3e451 Volume 3 Operation and Maintenance Of Hydrant Systems and Components

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.

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.

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.

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.

The correct answer is "Emergency stop." On the type IV pump control panel, there is a switch that resembles a red mushroom. This switch is known as the emergency stop switch. It is designed to quickly and easily shut down the system in case of an emergency or malfunction. By pressing this switch, all operations of the pump control panel will be immediately halted, ensuring safety and preventing any further damage or harm.

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.

The correct answer is "When it is not used in 30 days." This means that the type III system, which is presumably a specific system or equipment, needs to be flushed if it has not been used for a period of 30 days. This flushing process is likely necessary to ensure that the system remains in proper working condition and to prevent any potential issues or malfunctions that could arise from prolonged periods of inactivity.

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.

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.

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.

If the third pump fails to start in a type III system, the next pump in the predetermined sequence will be automatically called on. This means that the system will move on to the fourth pump and attempt to start it.

Each panero pit serves only one hydrant outlet.

The CDHS-3 component closes the main valve of the 302AF fueling/defueling valve when there is excess flow at the hydrant outlet.

The first symbol in a rung of ladder logic represents contacts. Contacts are used to represent the input conditions or events that must be true in order for the rung to be active. They can be normally open (NO) or normally closed (NC) and are used to control the flow of current in the ladder logic circuit.

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.

Deep well turbine pumps are used in a type IV cut and cover tank. These pumps are capable of pumping fuel at a rate of 600 gallons per minute (gpm). They are specifically designed for deep well applications and are commonly used in underground storage tanks. The use of deep well turbine pumps ensures efficient and reliable fueling operations in the tank. Horizontal centrifugal pumps, on the other hand, are not suitable for this type of tank as they are not designed for deep well applications. Additionally, the 1200 gpm option is incorrect as it exceeds the specified pumping capacity for this type of tank.

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.

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.

In the lateral control pit of the Pritchard system, there are three manual valves.

The back-up battery will maintain the type III microprocessor's memory for a minimum of 30 days. This means that even if there is a power outage or the main power source fails, the back-up battery will ensure that the memory of the microprocessor remains intact for at least 30 days.

To flush a type III system, the correct procedure is to turn the selector switch on the pump control panel to "Flush" and all available pump switches to "hand". This means that the system will be manually operated by hand pumps during the flushing process. The "Flush" setting ensures that the system is in the correct mode for flushing, and using all available pump switches to "hand" ensures that all pumps are manually operated to flush the system thoroughly.

When the issue venturi senses 2400 gpm and the return venturi senses 1000 gpm for 15 seconds, it indicates that there is an excess flow in the system. In order to balance the flow and prevent damage, the fourth pump is called off. This helps to regulate the flow and maintain stability in the pumping system.

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.

When the system is placed in the flush mode, solenoid "B" on the 58AF-9-1 defuel/flush valve energizes. This energization allows the main valve to open, enabling the flushing process to occur. The other options, such as manually starting the fueling pumps or placing the system in automatic mode, do not directly relate to the energization of solenoid "B" or the opening of the main valve.

The blue lines on the type IV pump control panel graphic display represent the pump discharge and fueling loop. This means that these lines indicate the path through which the fuel is pumped out and circulated for fueling purposes.

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.

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.

The National Fire Protection Agency 70 is responsible for defining the temperature rating for motors used with fueling pumps in the type III system.

In a type III system, the overfill valve in the product recovery tank closes at a full percentage of 80. This means that when the tank reaches 80% capacity, the overfill valve will automatically shut off to prevent any further filling and avoid overfilling the tank.

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.

The correct answer is Division I, Group D. This is because a type III operating storage tank level indicator servo compartment must be approved for hazardous locations and listed for use in class I, division I. Division I indicates that the hazardous material is present continuously or intermittently during normal operations, and Group D represents a hazardous material that is a flammable gas or vapor. Therefore, Division I, Group D is the appropriate classification for the operating storage tank level indicator servo compartment.

The differential pressure transmitter sends a milliampere (mA) signal that corresponds to the flow rate through the venturi in the type III system. In this case, when 1200 gallons per minute flows through the venturi, the transmitter sends a signal of 12 mA.

The correct answer is the pneumatic deadman. The pneumatic deadman is a safety device that is used to control the flow of fuel during refueling operations. It is designed to automatically shut off the flow of fuel if the operator releases the deadman handle or if there is a loss of pressure in the system. This helps to prevent overfilling or fuel spills, ensuring the safety of the aircraft and personnel involved in the refueling process.

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.

In a type III system, the pressure reliefs and other drains are connected to the product recovery tank using 2-inch piping. This size of piping is necessary to ensure the efficient flow and drainage of fluids from the system. Smaller sizes like 1/2-inch or 1-inch may not be sufficient to handle the volume of fluids and could result in clogging or inadequate drainage. Similarly, a 1 1/2-inch pipe may be too small for optimal flow, while a 2-inch pipe provides the necessary capacity for proper drainage.

Each issue filter separator in the type III system is rated for 600 gallons per minute.

To set up the pump control panel for fueling on the type III system, the correct procedure is to select the lead pump first. After that, the system should be placed in automatic mode, which allows for automatic control of the pump. Finally, the SYSTEM START button should be pushed to initiate the fueling process.

The correct answer is 60. In a type IV system, the receiving strainer uses a mesh screen with a size of 60. This size is specifically chosen to allow the desired amount of liquid to pass through while filtering out any larger particles or debris that could potentially clog the system or cause damage. A mesh screen with a smaller size would restrict the flow too much, while a larger size would allow too many particles to pass through. Therefore, a size of 60 is the appropriate choice for the receiving strainer in a type IV system.

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.

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.

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.

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.

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.

The correct answer is 100 at the farthest hydrant outlet. This means that the 58AF-9 back pressure control valve will open to control the hydrant loop pressure when the pressure at the farthest hydrant outlet reaches 100 pounds per square inch.

When fuel leaks past the 134AF main valve disc and seat, the defuel pump rotates slowly during refueling.

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.

When the two solenoids on the 136AF-9B emergency shut-off valve are energized, the valve does not open or close, but rather it free floats. This means that it is not fixed in either the open or closed position, but can move freely based on the conditions and pressure in the system.

When fuel reaches the high-high level alarm setting on a type III operating storage tank, the pump control panel (PCP) will flash to visually indicate the warning. Additionally, a resonating horn will sound to audibly alert the operator of the high-high level alarm. This combination of flashing PCP and resonating horn sounds allows for both visual and auditory warnings to be received by the operator.

The product recovery tank has a size of 4,000 gallons.

As demand for fuel flowing through the 362AF-7 refueling control valve decreases in a type IV system, flow increases through the return venturi. This is because the return venturi is designed to handle excess fuel that is not needed for refueling the aircraft. When the demand for fuel decreases, the excess fuel is diverted through the return venturi to ensure that the fuel system remains balanced and does not become overloaded.