US3895885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emptying system for fluid tanks
Assignee: Jonkopings Mekaniska Werkstads AB
•
Filing: 1973-01-03
•
Granted: 1975-07-22
•
Expires: 1993-01-03
Abstract
Abstract A system for emptying a cargo oil tank or the like comprising a centrifugal pump and a separator tank, which is provided for separation of gas and is interconnected in the suction pipe of the pump. Gas in the separator tank is mixed in the form of smell bubbles into the oil on the suction side of the pump and is evacuated distributed in the oil together therewith by the centrifugal pump.
Inventors
- 👤 Lars-Olof Liberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:03
CPC Classifications
B; B63; B63B; B63B27/00; B63B27/24; F; F04; F04D; F04D31/00; F04D9/00; F04D9/001
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
228 words
Method of emptying a container for liquid, such as a cargo oil tank, by means of a centrifugal pump having a pressure pipe, a pump impeller, and an inlet which is connected by a suction pipe to said container through a separator tank provided for separation of gas combined with the liquid as they are drawn from said container into the separator tank, comprising the steps of: drawing said liquid through said suction pipe into said separator tank by means of a partial vacuum created in said separator tank above the surface level of said liquid, allowing said gas to separate from said liquid so as to permit said gas to temporarily accumulate above said liquid in said separator tank, removing said gas from above said liquid in said separator tank and injecting said gas into a mixing device separated from and not forming a part of and disposed below the normal operating surface of said liquid in said separator tank, removing a portion of said liquid from said pressure pipe, injecting said portion of said liquid into said mixing device, mixing said gas with said liquid in said mixing device, so as to form small bubbles in said liquid, injecting the mixture of gas and liquid into said centrifugal pump, and evacuating said gas bubbles distributed in said liquid together therewith by means of said centrifugal pump.
Claim 2
Dependent Claim
228 words
Method of emptying a container for liquid, such as a cargo oil tank, by means of a centrifugal pump having a pressure pipe, a pump impeller, and an inlet which is connected by a suction pipe to said container through a separator tank provided for separation of gas combined with the liquid as they are drawn from said container into the separator tank, comprising the steps of: drawing said liquid through said suction pipe into said separator tank by means of a partial vacuum created in said separator tank above the surface level of said liquid, allowing said gas to separate from said liquid so as to permit said gas to temporarily accumulate above said liquid in said separator tank, removing said gas from above said liquid in said separator tank and injecting said gas into a mixing device separated from and not forming a part of and disposed below the normal operating surface of said liquid in said separator tank, removing a portion of said liquid from said pressure pipe, injecting said portion of said liquid into said mixing device, mixing said gas with said liquid in said mixing device, so as to form small bubbles in said liquid, injecting the mixture of gas and liquid into said centrifugal pump, and evacuating said gas bubbles distributed in said liquid together therewith by means of said centrifugal pump.
Claim 3
Dependent Claim
43 words
Method according to claim 1, comprising the steps of recirculating liquid from the pressure pipe of the pump to said separator tank, finely diffusing said gas in said recirculated liquid, and evacuating a mixture of diffused gas and liquid by said centrifugal pump.
Claim 4
Dependent Claim
22 words
Method according to claim 2, in which said recirculated liquid is mixed with the gas immediately before the inlet of the pump.
Claim 5
Dependent Claim
30 words
Method according to claim 1, in which said quantity of liquid which is recirculated to the pump is regulated in direct dependence upon the liquid level in the separator tank.
Claim 6
Dependent Claim
39 words
Method according to claim 1, in which the gas-liquid mixture is supplied to the pump in such a proportion that the flow of liquid through the pump is adjusted with respect to the liquid level in the separator tank.
Claim 7
Dependent Claim
32 words
Method according to claim 1, in which the proportions of gas/liquid in the gas-liquid mixture supplied to the pump are adjusted in direct dependence upon the liquid level in the separator tank.
Claim 8
Dependent Claim
38 words
Method according to claim 1, in which at least part of said mixture of recirculated liquid and gas is introduced into the pump directed directly towards the pump wheel inlet to break down possible accumulations of gas therein.
Claim 9
Dependent Claim
39 words
Method according to claim 1, in which at least part of said mixture of recirculated liquid and gas is introduced into the pump inlet in such a way that a suitable pre-rotation of said mixture is brought about therein.
Claim 10
Dependent Claim
34 words
Method according to claim 2, in which said recirculated liquid is taken from a point in the pressure pipe of the pump, where the liquid has been caused to separate from the gas. caused
Claim 11
Dependent Claim
199 words
Apparatus for emptying a container for liquid, such as a cargo oil tank, comprising a liquid container, a centrifugal pump which has an inlet, a pump impeller and a pressure pipe, for emptying said container, a suction pipe connecting said container to said pump, a separator tank which is interconnected in said suction pipe between said container and said pump for separating gas from the liquid on its way from said container to said pump, means for mixing gas which is present in an upper portion of the separator tank, in a diffused form into recirculated liquid, said means being separate from and not forming a part of said separator and disposed in a bottom portion of said tank below the normal operating surface of said liquid, means for recirculating liquid from the pressure pipe of the pump to said mixing means, pipe means connected to said mixing means and extending into said upper portion of said separator tank wherein said gas is contained for conducting said gas from said separator tank and introducing it into said mixing means, and means attached to said mixing means, for introducing the gasliquid mixture thus created into the inlet of the pump.
Claim 12
Dependent Claim
199 words
Apparatus for emptying a container for liquid, such as a cargo oil tank, comprising a liquid container, a centrifugal pump which has an inlet, a pump impeller and a pressure pipe, for emptying said container, a suction pipe connecting said container to said pump, a separator tank which is interconnected in said suction pipe between said container and said pump for separating gas from the liquid on its way from said container to said pump, means for mixing gas which is present in an upper portion of the separator tank, in a diffused form into recirculated liquid, said means being separate from and not forming a part of said separator and disposed in a bottom portion of said tank below the normal operating surface of said liquid, means for recirculating liquid from the pressure pipe of the pump to said mixing means, pipe means connected to said mixing means and extending into said upper portion of said separator tank wherein said gas is contained for conducting said gas from said separator tank and introducing it into said mixing means, and means attached to said mixing means, for introducing the gasliquid mixture thus created into the inlet of the pump.
Claim 13
Dependent Claim
31 words
Apparatus according to claim 10, in which said means for mixing gas into the recirculated liquid and for introducing the mixture into the inlet of the pump comprises an ejector means.
Claim 14
Dependent Claim
78 words
Apparatus according to claim 10, in which said means for mixing gas into the recirculated liquid comprises a substantially vertical tube which is provided in the separator tank and has a slightly shorter vertical extension than the separator tank, has a plurality of orifices, which are provided in the tube wall above and below each other, respectively, and has its lower end connected through an ejector means to the pressure pipe of the pump by a return duct.
Claim 15
Dependent Claim
59 words
Apparatus according to claim 10, comprising a return duct, a control valve in said return duct, a level gauge associated with said separator tank and said valve and operating in dependence of the level upon the liquid surface in said separator tank for opening said valve in tHe return duct when said liquid surface drops below a predetermined level.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |