The equipment vendor should be asked the question about the allowable loads.
If the allowable loads are part of the client's design criteria they should be discussed with both parties.
The client should specify applicable "occasional" events that need to be considered in the design of the specific plant.
Use of the snubbers should be avoided IF POSSIBLE. Decision about the use of snubbers should come from the competent design engineer and based on all of the above (design criteria, criticality of the piping system, operating practices and expected climatic / seismic conditions).
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Regards
Ranka