How to turn the liquid oxygen pump shaft?
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Our liquid oxygen pump is a five-stage centrifugal pump, and it is necessary to perform shaft turning during air cooling and liquid cooling. So, how should the liquid oxygen pump be shaft turned? Please let the sailors know, thanks!
1. Check the sealing air pressure; 2. The pressure difference for sealing should be between 0.1 and 0.2 bar. 3 Confirm that all valves in the system are closed (if heating, dew point
After pre-cooling, use a fan to turn the shaft manually, being careful with the direction
Such multi-stage oxygen pumps generally do not allow shaft turning; if it is necessary to do so, it must be done after pre-cooling is complete, ensuring that the pump interior is completely filled with liquid before shaft turning is permitted
Remove the guard at the motor end, and turn the motor blades by hand
I’ve heard that for multi-stage pumps, it’s best to avoid rotating the shaft, but the manufacturers also often do so during the initial testing
The free end of the disc motor, on the fan side; some fans come with their own motor, in which case the entire unit is removed, along with the shaft end of the disc motor.
For safety’s sake, don’t forget to turn off the power – it’s better to be cautious. Hahaha, the whole family is watching us
Once heating is complete, start the pre-cooling pump: 1. Check that the inlet and outlet valves are fully closed, and verify that the sealing gas is functioning properly; our required pressure difference for sealing is around 40 kPa. 2. First, fully open the pump’s exhaust valve. 3. Open the pre-pump and post-pump purge valves. 4. Gradually open the return valve to full position; make sure the pump does not rotate in reverse. Then remove the motor cover and rotate the pump a few times to check if it is functioning properly. 5. After cooling by air for half an hour, slightly open the inlet valve. Adjust the blow-off valves at the front and back of the pump to a smaller opening; if liquid starts to flow out, close both valves completely. Once that is the case, the inlet valve can be opened fully. Pre-cool the pump for 1.5 hours, turning it over several times during this period, and the pump will then be properly pre-cooled. 6. Start the pump and apply load.
Remove the fan cover, and then you can hold one side of the pump shaft while turning the pump by hand, with liquid oxygen on the other side