Problems with blasting and purging during the commissioning of hydrogenation units
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A new hydrogenation unit needs to be put into operation, but the details are not clear. When performing blasting and purging of the hydrogen supply system before starting up the unit, into how many stages should this process be divided? Does the blasting purge entering the feed heat exchanger, along with air cooling, have an impact on the blasting effect? I would appreciate the guidance of experts
The specific process of blasting purging is divided into several stages, which are not fixed. Blasting purging is suitable for applications with low gas flow rates and large pipe diameters, where open-pipe purging fails to achieve thorough cleaning due to low pressure. Entry to the equipment is not allowed per requirements, but it was entered during the actual purging. The impact is that foreign debris gets into the equipment and cannot be blown out, and as the equipment operates, this debris ends up inside it and damages it.
Generally, there is no specific definition regarding how many segments it should be divided into; it is determined based on the effects of the blasting. Connecting the device is not recommended.
It won’t be very clear; in hydrogenation reaction systems, most of the pipelines are welded together, so it’s sufficient to carry out blasting at the few accessible points where disconnection is possible, such as the reactor inlet, the inlet and outlet of the circulator, etc. Experience with both hydrogenation and hydrocracking is available; feel free to share your insights
For wax oil hydrogenation, do you purge the equipment while doing the cleaning? If possible, could you leave a contact method?
If the device is a welded flange and it’s not possible to isolate it without using a bypass line, how should this be resolved?