CA2269423A1 - Gasoline vapour recovery method and apparatus - Google Patents
Gasoline vapour recovery method and apparatus Download PDFInfo
- Publication number
- CA2269423A1 CA2269423A1 CA 2269423 CA2269423A CA2269423A1 CA 2269423 A1 CA2269423 A1 CA 2269423A1 CA 2269423 CA2269423 CA 2269423 CA 2269423 A CA2269423 A CA 2269423A CA 2269423 A1 CA2269423 A1 CA 2269423A1
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- CA
- Canada
- Prior art keywords
- gasoline
- chamber
- valve means
- pressure
- atmosphere
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/04—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring fuels, lubricants or mixed fuels and lubricants
- B67D7/0476—Vapour recovery systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/30—Recovery of escaped vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
- B65D90/34—Venting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
- B67D7/32—Arrangements of safety or warning devices; Means for preventing unauthorised delivery of liquid
- B67D7/3227—Arrangements of safety or warning devices; Means for preventing unauthorised delivery of liquid relating to venting of a container during loading or unloading
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
- F16K17/19—Equalising valves predominantly for tanks
- F16K17/196—Equalising valves predominantly for tanks spring-loaded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
- B67D7/32—Arrangements of safety or warning devices; Means for preventing unauthorised delivery of liquid
- B67D7/3281—Details
- B67D2007/329—Function indicator devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
Abstract
This invention relates to an improved gasoline vapour recovery method and apparatus used in association with underground or inground gasoline storage tanks normally vented to atmosphere. The operation of filling the underground tank creates pressure creating gasoline vapours which either directly exhaust to atmosphere or are collected by means of a recovery system in the gasoline delivery truck. According to this invention an apparatus is provided for installation on the venting system comprising a chamber having a first valve means adapted to close in response to a first pre-determined pressure in the chamber. This closure enhances and improves the gasoline vapour recovery operation. A second valve means is provided adapted to open in response to a second and higher pre-determined pressure in the chamber in order to exhaust the pressure creating gasoline vapours to atmosphere through a whistle alarm as required.
Description
GASOLINE VAPOUR RECOVERY
METHOD AND APPARATUS
BACKGROUND OF THE INVENTION
s This invention relates to an improved gasoline vapour recovery method and apparatus used in association with underground or inground gasoline storage tanks normally vented to atmosphere.
Underground tanks typically used for gasoline storage are vented to atmosphere to ensure that no positive or negative pressure is created in the underground tank and associated pumping equipment. The venting system typically consists of a pipe connected to the underground tank at one end which extends upwardly above ground to a ~s suitable and safe position thus permitting the underground tank to breathe directly to atmosphere.
Simply, air enters the underground tank in response to a negative pressure inside the underground tank occasioned, for example, by the act of pumping gasoline out ao of the underground tank into a motor vehicle. Conversely, a positive pressure creating mixture of air and gasoline vapour (air/gasoline mixture) exhausts directly to atmosphere through the venting system. One reason for pressure being created within the underground tank is temperature Zs changes and fluctuations.
The occasions and circumstances when a gas/air mixture will exhaust to atmosphere through the venting system, is not considered a problem from the point of view of pollution, since most of the gas/air mixture consists of air 3o which is present in the system and overlays the gasoline in the underground tank. Problems do arise, however, when a significant volume of gasoline vapour is created during the filling operation of the underground tank with product from a gasoline delivery truck.
3s This filling operation creates an increased volume of gasoline vapours which would normally escape or vent to atmosphere in the absence of any method or device to recapture the venting gases. The recapture of gasoline vapour is, of course, desirable, since gasoline vapours 4o condense back to gasoline, which is a valuable commodity.
As well, recapture of the gasoline vapour prevents pollution of the atmosphere.
The existing method of recapturing venting gasoline vapours requires the delivery truck operator to connect a gas 4s vapour recovery hose between the venting system and the gasoline delivery truck tank at a point below the above ground end of the vent pipe. Accordingly, the movement of gasoline from the gasoline truck to the underground tank creates a vacuum inside the gasoline truck tank which, in so turn, acts on the venting gasoline vapours drawing them back into the gasoline truck.
