3e451 Volume 3 Operation And Maintenance Of Hydrant Systems And Components
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Questions and Answers
- 1.
(401) What positions are on the pump control switch?
- A.
Hand/off
- B.
Hand/auto
- C.
Hand/off/auto
- D.
Hand/off/manual
Correct Answer
C. Hand/off/autoExplanation
The pump control switch has three positions: hand, off, and auto. The hand position allows manual control of the pump, the off position turns the pump off, and the auto position enables automatic control of the pump. Therefore, the correct answer is hand/off/auto.Rate this question:
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- 2.
(401) The pressure/flow recorder indicates which of the following?
- A.
System pressure and issue flow rate
- B.
System pressure and issue/return flow rates
- C.
Issue/return flow rates and tank liquid level
- D.
Filter/separator differential pressure and tank liquid level
Correct Answer
B. System pressure and issue/return flow ratesExplanation
The pressure/flow recorder indicates system pressure and issue/return flow rates. This means that the recorder is able to measure and display the pressure within the system, as well as the flow rates of the fluid being issued and returned. This information is important for monitoring and analyzing the performance of the system, as well as identifying any potential issues or abnormalities in the flow rates.Rate this question:
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- 3.
(402) Most emergency service calls involve
- A.
Electrical shorts
- B.
No fuel delivery
- C.
Minor leaks
- D.
Jammed valves
Correct Answer
B. No fuel deliveryExplanation
Most emergency service calls involve no fuel delivery. This is because a lack of fuel can cause a vehicle or equipment to stop functioning, leading to an emergency situation. Without fuel, engines cannot operate, resulting in breakdowns or failures. This is a common issue that requires immediate attention from emergency services to ensure the safety and well-being of individuals involved.Rate this question:
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- 4.
(403) How many hydrant outlets are served by each panero pit?
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
A. 1Explanation
Each panero pit serves only one hydrant outlet.Rate this question:
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- 5.
(404) When operating normally, what part of the 302AF fueling/defueling valve restricts the flow of fuel in the control tubing and will not close?
- A.
Ejector strainer
- B.
CV flow control
- C.
Pressure relief control
- D.
Pressure-reducing control
Correct Answer
D. Pressure-reducing controlExplanation
The pressure-reducing control is the part of the 302AF fueling/defueling valve that restricts the flow of fuel in the control tubing and will not close when operating normally.Rate this question:
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- 6.
(404) A damaged diaphragm on the pressure reducing control is indicated by?
- A.
An uncontrolled downstream flow
- B.
A fuel leakage from the vent port
- C.
Uncontrolled downstream pressure
- D.
Fuel leaking from the disc removal plug
Correct Answer
B. A fuel leakage from the vent portExplanation
A damaged diaphragm on the pressure reducing control can cause a fuel leakage from the vent port. When the diaphragm is damaged, it may not be able to properly regulate the pressure, leading to excess pressure buildup. This excess pressure can cause fuel to leak from the vent port, indicating a problem with the diaphragm.Rate this question:
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- 7.
(404) What component closes the main valve of the 302AF fueling/defueling valve when there is excess flow at the hydrant outlet?
- A.
CRD
- B.
CDHS-3
- C.
Loaded CRL
- D.
CV flow control
Correct Answer
B. CDHS-3Explanation
The CDHS-3 component closes the main valve of the 302AF fueling/defueling valve when there is excess flow at the hydrant outlet.Rate this question:
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- 8.
(404) The primary purpose of the orifice plate on the 302AF fueling and defueling valve is to create differential
- A.
Pressure to operate the CDHS-2
- B.
Pressure to operate the CDHS-3
- C.
Flow to operate the CDHS-2
- D.
Flow to operate the CDHS-3
Correct Answer
B. Pressure to operate the CDHS-3Explanation
The orifice plate on the 302AF fueling and defueling valve is primarily used to create differential pressure to operate the CDHS-3. This means that the orifice plate helps to generate a pressure difference between two points, which is necessary for the CDHS-3 to function properly. It is not used for creating flow or operating the CDHS-2, as stated in the other options.Rate this question:
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- 9.
(404) During refueling, which 302AF fueling and defueling valve component holds the defuel side of the main valve component closed?
- A.
