US3225962A

US3225962A - Method of and means for supplying additive to a fluid

Info

Publication number: US3225962A
Application number: US383101A
Authority: US
Inventors: Robert E Leobeck
Original assignee: Phillips Petroleum Co
Current assignee: Phillips Petroleum Co
Priority date: 1964-07-16
Filing date: 1964-07-16
Publication date: 1965-12-28
Anticipated expiration: 1982-12-28

Description

Dec. 28, 1965 R. E. LEOBECK METHOD OF AND MEANS FOR SUPPLYING ADDITIVE TO A FLUID 4 Sheets-Sheet 1 Filed July 16, 1964 INVENTOR. R. E. LOEBECK BY y? ATTORNEYS Dec. 28, 1965 R. E. LEOBECK METHOD OF AND MEANS FOR SUPPLYING ADDITIVE TO A FLUID 4 Sheets-Sheet 2 Filed July 16, 1964 INVENTOR.

R. E. LO E BECK A T TORNEVS FIG. 2

R. E. LEOBECK Dec. 28, 1965 4 Sheets-Sheet 3 Filed July 16, 1964 INVENTOR.

R. E. LOEBECK wmm H5 ,8 EU: a 1 g y La mm mm m9 G V A0 EmkZDOU 02 o m9 AT TORNEVS Dec. 28, 1965 R. E. LEOBECK METHOD OF AND MEANS FOR SUPPLYING ADDITIVE TO A FLUID 4 Sheets-Sheet 4 Filed July 16, 1964 S-ll o I la R'Qo R-l2c 24 VOLTS POWER SU FPLY zovnc) ZOVDC 5 PC-ll II5 VAC ZVDC INVENTOR.

R. E LOEBECK A TTORNEKS FIG. 5

United States Patent F 3,225,962 METHOD OF AND MEANS FOR SUPPLYING ADDITIVE TO A FLUID Robert E. Leobeck, Bartlesville, Okla., assignor to Phillips Petroleum Company, a corporation of Delaware Filed July 16, 1964, Ser. No. 383,101 6 Claims. (Cl. 2221) This invention relates to supplying an additive to a fluid. In one aspect the invention relates to a method for supplying an additive to a fluid being delivered and to stop delivery of said fluid when said additive is not supplied. In one aspect the invention relates to means for dispensing a fluid and supplying an additive thereto and for preventing delivery of the fluid when the additive is not supplied. In another aspect the invention relates to LPG key stop dispensing apparatus including means for supplying an odorant at the time of delivery and for preventing delivery when the odorant is not supplied in normal amount.

The term key stop loading has been applied to loading facilities which allow customers to load their own delivery vehicles without supervision by the operator of the installation. Automated installations are being used in the loading of petroleum products into transport trucks, thus keeping transport equipment in operation 24 hours a day, even where continuous manning of loading racks is uneconomical. It is desirable to utilize such installations in the delivery of LPG. However, due to the type of se to which this product is put, for example, household heating and cooking, often it is necessary to supply an odorant to the LPG at the time of delivery to the transport truck. Where such deliveries are made without attendance of an operator of the loading facilitiy, it is desirable to provide a positive indication that the odorant has been supplied and to prevent delivery of unodorized product.

An object of my invention is to supply an additive to a fluid.

Another object of my invention is to provide a positive indication of the supply of an additive to a fluid and to prevent delivery of the fluid when the additive is not supplied in normal quantity.

Another object of my invention is to provide unattended LPG dispensing.

Another object of my invention is to dispene orodized LPG with a positive indication of the odorant supplied and to prevent delivery when the odorant is not supplied in normal quantity.

Other aspects, objects and the advantages of my invention are apparent in the written description, the drawing and the claims.

