US4387669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater
Assignee: MURRELL'S WELDING WORKS Inc P O BOX 1338 LEVELLAND TX 79336-1338 A CORP OF TX
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Filing: 1982-03-29
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Granted: 1983-06-14
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Expires: 2002-03-29
Abstract
Abstract A portable oil field heater heats a liquid water-petroleum mixture by passing it through a single continuous path primary coil, and then a single continuous path secondary coil. The continuous path primary coil extends along the walls of the heater, and the secondary coil is a bundle above an LPG burner. The air for combustion is introduced from the top of the heater through false walls to beneath a false floor beneath the burner. Thus, it is not necessary to have insulation (particularly fire brick) along the sides of the heater; thereby greatly reducing weight and maintenance. The safety of the unit is greatly improved by introducing the combustion air from a height well above the level of the burner.
Inventors
- 👤 Billy G. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:28
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/0027; F24H1/0045; F24H1/06; F24H1/22; F24H1/40; F24H1/406
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
235 words
An oil field heater for heating produced liquid comprising in combination: a. a housing having (i) a closed floor, joined to (ii) four closed side walls, which are joined to (iii) a top with (iv) a short stack thereon, b. tubing forming a single path for liquids within the housing, said path being (i) from an inlet near the juncture of the floor and one of the side walls, into a primary coil which is (ii) helically around the side walls up to the stack, (iii) and from the top of the primary coil into the top of a secondary coil which is a bundle formed of (iv) a series of spaced apart horizontal layers, (v) each layer including a series of spaced apart tubes, and (vi) from the bottom of the secondary coil to an outlet near the junction of the floor and one of the side walls, c. said primary coil spaced from each of the four side walls thus forming four air passageways, one passageway between the primary coil and each of the four walls, and d. a blower at the top of each air passageway to blow combustion air to e. a burner located in f. a fire box above the floor and below the bottom of the secondary coil, g. so that the four side walls are separated from the fire box by the primary coil and the air passageways.
Claim 2
Dependent Claim
235 words
An oil field heater for heating produced liquid comprising in combination: a. a housing having (i) a closed floor, joined to (ii) four closed side walls, which are joined to (iii) a top with (iv) a short stack thereon, b. tubing forming a single path for liquids within the housing, said path being (i) from an inlet near the juncture of the floor and one of the side walls, into a primary coil which is (ii) helically around the side walls up to the stack, (iii) and from the top of the primary coil into the top of a secondary coil which is a bundle formed of (iv) a series of spaced apart horizontal layers, (v) each layer including a series of spaced apart tubes, and (vi) from the bottom of the secondary coil to an outlet near the junction of the floor and one of the side walls, c. said primary coil spaced from each of the four side walls thus forming four air passageways, one passageway between the primary coil and each of the four walls, and d. a blower at the top of each air passageway to blow combustion air to e. a burner located in f. a fire box above the floor and below the bottom of the secondary coil, g. so that the four side walls are separated from the fire box by the primary coil and the air passageways.
Claim 3
Dependent Claim
54 words
An oil field heater fitting the description of claim 1 including all the limitations a. through g. and also comprising: h. a rain cap pivoted to the housing above the stack to prevent rain water from falling into the heater while not in use, and j. a condensate drain pipe extending through the floor.
Claim 4
Dependent Claim
45 words
An oil field heater fitting the description of claim 1 including all the limitations a. through g. and also comprising: h. the blower inlets being at about the same elevation as the top of the primary coil which is about the elevation of the stack.
Claim 5
Dependent Claim
35 words
An oil field heater fitting the description of claim 1 including all the limitations a. through g. and also comprising: h. a sheet metal sleeve snugly around the primary coil to prohibit flame leakage therefrom.
Claim 6
Dependent Claim
51 words
An oil field heater fitting the description of claim 1 including all the limitations a. through g. and also comprising: h. additional space between the upper portion of the primary coil and the housing to provide an induced air passageway between the housing and the primary coil at the stack location.
Claim 7
Dependent Claim
46 words
An oil field heater fitting the description of claim 1 including all the limitations a. through g. and also comprising: h. the floor being insulated, and j. the burners spaced above the floor so there is an air passageway between the burner and the insulated floor.
Claim 8
Dependent Claim
51 words
An oil field heater fitting the description of claim 6 including all the limitations a. through j. and also comprising: k. additional space between the upper portion of the primary coil and the housing to provide an induced air passageway between the housing and the primary coil at the stack location.
Claim 9
Dependent Claim
35 words
An oil field heater fitting the description of claim 7 including all the limitations a. through k. and also comprising: l. a sheet metal sleeve snugly around the primary coil to prohibit flame leakage therefrom.
Claim 10
Dependent Claim
45 words
An oil field heater fitting the description of claim 8 including all the limitations a. through l. and also comprising: m. the blower inlets being at about the same elevation as the top of the primary coil which is about the elevation of the stack.
Claim 11
Dependent Claim
54 words
An oil field heater fitting the description of claim 9 including all the limitations a. through m. and also comprising: n. a rain cap pivoted to the housing above the stack to prevent rain water from falling into the heater while not in use, and o. a condensate drain pipe extending through the floor.
Claim 12
Dependent Claim
45 words
An oil field heater fitting the description of claim 1 including all the limitations a. through g. and also comprising: h. a truck with said heater mounted thereon, j. a liquid tank mounted on the truck, and k. a fuel tank mounted on the truck.
Claim 13
Dependent Claim
45 words
An oil field heater fitting the description of claim 10 including all the limitations a. through o. and also comprising: p. a truck with said heater mounted thereon, q. a liquid tank mounted on the truck, and r. a fuel tank mounted on the truck.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |