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Code of Federal Regulations Title 49. Transportation § 49.230.71 Orifice testing of compressors

Current as of January 02, 2025 | Updated by Findlaw Staff

(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․․․․․․․․․․

9 1/2․․․․․․․․․․․․․․․․․․

120

11/64

60

Westinghouse․․․․․․․․․․

11․․․․․․․․․․․․․․․․․․․․․․․

100

3/16

60

Westinghouse․․․․․․․․․․

150 CFM 8 1/2 CC․․․․․․․

100

9/32

60

Westinghouse․․․․․․․․․․

120 CFM 8 1/2․․․․․․․․․․

100

15/64

60

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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Cite this article: FindLaw.com - Code of Federal Regulations Title 49. Transportation § 49.230.71 Orifice testing of compressors - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-49-transportation/cfr-sect-49-230-71/

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