CA1141989A - Steam trap arrangement comprising a steam trap and a fluid flow monitor in a steam flow line - Google Patents

Steam trap arrangement comprising a steam trap and a fluid flow monitor in a steam flow line

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Publication number
CA1141989A
CA1141989A CA000327755A CA327755A CA1141989A CA 1141989 A CA1141989 A CA 1141989A CA 000327755 A CA000327755 A CA 000327755A CA 327755 A CA327755 A CA 327755A CA 1141989 A CA1141989 A CA 1141989A
Authority
CA
Canada
Prior art keywords
chamber
baffle
outlet
condensate
inlet
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.)
Expired
Application number
CA000327755A
Other languages
French (fr)
Inventor
Robert E. Bridges
Raymond K. Fear
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Spirax Sarco Ltd
Original Assignee
Spirax Sarco Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Spirax Sarco Ltd filed Critical Spirax Sarco Ltd
Application granted granted Critical
Publication of CA1141989A publication Critical patent/CA1141989A/en
Expired legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L11/00Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Measuring Fluid Pressure (AREA)
  • Separating Particles In Gases By Inertia (AREA)

Abstract

ABSTRACT
A fluid flow monitor for use in a steam flow line and comprising a chamber (1) in which condensate can collect and a single baffle (5,50) between an inlet (2) and an outlet (3) of this chamber. The baffle is disposed such that a steam flow induced pressure drop at the chamber outlet results in rise in condensate level on the outlet side of the baffle and corresponding fall on the inlet side. The monitor further comprises means for detecting change in condensate level constituted by a single electrode (8) extending into the interior of the chamber, this electrode being electrically insulated from an electrically conductive area (9) exposed to the collected condensate and positioned such that in use change in condensate level to a predetermined extent breaks an electrically conductive path from the electrode via the condensate to the conductive area.
The need for sight glasses which are easily dirtied and require skill in use is avoided and the monitor described is of simple construction.

Description

A STEAM TRAP ARRA~IGEME~T COMPRISING A STEAM TRAP
AND A F~UID F~OW M~NITOR IN A STEAM FLOW LINE
This invention relates to fluid flow monitors for use in steam flow lines, and to a steam trap arrangement comprising a steam trap and such a fluid flow monitor.
Commonly used fluid flow monitors rely on observa-tion of the conditions in the flow line upstream or down-stream of the steam trap, through a glass window (a so-called sight glass) and skill is required to interpret whatis observed. Furthermore the glass frequently becomes dirty making observation difficult or impossible.
~n aspect of the invention is as follows:
~ steam trap arrangement comprising a steam trap and a fluid flow monitor in a steam flow line which includes the steam trap, the monitor comprising a chamber having an inlet and an outlet, the outlet connected to an inlet of the steam trap so that flow of steam to be trapped is via the monitor, said chamher having a receptacle region for conden-sate, the monitor further comprising a single baffle mountedin the chamber between the inlet and the outlet such that the baffle extends into said receptacle region and such that a steam flow induced pressure drop at the outlet of the chamber, when the arrangement is operatively connected in a flow line, results in a rise in the level of the collected condensate on the outlet side of the baffle with a corresponding fall in the level of the collected conden-sate on the inlet side of the baffle, the monitor further i .

