ASME PTC 12.1 2015
$98.04
ASME PTC 12.1 – 2015: Closed Feedwater Heaters
| Published By | Publication Date | Number of Pages |
| ASME | 2015 | 74 |
This Code provides the procedures, direction, and guidance for determining the performance of closed feedwater heaters with regard to the following: (a) Terminal Temperature Difference (TTD), which is the difference between the saturation temperature corresponding to the steam inlet pressure and the feedwater outlet temperature; (b) Drain Cooler Approach (DCA), which is the difference between drain outlet temperature and feedwater inlet temperature; (c) Tube side (feedwater) pressure loss through the heater; and (d) Shell side pressure loss through the desuperheating zone, and through the drain cooling zone. This Code applies to all horizontal and vertical heaters except those with partial pass drain cooling zones. Designs with partial pass drain cooling zones are horizontal heaters with submerged drain cooling zones, and vertical channel-up heaters with drain cooling zones. In those designs, only a portion of the feedwater passes through the drain cooling zones; therefore, there are two feedwater flow streams with different temperature profiles. A feedwater heater is designed to accomplish heat transfer between fluids. The heater design is based on a specific operating condition that includes flow, temperature, and pressure. This specific condition constitutes the design point that is found on the manufacturer’s feedwater heater specification sheet. It is not feasible to expect that the test will be conducted at the design point. Therefore, it is necessary to predict the heater performance by adjusting the design parameters for the test conditions. Methods of calculating the predicted heater performance are presented in the Code. These predicted values shall then be compared to corresponding measured test values.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | CONTENTS |
| 6 | NOTICE |
| 7 | FOREWORD |
| 8 | ASME PTC COMMITTEE ROSTER |
| 9 | CORRESPONDENCE WITH THE PTC COMMITTEE |
| 10 | Section 1 Object and Scope 1-1 GENERAL 1-2 OBJECT 1-3 SCOPE |
| 11 | 1-4 UNCERTAINTY |
| 12 | Section 2 Definitions and Descriptions of Terms 2-1 SYMBOLS 2-2 NOMENCLATURE 2-3 SUBSCRIPTS |
| 13 | Tables Table 2-1-1 Symbols |
| 15 | Table 2-2-1 Nomenclature |
| 16 | Section 3 Guiding Principles 3-1 ITEMS FOR AGREEMENT 3-2 PARAMETERS AFFECTING FEEDWATER HEATER PERFORMANCE 3-3 METHODS OF OPERATION DURING THE TEST 3-3.1 General 3-3.2 Heater Operation |
| 17 | 3-4 PREPARATION FOR THE TEST 3-4.1 General |
| 18 | Figures Fig. 3-3.2-1 Typical DCA and TTD Versus Heater Internal Liquid Level |
| 19 | 3-4.2 Preliminary Runs 3-5 DURATION OF RUNS AND FREQUENCY OF READINGS 3-6 STEADY-STATE LIMITS 3-7 MEASUREMENT UNCERTAINTY 3-7.1 Introduction 3-7.2 Random Error 3-7.3 Systematic Error Table 3-6-1 Deviation Limits of Parameters |
| 20 | 3-7.4 Combination of Random and Systematic Uncertainties Total Uncertainty 3-8 LOCATION OF TEST POINTS |
| 21 | Fig. 3-8-1 Three-Zone Heater Test Points: Desuperheating, Condensing, and Drain Cooling Zones |
| 22 | Fig. 3-8-2 Thermal Profile: Desuperheating, Condensing, and Drain Cooling Zones |
| 23 | Fig. 3-8-3 Two-Zone Heater Test Points: Desuperheating and Condensing Zones |
| 24 | Fig. 3-8-4 Thermal Profile: Desuperheating and Condensing Zones |
| 25 | Fig. 3-8-5 Two-Zone Heater Test Points: Condensing and Drain Cooling Zones |
| 26 | Fig. 3-8-6 Thermal Profile: Condensing and Drain Cooling Zones |