According to my invention, an additive is supplied to a fluid by transferring the fluid through a fluid conduit, introducing the additive into the fluid in the conduit, metering the flow of fluid in the conduit and the additive introduced theren, discontinuing the flow of fluid when a predetermined amount has been transferred and discontinuing the flow of additive when a predetermined amount has been injected into the fluid, discontinuation of the flow of fluid also discontinuing the flow of additive regardless of the amount supplied. Further according to my invention, an additive is supplied to a fluid by transferring a stream of the fluid through a fluid conduit, introducing the additive into the fluid conduit, dividing the stream into a major delivery stream and a minor delivery stream, stopping the flow of additive when a predetermined amount has been supplied, stopping flow of fluid in the major delivery stream when a first predetermined amount of fluid has been transferred, and stopping delivery in the minor delivery stream when the desired total amount has been transferred.

3,225,962 Patented Dec. 28, 1965 Further according to my invention, there is supplied means for dispensing a fluid, comprising a transfer conduit, a pump to transfer a stream of the fluid through the fluid conduit, means to introduce the additive into the fluid conduit, means to divide the stream into a major delivery stream and a minor delivery stream, a first control valve in the major delivery stream, a second control valve in the minor delivery stream, means to stop flow of the additive, first set stop counter means having a first switch to actuate the first control valve to closed position at a first predetermined value, a second switch to actuate the second control valve to closed position, stop the pump and actuate the means to stop flow of additive at a second predetermined value, second set stop counter means to actuate the means to stop the flow of additive at a third predetermined value, first and second ticket printing means, a first fluid meter for the stream in the fluid conduit, means actuated by the first fluid meter to produce electrical pulses at a rate proportional to the rate of flow of the stream of the fluid conduit and to transfer the pulses to the first set stop counter means to actuate the first counter means to count the pulses and to the first ticket printing means, a second fluid meter for the means to introduce additive into the fluid conduit and means actuated by the second fluid meter to produce electrical pulses at a rate proportional to the rate of flow of the additive and to transfer the pulses to the second set stop counter means to actuate the second counter means to count the pulses and to the second ticket printing means.

In the drawing, FIGURE 1 is a schematic representation of a delivery, odorizing and control system.

FIGURE 2 is a diagrammatic electrical circuit for the system illustrated in FIGURE 1.

FIGURE 3 is a schematic representation of another system according to my invention for delivery, odorizing and control.

FIGURE 4 is a schematic representation of a portion of another system according to my invention for delivery, odorizing and control.

FIGURE 5 is a detailed control system circuit.

In FIGURE 1, the liquefied petroleum gas from a source such as a storage tank, not shown, flows through pump 11 which delivers the stream of LPG through the fluid transfer conduit 12. A positive displacement meter 13 and a control valve 14 are provided in conduit 12 Conduit 12 is extended beyond valve 14 to a point of delivery of LPG, such as a tank truck.

An odorant, such as ethyl mercaptan, is supplied from an odorant tank 16 through an odorant supply conduit 17 to fluid transfer conduit 12. The odorant is supplied under pressure by an odorant pump 18 and the supply of odorant is metered by means of a positive displacement meter 19. Odorant is supplied from tank 16 to pump 18 by pressure of a gas under pressure, for example, nitrogen, from a source such as nitrogen bottle 21, and the pressure is regulated by pressure regulator 22. Odorant is supplied to tank 16 from a source, not shown, through supply conduit 23.

A mechanical drive 26 from meter 13 provides means whereby meter 13 operates one register of a dual ticket printer 27, to provide means for recording the amount of fluld delivered. An electrical pulsing means 28 also is driven by mechanical drive 26 and supplies pulses to a dual set stop counter or meter 29.

Set stop meter 29 is constructed with an internal ratchet mechanism is such a manner that, when a register is set for the desired amount of delivery of the fluid, the correct amount of odorant also is set on a separate switching register. The ratio of the ratchet mechanism can be adjusted to provide for different ratios of odorant supply with respect to fluid delivery.

