US1932582A

US1932582A - Gas sampling apparatus

Info

Publication number: US1932582A
Application number: US191911A
Authority: US
Inventors: Gaylord H Halvorson
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-05-16
Filing date: 1927-05-16
Publication date: 1933-10-31
Anticipated expiration: 1950-10-31

Description

t 31, 1933- G. H.HALvoRsoN GAS SAMPLING' APPARATUS Filed May 16, 192'?` rlI-IIIIIH.

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Patented Oct. 31, 1933 UNITED STATES 3 Claims.Y

The invention pertains. to a gas sampling ap-` paratus, and moreparticularly to one for taking samples of a gas at predetermined intervals during` a long. determined period; of time.,

An object of. the invention is to providefa. simple, inexpensive. and' compact gas samplingl apparatus. for intermittently sampling gas for any suitable and chosenperiod of time.

Another object', is to provide a. device to obtain a uniform pressure in a part', thereof preceding the gasr sampling container regardless of any line pressure that may exist.` l

Stilll another object. is to provide a device to bleed gas in` suicient quantitiesv so that a representative sample is obtained even though the sampling apparatus may be located at some. distance from the gasv main.

A further object is to provide a gassampling device to, sample a representativey amount ofgas from a main, said device being of such character that there can be no backing up of iluids in the device.

With these and' various other objects in'view, the invention may consist of certain novel features of construction and operation, as willbe 4more fully described and particularly pointed out in the specification, drawing and claims appended hereto.

In the drawing, the gure is a Ymoreoruless diagrammatic sectional elevation of certain parts ofY the. device.

A gas inlet pipe 1 communicates through aV one-Way Water seal 2 to a ,substantiallyV W-

shaped pipe

3, 4, 12. its center leg 4 extending into a containerY receptacle 5 which isA sealed by any suitable means, as plug 25', except for apertures for the inlet and outlet connections. Said container has a oat valve 6 movable on suitable guides 6l and hasr a mercury seal 6a in the top thereof. Said valve, cooperates with a Vgas overflow or waste pipe 8 Which is connected through a one-Way water seal 9 to'the exhaust pipe 10 communieatingv with the atmosphere. From adjacent the bottom of the container 5, there extendsa waste.

thereto. l

The other leg 12 of the W-shaped pipe is connected to a pipe 14 by meansV of a one-Way Water seal 13', the pipe 14 'communicating to a containerv 16 through any suitable plug or sealing means 26. This pipe 14 is provided with any shut-01T The W-shaped" pipe has' control, such as a pinch valve 15- ior` controlling the owof' gasV to this containerv r6. The container 16` is4 'connected' by a suitable pipe l'lf' ex- PATENT y carica tending adjacent the bottom of the container 16 e0 and which includes a lflexible part 1'7a and communicates with a movablefcontainer 18 through a. sealing plug 27', said'pipe extending to points adjacent thebottom of both of

thev containers

16 and 18. The containerv 16 is also provided with a gas outlet pipe 20 provided with any con-r trol' cock 20a'. Thev vcontainer 18 is raised or lowered through any suitable time operating means, such as a. clock-drurnj-cable arrangement as; indicated at 19` and the container' may be guidedv between suitable iixed guides 2'1 posi-- tioned on the base 24M-the device, the container having suitable spacers 22 of *anyl construct-ion, such as will allow,` free sliding movement ofthe container 18. This contain-er 18 is also provided with anair vent 23 inthetop thereof.`Y

It will also be noticed that one-way water seals are provided with the sealing' plugsy 28, 29 and' 30fi'n the seals 2', 9= and 13 respectively, said plugs being suitably apertured to provide for their respective -inlet and outlet pipes. It will also be seen that when the valve 6l seals the gas outlet pipe 8 that there is established a head A wh-ich is greater than that headffestablished at B by the water levels of the containers 18- and 16.

In operation, gas to besampled ilows from the*v source through the inlet pipey 1 through' the water seal 2 up into the pipes. From there it flows into pipe 4 into the container-f' 5. Also, a portion thereof will" flow through the branch 12v into the waterseal` 13, but will not flow into the sampling container-16 as that container is full of Water, or the cock.V 15 can be closed until iiowis established through container 5. At thesamey timethat the gasv is introduced into the container 5, at a substantially constant rate water is being introduced. to said container through the pipe 111-. This water will graduallyl raise thel float valve 6- in such time vthat it seals the gas outlet pipe 8. Before this is s sealed, the gas will 110W through the pipe 4 out of' the pipe 8 through the water seal 9 andout tha exhaust pipe 1'0, this: being aline of lessr resistance than through the pipe 12 through the water seal 13 through the pipe 1-4 yand into the' container 16 where it would Vhave to: displace' water in that container tothe then raised'Y container 18?.A

As the-water rises and sealsthe pipeV Sthrough the valve 6 and the mercury-seal Sethereofr, the inowing gas and water build. up` a: pressure oi' the gas trapped in the container 5 to a point whereby a siphon is caused to be formed between the con@ tainer and the pipe 7, which will empty this container 5. The siphon determines the head A and this head means that during each cycle, a gas pressure of A is applied to the line 3 regardless of this line pressure. The gas pressure in the line or branch outlet 3 normally balances the head of water B between the movable and

xed containers

18 and 16 respectively, at the seal 13. When, however, the oat 6 is raised by the water entering thecontainer 5, thereby sealing the gas waste pipe 8, the pressure of A is maintained in pipe 3, this pressure A being determined greater than the pressure represented by the constant head B.