Loaded CRL
- B.
CDHS-3
- C.
Solenoid
- D.
Hytrol
Correct Answer
A. Loaded CRLExplanation
The correct answer is "Loaded CRL". The Loaded CRL component holds the defuel side of the main valve component closed during refueling.Rate this question:
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- 10.
(405) The first adjustment you make , when setting the pressure on a 302AF fueling and defueling valve, is establishing a pressure gauge reading of 10 psi above the desired delivery pressure. You do this by turning the adjustment screw on the
- A.
Pressure-reducing control (CRD) closkwise
- B.
Loading pressure-relief control (CRL) clockwise
- C.
CRD counterclockwise
- D.
Loading CRL counterclockwise
Correct Answer
A. Pressure-reducing control (CRD) closkwiseExplanation
When setting the pressure on a 302AF fueling and defueling valve, the first adjustment you make is to establish a pressure gauge reading of 10 psi above the desired delivery pressure. This is done by turning the adjustment screw on the pressure-reducing control (CRD) clockwise.Rate this question:
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- 11.
(405) What delivery pressure causes the fueling side, of the 302AF fueling and defueling valve, to close when turning the adjustment screw on the loading pressure relief controller counterclockwise?
- A.
5 psi above normal inlet pressure
- B.
5 psi above normal operating pressure
- C.
10 psi above normal inlet pressure
- D.
10 psi above normal operating pressure
Correct Answer
B. 5 psi above normal operating pressureExplanation
When the adjustment screw on the loading pressure relief controller is turned counterclockwise, it decreases the normal operating pressure. Therefore, the fueling side of the 302AF fueling and defueling valve will close when the delivery pressure is 5 psi above the new, lower normal operating pressure.Rate this question:
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- 12.
(405) Approximately how long do you want it to take the fueling valve to open when you adjust the CV flow control on the 302AF fueling and defueling valve?
- A.
10 seconds
- B.
20 seconds
- C.
30 seconds
- D.
40 seconds
Correct Answer
B. 20 secondsExplanation
The CV flow control on the 302AF fueling and defueling valve is used to adjust the time it takes for the fueling valve to open. The question asks for the approximate duration desired for the fueling valve to open when the CV flow control is adjusted. The correct answer is 20 seconds, indicating that this is the desired time for the valve to open when the CV flow control is adjusted.Rate this question:
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- 13.
(406) What components are magnetized when you place a magnet on the refuel contact points at the hydrant on the modified panero system?
- A.
The 302AF electrical solenoid only
- B.
The deep-well pump only
- C.
The 302AF solenoid and the defueling pump
- D.
The deep-well turbine pump and the 302AF electrical solenoid
Correct Answer
D. The deep-well turbine pump and the 302AF electrical solenoidExplanation
When a magnet is placed on the refuel contact points at the hydrant on the modified panero system, the components that are magnetized are the deep-well turbine pump and the 302AF electrical solenoid.Rate this question:
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- 14.
(406) To remedy a leakage on the Philidelphia hydrant adapter, which one of the following would you usually replace?
- A.
The coupling poppet
- B.
The vacuum breaker
- C.
The flange gasket
- D.
The solenoid
Correct Answer
C. The flange gasketExplanation
To remedy a leakage on the Philadelphia hydrant adapter, the most common component that would need to be replaced is the flange gasket. The flange gasket is responsible for creating a tight seal between two connecting parts, in this case, the hydrant adapter and the hydrant. If there is a leakage, it indicates that the flange gasket is worn out or damaged and needs to be replaced to restore the proper seal and prevent further leakage.Rate this question:
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- 15.
(407) How many manual valves are found in the lateral control pit of the Pritchard system?
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
C. 3Explanation
In the lateral control pit of the Pritchard system, there are three manual valves.Rate this question:
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- 16.
(407) When you place a magnet on the defuel magnetic control switch, during defueling, the solenoid on the
- A.
Refueling control valve and defueling valve are energized
- B.
Defueling control valve and the defueling pump are energized
- C.
Rate-of-flow control valve and defuel pump are energized
- D.
Defueling control valve and deep-well turbine pumps are energized
Correct Answer
B. Defueling control valve and the defueling pump are energizedExplanation
When you place a magnet on the defuel magnetic control switch, it activates the defueling control valve and the defueling pump. This allows for the fuel to be pumped out of the system and into a separate container or storage tank. The activation of these components ensures that the defueling process can occur smoothly and efficiently.Rate this question:
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- 17.
(407) What lateral control pit component automatically cuts off the defuel pump when a predetermined amount of inches of mercury is reached?
- A.
Solenoid control switch
- B.
Pump circuit breaker
- C.
Vacuum control switch
- D.
Panel selector switch
Correct Answer
C. Vacuum control switchExplanation
The vacuum control switch is the correct answer because it automatically cuts off the defuel pump when a predetermined amount of inches of mercury is reached. This switch is responsible for controlling the flow of vacuum to various components in the lateral control pit, including the defuel pump. Once the predetermined amount of inches of mercury is reached, the switch activates and shuts off the pump to prevent any further fueling and maintain safety.Rate this question:
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- 18.
(408) If the cover chamber pressure on the 90AF-8 refueling control valve stays between the inlet and outlet pressure, the valve
- A.
Pulsates
- B.
Modulates
- C.
Opens fully
- D.
Closes fully
Correct Answer
B. ModulatesExplanation
If the cover chamber pressure on the 90AF-8 refueling control valve stays between the inlet and outlet pressure, the valve modulates. This means that the valve adjusts the flow of fluid or gas by varying the size of the opening. It does not fully open or close, but instead regulates the flow to maintain a steady pressure within the desired range.Rate this question:
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- 19.
(408) When the cover chamber pressure on the 90AF-8 refueling control valve is at least as great as the inlet pressure, the valve will
- A.
Pulsate
- B.
Modulate
- C.
Open fully
- D.
Close fully
Correct Answer
D. Close fullyExplanation
When the cover chamber pressure on the 90AF-8 refueling control valve is at least as great as the inlet pressure, the valve will close fully. This means that the valve will completely shut off the flow of fluid or gas through it. This is because the pressure in the cover chamber is equal to or greater than the inlet pressure, creating a force that pushes the valve to close tightly and prevent any further flow.Rate this question:
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- 20.
(408) What happens to the auxiliary hytrols A and B, on the 90AF-8 refueling control valve, when excess flow trips the CDHS-3 pressure differential control?
- A.
A and B close
- B.
A and B open
- C.
A opens and B closes
- D.
A closes and B opens
Correct Answer
C. A opens and B closesExplanation
When the CDHS-3 pressure differential control detects excess flow, it trips and activates a mechanism that causes auxiliary hytrol A to open and auxiliary hytrol B to close.Rate this question:
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- 21.
(408) The pressure relief control, on the 90AF-8 is set to
- A.
5 pounds per square inch (psi) higher than the normal operating pressure
- B.
5 psi higher than the inlet pressure of the 90AF-8
- C.
5 psi higher than the 51AF-4
- D.
5 higher than the normal inlet pressure of the 51AF-4
Correct Answer
A. 5 pounds per square inch (psi) higher than the normal operating pressureExplanation
The pressure relief control on the 90AF-8 is set to 5 pounds per square inch (psi) higher than the normal operating pressure. This means that when the pressure in the system exceeds the normal operating pressure, the relief control will activate and release the excess pressure to maintain the system within safe limits. By setting the relief pressure 5 psi higher than the normal operating pressure, it ensures that the relief control will only activate when necessary and prevent any potential damage or failure in the system.Rate this question:
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- 22.
(409) What pressure rate must you establish before setting the pressure relief control on the 90AF-8 refueling control valve?
- A.
2 to 3 pounds per square inch (psi) above normal downstream pressure
- B.
2 to 3 psi above normal upstream pressure
- C.
5 psi above normal downstream pressure
- D.
5 psi above normal upstream pressure
Correct Answer
C. 5 psi above normal downstream pressureExplanation
Before setting the pressure relief control on the 90AF-8 refueling control valve, you must establish a pressure rate of 5 psi above the normal downstream pressure. This ensures that there is enough pressure to effectively control the flow of fuel during refueling operations.Rate this question:
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- 23.
(409) Which of the following would probably cause the 90AF-8 refueling control valve to open, then close?
- A.
Auxiliary hytrol A closing
- B.
