Trident Emergency Products, LLC
2940 Turnpike Drive | Suite #9 | Hatboro, PA USA
215-293-0700 Fax: 215-293-0701
© 2017 Trident Emergency Products, LLC. All rights reserved.
We design and manufacture advanced versions of
the typical plumbing and hardware products so you
receive improved function, easier installation, longer
service life, and lower costs.
For example, our UL-listed
Foam Pumps for fixed or
mobile foam systems
are self-priming, pump any
viscosity foam or water,
and contain two timing gears that synchronize the
pumping rotors—so rotors never contact each
other—eliminating rotor wear and allowing dry running without damage. Suitable for electric, diesel, P TO
or hydraulic drives. Seven models; capacities from 30
to 500 GPM.
E-Commerce Website... TridentDirect.com
Visit our website to buy online and for in-depth information on all our products including...AirPrime™ Air-Pow-ered Pump Primers—with easy retrofit; AirMax™
Intake Relief Valves; FOAMATE™ ATP Class A and B
Foam Proportioners...and more!
FOAM CONCENTRATE PUMP
Recreational Vehicle Fires
( 5) Typical engine setup for my department: The front line is a prepiped foam system that can flow
Class A or B foam. ( 6) The refrigerant tank (arrow) in an ammonia refrigeration system for a Class
A type RV, which was typical before residential-style refrigerators became the standard. ( 7) An
ammonia refrigerator system showing outside heat damage below the vent (arrow).
tion overall. My department engine setup and procedures have
provided us with this tactical advantage (photo 5).
Firefighting will include a combination of tactics and techniques used for vehicle, structural, gas, and hazmat incidents.
The RV’s wood frame, lightweight construction, and open
design allow the fire to travel quickly and to create a very hot,
Gas Fuel Cylinders
Such fires become even more treacherous when they involve
the onboard liquid petroleum gas (LPG) cylinder. I have seen
numerous videos of fires involving these vehicles in which the
LPG cylinder is venting prior to the fire department’s arrival.
roar of the LPG
can be extremely distracting to
firefighters as they exit the apparatus. But there is no time to be
mesmerized by the situation. This fire needs to be cooled down
quickly and from safe angles to protect the crew.
Knockdown: It’s Not Over Yet
Once the fire has been extinguished and the immediate
hazards have been mitigated, the next concern is overhaul.
Remember that most of these vehicles carry waste and other
hazardous materials. During overhaul, operators must have a
high index of suspicion that tanks designed to hold hazardous
materials may be damaged and leaking. In addition to tanks
containing fuel, LPG, and sewage, the RV may also (depending
on the refrigerator system type) have an ammonia unit.
In RVs, the refrigeration units may use sodium chromate mixed
with ammonia, hydrogen, and water instead of the Freon used in
the typical residential refrigerator. The LPG- or electric-powered
units cool through a condenser (photo 6) that operates from the top
down. The sodium/ammonia and hydrogen gas mixture is heated
by an electric element when the unit is hooked up to shore power at
the park or by LPG while the unit is on the road. When the mixture
is heated, almost like a coffee percolator, the chemical reaction
sends the cold gas to the top of the unit and starts its cooling action,
ending back down at the bottom of the unit to repeat the process.
RV refrigerators are among the most common appliances to
catch fire and among the leading causes of RV fires. Recalls were
issued for some refrigeration systems because the absorber units
were causing fires in the walls of the RV. This led to some interesting fires, showing the typical blue/green flames when the ammonia became involved. The other scenario that leads to fires is
a lack of maintenance. RVs are designed to travel great distances
at a time and, consequently, they need a great deal of preventive
maintenance. The combination of a lack of maintenance and
long periods of nonuse can lead to mechanical overheating or
wear items freezing. Photo 7 shows an RV in which the heat from
the ammonia refrigeration system damaged the side of the RV
(arrow). If the refrigeration system is not maintained and checked
for leaks, this could lead to a fire.