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omponent design limit. Examples of component design limits are as follows: (a) a requirement that a single heat exchanger was 9 ACCEPTANCE CRITERIA Acceptance criteria consists of the following three designed to transfer a specific amount of heat (b) a requirement that a single heat exchanger was designed for operating with a specified pressure drop types of limits: 178 ASME OM-2009 PART 21 (STANDARDS) 9.3 Required Action Limits Required action limits shall be established for each heat exchanger to allow corrective action to be taken prior to exceeding the system asme pdf operability limit. Required action limits are based on the known fouling (or other degradation) rate, as determined by parameter trending (see para. 6.10), after applying a 95% confidence level to the data. This 95% confidence level is determined based on the total uncertainty calculated for the test or monitoring result (see section 8 and Fig. 1). Required action limits shall be used to ensure heat occurred more rapidly than expected, then other heat exchangers should be evaluated according to the follow- ing priority:
(a) Evaluate those heat exchangers that are known to have the least margin.
(b) Evaluate those heat exchangers that are asme pdf likely to have been subject to the same fouling (or degradation) mechanism.
(c) Evaluate those heat exchangers that are next on the existing schedule. exchanger operational readiness throughout the entire 11 RECORDS AND RECORD KEEPING interval of testing or monitoring (see para. 5.4). 11.1 Equipment Records 10 CORRECTIVE ACTION A record shall be maintained that contains the follow- ing information for each heat exchanger covered here: Corrective action (flushing, mechanical cleaning, chemical cleaning, mechanical repair, etc.) shall be per- formed following failure to meet the acceptance criteria as defined in section 9, or whenever I (test) exceeds I (max.), as described in Fig. 1. As part of this corrective action, the root cause of the failure should be determined (see Nonmandatory Appendix A of this Part). Unless the effectiveness of the corrective action
