Flex-A-Seal™ secondary seal
Edge seal with compression plate mounted on the edge
HMT Flex-A-Seal Secondary Seal is one of the most economical and effective types of secondary seals available. It is easy to install and maintain. Flex-A-Seal has been proven to meet or exceed the stringent gap requirements for secondary seals, gaining regulatory approval in both the US and European markets.
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Advantages of the programme
- No gaps
The seal is specifically sized for each tank and built from specially hardened stainless steel, ensuring that the tension will hold over year after year and maintain a seal over time. - Long life span
All pressure components are made of specially hardened stainless steel to prevent deformation under load, ensuring long-lasting spring function and reliable sealing performance. - Excellent weather protection
Flex-A-Seal has a scraper tip that fits snugly against the tank shell, minimising rainwater ingress into the stored product. - Can be installed during operation
Bolt-mounted design means no heat treatment is required.
Construction details
Hardened steel pressure components
Specially hardened steel does not fatigue over time, maintains the correct sealing pressure against the tank shell and prevents leakage throughout the life of the seal.
Continuous vapour barrier under compression plates
Flex-A-Seal uses a continuous fabric vapour barrier under the compression plates, providing significantly better seal integrity than systems that rely on gaskets between plates.
Narrow compression plates
The narrow plates provide excellent flexibility and adaptation to tank shell deviations, while reducing wear on the scraper tip compared to wider plates that concentrate pressure at the joints and cause uneven wear.
Top-class vapour barriers
Premium fabrics ensure optimal product compatibility and long service life, including flame retardant PTFE according to DIN 22118. HMT offers several fabric options depending on operational requirements. Our standard PTFE weaves are laminated and superior in terms of durability, impermeability and service life. The fabrics can handle even the most demanding operating conditions very well.
Adapted to the tank
Every tank shell is unique, and it is critical that seals are designed to address specific edge spaces. HMT's engineering and automated manufacturing allows each seal to be manufactured exactly to the customer's edge space and/or verticality data, ensuring optimum performance and minimising the risk 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.