The problem with the existing method is that it is inefficient. Notwithstanding the proper connection of the recovery hose, most of the gasoline vapours nonetheless ss exhaust to atmosphere due to the paramouncy of the venting system over the recovery system. Quite simply, the recovery system is crude and consists of connecting a 3 inch hose between the venting system and the gasoline truck tank. Since gasoline is delivered by means of a 4 inch 6o hose, the system is unbalanced and facilitates the escape of gasoline vapour through the venting system. Another reason for inefficiency is that the upwardly moving gasoline vapours in the venting system do not sufficiently sense, or react to, the vacuum in the gasoline truck tank and simply 6s continue their upward movement venting to atmosphere.
Another problem is that for whatever reasons, some delivery truck operators neglect or forget to connect the vapour recovery hose with the result that the gasoline vapours escape silently and directly into the atmosphere with obvious disadvantage.
METHOD AND APPARATUS
BACKGROUND OF THE INVENTION
s This invention relates to an improved gasoline vapour recovery method and apparatus used in association with underground or inground gasoline storage tanks normally vented to atmosphere.
Underground tanks typically used for gasoline storage are vented to atmosphere to ensure that no positive or negative pressure is created in the underground tank and associated pumping equipment. The venting system typically consists of a pipe connected to the underground tank at one end which extends upwardly above ground to a ~s suitable and safe position thus permitting the underground tank to breathe directly to atmosphere.
Simply, air enters the underground tank in response to a negative pressure inside the underground tank occasioned, for example, by the act of pumping gasoline out ao of the underground tank into a motor vehicle. Conversely, a positive pressure creating mixture of air and gasoline vapour (air/gasoline mixture) exhausts directly to atmosphere through the venting system. One reason for pressure being created within the underground tank is temperature Zs changes and fluctuations.
The occasions and circumstances when a gas/air mixture will exhaust to atmosphere through the venting system, is not considered a problem from the point of view of pollution, since most of the gas/air mixture consists of air 3o which is present in the system and overlays the gasoline in the underground tank. Problems do arise, however, when a significant volume of gasoline vapour is created during the filling operation of the underground tank with product from a gasoline delivery truck.
3s This filling operation creates an increased volume of gasoline vapours which would normally escape or vent to atmosphere in the absence of any method or device to recapture the venting gases. The recapture of gasoline vapour is, of course, desirable, since gasoline vapours 4o condense back to gasoline, which is a valuable commodity.
As well, recapture of the gasoline vapour prevents pollution of the atmosphere.
The existing method of recapturing venting gasoline vapours requires the delivery truck operator to connect a gas 4s vapour recovery hose between the venting system and the gasoline delivery truck tank at a point below the above ground end of the vent pipe. Accordingly, the movement of gasoline from the gasoline truck to the underground tank creates a vacuum inside the gasoline truck tank which, in so turn, acts on the venting gasoline vapours drawing them back into the gasoline truck.
The problem with the existing method is that it is inefficient. Notwithstanding the proper connection of the recovery hose, most of the gasoline vapours nonetheless ss exhaust to atmosphere due to the paramouncy of the venting system over the recovery system. Quite simply, the recovery system is crude and consists of connecting a 3 inch hose between the venting system and the gasoline truck tank. Since gasoline is delivered by means of a 4 inch 6o hose, the system is unbalanced and facilitates the escape of gasoline vapour through the venting system. Another reason for inefficiency is that the upwardly moving gasoline vapours in the venting system do not sufficiently sense, or react to, the vacuum in the gasoline truck tank and simply 6s continue their upward movement venting to atmosphere.
Another problem is that for whatever reasons, some delivery truck operators neglect or forget to connect the vapour recovery hose with the result that the gasoline vapours escape silently and directly into the atmosphere with obvious disadvantage.
A need exists for improving the gasoline vapour recovery system to ensure that most of the gasoline vapours are recovered. As well, an automatic signaling means of ensuring diligence on the part of the truck operator to ~s properly connect the gas vapour recovery hose is desirable.
SUMMARY OF THE INVENTION
It is an object of this invention to improve the gasoline so vapour recovery system by adapting existing vapour recovery systems and installations with an apparatus which will assist in directing a larger proportion of venting gasoline vapours back to the gasoline truck and thus improve the recovery of the gasoline vapours. .
8s It is another object of this invention to provide an apparatus which automatically signals the gasoline operator to remind the operator in the event that he has not connected the gas recovery system during the delivery of gasoline.
