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Fuels Vol. 3 Unit 3

Type 3 Hydrant System

QuestionAnswer
Name the four functions of the 40–27G filter separator control valve. (418) Flow control, water slug shut-off, maximum differential pressure shut-off and check valve
What happens to the 40–27G FSCV when the differential pressure across the filter separator increases to 15 psi? (418) The 40–27G closes
Where is a 40–28G bypass valve installed in a Type III system? (418) Only on systems that receive fuel directly from a cross-country pipeline
Where is the 40–28G BPV located? (418) On a bypass line between the two receiving F/Ss
What component on the 40–28G bypass valve sends an audible alarm to the PCP to indicate the bypass valve is open? (418) The limit switch.
What receiving meter component on the PCP is activated when a gallon of fuel is received? (418) An electronic digital counter
How do you install the master meter to calibrate the receiving meter? (418) By closing the manual valve and connecting the meter to the proving connections
What type of pipe is used to carry fuel from bulk storage to the issue filter separator in a Type III system if the pipe is 12 inches in diameter? (417) Carbon steel, ASTM A53, grade B.
Why does the hydrant loop of a Type III system use stainless steel piping? (417) It is less susceptible to rust and ensures the quality of the fuel delivered to the aircraft.
The pressure relief and drain system of a Type III system uses what type of piping? (417) Carbon steel, Schedule 40, API 5L, Grade B or ASTM A53, Grade B.
When can on-base bulk storage tanks be used as the operating tanks for a Type III hydrant system? (419) If they are suitable, located within one mile of the fueling apron and modified to meet the criteria in Standard Design AW 78–24–27.
What type reading do you get from the tank level indicators? (419) Local and remote fuel level readings
What happens when an operator acknowledges the alert condition of the High-High Level Alarm on the 413AF–5A high level valve? (419) The PCP is steady and the horn turns off
What type of manual valve is the operating storage tank outlet valve? (419) A 12-inch, non-lubricated double block and bleed valve
What product recovery tank components collect fuel and water from the system? (419) The pressure reliefs, strainer drains, F/S automatic water drains, low/high point drains, and the operating storage tanks water draw-off system
What size and type of tank does the product recovery system use? (419) A 4,000-gallon, double wall, steel tank
What types of leak detection monitors can be used on the product recovery system? (419) Vacuum maintenance, positive air pressure maintenance, hydrostatic pressure maintenance, or probe detection
What type of pump is used to remove water from the product recovery tank? (419) A hand operated pump with a double-action piston that delivers liquid on every forward and backward stroke
How many manifolds are in the issue pipeline? (420) 3 manifolds
What types of pumps are used as fueling pumps? What is their rated capacity? (420) must meet API 610 requirements and must be single-stage centrifugal, horizontal mounted, vertical or radial split case, enclosed impeller, with end suction and top vertical discharge. Their capacity is 600 gpm when driven at 3,600 rpm
How are the fueling pumps connected to the hard pipe? (420) By flexible metal hoses.
What type of mechanical seal is used on the fueling pumps? (420) Single unbalanced, multiple-spring type
What is the sight glass on the fueling pumps bearing housing used for? (420) To check the oil level
How are fueling pump and motor shafts coupled together? (420) With a flexible and self-aligning coupling
Where are flow switches located? What are they used for? (420) Immediately downstream of the fueling pumps’ discharge line. To lock the fueling pumps on after they are called on by the microprocessor and to notify the microprocessor that the pump is pumping fuel.
