Answers to these questions are often obtained from the internal team. For example, a team member such as a maintenance manager who periodically inspects a vessel or pipe should be able to disclose whether he or she finds dust clinging to the walls. An engineer can provide information for exactly how an area of the process is designed. Or a machine operator may be aware of a leak or upset in the process when it is turned on, and likely can describe the different states of the process.
Therefore, relying on institutional knowledge and documentation will usually provide enough information to understand where problem areas exist.
When necessary, certain tests may be required. For example, a particle size test can help determine how much dust separates from a material when it enters a specific part of the process, which of course will affect its combustibility.