ANSI/ISA-77.13.01-1999 - Fossil Fuel Power Plant Steam

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Extra info for ANSI/ISA-77.13.01-1999 - Fossil Fuel Power Plant Steam Turbine Bypass System

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But no rules for this have been set. The advantage of using DIN 3840 is the implicit time element that goes into the analysis and makes a statement about the expected lifetime. ASME Code Case 1331 provides guidelines for the calculations of the cyclic lifetime of, for example, turbine bypass valve bodies (low cycle fatigue). These values have been used extensively over many years and are particularly important for the design of HP bypass and trip valves with very short stroking times. Utility people generally expect a turbine bypass to last 20 to 25 years.

The first takes the “cookbook approach” by providing easy-to-use tables for determining the required wall thicknesses. The latter requires the engineer to perform an accurate stress analysis by using the so called “pressure area comparison method” (the flow area versus the pressure containing section area). This approach is similar to ASME Section 3, Nuclear Valves. 1B, according to DIN 50049, and the creep rupture value at the design temperature (example 1000°F) for an expected lifetime of 100,000 or 200,000 hours.

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