I have a "silly" question regarding the allowable for the API 661 air cooler. We ask the vendor for increased factor for allowable nozzle loads on several air coolers, they will agree for 3 times factor according API 661.
The question is, this factor should apply for all three paragraph 7.1.10.1 (individual nozzle), 7.1.10.2(header combination) and 7.1.10.3(multi-bay combination)?
Or this factor should apply only for paragraph 7.1.10.1, individual nozzle loads and for the rest the allowable should be " 1x API661 ".