9o According to one aspect of the invention there is provided a gasoline vapour recovery apparatus comprising a chamber, first valve means adapted to close in response to a first pre-determined pressure within the chamber, and a second valve means adapted to open in response to a 9s second and higher pre-determined pressure in the chamber.
According to another aspect of the invention there is provided a gasoline vapour recovery apparatus comprising a chamber, first valve means adapted to close in response to a first pre-determined pressure within the chamber, a second valve means adapted to open in response to a second higher pre-determined pressure in the chamber, and alarm means operable in response to the opening of said second valve means.
According to yet another aspect of the invention there los is provided a method of recovering gasoline vapours from an underground tank by means of a recovery hose connected between a vent pipe and a gasoline truck, by means of increasing pressure on the atmosphere side of the vent pipe connection to the recovery hose.
ns BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings which form part of the specification and are to be read in conjunction therewith and in which like reference numerals are used to indicate like parts in the various views.
Figure 1 is a schematic showing the gasoline vapour recovery circuit.
Figure 2 is a cross-sectional view of the gasoline 12s vapour recovery apparatus.
PREFERRED EMBODIMENT
Turning now to the drawings in greater detail, and initially to Figure 1, the underground gasoline tank (1) is vented at all times to atmosphere (2) by means of a vent pipe or stack (3). In other words, any positive gasoline 13s vapour pressure created inside the underground gasoline tank is released through the vent pipe by exhausting the pressure creating gasoline vapour/air mixture to atmosphere.
Any negative pressure inside the underground gasoline tank is equalized and corrected by an intake of fresh air through 14o the vent pipe. This arrangement represents the normal state of affairs. The arrangement changes when gasoline is being delivered to the underground tank and the operator hooks up the gasoline vapour recovery hose in order to recapture the gasoline vapours.
~4s According to the existing method of recapturing gasoline vapour during product delivery, there is provided surface access (4) to the vent pipe to which the delivery truck operator connects one end of a gasoline vapour recovery hose (4A). The other end is connected to the ~so gasoline truck tank (5) at location (6). The connections at locations (4) and (6) at either end are conventional.
Thus, during the filling operation of the underground gasoline tank by means of a typical surface connection (7), increased gasoline vapours and corresponding pressure is lss created in the underground gasoline tank which conveys the gasoline vapours upwardly through the vent pipe. Because the filling operation also creates a vacuum (7A) in the delivery truck tank, this vacuum acts on some of the upwardly moving gasoline vapour and draws some of it back into the gasoline truck tank by means of the vapour recovery hose connected at location (4A). Thereafter, the gasoline vapours are collected and stored inside the gasoline truck tank.
The gasoline vapour recovery apparatus is shown in ~6s cross-section in Figure 2. An inlet pipe (8) leading directly to a central chamber (9) is connected to the top of the vent pipe (3) by means of a suitable connection. First valve means (10) is provided within the body of the apparatus in the nature of a check valve. During normal operations, the loo check valve permits the underground tank to breathe as described above. In the event of closure of the first valve means due to an increase of pressure inside the central chamber, a second valve means is provided in the nature of a pressure relief valve to permit the pressure creating ~~s gasoline vapour/air mixture to exhaust to atmosphere by means also of passing through the whistle assembly (11 ).
In use, the gasoline vapour recovery apparatus is mounted on top of the vent pipe (2) leading directly to the underground tank. The rain cap normally present on top of ~so the vent pipe (not shown) is removed from the vent pipe and re-installed on top of the whistle assembly (11 ) to prevent the entry of rainwater into the underground tank.
The first valve means consists of a check valve mounted in hanging relationship to orifice (12). The design ass and location of the check valve is such that it offers no restriction to the intake of air from atmosphere into the central chamber for passage to the underground tank. Its design, however, provides for the closure of the orifice (12) when the pressure in the central chamber rises above atmosphere by reason of the exhausting gas/air mixture.
With the gasoline vapour recovery system connected and delivery of fuel commenced, the increased volume of the exhausting gasoline air mixture will create pressure in the central chamber and close the check valve. Because the ~9s pressure required to close the check valve is less than the pressure required to open the second valve means, the central chamber is sealed. The second valve means remain closed. This effect and action effectively closes and shuts down the venting system with the result that a working Zoo pressure will build inside the central chamber. The working pressure will act downwardly in the vent pipe to force and direct the venting gasoline vapour/air mixture through the recovery hose and into the truck tank. In this way the apparatus improves the efficiency of the gas vapour Zos recovery.
Referring to the second valve means, the pressure relief valve is set to open at an operating pressure of about 1 PSI gauge in the central chamber. This setting is considered sufficient to permit the improved gasoline vapour recovery Z~o method to take place for normal operations. It should be noted that the second valve means will always open if the pressure inside the central chamber exceeds 1 PSI gauge which feature satisfies any safety concerns and requirement to have the underground tank vented at all times.
Zls In the event, however, that the gasoline truck operator neglects or forgets to connect the gasoline vapour recovery system as described, the pressure within the central chamber will quickly exceed 1 PSI gauge, which will open the pressure relief valve permitting the gasoline vapour/air aao mixture to vent to atmosphere via the whistle conduit (11 ).
The action of the escaping gasoline vapour/air mixture will sound a whistle causing an audible alarm and signal to the truck driver reminding him that he has failed to hook up the gasoline vapour recovery system. As well, given that the a2s precise volume of gasoline vapour/air escaping through the vapour relief valve can vary, the whistle is mounted in a floating and seated relationship with reference to orifice (12) such that air in excess of what is required for sounding of the whistle will pass around the base of the whistle to 23o atmosphere.
From the foregoing, it will be seen that this invention is one well adapted to attain all the ends and objects hereinabove set forth together with other advantages which a3s are obvious and which are inherent to the structure.
It will be understood that certain features and sub-combinations are of utility and may be employed without reference to other features and subcombinations. This is a4o contemplated by and is within the scope of the claims.
Since many possible embodiments may be made of the invention without departing from the scope thereof, it is to be understood that all matter herein set forth or shown in 24s the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.
SUMMARY OF THE INVENTION
It is an object of this invention to improve the gasoline so vapour recovery system by adapting existing vapour recovery systems and installations with an apparatus which will assist in directing a larger proportion of venting gasoline vapours back to the gasoline truck and thus improve the recovery of the gasoline vapours. .
8s It is another object of this invention to provide an apparatus which automatically signals the gasoline operator to remind the operator in the event that he has not connected the gas recovery system during the delivery of gasoline.
9o According to one aspect of the invention there is provided a gasoline vapour recovery apparatus comprising a chamber, first valve means adapted to close in response to a first pre-determined pressure within the chamber, and a second valve means adapted to open in response to a 9s second and higher pre-determined pressure in the chamber.
According to another aspect of the invention there is provided a gasoline vapour recovery apparatus comprising a chamber, first valve means adapted to close in response to a first pre-determined pressure within the chamber, a second valve means adapted to open in response to a second higher pre-determined pressure in the chamber, and alarm means operable in response to the opening of said second valve means.
According to yet another aspect of the invention there los is provided a method of recovering gasoline vapours from an underground tank by means of a recovery hose connected between a vent pipe and a gasoline truck, by means of increasing pressure on the atmosphere side of the vent pipe connection to the recovery hose.
ns BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings which form part of the specification and are to be read in conjunction therewith and in which like reference numerals are used to indicate like parts in the various views.
Figure 1 is a schematic showing the gasoline vapour recovery circuit.
Figure 2 is a cross-sectional view of the gasoline 12s vapour recovery apparatus.
PREFERRED EMBODIMENT
Turning now to the drawings in greater detail, and initially to Figure 1, the underground gasoline tank (1) is vented at all times to atmosphere (2) by means of a vent pipe or stack (3). In other words, any positive gasoline 13s vapour pressure created inside the underground gasoline tank is released through the vent pipe by exhausting the pressure creating gasoline vapour/air mixture to atmosphere.
Any negative pressure inside the underground gasoline tank is equalized and corrected by an intake of fresh air through 14o the vent pipe. This arrangement represents the normal state of affairs. The arrangement changes when gasoline is being delivered to the underground tank and the operator hooks up the gasoline vapour recovery hose in order to recapture the gasoline vapours.
