49 C.F.R. § 230.71 Orifice testing of compressors.
Title 49 - Transportation
(a) Frequency of testing. The compressor or compressors shall be tested for capacity by orifice test as often as conditions may require, but not less frequently than once every 92 service days. (b) Orifice testing criteria. (1) Compressors in common use, as listed in the following table, shall have orifice test criteria as follows: (2) For compressors not listed in the table in paragraph (b)(1) of this section, the air pressure to be maintained shall be no less than 80 percent of the manufacturer's rated capacity for the compressor.
Title 49: Transportation
PART 230—STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS
Subpart C—Steam Locomotives and Tenders
Brake and Signal Equipment
§ 230.71 Orifice testing of compressors.
---------------------------------------------------------------------------------------------------------------- Diameter of Air pressure Make Compressor size Single strokes orifice (in maintained (in per minute inches) pounds)----------------------------------------------------------------------------------------------------------------Westinghouse.......................... 9\1/2\.................. 120 \11/64\ 60Westinghouse.......................... 11...................... 100 \3/16\ 60Westinghouse.......................... 150 CFM 8\1/2\ CC....... 100 \9/32\ 60Westinghouse.......................... 120 CFM 8\1/2\.......... 100 \15/64\ 60New York.............................. 2a...................... 120 \5/32\ 60New York.............................. 6a...................... 100 \13/64\ 60New York.............................. 5b...................... 100 \15/64\ 60----------------------------------------------------------------------------------------------------------------Note: This table shall be used for altitudes to and including 1,000 feet. For altitudes over 1,000 feet the speed of compressor may be increased 5 single strokes per minute for each 1,000 feet increase in altitude.
