2.2.7.6
Bearings
Bearings may be lined with babbit or bronze unless otherwise specified or
shown. Where the bearing pressure is in excess of 1400 kPa 200 psi,
bearings shall be lined with bronze. Pressures on lined bearings shall not
exceed [_____] kPa psi of projected area unless otherwise required or
authorized. Anti-friction bearings of approved types and of sizes not less
than those recommended by the bearing manufacturer for the duty intended
will be permitted subject to approval. All bearings shall be properly
aligned and provided with a suitable means of lubrication. Anti-friction
bearings shall be so installed as to provide for retention of the lubricant
and to exclude dirt and grit.
2.2.8
Miscellaneous Provisions
2.2.8.1
Metallic Coatings
a. Zinc Coatings - Zinc coatings shall be applied in a manner and of a
thickness and quality conforming to ASTM A 123/A 123M. Where zinc
coatings are destroyed by cutting, welding or other causes the affected
areas shall be regalvanized. Coatings 50 g 2 ounces or heavier shall
be regalvanized with a suitable low-melting zinc base alloy similar to
the recommendations of the American Hot-Dip Galvanizers Association to
the thickness and quality specified for the original zinc coating.
Coatings less than 50 g 2 ounces shall be repaired in accordance with
ASTM A 780.
b. Cadmium Coatings - Cadmium coatings shall be of a quality and
thickness conforming to the requirements of ASTM B 766 and inspection
shall conform to the requirements of ASTM E 165, Type [_____].
c. Chromium Coatings - Chromium coatings for engineering use shall be
applied in conformity with ASTM B 177.
2.2.8.2
Cleaning of Corrosion-Resisting Steel
Oil, paint and other foreign substances shall be removed from
corrosion-resisting steel surfaces after fabrication. Cleaning shall be
done by vapor degreasing or by the use of cleaners of the alkaline,
emulsion or solvent type. After the surfaces have been cleaned they shall
be given a final rinsing with clean water followed by a 24 hour period
during which the surfaces are intermittently wet with clean water and then
allowed to dry for the purpose of inspecting the clean surfaces. The
surfaces shall be visually inspected for evidence of paint, oil, grease,
welding slag, heat treatment scale, iron rust or other forms of
contamination. If evidence of foreign substance exist the surface shall be
cleaned in accordance with the applicable provisions of ASTM A 380. The
proposed method of treatment shall be furnished for approval. After
treatment the surfaces shall be visually reinspected. Brushes used to
remove foreign substances shall have only stainless steel or nonmetallic
bristles. Any contamination occurring subsequent to the initial cleaning
shall be removed by one or more of the methods indicated above.
2.2.8.3
Lubrication
The arrangement and details for lubrication shall be as shown. Before
erection or assembly all bearing surfaces shall be thoroughly cleaned and
lubricated with an approved lubricant.
SECTION 05055A
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