42 CFR 84.146 - Method of measuring the power and torque required to operate blowers.

§ 84.146 Method of measuring the power and torque required to operate blowers.

As shown in Figure 1 of this section, the blower crank is replaced by a wooden drum, a (13 cm. (5 inches) in diameter is convenient). This drum is wound with about 12 m. (40 feet) of No. 2 picture cord, b. A weight, c, of sufficient mass to rotate the blower at the desired speed is suspended from this wire cord. A mark is made on the cord about 3 to 4.5 m. (10 to 15 feet) from the weight, c. Another mark is placed at a measured distance (6-9 m./20-30 feet is convenient) from the first. These are used to facilitate timing. To determine the torque or horsepower required to operate the blower, the drum is started in rotation manually at or slightly above the speed at which the power measurement is to be made. The blower is then permitted to assume constant speed, and then as the first mark on the wire leaves the drum, a stopwatch is started. The watch is stopped when the second mark leaves the drum. From these data the foot-pounds per minute and the torque may be calculated.

Figure 1 - Apparatus for measuring power required to operate blower. ( 42 CFR part 84, subpart J, § 84.146)

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United States Code
U.S. Code: Title 29 - LABOR

Title 42 published on 15-May-2018 04:40

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 42 CFR Part 84 after this date.

  • 2018-03-22; vol. 83 # 56 - Thursday, March 22, 2018
    1. 83 FR 12527 - Clarification of Post-Approval Testing Standards for Closed-Circuit Escape Respirators; Technical Amendments
      GPO FDSys XML | Text
      DEPARTMENT OF HEALTH AND HUMAN SERVICES, Centers for Disease Control and Prevention, HHS
      Notice of proposed rulemaking.
      Comments must be received by May 21, 2018.
      42 CFR Part 84