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ASME PTC-46-2015 pdf download

ASME PTC-46-2015 pdf download.Overall Plant Performance.
1-1 OBJECT The object of this Code is to provide uniform test methods and procedures for the determination of the thermal performance and electrical output of heat-cycle electric power plants and cogeneration facilities. This Code provides explicit procedures for the deter- mination of the following performance results: (a) corrected power (b) corrected heat rate or efficiency (c) corrected heat input Tests may be designed to satisfy different goals, including specified unit disposition, specified corrected power, and specified measured power. 1-2 SCOPE 1-2.1 General Scope This Code applies to any plant size. It can be used to measure the performance of a plant in its normal operating condition, with all equipment in a clean and fully functional condition. This Code provides explicit methods and procedures for combined cycle power plants and for most gas, liquid, and solid fueled Rankine cycle plants. There is no intent to restrict the use of this Code for other types of heat cycle power plants, providing the explicit procedures can be met. For example, the performance equations and test methods herein are applicable to the steam cycle portion of a solar plant, or of a nuclear plant steam cycle. Refer to ASME PTC 47 for power block thermal performance test procedures associated with an IGCC plant (Integrated Gasification Combined Cycle). This Code does not apply to component testing, for example, gas turbines (ASME PTC 22) or steam turbines (ASME PTC 6 or ASME PTC 6.2) or other individual components. To testa particular power plantor cogener- ation facility in accordance with this Code, the following must be met: (a) a means must be available to determine, through either direct or indirect measurements, all of the heat inputs entering the test boundary and all ofthe electrical power and secondary outputs leaving the testboundary; 1 (b) a means must be available to determine, through either director indirectmeasurements, all ofthe parame- ters to correct the results from the test to the base refer- ence condition; (c) the test result uncertainties should be less than or equal to the uncertainties given in subsection 1-3 for the applicable plant type; and (d) the working fluid for vapor cycles must be steam. This restriction is imposed only to the extent that other fluids mayrequire measurements ormeasurementmeth- ods different from those provided by this Code for steam cycles. 1-2.2 Tests Outside the Scope of ASME PTC 46 Tests addressing other power plant performance- related issues are outside the scope of this Code. These include the following: (a) emissions tests: testing to verify compliance with regulatory emissions levels (e.g., airborne gaseous and particulate, solid and wastewater, noise, etc.), or required for calibration and certification of emission- monitoring systems. (b) operational demonstration tests: the various stan- dard power plant tests typically conducted during start- up, or periodically thereafter, to demonstrate specified operating capabilities (e.g., minimum load operation, automatic load control and load ramp rate, fuel switch- ing capability, etc.). (c) reliability tests: tests conducted over an extended period of days or weeks to demonstrate the capability of the power plant to produce a specified minimum output level or availability. The measurement methods, calculations, and corrections to design conditions included herein may be of use in designing tests of this type; however, this Code does not address this type of testing in terms of providing explicit testing procedures or acceptance criteria. 1-3 TEST UNCERTAINTY The explicit measurement methods and procedures have been developed to provide a test of the highest level of accuracy consistent with practical limitations.
The largest allowable test uncertainties (as a percent of test results) for selected power plant types are given in Table 1-3-1. It is recognized there is a diverse range of power plant designs that cannot be generally categorized for purposes of establishing testing methods and uncer- tainty limits. The uncertainty levels achievable from test- ing in accordance with this Code are dependent on the plant type, specific design complexity, and consistency of operation during a test. For example, because of the wide range of process mass and energy flows, and the locations for their extraction, uncertainty limits for cogenerators cannot be so generalized. Testing with cogeneration efflux may increase the test uncertainty, the amount of which depends on the location in the cycle and the relative amountofthe cogenerationenergy. The special cases in paras. 5-5.2 and 5-5.3 are also not considered in Table 1-3-1. The values in Table 1-3-1 are not targets. A primary philosophy underlying this Code is to design a test for the highest practical level of accuracy based on current engineering knowledge. If the test is for commercial acceptance, this philosophy is in the best interest of all parties to the test. Deviations from the methods recom- mended in this Code are acceptable only if it can be demonstrated they provide equal or lower uncertainty.

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