US1400441A - Oil-separator trap - Google Patents

Description

E. C. KELLY.

OILSEPARATOR TRAP.

APPLICATION FILED JUNE 11, 1920.

Patented Dec. 13, 1921.

. 4 1 aii I fizpaiifi? Edward 611K955! 71125 am /my? UNITED STATES rareur OFFICE.

EDWARD C. KELLY, OF BOSTON, MASSACHUSETTS.

' oin-snrane'ron TRAP.

Specification of Application filed June 17,-

To all whom it may concern:

Be it known that I, EDWARD C. KELLY, a citizen of the United States of America. and resident of Boston, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Oil-Separator Traps, of which the following is a specification.

This invention relates to oil separator traps of that type commonly employed for separating gasolene, oils and greases from drainage water flowing from garages, machine shops and the like, whereby to prevent the discharge of such inflammable materials into public sewers.

Devices of the above character, in many cases, in order to secure efliciency of operation, have been complex and costly of construction, requiring frequent attention in order to secure the best operative results.

One object of the present inventionis to overcome such objectionable features of prior devices and to provide a trap, of simple form which shall require the minimum amount of attention.

v In the continued .use of traps of the above character, the drainage water deposits considerable quantities of sand or other solid particles in the separatingchaniber and it becomes necessary to remove such deposit fromtime to time. With traps as commonly constructed, it is necessary, in order to reach the depositedsilt,-to remove a cover or manhole, and such removal is rendered dangerous in many cases byreason of the accumulation of inflammable gases in the upper part of the separatingchamher and belowthe cover. Moreover, in many such arrangements, the manholeopens. directly into the oil chamber, and in orderto .removethe silt the dipper or other tool employed must be thrust down through the oil contained therein. Oilis thus removed with the silt and wasted, whileat thesame time its discharge with the silt is objectionable and the task of removing the silt made dirty and disagreeable I V V I .A further object of the present invention is to provide a trap of the type above de scribed in which the oil chamber zma-y remain permanently sealed and whereinpthe silt may be removed readily from the sepa- Letters Patent.

rating chamber without disturbance of the oil or without danger from the escape of inflammable gases.

A preferred arrangement of parts by means of which the above objects may be attained is disclosed in the accompanying drawings, in which Figure 1 is a cross sectional view showin the device in position for use; and b Fig. 2 is a plan view of the same.

Referrmg to the drawings, 1 indicates the ground or floor level, below which the apparatuswill ordinarily be placed, although th1s is not essential. 2 is a substantially cylindrical drum or casing having a closed bottom end Sand a closed upper end 4, and forming a fluid container or receptacle. This drum is preferably formed of sheet metal having the ends suitably secured to the cylindrical portion thereof.

Extending downwardly through the upper end ofthe drum isa substantially cylindrical casing 5 having open ends, the lower end 6 being spaced from the bottom of the drum 2. The casing 5 preferably extends above the upper end 4: of the drum as shown at 7 and opens at the floor level, a cover plate 8 being provided for normally closing'the upperend of the casing 5. This cover ,may be sufficiently heavy to retain its position by its own weight, or may, if desired, be removably secured by screwthreaded engagement with the interior wall of the casingor'by means of bolts. EX-

tending outwardly and laterally from the upper portion of the casing 5 is a vent pipe 9 which passes through the side wall of the drum 2;.and may thence be vertically extended ,asshown at 10 to someelevated p0- sitionto discharge intotheopen air.

As shown herein,the casing 5 issubstantial ly concentric with the cylindrical walls of the drum 2 thus providing an-annular space 11 between the casing and said walls.

@pcning 'directly into this annular space, at the upper portion thereof, as shown at 12,

:is a pipe 13, this pipe leading through the usual interposed trap from some point or pointsv where oil and water collect; The

pipe 13 will as usual be connected at a c0n- \QlllQllt point with a stack orflue, not shown,

leading to a point above the roof of the with a handle 21 for manual manipulation by the operator, and at 22 is indicated a suitable receptacle for fluid discharged by the pump spout.

At some point, as 23, near the bottom 3 of the drum 2, an overflow pipe 2% is connected, said pipe having a branch 25 leading to the sewer or other suitable point of discharge. If desired, this pipe 24 may extend to the floor level and be provided with a clean-out cover 26.