Odorant meter 19 is provided with electrical pulsing means which transmit pulses to dual set stop meter 29 to actuate the meter and switching means associated with the desired odorant supply. The same pulses from meter 19 also are supplied to a step motor 31 to drive One register of ticket printer 27 which registers the amount of odorant supplied.

Mercaptan tank 16 has a level switch 36 associated therewith and connected in a circuit to stop delivery of LPG when the level in tank 16 reaches a point at which desired delivery cannot be expected to be maintained. A flow switch 37 is provided in conduit 12 and this switch also will cause shutdown of the delivery operations if the flow of fluid through conduit 12 is below a predetermined value.

A remote start-stop station 38 is provided at the de sired point of loading. A control box 39 is provided at a suitable location.

FIGURE 2 is a simplified electrical circuit diagram for the operation as illustrated in FIGURE 1. The switch 41 is a manual switch located at start-stop station 38. Closing of switch 41 actuates a time delay relay 42 resulting in immediate closing of contacts 43. Contacts 43 open after a predetermined time delay and, in normal operation, the circuit is maintained by contacts 44 which are a part of flow switch 37 and which are closed when a desired rate of flow through conduit 12 is reached.

The electrical pulse generation means associated with meter 19 comprises an incandescent lamp 46, a rotating disc 47, and a photoelectric cell 48. Disc 47 is turned by meter 19 at a speed proportional to the rate of flow of odorant through conduit 17. As it rotates, the cut out portion 49 permits pulses of light to reach cell 48 from lamp 46, thus pulsing relay R The relay R operates

contacts

51 and 52 without delay both on closing and opening. Contacts 51 complete a circuit to relay R which operates normally closed contacts 53 which open and close without delay. Contacts 52 complete a circuit to relay R which operates contacts 54 which closes with a delay which is somewhat longer than the normal spacing between pulses through relay R Relay R similar- 1y actuates normally-closed contacts 56 with a delay which is somewhat longer than the normal spacing between pulses. Therefore, upon start-up, contacts 56 are closed, relay R being deenergized. Immediately upon start-up, however, relay R is energized and will open contacts 56 unless contacts 53 are opened prior to the normal delay in the actuation of relay R This occurs when the flow of mercaptan begins resulting in pulsing relay R and relay R When the flow of odorant stops prior to the delivery of the desired amount thereof, the pulsing mechanism, specifically disc 47, ceases to operate and the system ceases to pulse. If the system stops with a blank portion of disc 47 between lamp 46 and electrical cell 48, the contacts 53 of relay R remain closed, contacts 51 being open, and relay R opens normally-closed contacts 56. If the pulsing mechanism stops with the cutout portion 49 between the lamp 46 and the photoelectric cell 48, the contacts 53 are maintained open, but since relay R remains energized through contacts 52, the contacts 54 close after a suitable time delay and relay R is actuated to open contacts 56.

To prevent shutdown of the complete system when the pulsing mechanism of the odorant meter stops due to the normal amount of odorant having been delivered,

contacts

57 and 58 are provided as shown and these contacts are opened by the portion of the set stop meter actuated by the odorant flow.

Contacts 59 are actuated by level switch 36 to shut the system down when an insufficient amount of odorant remains in tank 16.

With the system energized and contacts 56 closed, actuation of set stop meter 29 to indicate a desired quantity of flow causes

contacts

61 and 62 to close. Set stop meter 29 comprises a mechanism by which a first register is set to the desired delivery of LPG, thus setting,

through a suitable ratchet mechanism, or electric circuitry, a similar register for the odorant. Each of these registers in set stop meter 29 is mechanically driven mechanism which, when driven to O actuates a suitable contact, contacts 61 being actuated by the odorant, along with

contacts

57 and 58, and contacts 62 being actuated by the LPG.

