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1926.1001(f)(2)(i)
The energy requirement for purposes of meeting the requirements of paragraph (e)(1) of this section is to be determined by referring to the plot of the energy versus weight of vehicle (see Figure W-6 for rubber-tired self-propelled scrapers; Figure W-7 for rubber-tired front-end loaders and rubber-tired dozers; Figure W-8 for crawler tractors and crawler-type loaders; and Figure W-9 for motor graders). For purposes of this section, force and weight are measured as pounds (lb.); energy (U) is measured as inch-pounds.

FIGURE W-6 - Energy absorbed versus vehicle weight.


FIGURE W-7 - Energy absorbed versus vehicle weight.


FIGURE W-8 - Energy absorbed versus vehicle weight.


FIGURE W-9 - Energy absorbed versus vehicle weight.
1926.1001(f)(2)(iii)
The load magnitude for purposes of compliance with paragraph (e)(2) of this section is equal to the vehicle weight. The test of load magnitude shall only be made after the requirements of paragraph (f)(2)(i) of this section are met.
1926.1001(f)(2)(iv)
Material used in the ROPS must have the capability of performing at zero degrees Fahrenheit, or exhibit Charpy V notch impact strength of 8 foot-pounds at minus 20 deg. Fahrenheit.

This is a standard Charpy specimen as described in American Society of Testing and Materials A 370, Methods and Definitions for Mechanical Testing of Steel Products (available at each Regional Office of the Occupational Safety and Health Administration). The purpose of this requirement is to reduce the tendency of brittle fracture associated with dynamic loading, low temperature operation, and stress raisers which cannot be entirely avoided on welded structures.
1926.1001(f)(2)(ii)
The applied load must attain at least a value which is determined by multiplying the vehicle weight by the corresponding factor shown in Figure W-10 for rubber-tired self-propelled scrapers; in Figure W-11 for rubber-tired front-end loaders and rubber-tired dozers; in Figure W-12 for crawler tractors and crawler-type loaders; and in Figure W-13 for motor graders.

FIGURE W-10 - Minimum horizontal load factor for self-propelled scrapers.


FIGURE W-11 - Minimum horizontal load for rubber-tired loaders and dozers.


FIGURE W-12 - Minimum horizontal load factor for crawler tractors
and crawler-type loaders.                


FIGURE W-13 - Minimum horizontal load factor for motor graders.

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