Tank Technic Internal Floating Roof (IFR) Rim Seals
Tank Technic has three different types of IFR Rim Seal:
• Mechanical-Shoe seal
• Liquid-Mounted seal
• Vapour-Mounted seal
Our Floating Roof Rim Seals are custom designed to each individual tank in accordance with API 650/653, BS 2654, EN-14.015 and EEMUA-159 and we continue to develop innovative solutions and products to reduce Above-ground Storage Tank (AST) emissions.
Benefits of Floating Roof Rim Seals
Internal floating roofs typically incorporate a combination of two different types of flexible, product-resistant rim seals: resilient foam-filled seals or wiper seals. Similar to those employed on external floating roofs, each of these seals closes the annular vapour space between the edge of the floating deck and the tank shell to reduce evaporative losses. They are designed to compensate for small irregularities in the tank shell and allow the roof move freely up and down inside the tank without binding.
The sealing materials are selected in accordance with the type of product being stored, to ensure optimal media resistance. Further, the sliding parts of the seal are designed in wear-resistant materials.
Axial movement of Floating Roofs caused by horizontal forces can result in damage to gauge poles, pipe drain systems and rolling ladders. Tank Technic’s superior floating roof rim seals dampen and absorb axial movements to enhance the security and protection of your tanks.
In order to optimise the design, the working range of the roof is analysed and the seal is then designed and manufactured to comply with this range, or other approved standards. This can include, for example, API where a range of +/- 4″(102 mm) is required, or EEMUA 159 and NEN-EN 14015 where a tank seal working range of -X/+3X is needed
Secondary seals, generally manufactured as elastomeric wipers, can be used to provide additional evaporative loss control over that provided by the primary seal. The secondary seal is mounted to an extended vertical rim plate, above the primary seal.
However, using a secondary seal often limits the operating capacity of a tank as contact with the tank shell needs to me maintained. It also needs to avoid interference with the fixed roof rafters on an Internal Floating Roof Tank (IFRT). It is therefore uncommon for secondary seals to be used on IFRTs.
Finally, Tank Technic secondary rims are designed as low as possible in order to maximise filling capacity.
IFR Floating Roof Rim Seals
Tank Technic’s primary Floating Roof Rim Seals include:
• TTRS-1/350 Primary Mechanical Shoe Seal
• TTRS-7/350 Primary Foam Filled Seal
• TTRS-60 Primary XPE Wiper Seal
These can be used either individually or in combination.
Further, all IFR Rim Seals can be combined with;
• TTRS-70 Secondary XPE Wiper Seal
Terminals or refineries often require further tertiary rim seals (Triple Rim Seal). Tank Technic can provide the extra rim seal as necessary