Therefore, as noted above,

contacts

61 and 62 are closed when set stop meter 29 is set for a desired amount of delivery. Assuming normal operation, delivery continues until the desired amount of odorant is injected whereupon

contacts

61 and 57 and 58 are opened. When the desired amount of LPG has been pumped, contacts 62 open. For normal operation, the odorant flow mechanism is adjusted to deliver the proper amount of odorant in slightly less than the amount of time required to deliver the corresponding amount of LPG. The pulsing circuits of the odorant portion of the set stop meter and to step motor 31 are illustrated schematically by the

coils

63 and 64, respectively.

Relay R actuates contacts 66 in a circuit including starter S for the LPG pump 11. Also in this circuit are contacts 67 which are the normally-open contacts of flow switch 37. Normally-open contacts 68 are actuated by time delay relay 42, contacts 67 and 68 cooperating in the circuit with S in a manner similar to the

contacts

43 and 44 in the control circuit. The switch 69 is shown in the manual position but normally is operated in the automatic position wherein it is connected to the contact 66.

A starter S for the odorant pump 18 includes normally-open contacts 71 which are actuated by relay R Relay R controls contacts 73 to disconnect the circuit for lamp 46.

The contacts 76 represent the contacts of pulsing means 28 and the coil 77 represents the drive for the LPG portion of set step counter 29.

In the embodiment of FIGURE 3, odorant is fed from an odorant tank 81 through an odorant pump 82, driven by motor 83, through a rotameter 84 and injected into the LPG delivery conduit 86. The LPG product is delivered by LPG pump 87 which is driven by motor 88, through positive displacement meter 89. The combined stream fed through delivery conduit 91 divides to provide a first major delivery stream, conduit 92, and a second minor delivery stream, conduit 93. A first control valve 94 is provided in conduit 92 and a second control valve 96 in conduit 93. Rotameter 84 is provided with means for delivering a proportional electrical signal from transmitter 97, the signal being proportional to the position of the rotameter float and, therefore, to the rate of flow therethrough. Rotameter 84 is also provided with a flow alarm switch 98 which is actuated at a predetermined low rate of flow through rotameter 84. The signal from transmitter 97 is fed into a flow integrator transmitter 99, which is in the form of an analog to digital transducer, which produces an output pulse rate proportional to the strength of the signal from transmitter 97. The signal from transducer 99 is fed to a set stop counter 101 and to a ticket printer 102.

Meter 89 produces electrical pulses at a rate proportional to the flow of LPG through the meter and these pulses are transmitted to set stop meter 101 and ticket printer 102.

Set stop meter 101 is similar to set stop meter 29 in the apparatus of FIGURE 1. Ticket printer 102 can be the same as ticket printer 27 of FIGURE 1 or, as illustrated, can be driven by pulses from both LPG and odorant flow rate meters, in which case it would be driven by a mechanical drive from meter 89.

In operation, set stop meter 101 is set for the desired amount of LPG delivery, thus automatically setting the desired amount of odorant to be injected. When the desired amount of odorant has been injected, switch 103 is operated thus stopping motor 83. When the desired total flow of LPG is neared, a switch 104 is actuated, thus closing valve 94, greatly reducing the rate of flow. When the desired total amount has been delivered, switch 106 is actuated, thus closing small valve 96 to stop flow completely. At the same time, pump 87 is shut down by cutting oif motor 88. If the flow of odorant through rotameter 84 at any time prior to delivery of the desired total amount becomes less than desired, switch 98 causes shutdown of the delivery equipment. The shutdown circuit of switch 98 is made inoperative by actuation of switch 103 when a desired total amount has been delivered.

In FIGURE 4 is illustrated a system wherein the odorant flows through a rotameter 111, for actuation of the shutdown function when the rate of flow is low enough to actuate alarm switch 112, and then continues through a positive displacement meter 113 which transmits electrical pulses from transmitter 114 to the set stop counter and ticket printer.

In the control system illustrated in FIGURE 5, there are provided control circuits A and B, pulse circuit C, time delay circuit D and electrical pulse generation circuit E. Pulse circuit C, time delay circuit D and electrical pulse generation circuit E form a part of a VAF meter and pulse transmitting apparatus manufactured by Vloeistofmeetapparatenfabriek N.V., Rotterdam. The control system is suitable for use in connection with the system illustrated in FIGURE 1 and the circuits are suitable for long operating periods at high pulse rates.

