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Fuels Vol. 4 Unit 1
Reverse Osmosis Water Purification Unit
| Question | Answer |
|---|---|
| Which ROWPUs are specifically designed for the US Air Force? 601 | WPES–20 and H-9518-2 |
| How much water does each of the onion bladders hold? 602 | 3000 gallons |
| What chemical is added to the influent line of the multimedia filter to aid in the removal of suspended solids (turbidity)? 603 | Polymer |
| What are the two operating positions of the backwash valve? 604 | “Backwash” and “normal.” |
| Which valve regulates the pressure exerted on the RO vessels? 604 | The “product regulate flow” valve. |
| Which valve regulates the amount of product water flow? 604 | The “product regulate flow” valve. |
| What happens when the vent vessels valve is closed? 604 | Closing the vent vessels valve forces water to go towards the RO vessels |
| What tests are taken using the standard color comparator kit? 604 | Chlorine and pH |
| At what pressure will the high-pressure relief valve activate? 605 | 1100 psi |
| What is the main purpose of the high-pressure switch on the ROWPU? 605 | It is a general protection device designed to protect the whole ROWPU from high pressure when the high pressure relief valve fails to activate |
| What could be the likely cause of the activation of the low-pressure switch on the ROWPU? 605 | The raw water pumps or the booster pump fails to deliver adequate flow or clogging of the cartridge filter |
| What are the three types of water sources? 606 | Seawater, brackish water, and freshwater |
| What is the TDS content of brackish water? 606 | 500 to 1500 ppm TDS |
| What is the purpose of the drain valves? 608 | To dewater the unit prior to shipment |
| Which instrument do you use to calibrate the chemical feed pumps? 608 | 100-ml graduated cylinder |
| Which instrument you use to check for turbidity? 608 | 1000-ml graduated cylinder, otherwise known as the “turbidity tube.” |
| What is the trouble reading for raw water flow? 608 | 25 gpm or less |
| What should you do when the brine tank is full? 609 | So you always have enough backwash water |
| What is the minimum allowable chlorine residual on product water? 609 | Two ppm free available chlorine |
| At how many gpm should the raw water flow be once both raw water pumps are on? 608 | 27–40 gpm |
| What happens when filter cracks are allowed to develop in the multimedia filter? 610 | Suspended solids pass through the multimedia filter and plug up the cartridge filter prematurely |
| How many hours can you operate the ROWPU without backwashing the multimedia filter? 610 | 20 hours |
| What is the quickest indicator of a crack in the filter bed of the multimedia filter? 610 | A sudden increase in flow on the raw water flow gauge |
| How much differential pressure across the filter is acceptable before the multimedia filter needs backwashing? 610 | 10 psid |
| What action must be performed before the multimedia filter is backwashed? 610 | The ROWPU must be shut down |
| What is the last step performed during shut-down procedures? 610 | Raw water pump #1 is stopped |
| How long is the backwash cycle? 610 | Approximately 13 minutes |
| What is the “telltale” sign of the need to feed citric acid? 611 | Rise in product water pH above 8 or when n 20 hours of production time has elapsed |
| When do you stop feeding citric acid? 611 | When the pH is back to 5 to 8 |
| What is the lowest pH value allowed for the citric acid solution? 612 | 3.5 pH |
| You must not allow the citric acid solution to exceed what temperature reading? 612 | 120ºF |
| How long do you operate the ROWPU when rinsing acid out of the RO vessels? 612 | 10 minutes |
| What is the maximum amount of TDS allowed prior to filling the product water tanks? 612 | TDS is below 1000 ppm |
| Which cleaning method should you use when the raw water source is high in dirt and silt? 612 | The surfactant method |
| What are the two element cleaning methods? 612 | Citric acid and surfactant |
| When should you replace the cartridge filter elements? 613 | When the pressure differential across the filter exceeds 20 psi |
| What must you do to the cartridge filter cover before you loosen the bolts and remove the cover? 613 | Mark the position of the cover onto the shell by scratching a line across the cover and shell with a nail |
| How many elements are in the cartridge filter? 613 | 8 |
| When are the RO elements changed? 614 | The RO elements are replaced when it is no longer possible to lower the TDS of product water below 1000 ppm using citric acid feeding and the element cleaning methods |
| What should you do before even attempting to replace the elements? 614 | First, find out which elements are faulty/defective and see if just replacing those elements will be sufficient |
| What would be the cause of a high front TDS reading and normal rear TDS reading from their respective sample/vent lines? 614 | Leak at front end connector preformed packing of RO element |
| (601) How many gallons per hour does the H–9518–2 reverse osmosis water purification unit produce (on the average)? | 600 gph |
| (602) What is the capacity of the reverse osmosis water purification unit raw water pump? | 30 gpm |
| (603) The movement of water through a permeable membrane from an area of lesser concentration to an area of higher concentration is called | reverse osmosis |
| (603) What percent of organic materials in water is removed by the reverse osmosis water purification unit? | 99 |
| (603) Unless otherwise directed by medical authorities, how many parts per million of chlorine residual must you keep in the product water produced by the reverse osmosis water purification unit? | 2 ppm |
| (603) Which chemical is used as a coagulant aid during the reverse osmosis water purification unit treatment process? | polymer |
| (603) Sodium hex is fed by the reverse osmosis water purification unit chemical feed pump at the | multimedia filter influent |
| (603) The optimum pH of water going through the reverse osmosis elements in the reverse osmosis water purification unit is | between 5 and 8 |
| (605) In which order do the high-pressure safety devices on the WPES–20 reverse osmosis water purification unit activate? | High-pressure relief valve, high-pressure switch, rupture disc assembly |
| (606) Technically speaking, what physical impact does the choice of a clear water source have on the reverse osmosis water purification unit (ROWPU)? | Less frequent backwashings will be realized |
| (606) How far away from the campsite should you set up the reverse osmosis water purification unit? | 100 feet upstream |
| (607) What is the maximum total dissolved solids (TDS) the factory calibrated in-line TDS monitor can read? | 3000 |
| (608) Which technical order do you use when operating the H–9581–2 reverse osmosis water purification unit? | 40W4–13–41 |
| (608) What is the initial setting of all the chemical pump control knobs on the reverse osmosis water purification unit? | 10 |
| (609) What is the maximum reverse osmosis pump pressure that should never be exceeded when operating the reverse osmosis water purification unit? | 960 psi (seawater), 500 psi (brackish water) |
| (612) Which reverse osmosis water purification unit pump is used to recirculate the citric acid solution during the reverse osmosis element cleaning procedure? | backwash |
| (612) Once initiated, when do you stop the reverse osmosis water purification unit reverse osmosis element cleaning procedure? | After 45 minutes has expired |
| (613) Cartridge filter replacement is indicated on the reverse osmosis water purification unit when the | differential pressure of the multimedia filter exceeds 20 psid |
| (614) What occurs when the end connectors or the interconnectors of the reverse osmosis water purification unit get damaged by high pressure? | osmosis |
Created by:
Scottydick
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