GGG-T-2761
3.4.3 Steel. Steel plates, shapes, and bars shall conform to
ASTM A 36/A36M, ASTM A 242/A242M, or ASTM A 572/A572M, as applicable, and as
standard with the manufacturer.
3.4.4 Steel castings.
Steel castings shall conform to ASTM A 148/A148M.
3.4.5 Steel forgings.
Steel forgings shall conform to ASTM A 668.
3.4.6 Brass.
Brass bars and pins shall conform to ASTM B 21, C46400.
3.5 Interchangeability. All units of the same classification furnished with
similar options under a specific contract shall be identical to the extent
necessary to insure interchangeability of component parts, assemblies,
accessories, and spare parts.
3.6 Cleaning. treatment. and painting. Surfaces normally painted in good
commercial practice shall be cleaned, treated, and painted as specified herein.
Unless otherwise specified (see 6.2), the color of the finish coat shall the
manufacturer's standard. Surfaces to be painted shall be cleaned and dried to
insure that they are free from contaminants such as oil, grease, welding slag
and spatter, loose mill scale, water, dirt, corrosion product, or any other
contaminating substances. As soon as practicable after cleaning and before any
corrosion product or other contamination can result, the surfaces shall be
prepared or treated to insure the adhesion of the coating system. The painting
shall consist of at least one coat of primer and one finish coat. The primer
shall be applied to a clean, dry surface as soon as practicable after cleaning
and treating. Painting shall be with manufacturer's current materials according
to manufacturer's current processes and the total dry film thickness shall be
not less than 2.5 mils over the entire surface. The paint shall be free from
runs, sags, orange peel, or other defect.
3.7 Workmanship. The quality of workmanship shall meet the standards
prevalent among manufacturers who normally produce equipment of the type
specified herein.
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3.7.1 Steel fabricati on. The steel used in fabrication shall be free from
kinks, sharp bends, and other conditions which would be deleterious to the
finished product. Manufacturing processes shall not reduce the strength of the
steel to a value less than intended by the design. Manufacturing processes
shall be done neatly and accurately. All bends shall be made by controlled
means to insure uniformity of size and shape.
3.7.2 Welding. Welding procedures shall be in accordance with a nationally
recognized welding code. The surface of parts to be welded shall be free from
rust, scale, paint, grease, or other foreign matter. Welds shall be of
sufficient size and shape to develop the full strength of the parts connected by
the welds. Welds shall transmit stress without permanent deformation or failure
when the parts connected by the weld are subjected to proof and service
loadings.
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