Control circuit A includes contacts K-la of relay K-l in circuit C, relay R-11, contacts R-lla of relay R-ll, stepping motor M-Il of a counter, contacts RQa and RQb which are part of reset counter M12, relay R-12, contacts R-12a of relay R-12, contact R15a of relay R-15, relay R-13, contacts R-13a of relay R-13, relay R-14 and contacts R-14a of relay R-14, contacts R-16a of relay R16, relay R-15, stepping motor M-13 of a counter and reset counter M-12 and reset switch S-11.

Control circuit B includes contacts K-Za of relay K-Z, indicator light L-ll, relay R2t), contacts R-lZb, relay R-20, LPG valve V-11, contacts K-lb of relay K-1, relay R21 and relay R21, contacts R-llb of relay R-ll, odorant meter M16 and relay R-14. Contacts R-20a of relay R-20 are in a loading pump shut-down circuit, contacts R-Ztlb in a reheater pump circuit and contacts R-Zlb of relay R-21 in an odorant pump circuit, as shown.

Pulse circuit C includes relay K-l, condensers C-1, C-2 and C-3, and resistors, rectifiers, transistors and filters, as shown.

Circuit D includes relay K-2, contacts K-lb of relay K-l, condensers C-4 and C5 and resistors, rectifiers and transistors and reset switch S-12, as shown.

Circuit E includes contacts R-14a of relay R-14, lamp L-12 and photocell PC-11.

The overall control circuit also includes start switch S-13, time delay relay TDR-ll, contacts TDR-lla and TDR-llb and contacts SW-Il of a flow switch.

In operation, start switch 8-13 is closed, energizing time delay relay TDR-ll, thus closing contacts TDR-llb until flow switch SW-ll is closed by product delivery flow. Circuit E sends pulses to pulse circuit C and thus to time delay circuit D and the entire system is shut down if the pulse rate becomes too slow. This is accomplished by opening of contacts K-Za. When the counter 31 (see FIGURE 1) has totaled the preselected number of pulses representing flow of odorant, the odorant pump is shut down by actuation of relay R14 and contacts R-21b of relay R-21. At the same time the odorant meter is shut down and relay R14 cuts off power to circuit E by opening contacts R-14a. The delivery pump is shut down when the reset counter has reached its preselected total by opening contacts R20a which disconnects the pump circuit, contacts R20b which disconnects the reheater pump and valve V-11 is closed.

6 This also shuts down the odorant pump by actuation of relay R-21 to open contacts R-21b. Relay R-11 is energized from the pulse circuit by contacts K1a and energizing the odorant step motor M-11. Light L-11 is an alarm light indicating odorant failure. Switch S-11 operates the counter reset.

It will be recognized that many of the details of circuits of.FIGURE 5 are not described in detail but the operation of the circuit is readily apparent to one skilled in the art.

Throughout the disclosure, the drawings of mechanical equipment and electrical circuits have been greatly simplified to illustrate the principles of the invention without involving details of a commercial operation which would, of course, require a very great deal of additional description which can readily be supplied by one skilled in the art. Each of the functions of the elements of my invention can be performed by a commercially available item of equipment. The various relays and switches are, of course, too well known to need additional description. The odorant metering and pulsing equipment including meter 19, lamp 46, disc 47, photoelectric cell 48, etc., can be supplied by a VAF combination including a meter and pulse transmitting apparatus, available from Vloeistofmeetapparatenfabriek N.V., Rotterdam, and described in their brochure Volumemeters. The positive displacement meter 13 can be a type W28 positive displacement fiow meter manufactured by A. O. Smith and described in the bulletin 1'26C of the A. O. Smith Corporation. The valve 14 can be a number 590 control valve manufactured by Ralph N. Brodie Company, San Leandro, California. The set stop counters can be separate counters for the odorant and LPG metering, but preferably a single apparatus is used having interconnected odorant and LPG registers to permit setting of both by a single operation. Suitable instruments for use as separate counters or meters are those manufactured by Veeder- Root, Inc., Hartford, Connecticut, for example series 1804, 1601, A180707, A180608, 1697, etc. Preferably, however, two set stop mechanisms are interconnected by a mechanical ratio mechanism, such as a ratchet mechanism, gear mechanism, etc., so that setting the desired amount of LPG also sets the proper amount of odorant. A suitable ticket printer is made by said Ralph N. Brodie Company and two of these printers can be connected together so that a long form ticket can be inserted for simultaneous printing of both LPG and odorant amounts.

