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Zwick Energy Research Organization, Inc.

Kenneth L Hoffman

Eugene B Zwick

William D Brigham

Dung D Nguyen

A last event indicator apparatus includes a cylindrical support having a longitudinal axis, an outer surface and a tapered flange structure. The tapered flange structure has a first end having a first diameter and a second end having a second diameter that is greater than the first diameter of the first end. An expandable indicator ring is disposed over the outer surface. The indicator ring is axially displaceable along the longitudinal axis to engage the tapered flange structure and cause expansion of the indicator ring. The expandable indicator ring is rotatable about the longitudinal axis over the outer surface to each of a plurality of selected positions.

Last event indicator

A leak detector including a fill cylinder and a pressure cylinder mounted in spaced relationship on a frame. The fill cylinder includes a movable liquid-tight piston, valved ports on one side of the piston, and a vent port on the opposite side. The pressure cylinder includes a movable pressure piston, a pressure regulator in communication with one side of the piston, and an access port on the opposite side. A connecting rod interconnects the liquid-tight piston and the pressure piston and spans the space between the cylinders. A pointer attached to the connecting rod registers with a calibrated scale on the frame and movement of the pointer toward the fill cylinder indicates a leak in the pressurized liquid piping system being tested.

Apparatus and method of detecting leaks in pressurized piping systems

A burner having a burner body in which combustion air is injected in an air flow pattern which establishes a relatively stagnant air region positioned within the flow of combustion air. A pilot flame injector is positioned to generate a pilot flame extending into the stagnant air region. The pilot flame can, thus, be maintained during the operation of the burner because the stable air conditions within the stagnant air region minimize disruption of the pilot flame by the flow of combustion air. A method for maintaining a uniform pilot flame within a burner operating over a range of combustion air flow rates by introducing combustion air into the burner and providing the combustion air with a flow configuration that establishes a stagnant air zone within the burner that is relatively independent of the flow rate of the combustion air. The pilot flame is then positioned within the stagnant air zone. An injector for feeding finely divided fuel to a burner. The injector includes means to provide an annular passage through which air may flow at high velocity for discharge into a burner. Means are provided to feed fuel into the annular passage such that the fuel may be broken up into minute droplets by the air flow through the passage. Additionally the means to feed fuel are positioned to minimize contact between the fuel and the passage surfaces. Thus, the fuel may be broken up into minute droplets within the air flow stream with the finely divided fuel being discharged into a burner.

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Grand Island, NE, United States of America

Kenneth L Hoffman