What is the function of flushing oil? How to conduct inspections
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What is the function of flushing oil? How to conduct inspections
The flushing oil for the catalytic unit is catalytic diesel; its main function is to flush equipment such as heavy oil pipelines and heat exchangers, and it is not in use during normal production. The main task is to carry out proper anti-freezing measures for the oil pipelines during winter.
The flushing oil for instruments is used to clear the pressure transfer tubes in case of instrument failures; it is not needed under normal conditions, so there is no need for inspections!
For catalytic units: the washing oil and combustion oil are part of the same system; they are only used during shutdowns for the heavy oil line, the heavy oil heat exchanger, and the heater top line, and are generally not used under normal operating conditions.
The flushing oil for catalytic units is used to clean pumps such as those for slurry and feedstocks. During startup, it is employed for heating the regenerator; under normal operations, it serves as seal oil for certain hot oil pumps. The flushing oil in hydrocracking units is also used to clean pipelines and pumps that handle heavy media, as well as as seal oil for some pumps
It is used for flushing heavy oil with high viscosity; during normal production, it is cut open
As the name implies, heavy oil heat exchangers, pumps, and pipelines use flushing oil to clean and displace the heavy oil inside them. It is mainly used before shutting down for purging, or before repairing pumps. Instrument flushing oil is mainly used to flush the instrument pressure leads when calibrating the oil levels (such as the liquid level at the bottom of a distillation tower or the liquid level in reprocessing tanks).
Diesel is used as the flushing oil. This flushing oil serves to fill the pressure transduction wires of instruments with an anti-freezing isolation fluid, to purge the measurement pipelines of instruments, and to keep these pipelines unobstructed, thereby ensuring the accuracy and reliability of instrument measurements. By using a flushing oil system, traditional steam heating can be eliminated, reducing daily maintenance tasks.
Flushing oil generally serves two purposes: it is used as flushing oil for instruments, and also as flushing oil for pipelines. The instrument flushing oil is suitable for calibrating instruments that use heavy oil; if the pressure tubes of the instruments become blocked, the flushing oil pump can be turned on to use the flushing oil to clear these tubes. Therefore, it is sufficient to start the pump each time an instrument is calibrated, and no extensive inspection is required ； When used as a pipeline flushing oil, as mentioned above, it is employed in heavy oil pipelines, or to displace heavy oil before the maintenance of heat exchangers and pumps, or before shutting down operations – for example, in catalytic slurry pumps and slurry pipelines.
For instrument flushing, light oils with a high freezing point are generally used, such as diesel and glycerin
The depressurization of his flushing oil serves the same purpose as circulation. In addition to what was mentioned above, there is another advantage: at high temperatures at the bottom of the depressurization tower, the viscosity of the residue oil increases, making it prone to coking and decomposition. Rinsing can, to some extent, slow down the rate of coking
When instruments, equipment, and pipelines suffer from blockages or other faults, it is generally used for flushing purposes to clear them and ensure accurate measurement during normal operation.
For the sealing of mechanical pumps with dirty media, flushing oil (usually diesel) is used; when selecting it, attention must be paid to the flow rate, pressure, and liquid level of the flushing oil