Apparatus and methods for managing equipment stability

• US 7,819,024 B1
• Filed: 04/13/2009
• Issued: 10/26/2010
• Est. Priority Date: 04/13/2009
• Status: Expired due to Fees

• Current Assignee: Halliburton Energy Services Incorporated (Halliburton Company)
• Original Assignee: Halliburton Energy Services Incorporated (Halliburton Company)
• Inventors: Weightman, Glenn H., Crain, Steve, Lucas, Bruce C.
• Primary Examiner(s): THOMPSON, JEWEL VERGIE
• Application Number:
  US12/422,450
• Publication Number:
  US 20100257945A1
• Time in Patent Office: 561 Days
• Field of Search: 738/623.24, 73862041-862046, 738/626.28, 738/623.81, 738/654, 738/626.42, 702/42, 340/686.1
• US Class Current: 73/862.041
• CPC Class Codes: G01M 1/122 Determining position of centre of gravity

Abstract

Apparatus and methods for determining the instability of equipment by measuring the reaction forces at different points at the base of the equipment are disclosed. A plurality of load sensors are symmetrically arranged at the base of the equipment. A Cartesian coordinate system is then imposed on the base of the equipment with the center of the base being the origin of the Cartesian coordinate system. The X-axis and the Y-axis of the Cartesian coordinate system are arranged to define a plane corresponding to the base of the equipment. Each load sensor is then designated with Cartesian coordinates and the reaction force at each load sensor is determined. An overall instability factor for the equipment is then determined from the Cartesian coordinates of each load sensor and the reaction force at that load sensor.

Claims

1. A method of monitoring the instability of an equipment comprising:

symmetrically arranging a plurality of load sensors at a base of the equipment;

imposing a Cartesian coordinate system on the base of the equipment;

wherein center of the base is origin of the Cartesian coordinate system,

wherein the Cartesian coordinate system comprises an X-axis and a Y-axis, and

wherein the X-axis and the Y-axis define a plane corresponding to the base of the equipment;

designating Cartesian coordinates to each load sensor;

determining a reaction force at each load sensor; and

determining an overall instability factor for the equipment from the Cartesian coordinates of each load sensor and the reaction force at that load sensor.

2. The method of claim 1, wherein the step of determining an overall instability factor for the equipment using the Cartesian coordinates of each load sensor and the reaction force at that load sensor comprises:

determining a first instability factor in the direction of the X-axis;

determining a second instability factor in the direction of the Y-axis; and

determining the overall instability factor using the first instability factor and the second instability factor.

3. The method of claim 2, wherein determining the first instability factor comprises:

multiplying the reaction force at each load sensor by Cartesian coordinate of the load sensor on the X-axis to obtain a first relative reaction force at the load sensor;

obtaining a sum of the first relative reaction forces at the load sensors; and

dividing the sum of the first relative reaction forces at the load sensors by a sum of the reaction forces at the load sensors.

4. The method of claim 2, wherein determining the second instability factor comprises:

multiplying the reaction force at each load sensor by Cartesian coordinate of the load sensor on the Y-axis to obtain a second relative reaction force at the load sensor;

obtaining a sum of the second relative reaction forces at the load sensors; and

dividing the sum of the second relative reaction forces at the load sensors by a sum of the reaction forces at the load sensors.

5. The method of claim 2, wherein for a rectangular base, the step of determining the overall instability factor using the first instability factor and the second instability factor comprises:

determining an absolute value of the first instability factor;

determining an absolute value of the second instability factor; and

designating the greater of the absolute value of the first instability factor and the absolute value of the second instability factor as the overall instability factor.

6. The method of claim 2, wherein for a circular base, the step of determining the overall instability factor using the first instability factor and the second instability factor comprises determining the square root of the sum of the first instability factor squared and the second instability factor squared.

7. The method of claim 1, wherein the load sensor is selected from the group consisting of an electronic load cell, a hydraulic load cell, a scale, a load pin, a dual sheer beam load cell, a strain gauge, a pressure transducer and combinations thereof.

8. The method of claim 1, further comprising:

designating a threshold overall instability factor; and

providing an alert if the overall instability factor exceeds the threshold overall instability factor.

9. The method of claim 8, wherein the step of providing an alert if the overall instability factor exceeds the threshold overall instability factor comprises sounding an alarm.

10. The method of claim 8, wherein the step of providing an alert if the overall instability factor exceeds the threshold overall instability factor comprises transmitting a signal to a user at a remote location.

11. The method of claim 10, wherein the step of transmitting a signal to a user at a remote location comprises transmitting the signal over a wireless network.

12. The method of claim 1, wherein the equipment is a storage tank.

13. A system for monitoring instability of an equipment comprising:

a plurality of load sensors symmetrically arranged on a base of the equipment;

an information handling system coupled to the plurality of load sensors,

wherein the information handling system determines an overall instability factor for the equipment, and

wherein the overall instability factor is determined based on reaction forces at the plurality of load sensors.

14. The system of claim 13, wherein the equipment comprises a storage tank.

15. The system of claim 13, wherein the load sensor is selected from the group consisting of an electronic load cell, a hydraulic load cell, a scale, a load pin, a dual sheer beam load cell, a strain gauge, a pressure transducer and combinations thereof.

16. The system of claim 13, further comprising a notification mechanism, wherein the notification mechanism provides an alert if the overall instability factor exceeds a preset threshold overall instability factor.

17. The system of claim 16, wherein the notification mechanism comprises an alarm.

18. The system of claim 17, further comprising a network for transmitting the alarm to a user at a remote location.

19. The method of claim 18, wherein the network comprises a wireless network.

20. The method of claim 18, wherein the network comprises a wired network.