CDHS-3 tripping
- C.
Solenoid never energizing
- D.
Pressure relief control set too high
Correct Answer
B. CDHS-3 trippingExplanation
The CDHS-3 tripping would probably cause the 90AF-8 refueling control valve to open, then close. The CDHS-3 is a system that monitors and controls various functions in the refueling process. If it trips, it indicates a malfunction or abnormal condition, which could lead to the valve opening and then closing as a safety measure to prevent any further issues or damage.Rate this question:
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- 24.
(409) If the 90AF-8 refueling control valve fails to control delivery pressure, which trouble could cause the problem?
- A.
The solenoid is not energized
- B.
A ruptured diaphragm in hytrol A
- C.
The CV flow control is not set properly
- D.
The pressure relief control is set too low
Correct Answer
D. The pressure relief control is set too lowExplanation
If the pressure relief control is set too low, it means that the valve is not able to relieve excess pressure, causing the delivery pressure to be uncontrolled. This could result in the 90AF-8 refueling control valve failing to control the delivery pressure.Rate this question:
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- 25.
(410) Which statement best describes what is removed from the strainer orifice used on the 50AF-2 pressure relief valve?
- A.
Only the primary jet
- B.
Only the secondary jet
- C.
The primary and secondary jets
- D.
Neither the primary nor the secondary jets
Correct Answer
A. Only the primary jetExplanation
The strainer orifice used on the 50AF-2 pressure relief valve removes only the primary jet. The primary jet is the main flow of fluid that passes through the orifice. The secondary jet, on the other hand, is not removed. Therefore, the correct answer is that only the primary jet is removed from the strainer orifice.Rate this question:
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- 26.
(411) How often should you check the 50AF-2 pressure relief valve to its opening and relieving pressure?
- A.
Yearly
- B.
Semi-annually
- C.
Quarterly
- D.
Monthly
Correct Answer
B. Semi-annuallyExplanation
The pressure relief valve should be checked semi-annually to ensure that it is functioning properly and relieving pressure as needed. Checking the valve on a regular basis helps to prevent any potential pressure buildup that could lead to equipment damage or safety hazards. By checking the valve semi-annually, any issues or malfunctions can be identified and addressed in a timely manner, ensuring the continued safe operation of the system.Rate this question:
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- 27.
(411) The standard pressure setting, on the 50AF-2 pressure valves pressure relief control (CRL), is based on the 90AF-8 refueling valves pressure of
- A.
2 to 3 psi above its normal operating pressure
- B.
2 to 3 psi above its normal inlet pressure
- C.
10 psi above its normal operating pressure
- D.
10 psi above its normal inlet pressure
Correct Answer
D. 10 psi above its normal inlet pressureExplanation
The correct answer is 10 psi above its normal inlet pressure. This means that the standard pressure setting on the 50AF-2 pressure relief control (CRL) valve is set to be 10 psi higher than the normal inlet pressure of the 90AF-8 refueling valve. This setting ensures that the pressure relief control valve will open and relieve pressure when the pressure in the refueling valve exceeds its normal operating pressure by 10 psi.Rate this question:
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- 28.
(412) The components of the 134AF defueling control valve include; a valve position indicator, solenoid
- A.
Flow clean strainer,and ejector
- B.
Ejector, and pressure relief valve
- C.
Orifice strainer, and pressure relief valve
- D.
Ejector strainer, and pressure differential control
Correct Answer
A. Flow clean strainer,and ejectorExplanation
The components of the 134AF defueling control valve include a flow clean strainer and an ejector.Rate this question:
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- 29.
(412) How often is the 134AF defueling control valve operationally inspected?
- A.
Monthly
- B.
Quarterly
- C.
Semi-annually
- D.
Annually
Correct Answer
B. QuarterlyExplanation
The 134AF defueling control valve is operationally inspected on a quarterly basis. This means that the inspection is conducted every three months. This regular inspection schedule ensures that the valve is functioning properly and can be maintained effectively. By inspecting the valve on a quarterly basis, any potential issues or malfunctions can be identified and addressed in a timely manner, reducing the risk of operational failures or safety hazards.Rate this question:
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- 30.
(412) What condition exists when fuel leaks past the 134AF main valve disc and seat?
- A.