comprising means for ascertaining a change in the conden- -sate level to a predetermined extent brought about by the steam flow induced pressure drop at the outlet resulting from loss of steam at the trap, said change ascertaining means comprising a single electrode extending into said receptacle region of the chamber in which condensate can collect, and means defining an electrically conductive area exposed to the collected condensate, said electrode being electrically insulated from said conductive area means and positioned with respect thereto such that when the arrangement is operatively connected in a flow line a change in condensate level to a predetermined extent brought about by a pressure drop at the outlet breaks an electrically conductive path from the electrode via the condensate to the electrically conductive area.
A fluid flow monitor as now proposed cannot become obscured by dirt, does not have to be fitted in line of sight, and requires no skill in use. Moreover the particular monitor herein proposed is of simple and compact design.
For a better understanding of the invention and to show how the same may be carried into effect reference will now be made, by way of example, to the drawing accompany-ing this specification in which:
Figure 1 is a schematic sectional side view of a first form of fluid flow monitor illustrated in a first operating condition, Figure 2 is a similar view of the monitor of Figure 1 b~t illustrated in a second operating condition, Figure 3 is a schematic sectional side view of a second form of a fluid flow monitor illustrated in the same operating condition as the first form of monitor is shown in Figure 1, and Figure 4 is a schematic sectional side view of the monitor o~ Figure 3 but shown in the same operating condition as is the ~irst ~orm in Figure 2.
The ~luid ~low monitors o~ the Figures each include a chamber.l having an inlet 2 and an outlet ~
3 whereby the chamber can be connected in a steam .i flow line to serve as a receptacle ~or condensate 4. ~$
In the.detector of Figures l and 2 the inlet and outlet are in the upper part of the chamber so that condensate - ~
can collect in the lower.part of the chamber, this "t detector being ~or insertion in a horizontal pipe run.
In the detector o~ Figures l.and 2 there is between the `~
inlet 2 and the outlet 3 ~ single baffle 5 that depends ~rom the upper wall of thè chamber l into the chamber part '`.7 in which the condensate can collect, this baffle 5 terminating short of the bottom of the chamber and .
having a 1;hrough aperture 5A at substantially the same level as t;he level o~ the..lnlet andoutlet 2 and 3.
In the ~orm shown the baiile 5 i.s vertical but it could . ~, be inclined, for example towards; the inlet 2 ~n the direction ~rom its top edge towards its~ree lower edge. ~.
In the wall oi the part of the chamber l in which condensate can collect there is a single electrode 6 supported in an electrically conductive ~ounting 7 so as to be electric~,lly insulated from the ii' mounting 7 and.henoe also from the remainder of the chamber ~;
l. The electrode 6 projects into.the interior o~ the ~^3, chamber, at a position, in that part ~ the cham~er in which condensate can collect, that is between the ba~le 5 30 . and the.inlet 2, and that is below the level of the inlet and outlet 2 and 3.
The monitor o~ Figures 3 and 4 has its inlet
2 at the top of the chamber l and its outlet 3 at the bottom o~ the chamber l. This monitor is ~or insertion in vertical pipe runs, the outlet 3 being connected to an upright extension duct 3A the upper end of which dbtermines the level to which the condensate 4 can collect `~
' . ::

' '' ' ~ ' ' ''' in the chamber 1. This duct 3A is within a single upright bai'~le 50 i'ormed by a casing standing on the bot~om o~ the chamber 1 and containing the duct 3A with clearance between the duct and the casing.
A part of the upright wall o~ the casing terminates, at 8, short o~ the bottom o~ the chamber 1 and the casing ~^
50 has a through aperture 50A in its otherwise closed upper end. :i .As in the case of the monitor of Figures 1 and 2, 3 in the monitor of Figures 3 and 4 there is, in the wall oi the part of the chamber 1 in which condensate `~
can collect, a single electrode 6 and mounting 7 as described above, the electrode projecting into the interior of the chamber 1 at a position that is below the upper end of the outlet extension duct 3A. The - electrically conductive mounting 7 is exposed to this part o~ the interior of the chamber.
In each ~orm the electrode 6 and mounting 7 are ~l in circuit with a power source, such as a dry battery, and `,¦
indicator lights 9 in a control box 10, the circuit being such that one of the lights (which can be a green light) is illun~nated i~ the clrcuit is~ completed because the electrode is submerged in condersate giving an electi~ally conductive path ~rom the electra,de to the mounting via the condensate, whereas another light (which can be red) is illuminated if the electrode is not submerged and the path just mentioned is therêfore brokenl.
It will be appreciated that the control box~10 does not have to be permanently connected to the electrode 6 and its mounting 7 o-~ any one monitor, and that one control box can be connected to any number o~ monitors in turn to test whether condensate is present to electrode level. Alternatively, several monitors can have their electrodes and mountings connected to one centra~ control panel.
Alternative means such as a powered meter can be used to check whether there is an electrically conductive patb between the electrode and its mounting.

