The stainless steel feedwater heater specifications, ASTM A688/ASME SA 688 and ASTM A803/SA 803, were developed over 30 years ago. At that time, no one envisioned the temperatures and pressures that today's super and ultra-critical units would operate. The increased pressures, temperatures, and expectations for reliability require special manufacturing techniques and testing for long tube life. The current ASTM/ASME specifications should be considered minimum requirements, and for long term reliability a number of additional special manufacturing processes and tests are essential. This paper summarizes many of the manufacturing and testing choices that should be specified to ensure high reliability. It identifies the advantages and disadvantages of each option and provides suggestions on what should be specified to ensure a reliable cost-effective feedwater heater tube for today's applications.
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机译：30年前，不锈钢供给水加热器规格，ASTM A688 / ASME SA 688和ASTM A803 / SA 803开发。那时，没有人设想了今天的超级和超临界单位的温度和压力。增加的压力，温度和可靠性期望需要特殊的制造技术和测试长管寿命。目前的ASTM / ASME规范应被视为最低要求，并且对于长期可靠性，许多额外的特殊制造工艺和测试是必不可少的。本文总结了应规定的许多制造和测试选择，以确保高可靠性。它确定了每个选项的优缺点，并提供了对当今应用程序可靠的经济高效的供水加热器管的指定建议。
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