S on American Crane & Equipment Corp.

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Crane and Hoist Equipment and Components by Type > Resource Center > Crane Glossary > S


	S
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		SHALL This word indicates that adherence to the particular requirement is necessary in order to conform to the specification.




		SHEAVE A grooved wheel or pulley used with a rope or chain to change direction and point of application of a pulling force.




		SHOULD This word indicates that the requirement is a recommendation, the advisability of which depends on the facts in each situation.




		SHROUD Fabricated metal housing designed to guard moving machinery and prevent incidental contact with personnel.




		SINGLE GIRDER CRANE A crane which runs on a single bridge girder.




		SINGLE-FAILURE PROOF Those features that are included in the crane design such that any credible failure of a single component will not result in the loss of capability to stop and hold the critical load within facility acceptable excursion limits.




		SKELTON CAB Those features that are included in the crane design such that any credible failure of a single component will not result in the loss of capability to stop and hold the critical load within facility acceptable excursion limits.




		SKEWING FORCES Lateral forces on the bridge truck wheels caused by the bridge girders not running perpendicular to the runways. Some normal skewing occurs in all bridges.




		SPAN The horizontal distance center-to-center of runway rails.




		SPENT FUEL As defined by the Nuclear Regulatory Commission: "Nuclear reactor fuel that has been used to the extent that it can no longer effectively sustain a chain reaction."




		SPENT FUEL POOL As defined by the Nuclear Regulatory Commission "An underwater storage and cooling facility for spent (used) fuel elements that have been removed from a reactor."




		SPENT NUCLEAR FUEL As defined by the Nuclear Regulatory Commission: "Fuel that has been removed from a nuclear reactor because it can no longer sustain power production for economic or other reasons. "




		STACKER CRANE An overhead crane having fixed or telescopic vertical mast suspended from its trolley frame. The mast is fitted with a moveable fork assembly capable of raising an lowering.




		STATIC CONTROL A method of switching electrical circuits without the use of contacts.




		STEPLESS CONTROL A type of control system with infinite speed control between minimum speed and full speed.




		STEPPED CONTROL A type of control system with fixed speed points.




		STOP A device to limit travel of a trolley or crane bridge. This device normally is attached to a fixed structure and normally does not have energy absorbing ability.




		STRENGTH, ULTIMATE AVERAGE The average tensile force per unit of cross sectional area required to rupture the material as determined by test.




		SWEEP Maximum lateral deviation from straightness of a structural member, measured at right angles to the Y-Y axis.