Evolution 8 Relay Water Flashcards
The Officer or ECC of the operating pumper (normally 1st due pumper), upon finding no viable water source transmits signal 10-70 via what 2 means?
3.1
Department radio and HT and decides on
optimum position of the pumper, factoring such things as easiest hose stretch, ladder company accessibility, fire conditions, collapse potential, etc.
The next arriving pumper, designated as the Water Resource Unit, upon hearing signal 10-70 must do what?
3.2
Find a viable water source.
If water relay is necessary, what 2 hydranyt connections can be used to connect the supply pumper to the hydrant?
3.3
If water relay is necessary, the 10’ or 35’ hydrant connection is connected from a hydrant to the Supply Pumper.
The necessary lengths of 3½” hose are stretched from a 3” outlet of the Supply Pumper to the Operating Pumper’s 3” _____ _____ on the pump
panel side of the pumper.
Fill in the blanks
3.3
gated inlet
Both the Supply Pumper and the Operating Pumper must remain in the Volume Position. What is the exception to this?
3.4 Exception:
At Standpipe operations where head pressure needs to be overcome, the Supply Pumper remains in the Volume position and the operating pumper must be in the Pressure position.
.
The ECC of the Supply Pumper opens the hydrant fully, engages the pumps, primes, and then sets the reading on the Pro-Pressure Governor to match the idle pressure shown on the Pump Pressure Gauge. The pressure on the pump pressure gauge will be equal to the intake pressure from the hydrant plus the pressure the pumps idle at in the Volume position (about __ psi) or in pressure position (___ psi). In most circumstances with the apparatus in the Volume position, this number will be between ___ – ___ psi.
Fill int the blanks
3.5
55
110
100-125
The Supply Pumper ECC communicates to the Operating Pumper ECC that they are ready to send water, upon confirmation how far should he open the 3” discharge gate?
3.6
Opens the 3” discharge gate fully.
The Operating Pumpers ECC leaves the gated inlet closed while opening the drain to the gated inlet, thus allowing air in the 3½” supply line to exhaust. He shall close the drain when what is observed?
3.7
When good water flow is observed flowing through the drain, close drain.
The ECC of the Operating Pumper should then slowly open the 3” inlet gate fully and note the Intake Pressure gauge reading. It should read from approximately 100–125 psi. The ECC should then prime the pump and note the reading on the Pump
Pressure Gauge. Why will this reading be 50-60 psi greater than the intake gauge reading?
3.8
50-60 psi greater than the Intake gauge reading due to the added pressure from his pumper at idle in the Volume position.
The idle pressure on the pump pressure gauge will be equal to the intake pressure from the relay plus the pressure the apparatus idles at in volume (55 psi). In most circumstances during a relay, with both apparatus in the volume position, this number will be around how much psi?
3.9 Note:
150 – 175 psi (intake from relay approximately 100 psi plus volume psi 55).
The above relay procedure should accommodate two-2½” handlines without intake pressure gauge dropping below 15 psi on the operating pumper. If the Intake pressure gauge reading does drop below 15 psi on the Operating Pumper, then the ECC of the Operating pumper should request the Supply Pumper to increase throttle (tap-up propressure
governor) in __ psi increments as needed.
Fill in the blank
3.12
10
If the Supply Pumper’s Intake pressure gauge drops below 15 psi, the Supply Pumper ECC should contact what members and inform them of what?
3.13
The Operating Pumper ECC and the Incident Commander and inform them that the hydrants supply limit has been reached.
If time permits what should be attached to the
2 1/2” outlet of the hydrant?
Notes: 1.
Time permitting, a 2½” gate should be attached to the hydrants 2½” outlet for possible augmentation if necessary.
On some hydrants with high pressures (e.g., parts of Staten Island) the Intake pressure reading on the Operating Pumper may reach or exceed 150 psi, even if the SupplyPumper is in the Volume position. If the Operating Pumper ECC notes the intakepressure is greater than 150 psi or the automatic intake relief valve discharges (this
should happen when the inlet pressure reaches 150-175 psi), he/she should communicate
with the Supply Pumper ECC to insure he/she is in what position?
Notes 4.
The Volume position.
What is the major factor in a relay operation?
Notes 7.
The capacity of a hydrant is a major factor in Relay Operations. The capacity of a hydrant is based on many variables - size of main, location within the system etc. It is important for units to know the capabilities and limitations of hydrants in their response area.