38~

A monitor at an inaccessible position can have ~lying leads permanently attached and termina-ting at a more accessible point.
Figure 1 illustrates the monitor as i~ in use w~th its outlet 3 connected to the inlet o~ a steam trap so that the ilow of steam to be trapped is via the monitor. As shown in ~igure 1, when the steam trap is shut condensate is present in the chamber 1 to the same level (in line with the inlet ? ) on either side -of the ba~le 5 and the electrical circuit including ~
the electrode 6 and its mounting 7 is completed via ~j this condensate. ~ 1 A small amount oi steam will be condensing in the body o~ the steam trap and in the fittings between the ~3 trap and the monitor. To make up this loss a similar ~
amount of steam can pass through the aperture 5A near the , top o~ the baifle 5 without disturbing the condensate levels on either side of the bai~le. l¦
If more condensate ilo~vs to the trap, causing it ~l to ope~, the monitor chamber becomes ~looded. Even if there is only a dribble o~ condensate ~lowing through the trap, this is sui~icient to keep the level in the monitor chamber above the electrode.
I~, however, more steam passes through the trap ;~
than is normal due to condensation losses (i.e. steam is à
ieaking away), a pressure drop is induced at the monitor chamber outlet 3 by this flow of steam which results ;
in a rise in level of the collected condensate 4 on ~`
the downstream (outlet 3) side of the bà~fle 5 and a ~.
corresponding iall in condensate level on the upstream ~inlet 2) side o~ the ba~fle 5, condensate flowing under the baffle 5 from the inlet side to the outlet side. ;~
When the condensate level on the inlet side drops below the level o~ the electrode (Figure 2) the electrically conductive path ls broken and there is thus obtained at the control bog an indication o~ the occurrence o~ the pressure drop. In each case there ~s thus obtained an indication o~ the le~k that has brought the pressure drop ~ i ~ 1:

8~

about. Thus the flow of steam through the steam line to the trap can be monitored.
The water level upstream of the baffle 5 is depressed to below the electrode 6 even if a quantity of condensate is passing together with the leaking steam.
For 'qxample, if lOOkg/hr of condensate is being discharged ~' but the steam trap is stuck open so that it is passing this load and leaking say 20 kg/hr of live steam, then ;~, the water level in the monitor would be depressed and the ~, pressure drop, and hence the leak, would be indicated.
As is illustrated in Figures 3 and 4, the `~, monitor herein illustrated operates in a similar manner ' to that illustrated in Figures 1 and 2. The outlet 3 is '5 connected to the ~nlet of a steam trap so that the flow of steam to be trapped is via the monitor. As is shown in Figure 3, when the steam trap is shut condensate is ,~
present in the chamber 1 to the same level (in line with the -~
inlet of the extension duct 3A) on either side of the '~
baffle 50 and the electrical circuit including the electrode 6 and its mounting 7 is completed via this ~`
condensate. ` ;,~
To make up the loss of t,he small amount of steam that will be condensing in the body of the steam trap and in the fittings between the trap and the monitor ~3 ~5 ,a similar amount o~` steam can pass through the aperture 50A and into the duct 3A without disturbing the ~, condensate levels on either side of the baffle 50.
Pressure drop induced at the duct 3A by flow o~ steam th~t is leaking away results, as shown in Figure 4, ;
in a rising level of the collecting condensate on the downsteam side of the baffle 50 (i.e. within the baffle 50)and a corresponding fall in condensate level on the upstream side of the baffle (i.e. outside the baffle~, condensate flowing under the baffle 50 from the inlet side to the outlet side where the baffle terminates, at 8, short of the bottom o~ the chamber 1. , '~i ' .... .

In a modified form of the monitor of , Figures 3 and ~ (not illustrated) the upright extension duct is at one side o~ the chamber and the.single baffle is between the duct and the other side of the chamber, I
the baffle comprising an upright part depe~ding from a pa~titicn ~' that is above the upper end of the extension duct, the upright part terminating short of the bottom of the part of the chamber in which condensate collects, there being a clearance between the upright part/partition `, and the duct, ahd the partition having a through ~'.
aperture. Operation is as described ~or Figures `:
3 and 4.

.
,1 'I
~
.~

~ . .

. ~;
.

.

-. .

