - Capable of being installed in service
Bolt-mounted design means no hot work is required.
Design features
Double-layer wiper tip
The HMT Secondary Wiper Seal utilizes a multiple-wiper tip assembly to conform well to the tank shell and maintain an excellent 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.
Continuous vapour barrier under compression plates
The HMT Secondary Wiper Seal utilizes continuous fabric vapor barrier under the compression plates, ensuring far better seal integrity than systems that rely on gaskets between plates.
Narrow compression plates
The HMT Secondary Wiper Seal has narrow compression plates for excellent flexibility and conformation to tank shell deviations, but also to reduce wiper tip wear versus compression plate systems with wider plates, which concentrate tip pressure at the overlaps and create uneven wear.
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. We offer a variety of fabric choices depending on your service requirements. Our standard PTFE fabrics are laminated and are unsurpassed in terms of durability, impermeability, and service life. HMT’s fabrics will wear extremely well in even the most aggressive services.
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.
Documents for download
HMT is a leader in the energy industry for aboveground tank technology and environmental solutions for the storage of oil and gas products.
HMT's products include internal and external sealing systems, including gas-tight primary seals, floating suction and drainage systems, aluminium vaults, pontoon-based floating roofs, full contact roofs, seamless composite roofs and various emission reduction devices.
HMT operates throughout the United States as well as in Europe and the Middle East.
Our customer promise
Right solution, technical expertise and commitment is what you can expect from us as your partner or supplier.
Solutions
Solutions for specific applications in environmental and process engineering, as well as industrial spray processes.
Right solution, delivered on time
Delivering the right solution on time requires co-operation, structure, attention to detail and following a process throughout the project.