| Observed problem | Problem source | Corrective measure | |||
| 1. | Poor ejector performance, unstable operation, pressure swings | 1. | Lower than design motive steam pressure | 1a. | Raise motive steam pressure to the minimum specified by the ejector manufacturer |
| 1b. | Bore the motive nozzle to a larger diameter to permit design steam consumption-consult with manufacturer to determine proper nozzle diameter | ||||
| 2. | Reduced ejector capacity and an increase in suction pressure | 2a. | Higher than design motive steam pressure | 2a. | Reduce motive steam pressure to specified pressure |
| 2b. | Wasted steam consumption | 2b. | Purchase new steam nozzles with smaller diameters designed for the higher motive steam pressure | ||
| 3. | Poor ejector performance, unstable operation, pressure swings | 3. | Higher than design steam temperature, excessive superheat | 3a. | Raise motive steam pressure |
| 3b. | Bore the motive nozzle to a larger diameter to permit increased steam consumption-consult with manufacturer to determine proper nozzle diameter | ||||
| 4. | Low ejector discharge temperature | 4a. | Reduced ejector capacity | 4. | The motive steam is wet, therefore, steam piping must be insulated and a moisture separator and trap added in the motive steam line just before the ejector |
| 5. | Higher than design discharge pressure | 5. | Poor ejector performance, unstable operation, pressure swings | 5a. | Look downstream for problems that could be:
a) an intercondenser problem |
| 6. | Higher than design suction pressure (assuming motive steam pressure and quality are normal and discharge pressure is equal to or less than design) | 6. | Greater than design process load or mechanical problems with ejectors-either worn internals or possible internal steam leak around steam nozzle threads | 6a. | Inspect internal dimensions and replace if necessary |
| 6b. | Tighten steam nozzle to steam chest if necessary or seal weld nozzle to steam chest |
