The object of this ASME Code is to provide a test procedure for evaluating the performance of waste fuel combustors with energy recovery using the boiler as a calorimeter. These procedures apply when the variability and waste fuel composition results in a lack of confidence in obtaining representative samples for laboratory analysis. This Code is used to determine: (a) The thermal efficiency of system combusting waste fuels (b) The thermal capacity (heat input per unit time) of systems combusting waste fuels (c) The higher heating value (HHV) of waste fuels. The rules and instructions given in this Code apply to all waste combustor systems with energy recovery, but the code cannot detail a test applicable to every variation in the design of waste combustor systems. In every case, a qualified engineer must study the particular facility and develop a test procedure, which is in agreement with the intent, guiding principles and required accuracy of this Code. Examples of systems considered at the time of preparation of this code include rotary kilns, refractory and waterwall furnaces, rotary combustors, mechanical grates, semi-suspension and suspension burning, multiple chamber solid hearth, and two stage combustion systems. Portions of this Code may be used for Waste Combustors w/o energy recovery in the area of unburned combustibles in residue Testing of accessory equipment shall be performed using the applicable performance test code. Refer to Fig. 1-2-1 for a typical system boundary. Test methods of this code apply to solid, liquid, or gaseous waste fuels. Instructions are given to determine the thermal capacity and thermal efficiency of waste combustor systems by applying the concept of using the boiler as a calorimeter. In addition, the HHV of the waste fuel can be determined by weighing the waste fuel that has been consumed during the test.