Claims (12)

WHAT IS CLAIMED IS:
1. A steam trap arrangement comprising a steam trap and a fluid flow monitor in a steam flow line which includes the steam trap, the monitor comprising a chamber having an inlet and an outlet, the outlet connected to an inlet of the steam trap so that flow of steam to be trapped is via the monitor, said chamber having a receptacle region for conden-sate, the monitor further comprising a single baffle mounted in the chamber between the inlet and the outlet such that the baffle extends into said receptacle region and such that a steam flow induced pressure drop at the outlet of the chamber, when the arrangement is operatively connected in a flow line, results in a rise in the level of the collected condensate on the outlet side of the baffle with a corresponding fall in the level of the collected conden-sate on the inlet side of the baffle, the monitor further comprising means for ascertaining a change in the conden-sate level to a predetermined extent brought about by the steam flow induced pressure drop at the outlet resulting from loss of steam at the trap, said change ascertaining means comprising a single electrode extending into said receptacle region of the chamber in which condensate can collect, and means defining an electrically conductive area exposed to the collected condensate, said electrode being electrically insulated from said conductive area means and positioned with respect thereto such that when the arrangement is operatively connected in a flow line a change in condensate level to a predetermined extent brought about by a pressure drop at the outlet breaks an electrically conductive path from the electrode via the condensate to the electrically conductive area.
2. An arrangement as claimed in claim 1, wherein said electrical indication is obtained at an indicator means comprising a source of electrical power and a visual indicator powered from this source in dependence upon making or breaking of said conductive path.
3. An arrangement as claimed in claim 2, wherein said indicator means is permanently connected to said conductive path.
4. An arrangement as claimed in claim 2, wherein said indicator means is detachably connected to said conductive path.
5. An arrangement as claimed in claim 2, wherein said indicator means is common to a plurality of said monitors.
6. An arrangement as claimed in any one of claims 2, 3 or 4, wherein said visual indicator comprises lights that are selectively illuminated in dependence upon making or breaking of the conductive path of the or each monitor.
7. An arrangement as claimed in any one of claims 1, 2 or 3, wherein said inlet and said outlet are horizontally opposed, and wherein the baffle depends from an upper wall of said part of the chamber in which condensate can collect, the baffle terminating short of the bottom of this chamber part and having a through aperture that is on substantially a common level with said inlet and said outlet.
8. An arrangement as claimed in any one of claims 1, 2 or 3, wherein said inlet and said outlet are horizontally opposed, and wherein the baffle depends from an upper wall of said part of the chamber in which condensate can collect, the baffle terminating short of the bottom of this chamber part and having a through aperture that is on substantially a common level with said inlet and said outlet, and wherein the baffle is vertical.
9. An arrangement as claimed in any one of claims 1, 2 or 3, wherein said inlet and said outlet are horizontally opposed, and wherein the baffle depends from an upper wall of said part of the chamber in which condensate can collect, the baffle terminating short of the bottom of this chamber part and having a through aperture that is on substantially a common level with said inlet and said outlet, and wherein the baffle is inclined to the vertical.
10. An arrangement as claimed in any one of claims 1, 2 or 3, wherein said inlet and said outlet are horizontally opposed, and wherein the baffle depends from an upper wall of said part of the chamber in which condensate can collect, the baffle terminating short of the bottom of this chamber part and having a through aperture that is on substantially a common level with said inlet and said outlet, wherein the baffle is inclined to the vertical, and wherein the baffle is inclined towards said inlet in the direction from the top of the baffle towards the lower free edge of the baffle.
11. An arrangement as claimed in any one of claims 1, 2 or 3, wherein said inlet is at the top of said part of the chamber in which condensate can collect, and said outlet is at the bottom of this part, wherein the outlet is connected to an upright duct that is within said chamber part so that the upper end of this duct determines the level to which condensate can collect in the chamber; and wherein the baffle has an upright part at least part of which terminates short of the bottom of said chamber part, and a part above the extension duct that has a through aperture;
there being clearance between the duct and the baffle.
12. An arrangement as claimed in any one of claims 1, 2 or 3, wherein said inlet is at the top of said part of the chamber in which condensate can collect, and said outlet is at the bottom of this part; wherein the outlet is connected to an upright duct that is within said chamber part so that the upper end of this duct determines the level to which condensate can collect in the chamber;
and wherein the baffle has an upright part at least part of which terminates short of the bottom of said chamber part, and a part above the extension duct that has a through aperture; there being clearance between the duct and the baffle, and wherein the baffle is constituted by an upright casing standing on the bottom of said chamber part and containing said upright duct with clearance between the duct and the casing, part of the upright wall of the casing constituting said part that terminates short of the bottom of the chamber and the casing having a through aperture in its otherwise closed upper end, which upper end constitutes said part that is above the exten-sion duct.
CA000327755A 1978-05-30 1979-05-16 Steam trap arrangement comprising a steam trap and a fluid flow monitor in a steam flow line Expired CA1141989A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB24338/78 1978-05-30
GB2433878 1978-05-30

