TM 55-1930-209-14&P-17
o.
On regulator, open main line valve all the way.
p.
Make final test of entire system by breathing normally. Regulator should provide air in response to normal
breathing pattern.
4-12.2 Using SCBA
a.
Breathe normally through the nose. Regulator responds by adjusting airflow to user's need. If heavy exertion
prompts heavier breathing, regulator adjusts accordingly. However, heavier breathing uses more of the
compressed air in the cylinder and shortens the time that dean air can be provided.
b.
Before entering the toxic area, know which size SCBA is being used and how much time is available on the
cylinder. Plan work accordingly.
c.
When the low pressure warning bell sounds, immediately leave the toxic area and go to an area known to have
clean air.
4-12.3 Removing SCBA
a.
Make sure area provides clean air; no toxic gases present.
b.
Close cylinder valve on backpack.
c.
Remove breathing tube from regulator by unscrewing knurled knob and pulling tube from regulator opening. Air
system vents itself automatically.
d.
Close main line (yellow) valve by turning knob until it stops.
e.
Push thumbs under headband straps on each side and pull out to loosen straps.
f.
Hold facepiece by bottom assembly and swing out, up, and over the head.
g.
Release chest strap.
h.
Release waist belt-buckle.
i.
Slip one arm out of shoulder strap and swing SCBA off the back. Place SCBA flat on hard surface, being careful
not to damage valve assembly and gauge or regulator and gauge.
j.
For after-use maintenance, see Inspection after each use on page 4, MSA Inspection and Maintenance
Procedures in Appendix B.
4-13 Portable firefighting pump, PE-250. See Chapter 2, NAVSEA S6225 PE-250 manual.
4-14 Recovery from fire. To reduce operational time lost due to fire, recovery is as important as extinguishing the fire.
Recovery includes cleaning damaged area of toxic material, fumes and smoke; removing fire extinguishing chemical
residue; cleaning damaged equipment and/or material; repairing or replacing any damaged equipment; replacing used
extinguishers and cylinders; and reactivating all extinguishing systems.
a.
For general fires, clean the air in the affected area of toxic material, smoke, and fumes. If all ventilation systems
were turned off, and they remain operational, turn on ventilation systems immediately. Open doors and hatches
to maximize ventilation.
NOTE
If a fire occured in void 4, a Halon system pressure switch automatically turned off
the ventilation system. Reset the pressure switch so ventilation system can
operate. Refer to operation of Halon system, paragraph 4-8.
b.
For a fire in Void 4, turn on void 4 ventilation system for at least 15 minutes before entering the burned area
without protective breathing apparatus.
c.
If area must be entered immediately, wear appropriate protective clothing and use a self-contained breathing
apparatus. DO NOT use a filter type or canister mask.
4-25