What flow rate must be set on the 41AF–1A non-surge check valve’s flow controller? (420) 600 gpm
How are the issue filter separators connected? (420) In parallel and manifold at the inlet and the outlet by 12-inch manifolds
What feature was added to the 40AF–2C to make it the 41AF–2C? (420) Two hytrol check valves were added to prevent reverse flow through the F/S
The venturi tube operates on the same principle as an orifice plate with one exception. What is the exception? (420) The venturi tube is much more accurate
Where is the return venturi located? (420) Upstream of the 58AF–9 valve in the hydrant loop return line
At what two system pressures does the PIT send a signal to the microprocessor? What results from each signal? (420) Below 60 psi and at 175 psi
How many differential pressure transmitters (DPT) are there on the issue venturi of a 2,400 gpm Type III system? (420) two
What flow range can you read on the low-range DPT? (420) 0-100 gpm
What flow range can you read on the high-range DPT? (420) 0-800 gpm
What five points must you calibrate on an issue DPT? (420) 0 gpm, 600 gpm, 1200 gpm, 1800 gpm, 2400 gpm
What three points must you calibrate on the return venturi’s high-range DPT? (420) 0 gpm, 560 gpm, 700 gpm
What should the loop pressure be if the Type III hydrant system is idling? (421) 75 psi
How much pull does it take to open the hydrant pit cover? How much push does it take to close it? (421) 30 lbs of pull to open it, and 50 lbs of push to close it
What is used to seal the fuel issue pipe at the floor of the hydrant pit? (421) Buna-N boot
How much pressure at the skin of the aircraft is the CRA on the 362AF–8 set to maintain? (421) 45 psi for any flow rate from 50 to 600 gpm, or 50 to 1,200 gpm, depending on the system design
At what pressure set point does the CRL on the 362AF–8 closes rapidly? (421) 50 psi
What valve has an air sense pressure of 65 psi, on the R-12, which causes excess nozzle pressure to be relieved at 55 psi? (421) Brooks valve
What happens if a deadman hose ruptures? (421) main valve closes in a maximum of 5 seconds
The backpressure control valve (BPCV) opens when the loop reaches what pressure at the farthest hydrant outlet? (421) 100 psi
How many seconds should the 58AF–9 BPCV take to close? (421) 3 seconds
The pressure control valve (PCV) is capable of what flow rate under normal operating conditions? (421) 50 gpm
What is the pressure relief setting on the 58AF–3 PCV? How long does the valve take to close? (421) 75 psi, 3 seconds
What position should the 58AF–9–1 D/FV be in during refueling? (421) deenergized, closed b/c it will not open anytime a fueling pump is energized
What happens to the 58AF–9–1 D/FV when all the refueling pumps stop? (421) Solenoid “A” energizes allowing the valve to open and remain open until the loop pressure drops to 80 psi
How is the pressure developed to open the 58AF–9–1 D/FV for defueling? (421) by a defuel pump on the R-12 HSV
What rate does the 58AF–9–1 D/FV allow fuel to circulate during system flushing? What determines the flow rate? (421) From 600 to 2,400 gpm. The number of fueling pumps used determines the flow rate.
What is the size of the return venturi tube? (421) 4 inches in diameter
How many single point receptacles (SPRs) are there on the R-12 checkout stand? (421) 4 SPRs
What are the two overhead single point receptacles used for? (421) To test the straight throat nozzles, and to check the hydraulic lift provide with the R-12 when using these nozzles
Where is probably the first place you would go when your are told the system is not working properly in the Type III hydrant system? (422) Type III control room
What color lines are on the graphic display? (422) Green, yellow and blue
How can you tell which fueling pumps are operating if you are in the pump control room? (422) By looking at the graphic display panel
What problems are indicated by the resonating horn sound? (422) An emergency stop, low-level operating tanks on #1 or #2 (if the outlet valve is not fully closed), high-high level operating tanks #1 or #2
What are the two speeds of the pressure/flow recorder’s motor? (422) 1 inch per hour or 8 inches per hour
What is the pump starting sequence if fueling pump 3 is the lead pump? (422) #8 3, 4, 1, 2
Why should the lead pump designation be changed periodically? (423) So all pumps have approximately the same amount of running time
What components sense the pressure just downstream of the 136AF–9B emergency shut-off valve? (423) PITs 1 and 2
At what pressure does the 58AF–9 BPCV modulate open to maintain the system pressure? (423) 100 psi
What 58AF–3 PCV component keeps the valve closed when the fuel pumps are running? (423) the solenoid
How many solenoids are on the 58AF–9–1 D/FV? (423) two; solenoids A and B
At what hydrant loop pressure does the PIT signal the microprocessor to call off the lead pump? (423) Once the hydrant loop pressure reaches 175 psi, PIT–1 or PIT–2 signals the microprocessor to call off the lead pump.
