MIL-STD-1622B(SH)
excluding accidents or spills (see 6.4). If excessive solvent concentration will be present, approved respirators shall be worn (see 6.4). If necessary, use portable blowers. Exhaust ventilation is preferable to blowing air into the space. Solvent vapor should be captured as close as possible to the point of generation and discharged outside of the area in a manner that precludes recirculation and exposure to other personnel.
(b)At least two people shall be present at all times while solvent is being used. Do not leave the area unattended while cleaning is in progress.
(c)When a halogenated solvent is being transferred by hose or pipe
from a remote location, communication shall be established between
the pumping station and the space involved.
(d)To permit escape in the event of an accidental spill, a self-
contained breathing device shall be immediately available to each
person in any space where operations involving a halogenated
solvent are taking place or occupied spaces where leaks may occur
while systems containing halogenated solvents are being cleaned,
tested, serviced, or repaired. Each person shall have received
instruction and practice in the use of the particular self-
contained breathing device to be used. When a spill occurs, a
high concentration of solvent vapor may rapidly fill the space and
dilute the air in the space. Breathing this diluted, contaminated
air can result in rapid (10 to 15 seconds) loss of consciousness
caused by oxygen being washed from the lungs. It is therefore
necessary to stop breathing until the self-contained breathing
device has been put on and is supplying air. The Navy "Emergency
Escape Breathing Device" (EEBD) may be used for emergency escape.
(e)All hot work in the space shall be suspended before introducing the
solvent into the system. An exception is that during overhaul in
a shipyard, hot work may be performed on board a ship while
systems are being flushed (not pressure tested) with halogenated
solvents if each operation is authorized by a gas free engineer.
Personnel shall be instructed to leave the area immediately if
anyone experiences any irritation of the eyes, nose or throat.
During specially authorized hot work, self-contained breathing
devices for emergency escape are not required in spaces where all
lines being flushed contain only welded joints (no flanges, valves
or other fittings having mechanical joints). The following
warning sign shall also be displayed at the entrance to all work
spaces:
WARNING:
HALOGENATED SOLVENT OPERATION; DO NOT ENTER UNOCCUPIED SPACE WITHOUT FIRST TESTING FOR SOLVENT; NO HOT WORK OR OPEN FLAMES ALLOWED IN THIS SPACE EXCEPT WHEN AUTHORIZED BY A GAS FREE ENGINEER; LEAVE SPACE IMMEDIATELY IF ANYONE NOTICES ANY EYE, NOSE OR THROAT IRRITATION.
(f)Carefully check the system for leaks before pumping solvent through the system (see 5.7.3.2).
(g)Chemical safety goggles or a full-length face shield shall be used where eye contact is possible. A full-length face shield shall be worn over chemical safety goggles for any operation where
splashing of the solvent may be a problem. In the event of eye contact, personnel should flush the eyes with fresh water for a minimum of 15 minutes, then seek prompt medical attention. An eye wash system conforming to the design requirements of the American National Standards Institute (ANSI) Z358.1 shall be in the
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