Tools 7 Hose Nozzles (Hand Held)

Question 1

That section of the nozzle that contains the water control valve. It is identified by the letters?

Answer 1

2.2.1

SHUT-OFF=SO

Question 2

TIP - an attachment usually connected to a SO, or a hose butt; it performs the basic function of the nozzle and is designed in various forms. The characteristics of Solid Stream tips and nozzles are determined by tip design. The patterns and flows of fog stream tips and nozzles are determined by special designs. SOLID STREAM TIPS are generally _______.
Fill in the blank

Answer 2

2.2.2
Stacked
MAIN SOLID STREAM TIP (MST)- is fitted with threads at its outlet orifice, is the first tip of the stack, and is attached directly to a SO.
b- OUTER SOLID STREAM TIP (OST)- does not have outlet orifice threads, and is threaded at its inlet for attachment to a MST to further reduce bore diameter. The 1/2” tip is a OST.

Question 3

What are the most common types of fog tips?

Answer 3

2.2.2 B.
FOG TIPS are fog producing devices.
1. FOG TIP (FT), - the most common types have an outer rotating barrel which is used for stream adjustments and, in some models, as a shut-off.
2. Most FT’s are classified as Combination Straight stream/ Fog devices. The straight stream is hollow and the fog patterns depend on adjustments permitted by the Outer Rotating Barrel.

Question 4

Combination SS/Fog devices shall be placed in straight stream position (turned to the _____) at all times when stored on apparatus or in hose bed. This will avoid possible damage to the baffle.
Fill in the blank

Answer 4

3.4 A

right

Question 5

Particular attention must be given to the inlet orifice diameter of any of the solid stream tips to make certain it equals the outlet orifice diameter of the SO to which it is attached. If it is smaller and the lip of the inlet orifice projects as a sharp edge into the bore, the stream will be severely limited (coefficients of discharge may vary from normal .998 to .80 or worse). Units when discovering this condition, shall promptly forward the tip to whom?

Answer 5

3.4 C
Division of Repairs & Transportation to have the inlet orifice adjusted. Adjustment usually consists of chamfering (beveling) the lip to avoid a sharp projection into the waterway.

Question 6

What 2 times will controlling nozzles be tested durfing the calender year?

Answer 6

3.15
Controlling nozzles will be tested annually in August and whenever deemed necessary in
accordance with schedules established by Division Commanders as follows:
-Two lengths of hose (100’) shall be stretched from the pumper, nozzle attached, water started and sufficient pressure developed to attain an effective stream.
-Shut offs shall be opened and closed several times as in normal operating procedures, and nozzles operated (MST, OST, FT) throughout their various positions and pressures.
-Nozzles found defective shall be removed from service and forwarded to the Repairs and Transportation Unit for necessary repairs.