What happens to excess pressure from thermal expansion? (423) bleeds back into the operating storage tank
What connects the system to the aircraft to be refueled? (424) The HSV (R-12) coupler is connected to the 364AF–2, API adapter, and one of the R-12’s single point nozzles is connected to the aircraft to be refueled
When the lead pump is running, what flow rate is sensed through the return venturi to call on the second pump? (424) 40 gpm or less
What two conditions require more than one pump to run at the same time? (424) When an aircraft being serviced receives fuel at a rate exceeding 560 gpm or when more than one aircraft is being refueled at a time
How many pumps are running if the issue venturi senses 1,800 gpm and the return venturi senses 50 gpm? (424) Three, because the return venturi must flow greater than 700 gpm to shut the third one off
In what modes can the system be used to defuel? (425) The idle or refueling modes
Where is the defuel pump on the Type III system? (425) on the R-12
Defueling in the idling mode causes fuel pumped by the R-12 to pass through which valve(s)? (425) 58AF–3 and 58AF–9-1
If you are defueling one aircraft while another aircraft is being refueled, where does the (defueled) fuel go? (425) Into the hydrant loop and once it gets in the loop the fuel either goes to other aircraft connected to the system that are being refueled, or to the 58AF–9 BPCV and into the operating tanks
What is the purpose of the flush mode? (426) to clean the loop system
What happens to the fuel when it is flushed through the system? (426) It is flushed through the apron loop and routed back into the operating storage tanks
(417) What type piping, 12 inches in diameter, is used in the hydrant loop of a Type III system? Stainless steel, Schedule 20S
(417) What type steel is used in the control tubing of the Type III system? seamless stainless
(418) At what differential pressure must the receiving strainer in the Type III system be cleaned? 10 psid
(418) What is the standard American Petroleum Institute (API) rate and gallons per minute (gpm) of receiving filter separators used in the Type III system? API 1581, 600 gpm
(418) The 40–28G bypass valve opens and fuel bypasses the receiving separators when fuel is received from a cross-country pipeline on the Type III system. The differential pressure causing this action occurs when 15 psid sensed across receiving F/S
(418) Once the 40–27G filter separator valve has closed due to high differential pressure, what must be done to get the valve to operate again? Manually reset the CDHS–3A
(418) A gallons per minute displacement meter is used in the receiving line of a Type III system. Which type does it use? 1200 gpm positive displacement meter
(419) Where is the ball float for the 413AF–5A high-level shut-off valve on an operating storage tank located? On the exterior side of the tank at the required shut-off height
(419) The 413AF–5A high-level shut-off valve’s closing feature and rotary disc assembly can be tested without filling the tank up with fuel to the high level shut-off point by using a manual tester on the high-level shut-off float assembly
(419) A Type III operating storage tank level indicator servo compartment must be approved for hazardous locations and listed for use in Class I Division 1, Group D
(419) When fuel reaches the high level alarm setting on a Type III operating storage tank, one warning is given by the High-Level Alarm window on the pump control panel (PCP). How do you see and hear the warning? PCP flashes and a vibrating horn sounds
(419) When fuel reaches the high-high level alarm setting, the High-High Level Alarm window on the pump control panel (PCP) is activated on a Type III operating storage tank. How do you see and hear the warnings? PCP flashes and a resonating horn sounds
(419) What size piping is used to connect the pressure reliefs and other drains to the product recovery tank in a Type III system? 2-inch
(419) The switch assembly automatically energizes the fuel transfer pump, on the product recovery tank in a Type III system, when the tank is 70 percent full
(419) At what full percentage does the overfill valve close in the product recovery tank in the Type III system? 80 percent full
(419) How is excess pressure relieved on the 2129AF overfill valve using the product recovery piping system in the Type III system? pressure relief control opens and allows the excess pressure to bleed around the overfill valve
(420) What size suction header is used in the Type III system? 16 inch
(420) Defining the temperature rating for motors used with the fueling pumps in the Type III system is the responsibility of the National Fire Protection Agency (NFPA) 70
(420) Each issue filter separator in the Type III system is rated for how many gallons per minute? 600 gpm
(420) When the two solenoids on the 136AF–9B emergency shut-off valve are energized, what happens to the valve? it closes only
(420) Where is the issue venturi tube located on the Type III system? located downstream of the 136AF–9B valve
(420) What mill ampere (mA) signal does the issue differential pressure transmitter send when 1,200 gallons per minute flows through the issue venturi in the Type III system? 12 milliamperes
(421) The 362AF–8 hydrant control valve opens when an aircraft is refueling. It opens by using the pneumatic deadman
(421) At what pressure, in pounds per square inch, does the 58AF–9 back pressure control valve open to control the hydrant loop pressure? 100 psi at the farthest hydrant outlet
(421) At what pounds per square inch does the 58AF–3 pressure control valve close? 75 psi
(421) After refueling an aircraft and the lead pump deenergizes, at what pounds per square inch (psi) does the 58AF–9–1 defuel/flush valve close? 80 psi
(421) Solenoid “B” on the 58AF–9–1 defuel/flush valve energizes to allow the main valve to open only when the system is placed in the flush mode
(422) What do blue lines represent on the Type III pump control panel line drawing? pump discharge and hydrant loop
(422) How long will the back-up battery maintain the Type III microprocessor’s memory? minimum of 30 days
(422) What does the first symbol in a rung of ladder logic represent? contacts
(423) To set up the pump control panel for fueling on the Type III system, after selecting the lead pump, you then place the system in automatic, and push the SYSTEM START button
(424) What happens to the lead, second, third and fourth pumps when the issue venturi senses 2,400 gpm and the return venturi senses 1,000 gpm for 15 seconds? fourth fueling pump is called off
(424) What happens if the third pump is called on automatically in a Type III system and fails to start? The next pump in the predetermined sequence is called on
(425) What component houses the defuel pump for the Type III system? The hydrant servicing vehicle
(426) The Type III system must be flushed when it is not used in 30 days
(426) To flush a Type III system, you must turn the selector switch on the pump control panel to “flush” and all available pump switches to “hand.”
Created by: Scottydick