SECTION 09970 INTERIOR COATING OF WELDED STEEL PETROLEUM FUEL TANKS (cont.)

TANKS, which is identical to this specification,

except that it specifies a three-coat epoxy system.

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NOTE: The metric standard for measuring coating

thickness is microns (25.4 microns=1 mil - use

nominal 25 microns=1 mil).

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NOTE: The designer should not alter the products and

processes specified herein without careful

evaluation.

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NOTE: This specification is for a 3 Coat, thin film

system, which is compliant with EPA VOC regulations

as of June 2000.

- Epoxy Coats 350 g/l 2.8#/gal max. VOC

- Fluoropolyurethane Topcoat 350 g/l 2.8#/gal max.

VOC

The designer shall review state and local

regulations and determine whether the coating in

this Section complies with restrictions on volatile

organic compounds (VOC) and other chemical

constituents.

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NOTE: For tanks of limited requirement, 10 years or

less expected life, the appropriate substitution for

the Modified FPU topcoat is Mil-DTL-24441/31,

Formula 152 (white), Type IV. In this situation,

use Section 09973 INTERIOR COATING OF WELDED STEEL

PETROLEUM FUEL TANKS, which is identical to this

Section except for the topcoat. Do not make this

substitution as a cost-savings tool.

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NOTE: Previous versions of this specification have

included a requirement for surfaces to be abrasive

blasted to SSPC SP 7, inspected, and repaired, prior

to coating. That requirement has been removed from

this specification, and if required for a repair

project, it should be included in the structural

repair Section of the project specification. Tailor

the paragraph to the needs of cleaning that will be

required in preparation for repairs, and note that

the abrasive blasting for inspection should be

accomplished in such a manner that it does not

conflict with any surface condition requirements in

this Section, such as creating excessive surface

profile that may require excessive primer thickness.

SECTION 09970

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