Regarding the lubrication of the pistons and packing in reciprocating units, is it necessary to involve interlocks? If so, what are the interlock voting rules...
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Lubrication of the pistons and packing in the reciprocating units of hydrogenation plants: 1. Is it necessary to use oil for lubrication? Are there any pistons and packing that do not require oil? Are there any oil-free models? How is it performing in practice? Are there any of you who don’t use oil? 2. Is it necessary for oil injection to be involved in interlocking? If so, how are the interlocking voting conditions determined? At what point does interlock shutdown occur if no oil is added for a certain number of minutes, and how is the starting time calculated? How can it be designed to serve as a warning mechanism without causing the buzzer on the SIS auxiliary control panel to keep ringing? 3. What are the disadvantages of not applying oil, and what are the drawbacks of applying oil?
For oiling, there are dedicated oilers; these oilers are equipped with pulse signal monitors to track their operation. If no oiling takes place for 5 consecutive minutes and no pulse signals are detected, the system will shut down automatically. It’s okay if some oiling points do not function properly – just adjust them promptly. Each lubrication point has two oiling points, so it’s fine if one of them does not work temporarily.
Lubrication of the piston and packing in reciprocating units requires inclusion in interlocks
The compressor we use requires oiling； The main purpose of lubricant is to act as a lubricant ； I haven’t heard of any compressors that don’t require fuel for now ； There is an interlock between the compressor and the fueling system in our equipment ； Interlocking is the operation signal of the oil injection pump ； If the oil injection pump stops operating for 60 seconds, the compressor will not be able to start when it is turned on if the oil injection pump does not start ；
Oil-free lubrication means that no lubricating oil is injected into the cylinder, while oil-lubricated systems have oil injection points in the cylinder. We have both types here: some systems are equipped with an oil injector, while others do not. Oil is injected using the injector, and we have not implemented any interlocks for this process. However, our oil filler often breaks down and fails to retain oil for short periods; it’s not a major issue. Our repair technicians are fast; in the fastest cases, two of them can fix it in about 60 seconds.
1. This depends on the design; some compressors are designed for oil-free lubrication, in which case no oil needs to be added. 2. It’s okay if oil injection is interrupted for a short period of time; nowadays, temperature monitoring is available. It’s better not to link oil injection to the shutdown mechanism of the unit, as that just creates unnecessary problems. The failure rate of oil injectors is relatively high, resulting in unplanned shutdowns from time to time – writing analysis reports on such incidents can be quite challenging. 3. Over time, oil lubrication can lead to carbon buildup, especially on the cylinders and valves where it becomes quite dirty. I’ve never worked with oil-free lubrication; I guess the wear resistance of moving parts would be lower in such cases.
Compressors that use dry, oil-free lubrication can be used, or they can be modified accordingly. As for the disadvantages of using oil-based lubrication, it mainly lies in the fact that the lubricating oil leaks into the process medium, causing contamination; in severe cases, this can also affect the operation and functionality of certain components~~
Reciprocating units are available in oil-lubricated and oil-free versions. The oil injectors used by smaller manufacturers tend to develop various minor problems over time; it is not recommended to use them in chain systems, but alarms can be set up.
If no oil is added for a short period of time, it only causes greater wear on the vulnerable components; it has little impact on the piston rod and the piston. I can’t stand sudden stops in a chain. Moreover, the problem will be resolved even without oiling for one to two hours. If a single oiling point fails to supply oil, it’s easy to replace it with a spare one; the injector will stop working, and there’s enough time to shut down the machine.
There is no need for a chain system, as 3–5 drops per minute are sufficient to lubricate the piston and packing. The oil injectors are usually set to their minimum setting, yet they still deliver around 15 drops per minute. Modern piston rings and packings consist of PTFE rings along with inkjet coatings, which provide self-lubrication