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Integral foam dam
Foam dams are installed on both external and internal floating roofs to concentrate fire fighting foam in the seal area .Fires typically occur at this seal area.The common design for a foam dam is a welded construction in the rim area of the roof. There are several disadvantages of awelded foam dam. An integra foam dam, fitted to the rim angle of the floating roof offers significant benefits. It is bolted directly to the rim angle and the base of the secondary seal. It is a well testedmodular design and can be installed in littel time. The integral foam dam can be supplied in both steel and stainless steel, engineered to match any secondary seal involved
Integral foam dam, features:
- maintenance free, no need for any (future) blasting or painting
- extensively tested
- can be installed on tanks in service
- reduces foam consumption considerably (up to 50% reduction)
- allows fast accumulation of foam
- adaptable to both horizontal and vertical rim angles
- can be manufactured in stainless steel, resulting in a maintenance free solution
- lifetime expectation in excess of 20 years
- designed for each specific tank and seal arrangement
- easy installation, full installation manuals and project support available
- complies with all relevant API standards
- successfully used by many globally present major oil and tank storage companies
- reduces corrosion of rim angles due to water between the seal and the foam dam |
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Design and engineering
Typically an integral foam dam will be engineered to match the tank and tank seal involved. As mentioned maerials would either involve galvanise steel or stainless steel, where the latter obviously represents the longer lasting alternative. Delivery will include an as-built drawing for the integral foam dam as well
Installation
CTS is certainly able to install an integral foam dam for any tank, but our extensive drawings and installation manuals will facilitate you to have either your own staff or contractor staff installing the integral foam dam as well. Advantage of having your own (contractor) staff installing the system could be significant, reducing travelling and staying costs. Experienced CTS supervision will be available on request
Conventional welded foam dam
Traditional foam dams are welded steel structures, usually welded to the top of the pontoon area and equipped with drain holes. Major concern is the fact that this foam dam is trapping rain, corrosion from the tank shell and any product scraped from the tank shell by the secondary seal or flowing down as a result of the tank shell being warmed up from exposure to bright sun light. As a result of the drain holes getting blocked with this debris the water will accumulate and expose the rim angle to aggressive corrosion (see picture). Both foam dam modifications and replacements as well as rim angle replacements will result in major refurbishing costs for external foating roof tanks.
Deal with these aspects once and for all by installing a CTS integral foam dam
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