Steam trap monitoring

• US 8,935,126 B2
• Filed: 12/23/2009
• Issued: 01/13/2015
• Est. Priority Date: 12/08/2004
• Status: Active Grant

• Current Assignee: Armstrong International Incorporated
• Original Assignee: Armstrong International Incorporated
• Inventors: Armstrong, David M., Cheskaty, Rex, Horton, William R., Gaines, Michael H., Hellman, Michael P., Grubka, Lawrence J.
• Primary Examiner(s): Teixeira Moffat, Jonathan C
• Assistant Examiner(s): BETSCH, REGIS J
• Application Number:
  US12/646,283
• Publication Number:
  US 20100153068A1
• Time in Patent Office: 1,847 Days
• Field of Search: 702/183, 702/188, 137/179
• US Class Current: 702/188
• CPC Class Codes: F16T 1/48 Monitoring arrangements for inspecting, e.g. flow of steam and steam condensate
• CPC Class Codes: Y10T 137/3028 With non-discriminating gas vent or liquid discharge
• CPC Class Codes: Y10T 137/8158 With indicator, register, recorder, alarm or inspection means

Abstract

An apparatus and method for monitoring the status of a steam trap include a device for sensing a process condition of the steam trap and a device for processing the sensed condition. The apparatus can include a processor positioned on a steam trap. The connection of the monitoring device to the steam trap can be to the trap itself or to an adjacent pipe or other apparatus.

Claims

1. A method of monitoring the status of a steam trap comprising:

sensing a process condition of at least one of a temperature condition, an acoustical condition, or a pressure condition of the steam trap by taking multiple readings of one or more stream trap parameters, the process condition representing a continuum of values between an uppermost process condition limit and a lowermost process condition limit;

selecting a threshold level for the sensed process condition, the threshold level having a adjustable value between the upper process condition limit and the lower process condition limit;

processing the multiple readings using an algorithm in a processor mounted in a steam trap monitor positioned in the vicinity of the steam trap, wherein the processing includes;

a) determining if the sensed process condition exceeds the threshold level;

b) continuing to sense the process condition for a pre-determined number of readings after determining that the threshold level has been exceeded by the sensed process condition; and

c) comparing the sensed process condition from each of the pre-determined number of readings to the threshold level; and

d) returning to the step of sensing the process condition of the steam trap when the sensed process condition again falls below the threshold level before the predetermined number of readings are completed; and

transmitting a signal, based upon the processed multiple readings, indicative of determining one of a transient or steady state status of the process condition of the one or more steam trap parameters.

2. The method of claim 1, in which signals that are indicative that the process condition is within a programmed limit are transmitted at predetermined intervals, and in which signals that are indicative that the process condition is outside the programmed limit are transmitted immediately upon detection.

3. The method of claim 1 in which the algorithm includes determining whether or not a predetermined percentage of the readings for a parameter have values that exceed a threshold level for the sensed condition.

4. The method of claim 1, wherein when the threshold level is exceeded for each of the pre-determined number of readings, a signal is generated.

5. A method of a monitoring the operational characteristics of a steam trap comprising:

connecting a monitoring device to a specific steam trap unit;

programming the monitoring device to learn the individual operational characteristics of the specific steam trap unit;

operating the steam trap unit during an initial set up period;

sensing a process condition that is representative of the operational characteristics of the specific steam trap unit during the initial set up procedure by taking multiple readings of one or more stream trap parameters, the process condition being at least one of a temperature condition, an acoustical condition, or a pressure condition, the process condition representing a continuum of values between an uppermost process condition limit and a lowermost process condition limit;

determining an upper tolerance level and a lower tolerance level of the sensed process condition for the specific steam trap unit, the upper and lower tolerance levels being selectable values between the uppermost process condition limit and the lowermost process condition limit;

initiating a query to determine whether the process condition is one of a transient status or a steady state status process condition of the steam trap and sensing the process condition of the specific steam trap unit during operation after the initial set up period;

comparing the sensed process condition of the specific steam trap unit after the initial set up period with the upper and lower tolerance levels; and

generating a signal when the sensed process condition is outside of the upper and lower tolerance levels.

6. The method of claim 5 wherein the query is conducted on a regular basis during operation after the initial set up period.

7. The method of claim 6 wherein the regular basis of conducting queries is a predetermined schedule that is included in the programming of the monitoring device.

8. The method of claim 7 wherein a step of initiating a new query according to the predetermined schedule is taken by the monitoring device if the sensed process condition is within the upper and lower tolerance level.

9. The method of claim 5 wherein the step of comparing the sensed process condition includes determining if the sensed process condition is within the upper and lower tolerance level.

10. The method of claim 9 wherein sensing the process condition includes taking multiple readings of the process condition.

11. The method of claim 5 wherein the sensed process condition is a temperature measurement and the method includes a step of determining if the steam trap is connected to a connector block that is located on an active steam line based on the temperature measurement.

12. The method of claim 5 wherein the step of connecting a monitoring device to a specific steam trap unit includes connecting the monitoring device to a radio frequency transmitter.

13. The method of claim 12 wherein the step of comparing the sensed process condition of the specific steam trap unit after the initial set up period with the upper and lower tolerance level includes transmitting a signal, based upon the processed multiple readings, indicative of the process condition of the one or more steam trap parameters.

14. The method of claim 13 wherein the step of transmitting a signal further includes the transmitter periodically transmitting the signal indicative of the process condition to the receiver when the sensed process condition is within programmed limits and transmitting the signal to the receiver immediately upon detection of a condition outside the programmed limits.

15. The method of claim 14 wherein the receiver is connected to a base computer, and the base computer is Internet accessible.