§ 13.203. Drying apparatus.
(a) If the drying is done on small drying hand trays the heating elements shall be so arranged that the material to be dried or the dust cannot come in direct contact with them. The temperature in the drying chambers shall not exceed 60 C. All drying apparatus shall be so constructed that the gases escape easily without dangerous pressure if the trinitrotoluol should ignite.
(b) If the drying is done in large drying pans, hot water or low pressure steam at not over 20 pounds pressure per square inch shall be employed for heating. The contents shall be kept in constant motion and the apparatus constructed to prevent the escape of vapors into the workroom.
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