Delayed coking oil discharge pump
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We have a 100-unit delayed coking unit, and reciprocating pumps are used for the oil drainage pumps; these pumps often experience vacuum conditions. I would like to ask what kind of pumps you use? How can a reciprocating pump be operated so as to avoid vacuum formation?
That shouldn’t be the case; reciprocating pumps shouldn’t have this problem. Could it be an issue with the check valve? We use centrifugal pumps without any problems. Either the pre-heating of water in the initial stage is severe, or such a problem would not occur.
A reciprocating pump is the best type of pump; other pumps are more prone to cavitation when there is water in the medium.
Reciprocating pumps are the best; it’s not due to the presence of water – a small amount of water does not affect their operation
We use a steam reciprocating pump here.
Possible reasons for finding time: 1. The inlet filter or inlet pipeline is clogged or obstructed. 2. A low temperature or high viscosity of the oil medium causes sticking of the valve covers at the outlet or inlet of the reciprocating pump; when the piston moves back and forth, the backflow of the medium fails to provide any damping effect. Piston connecting shaft came off 4. The reciprocating speed is too high, preventing the inlet and outlet valve covers of the reciprocating pump from closing and opening in a timely manner
First, check the ingress filter. If there are no issues with the material flowing into the pump inlet, observe the operation of the pump to determine how many cylinders are actually doing work (feel the temperature of each cylinder by hand). Closing the manual valve on the inlet or outlet of the standby pump can prevent backflow in case there is a problem with the check valve of the other pump. If that doesn’t work, the check valve can be disassembled to check whether there is anything stuck inside that is blocking it; additionally, the wear on the cylinder body and the piston rings should also be inspected! I hope you can resolve the issue as soon as possible!
If reciprocating pumps are severely evacuated, centrifugal pumps will become even less usable. We have used both reciprocating and centrifugal pumps; the trick to avoid evacuation is to feed oil with a preheating temperature below 180°C into the air separation tower. Once the temperature rises, switch to the oil dumping tank.