I understand that the code gives you some credit for natural draft cooling on a fan failure. However, I have a hard time seeing how this is applicable in a fire case, since your ambient air temperature will be much higher than normal.
API RP 521 Section3.15.7.2 This section refers air cooled exchangers in condensing service. An alternate heat flux value of 12,000 is given to use in place of the standard value of 21,000. Is this value only good for condensing service exchangers? Or can it also be used in a liquid...