When the device is installed below the floor level, asshown in the drawings, any fluid passing down the pipe 13 will be discharged directly into the annular space 11 between the cylindrical wall of the drum 2 and the casing 5. The annular space-into which the fluid is thus discharged and which extends down to the bottom edge of the casing 6 forms a separating chamber for any fluid flowing thereinto, and as the area of this annular space is large as compared with the cross-sectionalarea of the pipe. 13, the fluid in such space is disturbed to but little extent by the discharge thereinto of fresh fluid from the pipe. As the fluid may thus remain quiet in the annular chamber,

any oil, grease, gasolene or gaswhich may 'be mingled with the fluid as it enters, ispermitted to separate by gravity from the water and to'rise into the upper portion of said annular chamber. As the upper end of this chamber is entirely closed, it is evident that gas rising from the liquid will be retained "therein except such as may escape along the pipe 13 from whence it will be discharged.

' The drainage water entering through the pipe 13 is often heavily charged with sand,

silt'or other solid material, and the latter is permitted to settle out in the relative quiet of the annular chamber 11, falling through the open" end of is'aid'chamber into the'bottom of the receptacle 2, where it accumulates as indicated for example at 27, the oil in the upper portion of said chamber being 1 indicated at 28. As thelevel of the combined contentsof'the receptacle 2 rise'spthe water will gradually rise in the pipe 24 until it is dischar'ed through the pipe 25 into the sewer. ny oil or grease which accumulates in the upper portion of the annular chamber may bereadily removed therefrom by manipulation of the hand anticipatedin the orderly use of the apparatus.

Upon the accumulation of a considerable quantity of silt in the lower portion of the drum 2, it may be removed therefrom by taking off the cover 8 and inserting a suitable spoon, dipper, or other tool, the arrangements of the parts being such as to permit a tool to be moved readily throughout the entire area of the bottom of the drum, thus permitting the accumulation of silt or sand to be thoroughly cleaned out. As will be noted, the removal of the cover 8 and any gas which may have accumulated in the top of the latter above pipe 13 is still confined therein regardless of the removal 'of. the cover. In this manner a frequent cause of disastrous explosions is removed, as carelessness on the partof the operator in removing the cover gives no "opportunity for inflammable gases to be rebe understood that'rec epta'cles of other materials may be readily employed and that the fluid containing chamber may if desired be formed as a cavity in the earth and suitably lined with concrete. It is furthermore to be understoodthat theexaot arrangement of vent pipes and discharge openings is not essential to the carrying out of this inventi0n', but that other arrangements may be substituted in so far as they donot inter- 1n no way affects the annular oil chamber,

'fere withthe intended operation of the de- 'vice as above indicated and .in whichthe space 29 within the casing 5'is'normally sealed from the oil chamber by a fluid seal. Iclaim:' r

1. An oil separator having "in combination,

casing, and means for discharging mingled oil and Water directly into the space between 'a closed fluid container, anopen ended cassaid container and casing, and at a point substantially above the lower end of said casing.

2. A device of the class described comprising a substantially annular separating chamber provided with an inlet opening in the side thereof and adjacent its upper end, an open ended casing extending downwardly in said separating chamber at a point substantially below said inlet opening and substantially concentric with said chamber, and a cover for the upper end of said casing.

3. In a combination in a device of the class described, a receptacle having a closed upper end and provided at its upper portion with an annular oil separating chamber, means whereby mingled water, oil and silt may be discharged directly into said chamber, means for removing oil from said chamber, an overflow discharge for water from said receptacle, and means substantially sealed from entry of oil or gas and constructed and arranged to permit removal of precipitating silt upwardly from said receptacle.

4. In a trap for separating fluids of different specific gravities, a closed cylindrical fluid receptacle having 1ts axis substantially vertical, a cylindrical casing extending downwardly into said receptacle and to a point substantially below the normal fluid level therein, a removable cover plate for the upper end of said casing and means whereby mixed fluids may be discharged directly into the annular space between said container and casing.

5. An oil separator trap having in com bination of a fluid containlng drum having a substantially vertical axis, and closed at its ends, an open ended casing extending into said drum from its upper end and to a point below the normal level for fluid therein, an overflow pipe leading from a point near the bottom of said receptacle, and an inlet pipe arranged to discharge fluid into said drum at a point substantially above the lower end of said casing and between the same and the wall of the drum.

6. A trap comprising a substantially cylindrical drum having closed ends, an open ended casing arranged substantially concentrically of said drum, one end of said casing extending toward the bottom of said drum but spaced therefrom, a removable cover for the opposite end of said casing, a vent pipe leading from the upper part of said casing, an inlet pipe arranged to discharge into the annular space between said drum and casing, means extending through the upper end of said drum into said annular space whereby fluid may be removed therefrom, and an overflow discharge for said drum.

Signed by me at Boston, Massachusetts, this tenth day of June, 1920.

EDWARD C. KELLY.

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