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Yesterday,night While working first time on the ammonia plant startup.I was confronted with a question.LTS guard bed was cold and we were warming up with hot natural gas stream from front end of the plant.We realised it was taking painstakingly long.We were into it 2 days already.Bed profile looked like this 300 deg F at the top 250 deg F at the middle and 170 deg F at the bottom.I was asked if we could use a slip stream of main process gas to warm up the LTS catalyst.Process gas here being HTS effluent.I would like to know how can I calculate at what temperature the steam will start to condense at different pressures and different steam to gas ratios.The back pressure on the bed was 100 psig .Normally the bed operates at 400 psig and steam to gas ratio is 4.