Explosion in the diesel hydrogenation hydrogenation system
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I would like to ask the experts: as we start up the diesel hydrogenation process, the hydrogen-related systems need to be purged by blasting. Which pipelines require such blasting? How many layers of asbestos tape are needed, and what pressure does that correspond to? How should the operating pressure of the pipelines be determined, and what pressure level should be used for blasting? Are there any industry standards for blasting?
1. For the purging of the turbine inlet pipeline, the target plates should be made of aluminum sheets with a thickness of 5 mm, a width of not less than 8% of the inner diameter of the exhaust pipe, and a length slightly greater than the inner diameter of the pipe. 2. The pipeline where the cold hydrogen valve is located; 3. The gas seal tank for dry gas sealing; 4. Nitrogen purging is carried out using a new hydrogen compressor; 5. The pipeline from the compressor outlet to the hydrogen mixing point; 6. The reaction heating furnace; 7. The reactor; 8. The high-pressure venting system, which requires the use of a compressor for purging; 9. The new hydrogen pipeline; 10. The high and low pressure separation systems; 11. The tower top reflux tank; 12. The new hydrogen flare line; 13. The liquid separation tank between the stages of the new hydrogen compressor, and so on. I can’t remember everything clearly
Does it mean that no matter what purging method is used, as long as the purging acceptance criteria are met, it’s fine?
The key points need to be thoroughly purged; meeting the standards is sufficient
Blasting for cleaning has limited effectiveness in cases of small pipe diameters; it works better for pipes with a diameter of DN80 or larger. It’s also advisable to have some 3mm thick asbestos felt available. The blasting pressure should generally be kept around 0.3 MPa – higher pressures can cause excessive vibration in the pipes. Make the necessary preparations and conduct a few trial blasts to determine what works best for your specific setup. Different sizes and designs of systems lead to various situations during blasting. The most important thing is ensuring blasting safety; it’s absolutely crucial to avoid injuring anyone, as this isn’t a trivial matter