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Fuels Vol. 3 Unit 4
Type 4 Hydrant System
| Question | Answer |
|---|---|
| What type piping is used from bulk storage to the issue filter separators if the piping is 16 inches? 427 | Internal, epoxy-coated carbon steel |
| What type piping is used from the issue filter separators, through the system loop, and back to the receiving loop if the piping is 12 inches? 427 | Seamless stainless steel, Schedule 10S |
| What type piping is used from the issue filter separators, through the system loop, and back to the receiving loop if the piping is 4 inches? 427 | Seamless stainless steel, Schedule 40 minimum |
| Why is stainless steel piping used in a Type IV system? 427 | Because it is less susceptible to rust and ensures the fuel quality being delivered to the aircraft. |
| What type piping is used for the pressure relief and drain system in a Type IV system? 427 | Epoxy-coated carbon steel, Schedule 40 |
| What are the primary methods of receiving fuel into a Type IV system? 428 | Pipelines or barges |
| What size and type receiving filter separators are used in the Type IV system? 428 | Two 600-gpm, horizontal, API 1581 filter separators |
| What valve is used as the receiving filter separator control valve? 428 | The 40–27G filter separator control valve (FSCV) |
| What valve is used as the high-level shut-off on a Type IV cut and cover tank? 429 | 129AF–3F |
| What component activates the high-level shut-off valve? Where is this component located on the Type IV cut and cover tank? 429 | A CFM2 float control. It is located inside the tank at the required shut-off height |
| What is the purpose of the manual valve installed in the control tubing of the Type IV high-level shut-off valve? 429 | To manually test the valve’s closing feature |
| How much control line pressure does it take to open the powertrol on a 129AF–3F? 429 | 5 psi |
| In what increments do the tank level indicators read on a Type IV tank? 429 | feet and tenths of a foot |
| What happens when the fuel level reaches the high-level alarm setting on a Type IV underground tank? 429 | The annunciator High Level Alarm window on the PCP flashes and a vibrating horn sounds |
| What happens when the fuel level reaches the high-high level alarm setting on a Type IV cut and cover tank? 429 | A resonating horn, a light external to the control room, and the window on the PCP marked high-high level alarm are all activated |
| What type pump is used to transfer fuel on a Type IV product recovery tank? Where is the fuel transferred? 429 | A 50-gpm, multi-stage, deep well turbine pump. It is transferred (returned) back through the receiving separators to the operating storage tanks |
| What type and capacity is the fueling pump used on a Type IV cut and cover tank? 430 | Deep well turbine pumps rated at 600 gpm when driven at 3,600 rpm |
| What type and capacity is the fueling pump used on a Type IV cone roof with floating pan tank? 430 | API 610, with a horizontal centrifugal, rated at 600 gpm when driven at 3,600 rpm |
| What is the primary purpose of the 41 AF–1A valve? 430 | To lock the fueling pumps on after they have started. |
| What valve is used as the Type IV issuing filter separator control valve? 430 | The 41AF–2C |
| What happens to the emergency shut-off valve when there is system power loss or an emergency shut-off switch is engaged? 430 | It is directed to the main valve cover chamber, closing the valve |
| Where is the issue venturi located? 430 | Downstream of the 136AF–9B valve |
| What is the issue venture rated? 430 | At 1,200 gpm |
| How many pressure transmitters are found in the Type IV system? 430 | There are two, one is a pressure indicating and the other is differential pressure |
| What is the primary purpose of the pressure indicating transmitters (PIT)? 430 | To signal the microprocessor whenever system pressure drops below 60 psi, to call on the lead pump, and to call off the lead pump when system pressure reaches 175 psi. |
| What does the Type IV system use to connect to an aircraft for fueling? 431 | A pantograph |
| What type swivel joints are used on a hoseless pantograph? 431 | Stainless steel, single-plane, non-lubricated |
| What is the maximum electrical resistance throughout a hoseless pantograph? 431 | 1000 ohms |
| What size piping is used on a hose end pantograph? 431 | 3 inches in diameter, schedule-10 stainless steel |
| Why are lubricated swivel joints not allowed on a hose end pantograph? 431 | there is no filter separator after the pantograph |
| What valve is used as the refueling control valve in a Type IV system? 431 | 362AF–7 valve |
| What happens to the 58AF–9–1 when the Type IV system is placed in “loop flushing mode?” 431 | The valve opens wide and freefloats, which means the valve opens wide with any fuel flow |
| What happens to the 58AF–9–1’s solenoid “A” when the Type IV system is automatically started? 431 #14 | It is energized. |
| What are the four positions on the selector switch of a Type IV system? 432 #6 | Automatic, Off, Pantograph Flush, or Loop Flush mode operation |
| When do you get an “INVALID ENTRY” indication on the PCP address parameter? 432 #8 | When entering a value into an address that is not within the range of that parameter |
| When does the 58AF–3 solenoid energize during the “loop flush” mode? 435 | When the Auto-Off-Hand selector switch is placed in the “Hand” position. This starts the pump and energizes 58AF–3 PCV to close |
| How much fuel must be pumped to flush the loop of a Type IV system? 435 | Twice the loop’s capacity |
| (427) What type piping is used on the main fuel line of a Type IV system for a 2-inch pipe? | Epoxy-coated carbon steel, schedule 80 |
| (427) What type piping is used downstream of the Type IV issue filter separator for a 6-inch pipe? | seamless stainless steel, Schedule 40 minimum |
| (428) What size mesh screen is used in the receiving strainer of a Type IV system? | 60-mesh |
| (429) What pounds per square inch backpressure does the pressure relief control maintain on the high level shut-off valve on a Type IV underground operating storage tank? | 8 psi |
| (429) When does the high level light go out once the operator has acknowledged an activated alarm on a Type IV operating storage tank? | fuel level is below the high-high level alarm setting |
| (430) What type fueling pumps are used in a Type IV cut and cover tank? | Deep well turbine pumps, 600 gallons per minute (gpm) |
| (431) What type fuel dispensing hose is installed on a Type IV hose-end pantograph? | 3-inch, API 1529, semi-hardwall |
| (431) When is the solenoid on the 58AF–3 pressure control valve on the Type IV system deenergized? | When any pump is off |
| (431) What valve is used as the flush valve in a Type IV system? | 136AF–5B flush valve |
| (431) When the flush valve on a Type IV system is placed in the pantograph flush mode, the solenoid is | energized, main valve closed |
| (432) What do blue lines on the Type IV pump control panel graphic display represent? | pump discharge and fueling loop |
| (432) What condition would cause a resonating horn to sound on a Type IV system? | Emergency stop |
| (432) What switch, on the Type IV pump control panel, looks like a red mushroom? | Emergency stop |
| (433) In a Type IV system, pressure indicating transmitters are located on the | issue pipeline, downstream of the 136AF–9B emergency shut off (ESO) |
| (435) When a Type IV system is placed in the ‘loop flush’ mode, the solenoid on the 136AF–5B flush valve | deenergizes to open main valve |
| (436) When a Type IV system is placed in the ‘pantograph flush’ mode, the solenoid on the 136AF–5B flush valve | energized to close the main valve |
Created by:
Scottydick
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