~4s According to the existing method of recapturing gasoline vapour during product delivery, there is provided surface access (4) to the vent pipe to which the delivery truck operator connects one end of a gasoline vapour recovery hose (4A). The other end is connected to the ~so gasoline truck tank (5) at location (6). The connections at locations (4) and (6) at either end are conventional.
Thus, during the filling operation of the underground gasoline tank by means of a typical surface connection (7), increased gasoline vapours and corresponding pressure is lss created in the underground gasoline tank which conveys the gasoline vapours upwardly through the vent pipe. Because the filling operation also creates a vacuum (7A) in the delivery truck tank, this vacuum acts on some of the upwardly moving gasoline vapour and draws some of it back into the gasoline truck tank by means of the vapour recovery hose connected at location (4A). Thereafter, the gasoline vapours are collected and stored inside the gasoline truck tank.
The gasoline vapour recovery apparatus is shown in ~6s cross-section in Figure 2. An inlet pipe (8) leading directly to a central chamber (9) is connected to the top of the vent pipe (3) by means of a suitable connection. First valve means (10) is provided within the body of the apparatus in the nature of a check valve. During normal operations, the loo check valve permits the underground tank to breathe as described above. In the event of closure of the first valve means due to an increase of pressure inside the central chamber, a second valve means is provided in the nature of a pressure relief valve to permit the pressure creating ~~s gasoline vapour/air mixture to exhaust to atmosphere by means also of passing through the whistle assembly (11 ).
In use, the gasoline vapour recovery apparatus is mounted on top of the vent pipe (2) leading directly to the underground tank. The rain cap normally present on top of ~so the vent pipe (not shown) is removed from the vent pipe and re-installed on top of the whistle assembly (11 ) to prevent the entry of rainwater into the underground tank.
The first valve means consists of a check valve mounted in hanging relationship to orifice (12). The design ass and location of the check valve is such that it offers no restriction to the intake of air from atmosphere into the central chamber for passage to the underground tank. Its design, however, provides for the closure of the orifice (12) when the pressure in the central chamber rises above atmosphere by reason of the exhausting gas/air mixture.
With the gasoline vapour recovery system connected and delivery of fuel commenced, the increased volume of the exhausting gasoline air mixture will create pressure in the central chamber and close the check valve. Because the ~9s pressure required to close the check valve is less than the pressure required to open the second valve means, the central chamber is sealed. The second valve means remain closed. This effect and action effectively closes and shuts down the venting system with the result that a working Zoo pressure will build inside the central chamber. The working pressure will act downwardly in the vent pipe to force and direct the venting gasoline vapour/air mixture through the recovery hose and into the truck tank. In this way the apparatus improves the efficiency of the gas vapour Zos recovery.
Referring to the second valve means, the pressure relief valve is set to open at an operating pressure of about 1 PSI gauge in the central chamber. This setting is considered sufficient to permit the improved gasoline vapour recovery Z~o method to take place for normal operations. It should be noted that the second valve means will always open if the pressure inside the central chamber exceeds 1 PSI gauge which feature satisfies any safety concerns and requirement to have the underground tank vented at all times.
Zls In the event, however, that the gasoline truck operator neglects or forgets to connect the gasoline vapour recovery system as described, the pressure within the central chamber will quickly exceed 1 PSI gauge, which will open the pressure relief valve permitting the gasoline vapour/air aao mixture to vent to atmosphere via the whistle conduit (11 ).
The action of the escaping gasoline vapour/air mixture will sound a whistle causing an audible alarm and signal to the truck driver reminding him that he has failed to hook up the gasoline vapour recovery system. As well, given that the a2s precise volume of gasoline vapour/air escaping through the vapour relief valve can vary, the whistle is mounted in a floating and seated relationship with reference to orifice (12) such that air in excess of what is required for sounding of the whistle will pass around the base of the whistle to 23o atmosphere.
From the foregoing, it will be seen that this invention is one well adapted to attain all the ends and objects hereinabove set forth together with other advantages which a3s are obvious and which are inherent to the structure.
It will be understood that certain features and sub-combinations are of utility and may be employed without reference to other features and subcombinations. This is a4o contemplated by and is within the scope of the claims.
Since many possible embodiments may be made of the invention without departing from the scope thereof, it is to be understood that all matter herein set forth or shown in 24s the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.
