An American National Standard. The American Society of Mechanical Engineers (ASME). Revision of ASME/ANSI PTC 19.11-1970. Date of Issuance: October 10, 1997. 65p. The Object of this Supplement is to specify and discuss the methods and instrumentation for testing boiler make-up and feedwater, steam, and condensate in relation to performance testing as may be required in Performance Test Codes in one-time acceptance testing and in continuous performance monitoring.