SECTION 09972 INTERIOR COATING OF WELDED STEEL WATER TANKS (cont.)

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NOTE: This guide specification should be used with

Section 09971 EXTERIOR COATING OF STEEL STRUCTURES

(Navy & AF) when complete interior and exterior

coating systems are required.

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NOTE: This guide specification complies with the

intent of Air Force ETL 86-4.

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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. This specification is easily modified

to accommodate many different coating systems,

particularly if required for maintenance coating.

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NOTE: The specified system is a 3 Coat, thin film

system, which is compliant with EPA VOC regulations

as of June 2000.

- MIL-DTL-24441 Epoxy Coats 350 g/l 2.8#/gal max. VOC

- NSF certified coatings should be monitored for

compliance with required regulations.

The designer shall review state and local,

regulations and determine whether the coating in

this Section complies with restrictions on volatile

organic components (VOC) and other chemical

constituents.

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NOTE: Designs of tank linings for existing tanks

should be based on recent inspections. Wherever

possible, a coating inspection, or coating condition

survey (CCS), as described in Section 09971 EXTERIOR

COATING OF STEEL STRUCTURES, should be accomplished

prior to designing a coating project for water tank

interiors. The hazard of designing a project

without a recent inspection is that there is little

way of knowing the condition of the coating system,

or the steel surfaces, without competent inspection.

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NOTE: Previous versions of industrial coating

guide specifications have included a requirement for

surfaces to be abrasive blasted to SSPC SP 7,

SECTION 09972

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