The 50AF-2 valve does not open
- B.
Hydrant pressure becomes very high
- C.
The defuel pump rotates slowly during refueling
- D.
The refueling valve opens and clsoes
Correct Answer
C. The defuel pump rotates slowly during refuelingExplanation
When fuel leaks past the 134AF main valve disc and seat, the defuel pump rotates slowly during refueling.Rate this question:
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- 31.
(413) Which component on the 41AF rate-of-flow control valve causes the main valve to throttle?
- A.
Ejector
- B.
Solenoid
- C.
Hytrol check
- D.
Differential control
Correct Answer
D. Differential controlExplanation
The differential control is the component on the 41AF rate-of-flow control valve that causes the main valve to throttle. The differential control is responsible for regulating the flow of fluid through the valve by adjusting the position of the main valve. It senses the pressure difference between the inlet and outlet of the valve and uses this information to modulate the opening of the main valve, thereby controlling the rate of flow.Rate this question:
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- 32.
(413) To adjust the flow rate of the differential control on the 41AF rate-of-flow control valve,
- A.
Clockwise for maximum spring tension
- B.
Clockwise for minimum spring tension
- C.
Counterclockwise for maximum spring tension
- D.
Counterclockwise for minimum spring tension
Correct Answer
D. Counterclockwise for minimum spring tensionExplanation
To adjust the flow rate of the differential control on the 41AF rate-of-flow control valve, the correct action is to turn it counterclockwise. This will decrease the tension of the spring, resulting in a lower flow rate. By reducing the spring tension, the valve will allow more fluid to pass through, thus decreasing the flow rate.Rate this question:
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- 33.
(413) What is the probable cause when the 41AF-10 main valve opens during refueling?
- A.
Leakage through normally open solenoid valve
- B.
Leakage through normally closed solenoid valve
- C.
Leakage through solenoid valve during slow flow
- D.
Check valve installed backwards
Correct Answer
B. Leakage through normally closed solenoid valveExplanation
The probable cause when the 41AF-10 main valve opens during refueling is leakage through the normally closed solenoid valve. This means that the solenoid valve, which is supposed to be closed during refueling, is experiencing leakage and allowing fuel to pass through it. This can lead to unintended opening of the main valve and potentially cause safety hazards during refueling operations.Rate this question:
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- 34.
(414) When defueling stops, the 352AF hydrant adapter controls its own fuel level in order to
- A.
Keep moisture out of the system
- B.
Prevent corrosion in the piping system
- C.
Keep the fuel pressure from getting too high
- D.
Prevent air from entering the installed piping system
Correct Answer
D. Prevent air from entering the installed piping systemExplanation
The 352AF hydrant adapter controls its own fuel level in order to prevent air from entering the installed piping system. This is important because air can cause disruptions in the fuel flow and can lead to issues such as fuel starvation or airlock. By maintaining a consistent fuel level, the hydrant adapter ensures that only fuel is present in the system, preventing any air from entering and potentially causing damage or disruptions in the fuel supply.Rate this question:
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- 35.
(414) At what maximum differential pressure, in pounds per square inch (psi) does the 352AF hydrant adapters automatic bypass valve open?
- A.
15
- B.
25
- C.
35
- D.
45
Correct Answer
C. 35Explanation
The correct answer is 35. This means that the automatic bypass valve of the 352AF hydrant adapters opens at a maximum differential pressure of 35 pounds per square inch (psi).Rate this question:
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- 36.
(414) After activating an emergency stop switch at the type 2 hydrant outlet, you reset the system to refuel by
- A.
Placing the magnet on the refuel magnetic control station switch
- B.
Placing the cover back on the emergency switch
- C.
Manually resetting the controls in the lateral control pit
- D.
Manually resetting the controls in the pumphouse control room
Correct Answer
D. Manually resetting the controls in the pumphouse control roomExplanation
After activating the emergency stop switch at the type 2 hydrant outlet, the system needs to be manually reset. This manual reset is done in the pumphouse control room. This means that the controls in the pumphouse control room need to be adjusted or reset in order to resume the refueling process.Rate this question:
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- 37.
(414) What type of ground rods are hydrant outlets grounded to in the piping system of the type 2 hydrant system?
- A.
Tin
- B.
