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Fuels Vol. 3 Unit 2
Type 2 Hydrant System
| Question | Answer |
|---|---|
| How many automatic valves are located in the LCP of the Pritchard system? (407) | 4 |
| At a hydrant outlet, what is used to start the pumps in the pumphouse and energize the solenoid on the refueling control valve in the LCP? (407) | Refueling contacts of the magnetic control station (KISS switch) |
| During refueling, which refueling valve does the fuel have to pass through to reach the hydrant outlet? (407) | 90AF-8 refueling control valve |
| What types of manual valves are used in the LCP? (407) | Non-lubricated plug or ball valves |
| Which of the four automatic valves in the LCP are used during defueling? (407) | The 134AF and the 41AF. |
| How can you isolate the defuel pump? (407) | By opening the defuel pump circuit breaker |
| What LCP component cuts off the defuel pump when the vacuum in the line between the defuel pump and the hydrant outlet reaches a predetermined setting? 407 | The vacuum control switch. |
| What type pump is used in the LCP for defueling? 407 | Self-priming, centrifugal. |
| What 5 functions does the 90AF–8 refueling control valve serve? 408 | Pressure reducing, nonsurge, pressure relief, excess flow shutoff, and emergency shutoff |
| On the 90AF-8 refueling control valve, what Throttles the valve, maintaining constant delivery pressure. 408 | pressure reducing control (CRD) |
| On the 90AF-8 refueling control valve, what Prevents downstream surges when fuel flow is suddenly stopped 408 | pressure relief control (CRL) |
| On the 90AF-8 refueling control valve, what Trips when an excessive flow condition exists 408 | CDHS-3 differential pressure control |
| On the 90AF-8 refueling control valve, what Provides a remote emergency shutoff 408 | solenoid |
| What should you inspect on the 90AF–8 every three months? 409 | Leaks, external damage, and the proper operation of its five functions |
| If the main valve on the 90AF-8 fails to open at the desired rate, what adjustment is needed? 409 | Adjust the CV flow control |
| What component opens the 50AF–2 valve very quickly and efficiently? 410 | Strainer orifice |
| Which component on the 50AF–2 valve allows the main valve to open once inlet pressure is exceeded? 410 | The CRL |
| What happens to the 50AF–2 valve if the CDHS–3 on the 90AF–8 valve trips due to pressure surges? 410 | It opens wide when pressure reaches 10 psi above the 90AF–8 valve’s NIP |
| Why is the 50AF–2 valve installed with the flow under the disc? 410 | So it opens even if the main valve diaphragm ruptures |
| What must you observe and record before adjusting the 50AF–2? 411 | The NIP of the 90Af–8 during refueling |
| Which manual valve must you close before adjusting the 50AF–2? 411 | The valve downstream from the 90AF–8 |
| Before starting the deepwell turbine pump, what must you do to the adjusting screw on the 50AF–2 CRL? 411 | Turn the adjusting screw clockwise for maximum spring tension |
| What is the standard for adjusting the 50AF–2 CRL? Who really has the final say to that adjustment setting? 411 | The standard setting is 10 psi above the 90AF–8 NIP. Your supervisor or trainer has the final say because each base differs |
| 134AF defuel control valve fails to open 412 | The solenoid does not energize; the main valve diaphragm fails; clogged control tubing; a closed manual valve downstream; or there is obstruction in the main valve body |
| 134AF defuel control valve fails to close 412 | Either the solenoid valve is stuck open or there is obstruction in the main valve |
| 134AF defuel control valve defuel pump rotating slowly during refueling 412 | There is either a fuel leakage through the solenoid valve or leakage past the main valve disc and seat |
| What are the two distinct functions of the 41AF rate-of-flow control valve? 413 | It holds the preset flow rate during defueling at 200 gpm and it acts as a check valve, by preventing fuel from flowing in reverse when the 50AF–2 opens during refueling |
| Which component, on the 41AF, maintains the defueling rate of flow through the defuel pump? 413 | CDHS–2,differential control |
| What is energized when you place a magnet on the magnetic defuel (KISS) switch? What flow rate is then established? 413 | The solenoid on the 134AF is energized and the defuel pump starts.. A 200-gpm flow rate is established |
| Which two components, on the 41AF, work together to prevent reverse fuel flow? 413 | The hytrol check and the swing check valves |
| How often is the 41AF rate of flow control valve inspected? 413 | Quarterly |
| What are the two functions of the 352AF adapter? 414 | Provides a quick, leak-free connection between the installed piping and portable hose equipment; and it controls its own fuel level when defueling to keep air out of the piping system |
| What coupler must be connected to the 352AF to open the adapter? 414 | The 351AF |
| What allows the float in the hydrant adapter to rise (lift off its seat) and stay open to allow fuel to flow? 414 | Buoyancy and velocity |
| What 352AF constructional feature allows pressure to equalize if the pressure above the float is greater than the pressure below the float? 414 | The automatic bypass valve |
| What happens if the defuel pump starts before the pressure on either side of the float is equalized? 414 | The float will be held tightly against its seat |
| When defueling stops, what feature of the 352AF prevents air from being drawn into the piping system? 414 | the float assembly |
| Which part(s) of the 352AF adapter must be removed to replace the disc? 414 | The cover, seat, and poppet |
| What component on the 352AF hydrant adapter makes sure jet fuel is not dispensed to a reciprocating, aviation-gasoline aircraft? | The stop, one for the jet fuel and the other for the AVGAS |
