Floating roof tank repair

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Floating roof tank repair

Liquid escapes from two leaky places of a floating roof tank.

The tank is filled with high flammable kerosine, therefore the use of an absolute spark free repair method is mandatory.

The necessary repair of the floating roof has been carried out at an oil group in Rotterdam / Netherlands during a cold period of the year.

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A 6 mm thick steel plate was fixed to the roof by using an epoxy putty in the past.

Since the flexibility of these roofs is quite big the stiff steel plate was unable to follow the movements.

After a few months it started to leak again and it was feared that the plate comes off completely.

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MM-metal oL-steelceramic(+ Hardener red)

has especially been developed for the application on oily, greasy surfaces or surfaces contaminated with fuel (here kerosine) and tested and certified.Therefore it is not necessary to remove any liquid out of the tank before starting the repair. The 2-component-material enables the user to close any cracks or holes immediately. Already after partly curing (appr. 45 min. at 5 °C), the repair area can be cleaned and made grease-free for the application of further material.



Data Sheet

Generally adhesives are unsuitable to close cracks and holes. In addition to that the bonding with oily or greasy surfaces is impossible.

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In the next step two or more layers of

MM-Elastomer 95,

a polyurethane with shore-hardness A 95, is put onto the previously applied MM-metal oL-steelceramic and the surrounding steel area in an overlapping way.

This 2-component-material can be applied by brush or spatula; a primer is not necessary.

MM-Elastomer 95

Data Sheet

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This leakage of a different floating roof was easily identified because the fluid on the tank shows oil-like clouds in the rainwater.

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Before the technicians started their work, three repaired leaks have been inspected, which have been coated with MM-metal oL-steelceramic one year ago. They were found to be perfectly ok.

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Loose pieces of rust must be removed from the area to be coated while the place is kept as dry as possible at the same time. Therefore a vacuum pump was installed in a distance of appr. 25 m.

Then the area is thoroughly roughened up by using abrasive paper.

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The repair place and an other leakage was closed withMM-metal oL-steelceramic

(+ Hardener red)

Data Sheet


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Within the pot life it is checked if the liquid does not penetrate the curing PolymerMetal.

Then the repair spot is mask-taped.

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MM-Elastomer 95 is applied and in the final step the masking tape is removed.

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Advantages of this repair method• Removal of the medium out of the tank is not necessary• Very quick repair• No use of special tools required• Even possible at very low temperatures up to 5 °C• Tested material MM-metal oL-steelceramic offers technical reliability at

application on oily, greasy surfaces or surfaces contaminated with• Compensation of flexible wave movements of the roof because of the strong

but flexible material MM-Elastomer

Note: After successful repair the concerned oil group recommends the use of this repair technique in their network (intranet).

Before using MM-Elastomer it should be checked, if this material is resistant to the tank‘s liquid. If the material can‘t be recommended, alternative methods are possibly available.

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MM-metal oL-steelceramic

Data Sheet

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MM-Elastomer 95

Data Sheet

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PolymerMetall® made by MultiMetall

MultiMetall Germany invests for more than 40 years in polymer-metallic material technologies for the maintenance of metals and alloys. In plants and constructions often functional particularly important components are exposed to stresses like break, tear, corrosion, cavitation, chemical or thermal demands.

Components treated with PolymerMetals can be preventatively protected against above mentioned stresses. Furthermore MultiMetall’s cold repair technology facilitates a gentle material treatment and a durable repair of damaged parts.

MultiMetallthe MetalExistenceCompany®

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MultiMetall & Internet

Please feel free to visit our website! At www.polymermetal.com detailed information on our products and their usage can be found.

Here are some screenshots of our website:

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PolymerMetall® • MultiMetall® • Ceramium® • Molymetall® • Sealium® • XETEX®

Essential parts of this publication are based on the presentation and information, kindly provided by EMHA technisch bureau b.v..

EMHA technisch bureau b.v. is our exclusive partner in the Netherlands, who successfully carries out repairs by using our PolymerMetals for many years.

EMHA B.V.Noordeinde 133341 LW Hendrik Ido AmbachtNetherlands

Tel: +31 180484343Fax: +31 [email protected]

MultiMetallP.O. Box 12 02 6441720 ViersenGermany

Tel: 0 21 62-97 00 9-0Fax: 0 21 62-97 00 [email protected]

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Floating roof tank repair