| 27 | Fig. 3-8-7 Single-Zone Heater Test Points: Condensing Zone Only |
| 28 | Fig. 3-8-8 Thermal Profile: Condensing Zone |
| 29 | Fig. 3-8-9 Single-Zone Heater Test Points: External Drain Cooler |
| 30 | Fig. 3-8-10 Thermal Profile: External Drain Cooler |
| 31 | Section 4 Instruments and Methods of Measurement 4-1 GENERAL 4-2 PRESSURE MEASUREMENT 4-3 TEMPERATURE MEASUREMENT |
| 32 | 4-4 WATER FLOW MEASUREMENT |
| 33 | 4-5 SPLIT STREAM FEEDWATER HEATER TESTING Fig. 4-4-1 Typical Transducer Installation |
| 34 | 4-6 MULTIPLE INLET STEAM NOZZLES 4-7 INSTRUMENT UNCERTAINTIES Table 4-7-1 Maximim Uncertainty Values |
| 35 | Section 5 Computation of Results 5-1 INTRODUCTION 5-2 PERFORMANCE CALCULATION PROCEDURES |
| 36 | 5-2.1 Three-Zone Heater Integral Desuperheating Zone, Condensing Zone, and Drain Cooling Zone Table 5-2.1-1 Manufacturer Design Data |
| 39 | 5-2.2 Two-Zone Heater Desuperheating and Condensing Heater |
| 42 | 5-2.3 Two-Zone Heater Condensing and Drain Cooling |
| 44 | 5-2.4 One-Zone Heater Condensing Only |
| 46 | 5-2.5 Drain Cooler Only |
| 47 | 5-3 UNCERTAINTY CALCULATION PROCEDURES 5-3.1 Calculation of Sensitivity Factors 5-3.2 Calculation of the Random Standard Uncertainty of the Result |
| 48 | 5-3.3 Calculation of the Systematic Standard Uncertainty of the Result 5-3.4 Calculation of the Combined Effect of Random and Systematic Standard Uncertainties |
| 49 | Section 6 Report of Results |
| 51 | Section 7 References |
| 52 | Table A-1-1 Nomenclature NONMANDATORY APPENDIX A BASIC HEAT TRANSFER EQUATIONS A-1 INTRODUCTION A-2 BASIC THERMODYNAMIC HEAT BALANCE FOR THE ENTIRE HEATER A-3 HEAT BALANCE FOR EACH ZONE A-4 RESISTANCES |
| 54 | A-5 BASIC PERFORMANCE ACCEPTANCE EQUATIONS A-6 PRESSURE DROP RATIOS A-7 RESISTANCE RATIOS A-8 EFFECTIVENESS/NTU METHOD |
| 55 | NONMANDATORY APPENDIX B HEATER PERFORMANCE CALCULATION EXAMPLES B-1 INTRODUCTION B-2 STEP-BY-STEP CALCULATION |
| 56 | Table B-1-1 Manufacturer Design Data Table B-1-2 Test Run Data |
| 65 | Table C-1-1 Sample Calculation Inputs For Systematic Error and Standard Deviation NONMANDATORY APPENDIX C UNCERTAINTY CONSIDERATIONS C-1 SAMPLE CALCULATION OF TEST UNCERTAINTY C-2 SENSITIVITY OF THE RESULTS TO FEEDWATER INLET TEMPERATURE MEASUREMENT UNCERTAINTY C-3 COMBINED UNCERTAINTY DUE TO ALL MEASUREMENTS C-3.1 Sensitivity C-3.2 Random Standard Uncertainty |
| 66 | Table C-2-1 Sensitivity of the Results to Feedwater Inlet Temperature Measurement Uncertainty Table C-3.1-1 Uncertainty Analysis for the Difference Between Predicted and Measured Terminal Temperature Difference (TTD) in Three-Zone Feedwater Heater C-3.3 Systematic Standard Uncertainty |
| 67 | Table C-3.1-2 Uncertainty Analysis for the Difference Between Predicted and Measured Drain Cooler Approach (DCA) in Three-Zone Feedwater Heater Table C-3.1-3 Uncertainty Analysis for the Difference Between Predicted and Measured Tube Side Pressure Loss in Three-Zone Feedwater HeaterSystematic |
| 68 | Table C-3.1-4 Uncertainty Analysis for the Difference Between Predicted and Measured Desuperheater Pressure Loss in Three-Zone Feedwater Heater Table C-3.1-5 Uncertainty Analysis for the Difference Between Predicted and Measured Drain Cooler Pressure Loss in Three-Zone Feedwater Heater |
| 69 | C-3.4 Combined Standard Uncertainty and Expanded Uncertainty |
| 70 | NONMANDATORY APPENDIX D PRINCIPAL QUANTITIES AND COMMONLY USED CONVERSION FACTORS IN HEAT TRANSFER SI UNITS |
| 71 | Table D-1 Conversion Factors |
| 73 | How can you reach us? ItŒs easier than ever! |
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