Section 23.41. Centrifugal extractors or whizzers

(a) Each belt-driven centrifugal extractor or whizzer shall be equipped with a metal cover with an interlocking device which shall prevent both the cover from opening while the basket is connected to power and the power operation of the basket while cover is open. The device may not prevent the movement of the basket by hand to insure an even loading. A hand-operated brake shall be installed on each belt-driven extractor wherever possible.

(b) The rating of the manufacturer shall be stamped in letters not less than 1/4 inch high on the outside of the machine in a place that is easily visible. The maximum permissible speed shall be given in revolutions per minute.

(c) When rated speeds cannot be obtained from the manufacturer, the following speeds shall not be exceeded:

Diameter extractors (in inches)	Revolutions per minute
30	1200
48	750
60	500