1.5.3.2
Flame-Spray Equipment
Flame-spray equipment shall be maintained and operated according to the
manufacturer's instructions. Metallizing operators shall be fully trained
in and familiar with specific equipment before starting an operation.
Valves shall be properly sealed and lubricated. Friction lighters, pilot
light, or arc ignition methods of lighting flame-spray guns shall be used.
If a gun backfires, it shall be extinguished as soon as possible.
Re-ignition of a gun that has backfired or blown out shall not be attempted
until the cause of the trouble has been determined. Flame-spray guns or
hoses shall not be hung on regulators or cylinder valves. Gas pressure
shall be released from the hoses after equipment is shut down or when
equipment will be left unattended. The pressure release sequence is as
follows:
a.
Close gun valves.
b.
Close cylinder valve.
c.
Open gun valves.
d.
Turn regulator screw out until free.
e.
Close gun valves.
f.
Close tank valve or manifold valve ahead of regulator.
Oil shall not be allowed to enter the gas mixing chambers when cleaning
flame-spray guns. Only special oxidation-resistant lubricants shall be
used on valves or other parts of flame-spray guns that are in contact with
oxygen or fuel gases.
1.5.3.3
Arc-Spray Equipment
Arc-spray equipment shall be maintained and operated according to the
manufacturer's instructions. Metallizing operators shall be fully trained
in and familiar with specific equipment before starting an operation. The
Contractor shall comply with the requirements in Section 14.C of EM 385-1-1.
1.5.4
Cleaning With Compressed Air
Cleaning with compressed air shall be in accordance with Section 20.B.5 of
EM 385-1-1 and personnel shall be protected as specified in 29 CFR 1910,
Part 139.
1.5.5
Cleaning With Solvents
Ventilation shall be provided where required by 29 CFR 1910, Part 146 or
where the concentration of solvent vapors exceeds 10 percent of the Lower
Explosive Limit (LEL). Ventilation shall be in accordance with 29 CFR 1910,
Part 94, paragraph (c)(5). Sources of ignition shall not be permitted in
the vicinity of solvent cleaning if there is any indication of combustible
gas or vapor present. Special precautions shall be taken when metallizing
materials that have been cleaned with hydrocarbon solvents. Specific
measurements shall be made to ensure that such solvent vapors are not
present during metallizing operations, especially in confined spaces. The
Contractor shall submit Confined Space Procedures as specified in the
Submittals paragraph and including requirements for toxic materials and air
sampling in confined spaces, as specified below. Representative air
SECTION 09971A
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