The flow alarm or shut down system of FIGURE 4, can, of course, be applied to the complete system as illustrated in FIGURE 1.

Reasonable variation and modification are possible within the scope of my invention which sets forth method and apparatus for incorporating an additive into a fluid which is being dispensed, and for metering the fluid and additive and controlling the amounts delivered and stopping delivery when the additive is not delivered properly.

I claim:

1. A method for supplying an additive to a fluid, comprising the steps of:

transferring a stream of said fluid through a fluid conduit;

introducing said additive into said fluid in said fluid conduit;

metering the flow of said stream of fluid in said fluid conduit and producing a first signal representative of the rate of flow of said stream;

metering said additive introduced into said fluid conduit and producing a second signal representative of the rate of flow of said additive;

integrating said first signal and actuating a first electrical circuit responsive to the occurrence of a first predetermined value of the integration of said first signal;

actuating a second electrical signal responsive to the occurrence of a second predetermined value of the integration of said first signal;

integrating said second signal and actuating a third electrical circuit responsive to the occurrence of a predetermined value of the integration of said second signal; reducing the rate of flow of said fluid responsive to said actuation of said first electrical circuit; v

discontinuing transfer of said fluid responsive to said actuation of said second electrical circuit;

discontinuing the injection of said additive responsive to said actuation of said second electrical circuit when said actuation of said second circuit occurs before said actuation of said third circuit; and

discontinuing the injection of said additive responsive to said actuation of said third electrical circuit when said actuation of said third circuit occurs before said actuation of said second circuit.

2. A method for supplying an additive to a fluid, comprising the steps of:

transferring said fluid through a fluid conduit;

introducing said additive into said fluid in said fluid conduit;

dividing said stream of said fluid into a major delivery stream and a minor delivery stream;

metering the flow of said fluid in said fluid conduit and producing a first signal representative of the flow of said fluid;

actuating a second electrical circuit responsive to the occurrence of a second predetermined value of the integration of said first signal;

integrating said second signal and actuating a third electrical circuit responsive to the occurrence of a predetermined value of the integration of said second signal;

discontinuing transfer of said fluid through said major delivery stream responsive to said actuation of said first electrical circuit;

discontinuing transfer of said fluid through said minor delivery stream responsive to said actuation of said second electrical circuit;

discontinuing injection of said additive responsive to said actuation of said second electrical circuit when said actuation of said second circuit occurs before said actuation of said third circuit; and

discontinuing injection of said additive responsive to said actuation of said third electrical circuit when said actuation of said third circuit occurs before said actuation of said second circuit.

3. A method for supplying an additive to a fluid, comprising the steps of:

transferring said fluid through a fluid conduit;

introducing said additive into said fluid in said fluid conduit;

metering the flow of said fluid in said fluid conduit and producing a first signal representative of the rate of flow of said fluid;

integrating said first signal and actuating a first electrical circuit responsive to the occurrence of a predetermined value of the integration of said first signal;

integrating said second signal and actuating a second electrical circuit responsive to the occurrence of a predetermined value of the integration of said second signal;

discontinuing transfer of said fluid responsive to said actuation of said first electrical circuit;

discontinuing injection of said additive responsive to said actuation of said first electrical circuit when said actuation of said first circuit occurs before said actuation of said second circuit; and

discontinuing injection of said additive responsive to said actuation of said second electrical circuit when said actuation of said second circuit occurs before said actuation of said first circuit.

