Indirect fired vaporizers shall be equipped with the following safeguards:
1. The device that supplies the necessary heat for producing steam, hot water, or other heating medium shall be separated from all rooms containing vaporizers, pumps, and central gas mixing devices by a vapor-tight one-hour fire- resistive separation.
2. Gas-fired heating systems supplying heat exclusively for vaporization purposes shall be equipped with automatic safety devices to shut off the flow of gas to main burners, if pilot light should fail.
3. A shut-off valve shall be installed on the liquid line to the vaporizer unit outside of any vaporizer room or building.