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Content DescriptionThis 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.Subscription InformationMADCAD.com ASME Standards subscriptions are annual and access is single concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office locations & multiple concurrencies on ASME Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASMEASME is a not-for-profit membership organization that enables collaboration, knowledge sharing, career enrichment, and skills development across all engineering disciplines, toward a goal of helping the global engineering community develop solutions to benefit lives and livelihoods. Founded in 1880 by a small group of leading industrialists, ASME has grown through the decades to include more than 130,000 members in 158 countries. Thirty-thousand of these members are students. From college students and early-career engineers to project managers, corporate executives, researchers and academic leaders, ASME's members are as diverse as the engineering community itself. ASME serves this wide-ranging technical community through quality programs in continuing education, training and professional development, codes and standards, research, conferences and publications, government relations and other forms of outreach. |
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