4. Means for dispensing a fluid and for supplying an additive there-to, comprising:

a fluid transfer conduit;

a pump to transfer a stream of said fluid through said fluid conduit;

means to introduce said additive into said fluid conduit;

means to divide said stream of said fluid into a major delivery stream and a minor delivery stream;

a first control valve in said major delivery stream;

a second control valve in said minor delivery stream;

means to stop flow of said additive;

first set stop counter means having a first switch to actuate said first control valve to closed position at a first predetermined value and a second switch to actuate said second control valve to closed position, stop said pump and actuate said means to stop flow of said additive at a second predetermined value;

second set stop counter means to actuate said means to stop flow of said additive at a third predetermined value;

a first fluid meter for said stream in said fluid conduit;

means actuated by said first fluid meter to produce electrical pulses at a rate proportional to the rate of flow of said stream in said fluid conduit and to transfer said pulses to said first set stop counter means to actuate said first counter means to count said pulses;

means actuated by said first fluid meter to actuate a first ticket printing counter;

a second fluid meter for said means to introduce said additive into said fluid conduit; and

means actuated by said second fluid meter to produce electrical pulses at a rate proportional to the rate of flow of said additive and to transfer said pulses to said second set stop counter to actuate said second counter to count said pulses, and to second ticket printing means.

5. Means for dispensing a fluid and for supplying an additive thereto, comprising:

a fluid transfer conduit;

means to introduce said additive into said fluid conduit;

means to stop flow in said major delivery stream;

means to stop flow in said minor delivery stream;

means to stop flow of said additive;

first set stop counter means having a first switch to actuate said means to stop flow in said major delivery stream at a first predetermined value and a second switch to actuate said means to stop flow in said minor delivery stream, stop said means to transfer said fluid through said fluid conduit and actuate said means to stop flow of said additive at a second predetermined value;

first fluid meter means for said stream in said fluid conduit;

means actuated by said first fluid meter means to actuate said first set stop counter means to integrate the flow of said fluid;

a second fluid meter means for said means to introduce said additive into said fluid conduit; and

means actuated by said second fluid meter means to integrate the flow of said additive and to actuate said 9 second counter means responsive to said integrated value of said flow of said additive. 6. Means for dispensing a fluid and supplying an additive thereto, comprising:

a fluid transfer conduit;

a pump to transfer a stream of said fluid to said fluid conduit;

an additive conduit communicating with said fluid conduit;

an additive pump to force additive through said additive conduit into said fluid conduit;

a major delivery stream conduit communicating with said third conduit;

a minor delivery stream conduit communicating with said fluid conduit;

a first control valve in said major delivery stream conduit;

a second control valve in said motor delivery stream conduit;

a first electrical switch to actuate said first control valve to closed position;

a second electrical circuit to actuate said second control valve to closed position, stop said pump to transfer said fluid and stop the additive pump;

a third electrical circuit to stop said additive pump;

first set stop counter means having a first switch to actuate said first electrical circuit at a first predetermined value and a second switch to actuate said second electrical circuit at a second predetermined value;

second set stop counter means having a switch to actuate said third electrical circuit at a third predetermined value;

a first positive displacement meter for said stream in said fluid conduit;

means actuated by said first positive displacement meter to produce electrical pulses at a rate proportional to the rate of flow of said stream in said third conduit and to transfer said pulses to said first set stop counter means to actuate said first counter to count said pulses;

a second positive displacement meter for said means to introduce additive into said fluid conduit;

means actuated by said second fluid meter to produce electrical pulses at a rate proportional to the rate of flow of said additive and to transfer said pulses to said second set stop counter means to actuate said second counter to count said pulses;

a floW switch in said fluid conduit;

means actuated by said flow switch to discontinue transfer of said fluid when the flow in said flow conduit falls below a predetermined value;

a tank for said additive;

a level switch associated with said tank to discontinue transfer of said fluid When the level in said tank falls below a predetermined minimum value; and

means actuated by the rate of flow of said additive to discontinue transfer of said fluid when said rate of flow of said additive falls below a predetermined minimum value.

