Transfilling Between Scbas - MSA G1 SCBA Operating Manual

NOTE: If the secondary air supply does not have a sufficient volume of air, the SCBA cylinder will not
reach full service pressure.
(4) Compare the readings of the cylinder pressure gauge and the remote pressure gauge to the
secondary air supply pressure gauge.
If the readings are the same, pressure is equal.
(7) Immediately install the rubber dust cap on the UAC fitting.
(8) If the needle on the cylinder pressure gauge is in the appropriate color band, the SCBA cylinder
is ready for service.

13.3 Transfilling between SCBAs

WARNING!
Do NOT try to transfill SCBA with a 5500 psi operating system.

Do NOT do transfilling between SCBAs if the donor's primary low-pressure warning device is in

alarm or the HUD/control module lights are flashing red.
Failure to obey this warning can result in a shorter escape time to return to fresh air, causing
serious personal injury or death.
Do transfilling between SCBAs ONLY during life-threatening emergencies or simulated training exer-
cises.
The SCBA with the higher pressure reading is the donor. The SCBA with the lower pressure reading
is the receiver. Both donor and receiver must return to fresh air immediately following the transfilling
procedure.
If the donor's primary low-pressure warning device goes into alarm or the HUD/control module lights
start to flash red during transfilling to indicate that pressure in the cylinder has been reduced to
35 percent of its rated working pressure, the donor should disconnect and use the remaining service
time to escape to fresh air.
If the donor's primary low-pressure warning device is not in alarm, the HUD/control module lights are
not flashing, and there is sufficient air to transfill to a receiver (more than 1000 psi for 2216 psi SCBAs
and more than 2000 psi for 4500 psi SCBAs), do the following:
(5) To disconnect the Quick-Fill hose, pull the gray sleeve
back.
The female fitting on the hose and the UAC fitting will sepa-
rate.
A hissing or popping sound may occur as the fittings sepa-
rate and the high-pressure air is sealed off.
(6) Listen for leaks from the UAC fitting.
G1 SCBA 2018 Edition
UAC Fitting
US
74