Troubleshooting Tips - Steam Jet Ejectors  

 

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
b) an ejector problem
c) a restriction in the discharge piping
d) noncondensible gas load is above the design rating pressure

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

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