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Fuels Vol. 2 Unit 3
Meters and Gauges
| Question | Answer |
|---|---|
| if a meter is correct within what percent of total fuel displaced, it meets AF standards (222) | 0.2 percent |
| how often must meters be calibrated? (222) | annually |
| what are the two greatest enemies to any meter? (222) | dirt and air |
| what is the process of changing the drive or register in some way to make it add faster or slower w/ respect to the action of the measuring chamber? (222) | calibration |
| what type meter is a positive-displacement rotor type? (223) | Smith meter |
| what is the basic principle of calibration mechanisms? (222) | that of a gear train |
| how is major maintenance performed on a meter? (222) | by contract w/ the manufacturer |
| list inspections required on the smith meter (223) | visual inspection of meter assembly |
| what maintenance is performed on the smith meter? (223) | removal of dirt, replacement of gasket, and calibration of meters |
| what is the value of the coarse and fine adjustments on the smith meter? (223) | coarse, 138.8 cubic inches per 100 gallons; fine, 11.5 cubic inches per gallon |
| if the mastermeter reading is more than the meter you are calibrating, in which direction must you move the calibrating levers? (223) | outward |
| what is the most probable cause for the meter to over-register? (222) | air in the line |
| how is the register of a meter changed to match the actual fuel dispensed through the meter? (222) | change the gear train ratio |
| what maintains a tight seal in the measuring chamber of an A.O. smith meter? (223) | Teflon vane inserts |
| who should the repairs when an A.O. smith meter requires major maintenance? (223) | manufacturer |
| on what principle does the liquid control meter operate? (224) | positive displacement principle |
| what inspections are made on the liquid control meter? (224) | it is visually inspected for leaks and calibration |
| how is the meter calibrated? (224) | by using a mastermeter and making the necessary adjustment to the micrometer |
| what routine maintenance is performed on the Brodie meter? (225) | replacement of worn parts, gaskets, and calibration |
| describe the calibration process (225) | dispense 1k gallons of fuel through the meter and the mastermeter |
| the liquid control meter uses what type of movement to register the fuel? (224) | positive-displacement principle |
| leakage inside the back of a liquid control meter is caused by a faulty? (224) | O-ring |
| if you changed the Brodie coarse adjustment one position, what change would be made to the register reading? (225) | 6 gallons per 1000 gallons |
| how many hoses does the mastermeter have and where are they connected? (226) | 2 hoses; outlet side |
| what is used to isolate the hose you are not going to use on a mastermeter? (226) | flow control valve |
| how can you insure only 600 gallons will flow through the mastermeter? (226) | set the automatic stop at 600 gallons |
| what is the purpose of using the installed thermometer and a taped thermometer on the pipeline? (226) | to ensure the fuel through both meters is the same temp |
| how often must the mastermeter be calibrated? (226) | annually |
| what type of tank gauge can test a tank for leaks? (227) | magnetostrictive probe |
| a differential pressure gauge installed on a f/s measures the difference between the inlet (228) | higher pressure and lower outlet pressure |
| at a minimum, how often are simple pressure gauges calibrated? (229) | annually |
| how do you remove a magnetostrictive probe? (227) | disconnect the wires close to the probe and then pull out of the tank |
| what is the primary pneumatic tank gauge used by the AF? (227) | Barton 3500 |
| what does a pneumatic probe measure? (227) | fuel height or depth, temp, and density |
| what are the different types of gauges found in the fuel system? (228) | high-pressure, low-pressure or differential pressure, and pressure-vacuum gauges |
| how are the pressure gauges tested? (228) | by use of a deadweight or hydraulic-gauge tester |
| what does PMEL stand for? (228) | precision measurement equipment lab |
| how will you know what gauges are required to be sent into PMEL? (228) | from a listing sent out by PMEL monthly |
| what maintenance is required on gauges? (229) | cleaning gauge glass, removing moisture, calibration, and leak check |
| why do you center the vernier valve? (229) | to allow for maximum fine pressure adjustment |
| what is the purpose of the offset tube? (229) | to give clearance between the master and system gauges |
| what should you use a needle puller to remove a gauge needle? (229) | pulling or prying the needle may damage the gauge linkage |
| why would you be unable to re-calibrate a gauge? (229) | bent bourdon tube or damaged mechanical linkage |
Created by:
Scottydick
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