Black steel
- C.
Cast iron
- D.
Galvanized/Stainless steel
Correct Answer
D. Galvanized/Stainless steelExplanation
In the piping system of a type 2 hydrant system, hydrant outlets are grounded to galvanized/stainless steel ground rods. Grounding the hydrant outlets to these types of rods helps to ensure that any electrical currents or faults are safely directed into the ground, preventing damage to the system and reducing the risk of electrical shock or fire hazards. Tin, black steel, and cast iron are not typically used for grounding rods in this type of system.Rate this question:
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- 38.
(415) How often is the 41AF-10 inspected?
- A.
Monthly
- B.
Quarterly
- C.
Semi-annually
- D.
Annually
Correct Answer
C. Semi-annuallyExplanation
The 41AF-10 is inspected semi-annually, which means it is checked twice a year. This frequency of inspection ensures that any potential issues or problems can be identified and addressed in a timely manner. Regular inspections help maintain the safety and functionality of the 41AF-10, ensuring that it is in good working condition and can be used effectively.Rate this question:
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- 39.
(415) What are the low and high settings (pounds per square inch {psi}), respectively, for the pressure relief controls on the 51AF-4 valve?
- A.
5 psi and 5 psi above the CRL on the 90AF-8
- B.
5 psi and 5 psi above the CRL on the 50AF-2
- C.
10 psi and 5 psi above the CRL on the 90AF-8
- D.
10 psi and 5 psi above the CRL on the 50AF-2
Correct Answer
A. 5 psi and 5 psi above the CRL on the 90AF-8Explanation
The low and high settings for the pressure relief controls on the 51AF-4 valve are 5 psi and 5 psi above the CRL on the 90AF-8.Rate this question:
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- 40.
(415) The primary purpose of having 5 psi in the lateral piping on the 51AF-4 rapid defuel valve is to
- A.
Relieve excess pressure during refueling
- B.
Make sure the defuel piping stays full of fuel
- C.
Make sure the hydrant outlet line stays full of fuel
- D.
Prevent reverse flow during rapid flow defueling
Correct Answer
C. Make sure the hydrant outlet line stays full of fuelExplanation
The primary purpose of having 5 psi in the lateral piping on the 51AF-4 rapid defuel valve is to make sure the hydrant outlet line stays full of fuel. This pressure helps to maintain a continuous flow of fuel from the hydrant outlet line, ensuring that it does not become empty or lose pressure during rapid flow defueling. By keeping the hydrant outlet line full of fuel, the valve helps to prevent any interruptions or reverse flow during the defueling process.Rate this question:
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- 41.
(416) Before adjusting the high pressure relief control on the 51AF-4 valve, you must also adjust the pressure reducing control (CRD) 90AF-8 valve to
- A.
2 psi above normal operating pressure
- B.
3 psi above normal operating pressure
- C.
5 psi above normal operating pressure
- D.
10 psi above normal operating pressure
Correct Answer
C. 5 psi above normal operating pressureExplanation
To ensure proper functioning of the high pressure relief control on the 51AF-4 valve, it is necessary to adjust the pressure reducing control (CRD) 90AF-8 valve to a pressure that is 5 psi above the normal operating pressure. This adjustment helps to create a sufficient pressure differential between the two valves, allowing the relief control to effectively regulate the pressure and prevent any potential overpressure situations.Rate this question:
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- 42.
(416) According to the troubleshooting guide, Which component has failed if fuel is bypassed during a fueling operation?
- A.
Solenoid failed to deenergize
- B.
Solenoid failed to energize
- C.
CV-flow control
- D.
Low-pressure relief control
Correct Answer
B. Solenoid failed to energizeExplanation
If fuel is bypassed during a fueling operation, it means that the solenoid failed to energize. The solenoid is responsible for controlling the flow of fuel, and if it fails to energize, it will not allow fuel to pass through, resulting in fuel bypassing the system. Therefore, the correct answer is solenoid failed to energize.Rate this question:
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- 43.
(417) What type piping, 12 inches in diameter, is used in the hydrant loop of a type III system?
- A.
Carbon steel, schedule 80S
- B.
Carbon steel, schedule 40S
- C.
Stainless steel, schedule 20S
- D.
