Lubricating oil pump switching
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There is a problem with the motor of the lubricating oil pump used for operating the compressor unit; it is necessary to switch to using the auxiliary oil pump instead. We don’t have any experience in performing such a switch yet. Could those who have experience please share the steps for making this switch? After all, it involves switching a compressor unit, so a smooth transition is essential
By default, your lubrication pump should be a screw pump. 1. Open the valve of the backup pump to return oil to the tank, and close the outlet valve. Run it for a while to see if it works properly. 2. Two people are involved in the operation: one slowly closes the backup return valve while the other slowly opens the outlet valve of the backup pump, to ensure stable oil pressure. 3. One person slowly opens it and then uses the pump return valve to ensure stable oil pressure. Then it can be stopped at the pump transfer. The internal control system can bypass the oil pressure interlock to prevent shutdowns due to fluctuations. Pay special attention to whether the check valve at the outlet of the backup pump is functioning properly; if it does not work, simply open the inlet and outlet valves of the backup pump to start it.
By default, your lubrication pump should be a screw pump. 1. Open the valve of the backup pump to return oil to the tank, and close the outlet valve. Run it for a while to see if it works properly. 2. Two people are involved in the operation: one slowly closes the backup return valve while the other slowly opens the outlet valve of the backup pump, to ensure stable oil pressure. 3. One person slowly opens it and then uses the pump return valve to ensure stable oil pressure. Then it can be stopped at the pump transfer. The internal control system can bypass the oil pressure interlock to prevent shutdowns due to fluctuations. Pay special attention to whether the check valve at the outlet of the backup pump is functioning properly; if it does not work, simply open the inlet and outlet valves of the backup pump to start it.
There’s no need to close the outlet valve of the standby pump; it’s sufficient to simply open the valve leading back to the fuel tank
If you are performing reverse pump operation, it is recommended to close the outlet of the standby pump and open the outlet of the operating pump, while closing the outlet of the operating pump as well, to coordinate the operations.
Contact the control room staff to start the backup pump first; once the pump is operating properly, shut down the main pump
Yes, first of all, it is assumed that the flow pattern and configuration of the lubricating oil system are reasonable, with the oil pump being a positive displacement pump (either a gear pump or a screw pump). Start the auxiliary pump; once it is running smoothly, shut down the main pump. If the valve configuration allows for maintenance, close the inlet and outlet valves of the main pump to carry out maintenance on it. It’s not that complicated.
It depends on the condition of the check valve. If the check valve fails, the lubricating oil from the pump outlet will then flow back to the oil tank through the backup pump outlet valves via the return line. Although the probability of this happening is low, it’s always necessary to be careful.
There is concern about excessive pressure if the backup pump is started directly. If the check valve doesn’t work well, you can also do it as you suggested.
It depends on the condition of the check valve. If the check valve fails, the lubricating oil from the pump outlet will then flow back to the oil tank through the backup pump outlet valves via the return line. Although the probability of this happening is low, it’s always necessary to be careful.
If the lubricating oil pump is a screw pump. 1. The operator on duty inside opens the valve that allows the backup pump to return oil to the tank, while the operator on duty outside closes the outlet valve. The system is operated for a while to check if everything is working properly. Then, the operator on duty inside slowly closes the valve that facilitates the return of oil, until the outlet pressure approaches that of the pump currently in use. 2. Two people are assigned to carry out this external operation: one slowly closes the backup return valve while the other slowly opens the outlet valve of the backup pump, to ensure stable oil pressure. 3. One person slowly opens the pump return valve, while another person slowly closes the outlet valve to maintain stable oil pressure. Then it can be stopped at the pump transfer. The internal control system can bypass the oil pressure interlock. Open the pump outlet valve and close the return valve; set the logic to automatic.