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CFR > Title 49 - Transportation > SUBTITLE B—Other Regulations Relating to Transportation > CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (Parts 200–269) > PART 230—STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS > SUBPART C—Steam Locomotives and Tenders (§230.66 to §230.116) > 230.71—Orifice testing of compressors.

230.71—Orifice testing of compressors.

(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:
Make Compressor size Single strokes per minute Diameter of orifice(in inches) Air pressure maintained(in pounds)
Westinghouse 91/2 120 11/64 60
Westinghouse 11 100 3/16 60
Westinghouse 150 CFM 81/2 CC 100 9/32 60
Westinghouse 120 CFM 81/2 100 15/64 60
Code of Federal Regulations 505
New York 2a 120 5/32 60
New York 6a 100 13/64 60
New 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.
(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.




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