Stainless steel, schedule 10S
Correct Answer
C. Stainless steel, schedule 20S -
- 44.
(417) What type steel is used in the control tubing of the type III system?
- A.
Copper
- B.
Carbon
- C.
Galvanized
- D.
Stainless Steel
Correct Answer
D. Stainless SteelExplanation
Stainless steel is the correct answer for the type of steel used in the control tubing of the type III system. Stainless steel is a durable and corrosion-resistant material that is commonly used in various industries, including oil and gas. It is preferred for control tubing as it can withstand high pressure and temperature conditions, ensuring the safe and efficient operation of the system. Copper, carbon, and galvanized steel are not suitable for control tubing in this context as they do not possess the same level of corrosion resistance and strength as stainless steel.Rate this question:
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- 45.
(418) At what differential pressure must the receiving strainer in the type III system be cleaned?
- A.
3 psi
- B.
10 psi
- C.
15 psi
- D.
20 psi
Correct Answer
B. 10 psiExplanation
The receiving strainer in a type III system must be cleaned at a differential pressure of 10 psi. This means that when the pressure difference between the inlet and outlet of the strainer reaches 10 psi, it is necessary to clean the strainer to maintain proper functioning of the system. Cleaning the strainer helps remove any debris or particles that may have accumulated, ensuring that the system continues to operate efficiently.Rate this question:
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- 46.
(418) What is the standard American Petroleum Institute (API) rate and gallons per minute (gpm) of receiving filter seperators used in the type III system?
- A.
1529, 600 gpm
- B.
1529, 1200gpm
- C.
1581, 600 gpm
- D.
1581, 1200 gpm
Correct Answer
C. 1581, 600 gpm -
- 47.
(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
- A.
15 psi is sensed across the receiving separator
- B.
15 psi is sensed across the orifice plate on the receiving separator
- C.
10 psi is sensed across the receiving separator
- D.
10 psi is sensed across the orifice plate on the receiving separator
Correct Answer
A. 15 psi is sensed across the receiving separatorExplanation
When 15 psi is sensed across the receiving separator, the 40-28G bypass valve opens and allows fuel to bypass the receiving separators. This occurs because the differential pressure of 15 psi indicates that there is a high pressure on the receiving side, which triggers the bypass valve to open and relieve the excess pressure by diverting the fuel flow.Rate this question:
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- 48.
(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?
- A.
Reset the control panel
- B.
Clean the receiving strainer
- C.
Manually reset the 40-28G
- D.
Manually reset the CDHS-3A
Correct Answer
D. Manually reset the CDHS-3AExplanation
To get the 40-27G filter separator valve to operate again after it has closed due to high differential pressure, the CDHS-3A must be manually reset.Rate this question:
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- 49.
(418) A gallons per minute displacement meter is used in the receiving line of a type III system. Which type does it use?
- A.
600 Positive
- B.
1200 Positive
- C.
600 Non-positive
- D.
1200 Non-positive
Correct Answer
D. 1200 Non-positiveExplanation
A gallons per minute displacement meter measures the flow rate of liquid in a system. In a type III system, the receiving line is where the liquid is being received. The fact that the displacement meter is used in the receiving line indicates that it is measuring the incoming flow of liquid. The term "non-positive" suggests that the meter is not measuring a positive flow rate, but rather a flow rate that is either zero or negative. Therefore, the correct answer is 1200 Non-positive, indicating that the displacement meter used in the receiving line of a type III system measures a non-positive flow rate of 1200 gallons per minute.Rate this question:
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- 50.
(419) Where is the ball float for the 413AF-5A high-level shut-off valve on an operating storage tank located?
- A.
On top of the tank in the float well
- B.
On top of the tank in the gauging well
- C.
On the exterior side of the tank at the required shut-off height
- D.
On the interior side of the tank at the require shut-off height
Correct Answer
C. On the exterior side of the tank at the required shut-off heightExplanation
The ball float for the 413AF-5A high-level shut-off valve is located on the exterior side of the tank at the required shut-off height. This means that the float is positioned outside of the tank, at a specific height that allows it to effectively shut off the valve when the tank reaches a certain level. Placing the float on the exterior side of the tank ensures that it is easily accessible for maintenance and inspection purposes.Rate this question:
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