Temperature rise in a hot oil system during the period that the refractory is drying out is allowed at a rate of
a) not more than 55 degrees Celsius per hour
b) not more than 65 degrees Celsius per hour
c) not more than 45 degrees Celsius per hour
d) not more than 75 degrees Celsius per hour
e) not more than 100 degrees Celsius per hour
Answer: A