| What are the hydrant outlets grounded to? 414 | A galvanized or stainless steel ground rod |
| What valve was removed from the modified Pritchard LCP? 415 | The 134AF defueling control valve |
| component of 51AF-4 defuel valve that Prevents reverse flow through the control loop 415 | Hytrol check |
| component of 51AF-4 defuel valve that Holds the main valve closed during refueling operations 415 | Auxiliary hytrol, Three-port solenoid |
| component of 51AF-4 defuel valve that Closes to keep the hydrant line full of fuel 415 | Low-pressure CRL |
| component of 51AF-4 defuel valve that Relieves excess pressure to the defueling line 415 | High-pressure CRL |
| component of 51AF-4 defuel valve that Relieves pressure from the hytrol cover chamber 415 | Three-port solenoid |
| component of 51AF-4 defuel valve that Dumps pressure onto the main valve cover chamber during reverse flow 415 | Swing check valve |
| component of 51AF-4 defuel valve that Controls the main valve closing speed 415 | CV-flow control |
| component of 51AF-4 defuel valve that Opens at 5 psi 415 | Low-pressure CRL |
| What causes the 41AF-10 solenoid to deenergize closed? 415 | When the defuel pump in the pit is not energized |
| What component prevents fuel from flowing through the defuel pump during a rapid flow defueling operation? 415 | The solenoid, deenergized closed, on the 41AF–10 |
| To set the pressure on the 51AF-4 valve, what three components are adjusted? 416 | The two CRLs and the CV flow control |
| What is used to set the low-pressure CRL on the 51AF-4 rapid defuel valve? 416 | A magnet placed on the refueling KISS switch |
| What should the lateral piping pressure be when the system is idle if the low-pressure CRL on the 51AF-4 rapid defuel valve is set correctly? 416 | 5 psi |
| What pressure does the 51AF–4’s high-pressure CRL open if the 90AF–8 CRD is set to open at 105 psi? 416 | At normal operating pressure of 105 |
| If the 51AF-4 does not open to relieve fuel pressure surges during refueling, what component would you check? 416 | The high-pressure CRL to see if it is set too high or if there is a hole in the diaphragm. |
| What happens when the solenoid valve on the 51AF-4 fails to energize? 416 | The 51AF–4 bypasses fuel during fueling operation |
| (407) How many manual valves are found in the lateral control pit of the Pritchard system? | 3 |
| (407) When you place a magnet on the defuel magnetic control switch, during defueling, the solenoids on the | defueling control valve and the defuel pump are energized |
| (407) What lateral control pit component automatically cuts off the defuel pump when a predetermined amount of inches of mercury is reached? | vacuum control switch |
| (408) When the cover chamber pressure of the 90AF–8 refueling control valve is at least as great as the inlet pressure, the valve will | valve closes tightly |
| (408) If the cover chamber pressure on a 90AF–8 refueling control valve stays between the inlet and outlet pressure, the valve | valve modulates |
| (408) What happens to auxiliary hytrols A and B, on the 90AF–8 refueling control valve, when excess flow trips the CDHS–3 pressure differential control? | A opens and B closes |
| (408) The pressure relief control, on the 90AF–8 is set to | 5 psi above normal operating pressure (NOP) |
| (409) What pressure rate must you establish before setting the pressure relief control on the 90AF–8 refueling control valve? | 5 psi above the NOP |
| (410) Which statement best describes what is removed from the strainer orifice used on the 50AF–2 pressure relief valve? | only the primary jet |
| (411) How often should you check the 50AF–2 pressure relief valve to it is opening and relieving pressure? | semi-annually |
| (411) The standard pressure setting, on the 502AF–2 pressure valve’s pressure relief control (CRL), is based on the 90AF–8 refueling valve’s pressure of | 10 psi above its normal inlet pressure |
| (412) The components of the 134AF defueling control valve include: a valve position indicator, solenoid | flow clean strainer, ejector |
| (412) How often is the 134AF defueling control valve operationally inspected? | quarterly |
| (412) What condition exists when fuel leaks past the 134AF main valve disc and seat? | The defuel pump rotates slowly during refueling |
| (413) Which component on the 41AF rate-of-flow control valve causes the main valve to throttle? | CDHS–2 |
| (413) To adjust the flow rate of the differential control on the 41AF rate-of-flow control valve, you must turn the adjusting screws | turn counterclockwise until minimal spring tension |
| (413) What is the probable cause when the 41AF–10 main valve opens during refueling? | leakage through normally closed solenoid valve |
| (414) When defueling stops, the 352AF hydrant adapter controls its own fuel level in order to | keeps air from entering the installed piping system |
| (414) At what maximum differential pressure, in pounds per square inch (psi) does the 352AF hydrant adapter’s automatic bypass valve open? | maximum differential pressure of 35 psi |
| (414) After activating an emergency stop switch at the Type II hydrant outlet, you reset the system to refuel by | manual reset required in pumphouse control room |
| (415) How often is the 41AF–10 inspected? | semi-annually |
| (415) What are the low and high settings (pounds per square inch {psi}), respectively, for the pressure relief controls on the 51AF–4 valve? | 5 psi and 5 psi above the CRL on the 90AF–8 |
| (415) The primary purpose of having 5 psi in the lateral piping on the 51AF–4 rapid defuel valve is to | prevent reverse flow during rapid flow defueling |
| (416) Before adjusting the high pressure relief control on the 51AF–4 valve, you must also adjust the pressure reducing control (CRD) on the 90AF–8 valve to | 5 psi above the normal operating pressure |
Created by:
Scottydick
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