3.1.20
Warning and Identification Tape
Coordinate installation of utility warning and identification tape with
backfill operation. Provide tape above buried lines at a depth of 200 to
305 mm 8 to 12 inches below finish grade.
3.2
CLEANING AND CLEANNESS REQUIREMENTS
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NOTE: Special cleaning requirements are mainly
intended for high pressure systems. Special
cleaning should also be considered for medium
pressure systems over 1724 kPa (gage) 250 psig which
may be subject to dieseling explosions when oil
contamination is present. Objective cleaning
standards are specified to simplify inspection and
acceptance in the field.
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Cleaning and cleanness requirements shall conform to ASTM A 380 and the
following.
3.2.1
Substitution
The word "shall" shall be substituted for "should" in ASTM A 380.
3.2.2
Prohibited Methods and Processes
The following methods and processes shall not be used.
a.
Chemical descaling (acid pickling).
b.
Abrasive blasting and vapor blasting.
c.
Alkaline cleaning.
d.
Emulsion cleaning.
e.
Chelate cleaning.
f.
Acid cleaning
g.
Passivation.
h.
Corrosion inhibitors shall not be used.
3.2.3
Approval of Methods and Procedures
Prepare and submit written cleaning procedures for approval.
Perform
production cleaning in accordance with approved procedures.
3.2.4
Tools Used on Corrosion-Resistant Alloys
Tools used on corrosion-resistant alloys such as grinding, polishing,
filing, deburring, and brushing tools shall be visually clean and shall not
have been used on carbon or low alloy steels, aluminum, lead or materials
containing lead or lead components, or other low melting point materials.
Wire brushes shall be 300 series stainless steel. Unless otherwise
approved, each tool shall be used on only one type of corrosion-resistant
SECTION 15212N
Page 42
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