Just play it at half speed and you're golden.
If there isn't a 20kHz tone on the 30ips tape (plays back at 10kHz at 15), you'll be aligning the HF playbeck eq at 5kHz from the "10kHz" tone, which isn't ideal, so you'll wnat to do a HF sweep while in the record calibration phase and make fine adjustments there.
Otherwise, it's normal procedure.