Elkhart Brass FLX-20G - Manual (Page 5)

5
III. F
LEX
A
TTACK
®
O
PERATION
A. Discharge Adjustment
The discharge size of the nozzle can be adjusted by simply rotating the tip of the nozzle. The
adjustment of the discharge size can be accomplished without shutting the nozzle down.
Rotating the tip to the right (clockwise) will achieve the smallest discharge diameter. Rotating
the tip to the left (counterclockwise) will achieve the largest discharge diameter. A detent has
been utilized to indicate each discharge position.
B. Discharge Settings
The discharge sizes of the nozzle have been chosen to provide convenient settings for flowing
water, wet CAF, and dry CAF. The different nozzle settings only control the discharge sizes of
the nozzle. Any changes to the proportioning rates of the CAF (foam solution to air ratio) must
be adjusted at the pump panel as it would with any other nozzle. It should be noted that the
discharge setting labels are merely a recommendation. CAF can be flowed through the nozzle
in any of the three discharge settings. The flow rates of CAF through each setting will depend
on several different variables such as the water, foam, and air proportioning rates. Each
department should test the nozzle to determine which setting is suitable for each particular
application.
Important:
Each end user should become thoroughly familiar with the hydraulic characteristics of this equipment,
and the pumping system used to supply it. Personnel must be properly trained in all aspects of the
nozzle in order to produce effective fire fighting streams.
C. Water Setting
The water setting represents the smallest discharge setting of the nozzle. The discharge
diameter in this setting is 15/16”. The size of this setting was primarily chosen such that it is
possible for the user to switch from CAF to a water only stream and still maintain a usable
water stream. The size provides the user a very effective means for switching to water without
shutting down the nozzle and switching tips. The flow and reaction force characteristics of the
nozzle in this setting are comparable to a typical 15/16” smooth bore tip. The water flow rate
of the Flex Attack
®
in this setting is 184 GPM at 50 psi. As previously stated the CAF flow
rates will depend upon pump panel settings, but will exhibit the similar characteristics of a
15/16” smooth bore tip. Each department should thoroughly test the nozzle to determine the
characteristics based on their foam system.