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Fuels Vol. 2 Unit 2
Filtration Equipment
| Question | Answer |
|---|---|
| what are the 3 basic types of filter/separators used by the AF? (217) | MILSPEC horizontal, MILSPEC vertical, API 1581 |
| the function and purpose of the MILSPEC horizontal and vertical f/s's is to (217) | remove solids and water from the fuel |
| when the float in a vertical f/s rises to the top position, what happens? (217) | fuel discharge valve closes |
| which f/s is fabricated from aluminum or carbon steel and is internally coated w/ epoxy? (218) | API 1581 |
| f/s's must be equipped with what two components to operate properly? (218) | air eliminators and pressure reliefs |
| what plate is used to hold the coalescers and separators in position and support them firmly against vibrations? (218) | spider plate |
| what are the 3 major components of water drain valves that may be installed w/ f/s's? (219) | pilot valve assembly, water drain valve, and auxiliary hytrol control valve |
| what is the most widely used fuel discharge valve with a quick shutoff and flow control? (219) | 40AF-2A fuel discharge valve |
| on the 40AF-2A, what is used to create a differential pressure? (219) | orifice plate |
| on the 40AF-2A, what is pressure control and is either OPEN or CLOSED? (219) | powertrol |
| on the 40AF-2A, what control uses the differential pressure by the orifice place to control the flow of fuel through the control tubing? (219) | CDHS-2 |
| on the 40AF-2A, what control is used to stop all flow of fuel in the control tubing when there is excessive water in the f/s? (219) | auxiliary hytrol |
| what fuel discharge valve has combined the powertrol valve, hytrol, and ejector into one component? (219) | 40AF-2C fuel discharge valve |
| what is the name of the component on the 40AF-2C that has combined the powertrol valve, hytrol, and ejector into one? (219) | 3-way hytrol 1/8 orifice |
| pressure reliefs on f/s's must be set to what percent above system deadhead pressure? (220) | 10% above system deadhead pressure |
| do not touch the coalescer elements w/ what? (220) | bare hands |
| all horizontal f/s's should be equipped w/ what two components to provide for initial gravity-filling through the bottom connection and will allow the liquid levels in the two vessels to equalize? (220) | 3/4" ball valves and quick disconnect hose fittings |
| how does fuel pass through the filter cartridges? (217) | from inside to outside |
| what happens to the water that is removed from the fuel? (217) | discharged by the water drain valve |
| explain the effects of the fuel discharge valve when the pilot valve assembly float rises? (217) | as the float reaches the top position, the fuel discharge valve closes |
| which component will aid you in determining the water level in the MILSPEC f/s? (217) | sight gauge |
| where does the water collect in a vertical f/s? (217) | on top of the baffle plate |
| what occurs when the float reaches the MIDDLE position on f/s receiving from barges? (217) | the automatic water drain valve opens and discharges the water |
| what is the size of the API 1581 inlet and outlet lines? (218) | 6" normal pipe size |
| what type differential pressure gauge is installed on an API 1581 f/s? (218) | a direct-reading, piston type that measures the differential pressure across both coalescers and separators |
| what is the minimum capacity of the API 1581 coalescers and separators? (218) | coalscers - 2.27 GPM per inch of length, separators - 8.33 GPM per inch of length |
| what component protects the inlet supply tubing on a water drain system? (219) | a strainer |
| after changing elements in the f/s, whom must you notify? (220) | base fuels management office (FSC) |
| after changing the f/s, what info must your record on the f/s vessel? (220) | next change date and max allowable diff pressure |
| what is the probable cause if the 40AF-2A fuel discharge valve fails to open? (220) | by water in the f/s sump, by a defective diaphragm in the main valve or hytrol, or by the powertrol being stuck open |
| what is the probable cause if the 40AF-2C fuel discharge valve fails to close w/ water in the separator? (220) | the flanged float control is defective |
| what is the probable cause if the fuel discharge valve fails to maintain the proper rate of flow? (220 | a defective CDHS-2 diaphragm, clogged sensing lines, or an out of adjustment condition on the differential control |
| what are the 3 sizes of mesh screens used in fuel systems? (221) | 100-mesh, 60-mesh, and 7-mesh |
| what are the 3 types of strainers used? (221) | Y type, cylindrical type, and the basket type |
| strainers equipped w/ DP gauges must be cleaned when the DP reaches what psi? (221) | 10 psi |
| what inspections are required on strainers? (221) | for rust, corrosion , leaks, and damage or contamination by microorganisms |
| when the water drain valve is removed from the f/s, where is the control tubing that once went to the water drain cover chamber rerouted? (219) | downstream of the fuel discharge valve |
| how are the coalescers mounted on the API 1581 f/s? (218) | coalescers at the bottom and separators at the top |
| what will change positions and to what valve will pressure be directed when the float of the pilot valve assembly is in the TOP position? (217) | rotary disc; fuel discharge valve |
| when the float in a f/s is in the top position, to what component is pressure applied to close 40AF-2C? (219) | three-way control valve |
| when removing the KMU-416/F modification kit w/ 9 additional elements, how many elements must you remove from the front side to balance the manifold? (220) | 6 elements |
| when gravity filling a horizontal f/s from another horizontal f/s, how many minutes must you wait for the two f/s to equalize? (220) | 10 minutes |
| if the 40AF-2A, fuel discharge valve, fails to open, what should you check first? (220) | main valve diaphragm |
| what type of strainer is normally used as a line strainer in a pipeline? (221) | cylindrical type |
Created by:
Scottydick
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