Claims (10)
1 Having thus described the invention, what is claimed is:
1. Gasoline vapour recovery apparatus comprising a chamber; first valve means adapted to close in response to a first pre-determined pressure within the chamber; and a second valve means adapted to open in response to a second and higher pre-determined pressure in the chamber.
1. Gasoline vapour recovery apparatus comprising a chamber; first valve means adapted to close in response to a first pre-determined pressure within the chamber; and a second valve means adapted to open in response to a second and higher pre-determined pressure in the chamber.
2. Gasoline vapour recovery apparatus comprising a chamber; first valve means adapted to close in response to a first pre-determined pressure within the chamber; a second valve means adapted to open in response to a second higher pre-determined pressure in the chamber;
and alarm means operable in response to the opening of said second valve means.
and alarm means operable in response to the opening of said second valve means.
3. The apparatus claimed in Claims 1 or 2 wherein said first pre-determined pressure is above atmosphere.
4. The apparatus claimed in Claim 3 wherein said second pre-determined pressure does not exceed one pound per square inch gauge.
5. The apparatus claimed in Claim 4 wherein said first valve means consists of a check valve.
6. The apparatus claimed in Claim 5 wherein said second valve means consists of a pressure relief valve.
7. The apparatus claimed in Claim 2 wherein said alarm means is operable by a gasoline/air vapour mixture exhausting through said second valve means.
8. The apparatus claimed in Claim 7 wherein said alarm means consists of a whistle operable by a gasoline/air vapour mixture.
9. In a method of recovering gasoline vapours from an underground tank by means of a recovery hose connected between a vent pipe and a gasoline truck, the step of increasing pressure on the atmosphere side of the vent pipe connection to the recovery hose.
10. A method of recovering gasoline vapours consisting of using the gasoline vapour recovery apparatus of Claim 1.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2269423 CA2269423A1 (en) | 1999-04-15 | 1999-04-15 | Gasoline vapour recovery method and apparatus |
| AU38007/00A AU3800700A (en) | 1999-04-15 | 2000-04-14 | Gasoline vapour recovery method and apparatus |
| PCT/CA2000/000410 WO2000063108A1 (en) | 1999-04-15 | 2000-04-14 | Gasoline vapour recovery method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2269423 CA2269423A1 (en) | 1999-04-15 | 1999-04-15 | Gasoline vapour recovery method and apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2269423A1 true CA2269423A1 (en) | 2000-10-15 |
Family
ID=4163473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2269423 Abandoned CA2269423A1 (en) | 1999-04-15 | 1999-04-15 | Gasoline vapour recovery method and apparatus |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU3800700A (en) |
| CA (1) | CA2269423A1 (en) |
| WO (1) | WO2000063108A1 (en) |
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| US12043361B1 (en) | 2023-02-18 | 2024-07-23 | Marathon Petroleum Company Lp | Exhaust handling systems for marine vessels and related methods |
| US12006014B1 (en) | 2023-02-18 | 2024-06-11 | Marathon Petroleum Company Lp | Exhaust vent hoods for marine vessels and related methods |
| US12087002B1 (en) | 2023-09-18 | 2024-09-10 | Marathon Petroleum Company Lp | Systems and methods to determine depth of soil coverage along a right-of-way |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2028754A (en) * | 1934-10-18 | 1936-01-28 | John D Crecca | Breather valve |
| US3807433A (en) * | 1972-08-09 | 1974-04-30 | Sun Oil Co | Service station vapor collection system |
| AU511957B3 (en) * | 1979-06-26 | 1980-09-11 | J R Kuykendall | Tank vent pipe and valves |
| GB2138540B (en) * | 1983-01-07 | 1985-12-18 | Lander Alarms | Security device for a liquid-containing tank |
| GB9523215D0 (en) * | 1995-11-13 | 1996-01-17 | Petro Man Ltd | Filling of tanks with volatile liquids |
-
1999
- 1999-04-15 CA CA 2269423 patent/CA2269423A1/en not_active Abandoned
-
2000
- 2000-04-14 AU AU38007/00A patent/AU3800700A/en not_active Abandoned
- 2000-04-14 WO PCT/CA2000/000410 patent/WO2000063108A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| AU3800700A (en) | 2000-11-02 |
| WO2000063108A1 (en) | 2000-10-26 |
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| Date | Code | Title | Description |
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| FZDE | Dead |