The pressure then in

lines

3, 12 will overcome the pressure caused by head B, causing the 'gas to flow through the seal 13 into the pipe-liand kif the pinch valve is opened, into the container' 16 displacing water into container 18. A continued flow. o1 gas will continually displace the water in this container causing it to flow through the pipe 17 through .the flexible connection 17e and into the container 18. 4The water head B isfrhaintained constant by lowering theI container Y18 by means of the clock arrangement y19, which is timed to correctly operate the conti`ner.V This is an established head lso that there will befa proper flow from container `16 tocontain'er 18, the head B being less than headA,` it being necessary 'that this condition exists at the time the valve 6 seals to prevententrance of gas to'contaiyner 5.

It will b e seenthat the water entering the container 5 willL intermittently operate the .valve 6 to close the overiiowpipe 8; therefore', the gas will only intermittently flow to the container 16,

which means that gas is periodicallytakren from `the main into *the container 16 and there drawn onc at will through the pipe In collectinga sample of the' gas by displacement of water, .it will. be seen that it is necessary to have .a uniform flow of water from the gas Vsarnpling container 1,6 to the, movable or water receiving container 18, and as .the introduction of the gas dependsupon.audiiierence in the heads A and B, vit is therefore necessary to` carry a back; pressure in the container 16 so that pressure diiferential is such that an amount oiv gas passes ther seal 13 `at each interval proportionate to thel drop .Y

of the movable container during thatinterval. This back pressurevaries withthe .lengthof time between the applicationsof pressureinline 3... This meansthat it'vdep'ends upon the rate of flow of water intothe container 5 and'should be adjusted ,when the apparatusis started lso that no,- change .takes place duringthe sampling, operation. .lf, vthe .apparatusvis,starteduwithtoo high i a baclg. pressure, a smaller amount of gas passes ftheseal 13 at each interval until the proper back f pressure is established, By operating the apparatus a short time (until an equilibrium has been established), the correct back pressure has been determined for any rate ofilow of water with the same back pressure throughout the sampling period. The rate of flowoi the gas into the Agas sampling bottle mustbe uniform at alltirnes.` f

With sampling low pressure gas, such as pro-.

ducer gas, or when sampling gas caused bytast'tck` draft such asiue gas, the operation is slightly different. ,At such times, the gasvis drawn intov the container 5 by thesuctionjproduced when the water is removed through the pipe 'l` due to the siphon action. When the siphon isbroken, the gas is forced through the outlet Aas the incomingy water builds up in thecontainer.l This continues until the float 6 rises and the mercury seal 6a closes the outlet of the pipe 8, when the incoming water builds up the pressure of the trapped gas to A, causing the siphon to again form.

It will be seen that with the water seals, the gas is only allowed to flow one way, as indicated by the arrows, so that gas coming from pipe 1 can only go to the pipe 3 and not in a reverse direction; gas canonly go from pipe 8 to pipe 10, and similarly, gas can only go from pipe 12 to the pipe 14.

I do not wish to be limited by the exact apparatus or operation shown and described as other and various forms will be apparent to those skilled in the art.

I claim:

'1.' In gas sampling apparatus, the combination of a pair oi' gasreceiving containers, the second of said containers being normally lled with water, a vconnection from a source of supply to each of said containers, means for preventing flow from the second of said containers to the first container for supplying water thereto, an outlet from said container, said outlet being disposed to form a Siphon whereby said container' "rst of'said containers, a water inletinto'said v to close the exhaust from said container'whereby f the Siphon is set up to form an ecective head to cause supply of gas to said second container, a movable receptacle connected to said secondcontainer whereby Water may be forced into said receptacle bygas supplied to said second con- `tainer, means for moving said receptacle -at a sesupplied to said second container,V and a gas'Y draw-off connection from said second container.

2. Ina gas sampling device, the combination of a pair oi connected containers, one of said containers'having an inlet connection'ior admitting liquid thereto, saidcontainers being connected by inlet. means for introducing gas serially 'to said containers, 'a Siphon outlet for draining liquid from said first-named containenan outlet connection for normally'conducting said gas from said first-named container, and a member controlled by the liquid level in said iirst-narned container forcausing said gas to be supplied throughsaid inlet nieans' to said second-named container.

' 3. In a gas sampling device, the "combination" to said containersa Siphon outlet for draining f liquid from said first-named containenan outlet connection lfor normally conducting said gas from said first-named container, and a member `controlled by the liquid level in said inst-'named container for causing said gas tobe supplied throughfsaid inlet means to said second-,named container, continued supplyot liquid causing said Siphon to dischargeliquid from said first-named container whereby said member is operatedto cause the gas to be supplied to said rst-naiiied container.

GAYLORD I-I. HALVORSON;