Mining roof support cylinder corrosion protection apparatus and method
AssigneeAvistar, Inc.
InventorsLawrence Randlett, Steven Willard
Life of this patent
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Abstract
A roof support for an underground mine which has a hydraulic cylinder positioned between a roof engaging support and a ground engaging base and has a flexible gas barrier or enclosure surrounding surfaces of said hydraulic cylinder which are subject to corrosion by gases present in the underground mine. Continuous flowing non-corrosive gas such as nitrogen is supplied to a space between the gas barrier and said hydraulic cylinder for preventing corrosion of cylinder surfaces by corrosive gases present in the mine which may include hydrogen sulfide.
Claims21
A method for protection of exposed metal surfaces in a coal mine comprising the steps of:
- placing parts in the coal mine having a corrosive gas;
- and
- creating a non-corrosive environment immediately adjacent to corrosion sensitive parts.
A roof support for an underground mine comprising in combination:
- a roof engaging support;
- a ground engaging base;
- at least one hydraulic cylinder positioned between said roof engaging support and said ground engaging base;
- a flexible gas barrier surrounding surfaces of said hydraulic cylinder which are subject to corrosion by gases present in said underground mine;
- and
- a non-corrosive gas supply for supplying a non-corrosive gas to a space between said gas barrier and said hydraulic cylinder.
Dependencies are inferred from the claim text.