Method and apparatus for determining permeability and thickness

Details Method and apparatus for determining permeability and thickness Method and apparatus for determining permeability and thickness

1981-01-19

1983-01-04

Kazenske, Edward R.

Measuring and testing

With fluid pressure

Porosity or permeability

G01N 1508

Patent

active

043667031

ABSTRACT:
A simple, easily operated method and apparatus for determing the thickness and gas permeability of refractory coatings as such coatings are in place on foundry molds and cores. The apparatus is entirely portable, requires no connections to utility supplies such as electricity, air sources and so forth, and is hand-held during operation. The apparatus comprises a hand-held probe having an outlet orifice of known, predetermined size for making contact with the mold and a hand-held measuring unit which includes a cylinder having a gravity-actuated piston, a gas flow rate meter, and a gravity-actuated check valve. The two separate hand-held units are interconnected by flexible conduit. The cylinder and piston combination cause a flow of air at controlled pressure through the mold at the probe contact surface. In operation, the piston is actuated by inverting the hand held measuring unit and then reinverting to its normal position. To estimate refractory coating thickness, known relationships between permeability and thickness are utilized following their establishment by independent methods of measuring coating thickness.

REFERENCES:
patent: 2659433 (1953-11-01), Brown
patent: 3056281 (1962-10-01), Smyth
patent: 3808876 (1974-05-01), Kershaw
patent: 3889521 (1975-06-01), Jakimowicz

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