Flammable gases can be analyzed before hot work; how can flammable dust be analyzed and determined?

It can be analyzed manually or using instruments. There are combustible gas detectors and dust detectors available for selection. Of course, it can also be measured using the partitioning method.

There were cases of PTA (terephthalic acid) dust explosions; it was considered a Class 1 hot work operation at the time, the flammable gas levels were within acceptable limits, and the safety department gave its approval, yet an explosion occurred anyway, resulting in one person suffering severe burns.

This could be an explosion caused by the uniform distribution of dust and the static electricity generated between the particles; the time period for analyzing the flammable gases is also very important.

2# chengjingbao, could you explain it in more detail? Thank you

The fire hazard analysis in our workshop due to silicon powder also relates to dust

How detailed do you want it? Do you still want to hear my judgment on the origin of his explosion? What I wanted to say earlier is that this PTA material seems safe on the surface, but dust explosions can still occur in such environments. Coincidentally, the level of combustible materials present there is already above the threshold, though not by much. An explosion is possible only in semi-enclosed spaces, as it is in such areas that the dust can be distributed more evenly, and the concentration of combustible materials must be high enough ； If it explodes in an open area and the levels of flammable materials are within normal limits, there are only two possibilities: either it wasn’t detected ； Second, there is a problem with the analytical instrument ； This issue can also be divided into two types: one is a problem with the instrument, and the other is a problem with the selection of the appropriate model ； Personal opinion.