Publications (1)

Publication Number Publication Date
CA1141989A true CA1141989A (en) 1983-03-01

Family

ID=10210155

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000327755A Expired CA1141989A (en) 1978-05-30 1979-05-16 Steam trap arrangement comprising a steam trap and a fluid flow monitor in a steam flow line

Country Status (19)

Country Link
JP (1) JPS54157333A (en)
AR (1) AR218976A1 (en)
AU (1) AU522592B2 (en)
BE (1) BE876501A (en)
BR (1) BR7903280A (en)
CA (1) CA1141989A (en)
CH (1) CH632577A5 (en)
DE (1) DE2920520A1 (en)
DK (1) DK224679A (en)
ES (1) ES481114A1 (en)
FR (1) FR2427593A1 (en)
IL (1) IL57334A0 (en)
IN (1) IN150843B (en)
IT (1) IT1120926B (en)
MX (1) MX148213A (en)
NL (1) NL7904222A (en)
NZ (1) NZ190404A (en)
SE (1) SE438545B (en)
ZA (1) ZA792203B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5855717A (en) * 1981-09-29 1983-04-02 Tlv Co Ltd Measuring device for flow rate
JPS6018400U (en) * 1982-11-12 1985-02-07 新日本製鐵株式会社 Multi-stage steam condensate discharge device
JPH0637959B2 (en) * 1984-10-17 1994-05-18 株式会社ミヤワキ Steam trap operation monitoring method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1727254A (en) * 1924-09-23 1929-09-03 Shotter George Frederick Apparatus for measurement of the level and flow of liquids and the height or movement of a body
US2017435A (en) * 1933-10-16 1935-10-15 Ey Victor Pressure gauge
GB439151A (en) * 1934-05-25 1935-11-29 Corning Glass Works Improvements in differential pressure gauge tubes
DE812119C (en) * 1949-08-05 1951-08-27 Bopp & Reuther Gmbh Volume measuring system based on the pressure difference measurement method for siphon lines and suction lines of centrifugal pumps
JPS5215561Y2 (en) * 1971-06-24 1977-04-08
US3905385A (en) * 1974-04-29 1975-09-16 Edwin Laurence Green Steam trap
DE8300130U1 (en) * 1983-01-05 1983-06-09 "Kustan" Kunststoff-Industrieanlagen GmbH, 4300 Essen WATER POT FOR GAS PIPES

Also Published As

Publication number Publication date
ZA792203B (en) 1980-05-28
IN150843B (en) 1982-12-25
SE7904695L (en) 1979-12-01
FR2427593B1 (en) 1983-02-25
IT1120926B (en) 1986-03-26
FR2427593A1 (en) 1979-12-28
DK224679A (en) 1979-12-01
MX148213A (en) 1983-03-25
AU4688879A (en) 1979-12-06
DE2920520A1 (en) 1979-12-13
NZ190404A (en) 1983-02-15
AU522592B2 (en) 1982-06-17
BR7903280A (en) 1979-12-11
SE438545B (en) 1985-04-22
BE876501A (en) 1979-11-23
JPS54157333A (en) 1979-12-12
IT7923124A0 (en) 1979-05-30
NL7904222A (en) 1979-12-04
IL57334A0 (en) 1979-09-30
DE2920520C2 (en) 1988-10-27
CH632577A5 (en) 1982-10-15
ES481114A1 (en) 1980-08-16
AR218976A1 (en) 1980-07-15

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