Section 408.4511. Nonvaporizing organic fluid boilers.

(1) A nonvaporizing organic fluid boiler is a boiler designed to heat, but not vaporize, a fluid in a closed system.

(2)       The owner shall ensure that a nonvaporizing organic fluid boiler is constructed pursuant to the ASME boiler and pressure vessel code.

(3)       The owner shall ensure that stop valves are located at an accessible point in the supply and return pipe connections as near the boiler as is practicable.

(4)      The owner shall ensure that a nonvaporizing organic fluid boiler has the following minimum equipment:

(a)     A relief valve of sufficient capacity to relieve the excess thermal fluid as a result of thermal expansion verified by engineering calculations provided by the owner or user to the inspector.

(b)          A thermometer graduated to not less than 133% of the expected operating temperature.

(c)         A pressure gauge graduated to not less than 150% of the expected operating pressure.

(d)    A low level or flow sensing device suitable for operating conditions.

(5)      The owner shall ensure that the installation, maintenance, operation, and testing of controls and safety devices is pursuant to R 408.4027.

(6)        Expansion tanks for closed systems designed to operate above 30 psi shall be constructed pursuant to ASME Section VIII, Division 1, meeting at least the pressure and temperature ratings of the system.

History: 1998-2000 AACS; 2006 AACS; 2013 AACS.