High temperature-high pressure gasket assembly
AssigneeThe Dow Chemical Company
InventorGary L. Whitlow
Life of this patent
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Abstract
An economical gasket assembly for use between glass-lined flanges of sections of glass-lined vessels, which flanges are subject to greater seating stress due to higher temperatures or pressures, which gasket assembly will maintain a seal but not break the glass on the flange seating surface due to the use of a plurality of flexible, compressible corrugated metal sheets interleaved between harder than normal layers of gasket filler material.
Claims20
A substantially flat gasket assembly having two seating surfaces, which gasket assembly is situated between vessel flange joints which are lined with a non-metallic lining, which is operated at high temperatures and pressures, and which gasket assembly is comprised of:
- a plurality of corrugated metal reinforcing sheets interleaved between alternating layers of gasket filler material in such a fashion so that the two seating surfaces of the gasket device are layers of the gasket filler material instead of corrugated metal sheets;
- said corrugations of said metal reinforcing sheets being annularly concentric as opposed to being radially concentric;
- said corrugated metal reinforcing sheets having a modulus of elasticity of less than about 33,000,000 pounds per square inch;
- said gasket filler material being non-metallic but sufficiently hard so that each layer of it has a pressure-temperature coefficient which is greater than about 75,000 pounds per square inch gauge degrees Fahrenheit (psig .degree.F.), and a temperature rating greater than about 375.degree. F.;
- and
- said gasket assembly not employing an envelope.
An article of manufacture comprised of a substantially flat gasket assembly fitted between the two opposing seating surfaces of the flanges of a flange joint connecting two portions of a vessel,
- with at least a part of the interior of said vessel and at least the seating surfaces of said flange joint being lined with a brittle, non-machined, non-metallic lining;
- with said gasket assembly being comprised of a plurality of corrugated metal reinforcing sheets interleaved between layers of gasket filler material in such a fashion so that the two seating surfaces of the gasket device are layers of the gasket filler material instead of the corrugated metal sheets;
- the corrugations of said corrugated metal reinforcing sheets being annularly concentric as opposed to being radially concentric;
- said corrugated metal reinforcing sheets having a modulus of elasticity of less than about 33,000,000 pounds per square inch;
- said gasket filler material being non-metallic but sufficiently hard so that each layer of it has a pressure-temperature coefficient which is greater than about 75,000 pounds per square inch gauge degrees Fahrenheit (psig .degree.F), and a temperature rating which is greater than about 375.degree. F.;
- and
- said gasket assembly not employing an envelope.
Dependencies are inferred from the claim text.