ASME PTC-30.1-2007 pdf download

ASME PTC-30.1-2007 pdf download.Air-Cooled Steam Condensers.
1-1 OBJECT This Code provides uniformtestmethods for conduct- ing and reporting thermal performance characteristics of mechanical draft air-cooled steam condensers (ACC) operating under vacuum conditions. This Code provides explicit test procedures to yield results of the highest levels of accuracy consistent with the best engineering knowledge taking into account test costs and the value of the information obtained from testing and practice currently available. This Code pro- vides rules for conducting acceptance tests. It also pro- vides guidelines for monitoring thermal performance and conducting routine tests. The tests can be used to determine compliance with contractual obligations and the Code can be incorpo- rated into commercial agreements. Atestshallbe consid- ered an ASME Code Test only if the test procedures comply with those stipulated in this Code and the post- test uncertainty analysis results are in accordance with subsection 1-3. 1-2 SCOPE This Code provides rules for determining the thermal performance of the referenced equipment with regard to the steam flow capability while meeting any applica- ble fan power guarantees. This steam flow capability may be alternatively expressed as a deviation from design flow capability, a deviation from design turbine backpressure, or as the absolute value of the steam tur- bine backpressure. This Code also provides procedures for assessing compliance to specified dissolved oxygen and specified condensate temperature. This Code does not address procedures for assessing noise. The Code is not intended for tests of (a) devices for which the process fluid is above atmo- spheric pressure (b) devices for process fluids other than steam (c) devices for single-phase process fluids (d) wet surface air cooled condensers (e) natural draft or fan-assisted air cooled condensers 1 (f) air-cooled condensers with inlet air conditioning in-service The determination of special data or verification of guarantees that are outside the scope of this Code shall be made only with the written agreement of the parties to the test. The agreed methods of measurement and computation shall be defined in writing and fully described in the test report. 1-3 UNCERTAINTY The explicit measurement methods and procedures have been developed to provide a test of the highest level of accuracy consistent with practical limitations for acceptance testing. Any departure from Code requirements could introduce additional uncertainty beyond thatconsidered acceptable to meetthe objectives of the Code. The application of uncertainties to adjust test results is not part of this Code; the test results themselves pro- vide the best indication of actual performance. The uncertainty is used to determine the quality of the test and reflects the accuracy of the test instrumentation and stability of the test conditions. Test tolerance, margin, and allowance are commercial matters that are not addressed by this Code. The maximum uncertainties shown below are lim- its — not targets. A Code precept is to design a test for the highest practical level of accuracy based on current engineering knowledge. For a commercial test, this phi- losophy is in the best interest of all parties to the test. Deviations from the methods stated in this Code are acceptable only if it can be demonstrated to the test parties that the deviations provide equal or lower uncer- tainty in the calculated test result. A pretest uncertainty analysis shall be performed to establish the expected level of uncertainties for the test, including an estimate of the random (precision) uncer- tainty based on experience. A post-test uncertainty analysis is similarly required. The results of a thermal performance test, conducted in full compliance with the procedures and instrumenta- tion specified in this Code, shall be considered valid if  the calculated overall uncertainty in the thermal capabil- ity is less than ±4.0%. If the post-test uncertainty is greater than ±4.0%, then the test is not a Code test. In addition, the uncertainty of Code tests that determine the condensate temperature shall be less than ±0.3°C and Code tests that measure the dissolved oxygen in the condensate shall have an uncertainty of less than ±2.6 ppb. Because of the variety of methods and instruments used in the conduct of performance tests, the test uncer- tainty must be determined by an uncertainty analysis 2 based on ASME PTC 19.1 but specifically applied to the equipment indicated within this Code. It should be noted that the collection, reduction, and evaluation of thermal data are greatly facilitated through the use of a data acquisition system. The use of a data acquisition system is preferable to a manual recording system because a data acquisition system supports increased sampling frequency, increased number of test measure- ments, and the ability to scan more instruments that in combination will reduce the random error in the measurements.