Elkhart Brass TFLX-20 - 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. One of the diameter labels may be
preferred for departments with different CAF operations or if the nozzle will be used as a
selectable orifice smooth bore always flowing water. CAF or water can be flowed through the
nozzle in any of the three discharge settings. Care should be taken to consider nozzle reaction
when flowing water at the higher 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 – 15/16 Inch – 24 mm Setting
The 15/16 inch/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 and yields 66 pounds of reaction force. 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.