A-A-50304
a. Lubrication shall be provided means for all bearings (except sealed-for-life type). The supplier shall include and install all required lubricants, fluids, greases and other compounds in the dynamometer.
b. Safety provisions that incorporate safety devices to prevent conditions hazardous to personnel or detrimental to equipment shall be provided including and overspeed trip governor that overrides the throttle control, and either stops the engine completely or returns the engine to idle, in the event the engine speed exceeds the governor setting. The overspeed governor shall be graduated in increments not greater than 100 rpm, and shall be adjustable through a 2,000 to 5,000 rpm engine speed range. The governor speed selector shall be panel mounted on the control console.
c. Parts shall be replaceable and adjustable without modification of the part or the dynamometer.
2. Product description. The dynamometer shall consist of:
a. Power absorption system with:
(1) Power absorber capable of continuously absorbing the following horsepower values at the revolutions per minute (rpm) without exceeding a water consumption rate of 4.5 gallons per horsepower hour.
20HP at 600 RPM ± 50 RPM
160HP at 1200 RPM ± 100 RPM
335HP at 1800 RPM ± 100 RPM
500HP at 2300 RPM ± 100 RPM
200HP at 5000 RPM ± 100 RPM
The minimum controllable HP curve shall not exceed the following:
10HP at 2000 RPM ± 100 RPM
dddd 140 HP at 5000 RPM ± 100 RPM
Power absorbers of either hydraulic, eddy current, or electric generator type with bi-directional rotation are acceptable.
(2) Power absorber frame designed for at least 20,000 hours of operation without failure or degradation of dynamometer accuracy and a frame that provides support for the power absorber.
(3) Dynamometer cooling temperature controls with:
(a) Automatic temperature controls with manual override adequate for maximum rated power absorption.
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