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How to design equipment for reduced-pressure explosion structural integrity when Kst and dP/dt max are not known?

Question asked by pd1122 on Oct 17, 2017

We are an OEM of industrial processing equipment such as crushers, mills, and feeders.  We often quote and supply equipment for use with combustible materials such as coal.  Occasionally, our customers request that our equipment have some level of reduced-level explosion resistance, e.g. explosion vents of some other measure will be used to reduce the full force of an explosion to some level of Pred.  The customer wants our equipment to maintain its structural integrity if a reduced-level explosion occurs.


However, our customers almost never can provide us with the values of Kst and dp/dt max.  In some cases, our customer is an EPC that does not have access to these details from the end user.  In other cases, the customer has simply never had their coal characterized.


We would like to be able to design to one set of “worst case coal” explosibility parameters – instead of evaluating each customer’s coal individually.  Is this a reasonable approach:  to artificially create a “worst case coal”, choosing the highest known values of Kst and dP/dt max historically measured and use those values with a given value for Pred?  Thus, designs based on this "worst case coal" would be suitable for any other coal with lesser values of Kst and dP/dt max, at a given level of Pred.  Have any other OEM’s encountered this issue?


Thank you.