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Fuels Vol. 3 Unit 1
Type I Hydrant System
| Question | Answer |
|---|---|
| What control panels on the Type I system are important to you? (401) | Pump control panel and pump selector panel. |
| What panel is not found on the Type I system that is found in the other hydrant system and storage area pumphouses? (401) | A defuel pump control panel. |
| What causes a pump control panel circuit breaker to trip? (401) | When a short circuit occurs in the associated pump motor circuit or when the incoming power lines are overloaded. |
| What does the graphic display on the Type III pump control panel show? (401) | A single line mechanical diagram of the Type III system. |
| What is key to your day-to-day maintenance activities? (402) | Being able to trace the fuel system piping and locate the components in the system. |
| When troubleshooting a fuel system, you find the pump running with no fuel being delivered. What is your first stop in diagnosing the problem? (402) | Your first stop is the as-built (mechanical) drawing located on the wall of every fueling facility. |
| What is found in the lower right hand corner of mechanical drawings? (402) | The standard design drawing code and specification number. |
| What positions are on the pump control switch? (401) | HAND/OFF/AUTO |
| The pressure/flow recorder indicates which of the following? (401) | System pressure and issue/return flow rates |
| Most emergency service calls involve (402) | no fuel delivery |
| How many hydrant outlets are served by each Panero pit? (403) | 1 |
| The modified Panero system has 7 tanks. How many are used for refueling aircraft? (403) | 6 |
| What was removed and replaced in the hydrant pit and is now used on the hose cart? (403) | a new filter and meter |
| What, in the Type I filter/meter pit, was put in the defueling line to keep the entire line and meter from draining? (403) | a "U" bend |
| How many hydrant outlets are normally on each 302AF valve? (403) | one |
| Which automatic valve is located in the pit? (403) | 302AF, fueling/defueling valve |
| What component aids in opening the 302AF valve? (404) | ejector strainer |
| What prevents leakage around the 302AF valve ejector strainer’s primary jet? (404) | O-ring |
| During refueling, which component controls downstream pressure of the main valve? (404) | Pressure-reducing control (or CRD) valve |
| When operating normally, what part on the 302AF fueling/defueling valve restricts the flow of fuel in the control tubing and will not close? (404) | Pressure-reducing control valve |
| On the CRD, what indicates a damaged diaphragm? (404) | Fuel leakage from the vent port. |
| How many pressure-relief controls (CRLs) are on the 302AF valve and what are they called? (404) | Two, the Loading and Unloading Pressure Relief CRL. |
| Which CRL applies pressure to the top of the refueling cover chamber of the 302AF? (404) | The loading CRL. |
| What happens to the defueling side of the 302AF when the 4-port solenoid is deenergized? (404) | Does the opposite and opens. |
| What positions are the 302AF refueling and defueling valves normally spring-loaded? (404) | The refueling side is normally spring-loaded closed and the defueling side is normally spring-loaded open. |
| What component vents the cover chamber pressure of the hytrol valve to the defueling line? (404) | the solenoid |
| What component restricts flow through the ejector strainer and what impact does it have on the refueling side of the main valve? (404) | The CRD, through modulation, causes the refueling side’s main valve to eventually provide constant downstream pressure |
| Explain what happens if the downstream pressure builds to 10 psi above normal operating pressure (NOP). (404) | The unloading pressure-relief opens and relieves pressure on the defueling side; the defueling side opens and relieves pressure into the defuel line. |
| What happens at the 302AF valve when an excess flow condition exists? (404) | The excess flow creates low-pressure at the orifice plate, tripping the CDHS–3 and closing the refueling valve. |
| Which component on the 302AF valve must regulate the opening speed of the fuel valve and why is the component necessary? (404) | The CV flow control and it is important because it keeps the CDHS–3 from inadvertently tripping. |
| How does the 302AF refueling and defueling valve operate during defueling? (404) | The solenoid is deenergized during defueling and the line 1 common supply becomes part of line 3’s common supply and closes the hytrol valve. |
| A damaged diaphragm on the pressure reducing control is indicated by (404) | fuel leaking from the vent port |
| What component closes the main valve of the 302AF fueling/defueling valve when there is excess flow at the hydrant outlet? (404) | CDHS-3 |
| The primary purpose of the orifice plate on the 302AF fueling and defueling valve is to create differential (404) | pressure to operate the CDHS-3 |
| During refueling, which 302AF fueling and defueling valve component holds the defuel side of the main valve inlet closed? (404) | solenoid |
Created by:
Scottydick
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