References Cited by the Examiner UNITED STATES PATENTS 2,540,618 2/1951 Hazard 22226 2,952,209 9/1960 Scholin 222-66 X 3,042,258 7/1962 Mayes 22266 LOUIS J. DEMBO, Primary Examiner.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No 3 225 962 December 28 1965 Robert E. Loebeck It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

In the grant, line 1, and in the heading to the printed specification, line 4, name of inventor, for "Robert E. Leobeck", each occurrence, read Robert E. Loebeck in the heading to the four sheets of drawings, line 1, for "R. E, LEOBECK", each occurrence, read R. E, LOEBECK column 9, line 18, for "motor" read minor Signed and sealed this 10th day of January 1967.

(SEAL) Afloat:

ERNEST W. SWIDER EDWARD J. BRENNER mating Officer Cner ofPatents

Claims

1. A METHOD FOR SUPPLYING AN ADDITIVE TO A FLUID, COMPRISING THE STEPS OF: TRANSFERRING A STREAM OF SAID FLUID THROUGH A FLUID CONDUIT; INTRODUCING SAID ADDITIVE INTO SAID FLUID IN SAID FLUID CONDUIT; METERING THE FLOW OF SAID STREAM OF FLUID IN SAID FLUID CONDUIT AND PRODUCING A FIRST SIGNAL REPRESENTATIVE OF THE RATE OF FLOW OF SAID STREAM; METERING SAID ADDITIVE INTRODUCED INTO SAID FLUID CONDUIT AND PRODUCING A SECOND SIGNAL REPRESENTATIVE OF THE RATE OF FLOW OF SAID ADDITIVE; INTEGRATING SAID FIRST SIGNAL AND ACTUATING A FIRST ELECTRCAL CIRCUIT RESPONSIVE TO THE OCCURRENCE OF A FIRST PREDETERMINED VALUE OF THE INTEGRATION OF SAID FIRST SIGNAL; ACTUATING A SECOND ELECTRICAL SIGNAL RESPONSIVE TO THE OCCURRENCE OF A SECOND PREDETERMINED VALUE OF THE INTEGRATION OF SAID FIRST SIGNAL; INTEGRATING SAID SECOND SIGNAL AND ACTUATING A THIRD ELECTRICAL CIRCUIT RESPONSIVE TO THE OCCURRENCE OF A PREDETERMINED VALUE OF THE INTEGRATION OF SAID SECOND SIGNAL; REDUCING THE RATE OF FLOW OF SAID FLUID RESPONSIVE TO SAID ACTUATION OF SAID FIIRST ELECTRICAL CIRCUIT; DISCONTINUING TRANSFER OF SAID FLUID RESPONSIVE TO SAID ACTUATION OF SAID SECOND ELECTRICAL CIRCUIT; DISCONTINUING THE INJECTION OF SAID ADDITIVE RESPONSIVE TO SAID ACTUATION OF SAID SECOND ELECTRICAL CIRCUIT WHEN SAID ACTUATION OF SAID SECOND CIRCUIT OCCURS BEFORE SAID ACTIATION OF SAID THIRD CIRCUIT; AND DISCONTINUING THE INJECTION OF SAID ADDITIVE RESPONSIVE TO SAID ACTUATION OF SAID THIRD ELECTRICAL CIRCUIT WHEN SAID ACTUATION OF SAID THIRD CIRCUIT OCCURS BEFORE SAID ACTUATION OF SAID SECOND CIRCUIT.