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Ullage

About: Ullage is a research topic. Over the lifetime, 501 publications have been published within this topic receiving 4704 citations. The topic is also known as: headspace.


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Patent
04 Feb 1970
TL;DR: In this paper, an apparatus for determining the quantity of liquid in a closed reservoir containing a liquid and an ullage gas was proposed, where an enclosed gas filled cavity communicates with the reservoir through a common elastomeric diaphragm surface.
Abstract: An apparatus for determining the quantity of liquid in a closed reservoir containing a liquid and an ullage gas. An enclosed gas filled cavity communicates with the reservoir through a common elastomeric diaphragm surface. Infrasonic pressure signals directed into the cavity from a variable frequency driving means cause the ullage gas and the diaphragm to resonate at a frequency proportional to the volume of ullage gas in the reservoir. The ullage volume and therefore the remaining liquid volume is proportional to the ullage gas pressure and the resonant frequency.

33 citations

Patent
19 Feb 1968
TL;DR: In this article, a fuel recovery apparatus including a service station storage tank and a fuel transfer line for connection with a truck tank is provided for receiving vapor expelled from a storage tank during filling thereof and the condensed fuel is returned to the storage tank in liquid form.
Abstract: A fuel recovery apparatus including a service station storage tank and a fuel transfer line for connection with a truck tank Condenser means is provided for receiving vapor expelled from the storage tank during filling thereof and the condensed fuel is returned to the storage tank in liquid form A vapor return conduit may be provided for cycling the expelled vapor back to the ullage in the truck tank during emptying thereof

32 citations

Patent
18 Sep 1996
TL;DR: In this paper, an apparatus for reducing the pressure in a fuel tank ullage includes a conduit adapted to be connected to the fuel tank Ullage and equipped with a controllable valve.
Abstract: An apparatus for reducing the pressure in a fuel tank ullage includes a conduit adapted to be connected to the fuel tank ullage and equipped with a controllable valve. A pressure sensor is adapted for mounting to detect the pressure in the fuel tank ullage, and a catalyst module has an inlet connected to the conduit, a catalyst in the module, an outlet separated from the inlet by the catalyst, a heater disposed to heat the catalyst, and a temperature sensor to detect the temperature of the catalyst. A controller is adapted to receive inputs from the pressure sensor and the temperature detector and output control signals to the heater to heat the catalyst when the pressure sensor indicates the pressure in the ullage exceeds a threshold and to open the controllable valve after the temperature sensor indicates the catalyst has reached a temperature at which it catalyzes volatile hydrocarbons to permit movement of vapor and air from the ullage to the catalyst for oxidation of the vapor and discharge of the oxidation products and air to the atmosphere, thereby reducing the pressure in the ullage.

31 citations

Journal ArticleDOI
TL;DR: In this paper, the authors presented a numerical model of a system-level test bed (MHTB) using the Generalized Fluid System Simulation Program (GFSSP), which is used to model the self-pressurization and ullage pressure control by the Thermodynamic Vent System (TVS).

31 citations

01 Jun 1994
TL;DR: In this paper, extensive slosh testing with liquid and slush hydrogen was conducted in a 62 cubic foot spherical tank to characterize the thermodynamic response of the system under normal gravity conditions.
Abstract: Extensive slosh testing with liquid and slush hydrogen was conducted in a 62 cubic foot spherical tank to characterize the thermodynamic response of the system under normal gravity conditions. Slosh frequency and amplitude, pressurant type, ramp pressure, and ullage volume were parametrically varied to assess the effect of each of these parameters on the tank pressure and fluid/wall temperatures. A total of 91 liquid hydrogen and 62 slush hydrogen slosh tests were completed. Both closed tank tests and expulsions during sloshing were performed. This report presents and discusses highlights of the liquid hydrogen closed tank results in detail and introduces some general trends for the slush hydrogen tests. Summary comparisons between liquid and slush hydrogen slosh results are also presented.

30 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202112
202018
201916
201810
201713
201613