METHODS AND SYSTEMS FOR AUTOMATED PIPELINE TESTING

• US 20070035315A1
• Filed: 05/26/2006
• Published: 02/15/2007
• Est. Priority Date: 06/22/2001
• Status: Active Grant

• Current Assignee: Elecsys International Corporation (Lindsay Corporation)
• Original Assignee: NTG Inc.
• Inventors: Hilleary, Thomas
• Granted Patent: US 7,317,321 B2
• Time in Patent Office: Days
• US Class Current: 324/700
• CPC Class Codes: C23F 13/22 Monitoring arrangements therefor
• CPC Class Codes: G01N 17/02 Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement

Abstract

A method for testing effectiveness of a cathodic protection device configured to apply at least one voltage across an underground structure and a reference point is described. The method includes providing a sample of the material from which the underground structure is fabricated, placing the sample proximate the underground structure, electrically connecting the sample to the underground structure through a switch, operating the switch at predetermined intervals, and measuring electrical characteristics of the sample at intervals based at least partially on the predetermined intervals and a position of the switch

Claims

1. A method for testing effectiveness of a cathodic protection device configured to apply at least one voltage across an underground structure and a reference point, said method comprising:

providing a sample of the material from which the underground structure is fabricated;

placing the sample underground, proximate the underground structure;

electrically connecting the sample to the underground structure through a switch;

operating the switch at predetermined intervals; and

measuring electrical characteristics of the sample at intervals based at least partially on the predetermined intervals and a position of the switch.

2. A method according to claim 1 wherein measuring electrical characteristics of the sample comprises at least one of measuring a voltage at the sample with the switch closed and the voltage applied to the underground structure, measuring the voltage at the sample a predetermined time after the switch has been opened, and making periodic voltage measurements after the switch has been opened to determine a decay rate of the voltage potential at the sample.

3. A method according to claim 1 wherein the switch is a component of a test point monitor, the monitor including a processor and a cellular modem, the cellular modem and the switch interfaced to the processor, and wherein operating the switch at predetermined intervals comprises:

configuring the processor to operate the switch at predetermined intervals; and

receiving instructions to operate the switch via the cellular modem.

4. A method according to claim 1 further comprising transmitting the measured electrical characteristics of the sample over at least one of a cellular control channel, a short messaging service cellular channel, and a general packet radio service.

5. A method according to claim 1 further comprising:

transmitting, to a remote site, the measured electrical characteristics utilizing at least one of a cellular control channel, a short messaging service cellular channel, and a general packet radio service;

receiving, at the remote site, the transmitted, measured electrical characteristics; and

reconstructing a depolarization curve using the received electrical characteristic measurements.

6. A method according to claim 1 wherein measuring electrical characteristics of the sample comprises:

averaging a number of voltage measurements taken at the sample with the switch closed and the voltage applied to the underground structure, and averaging a number of voltage measurements taken at the sample after the switch has been opened; and

transmitting the averaged measurement over at least one of a cellular control channel, a short messaging service cellular channel, and a general packet radio service.

7. A system for testing operation of cathodic protection equipment, the equipment configured to apply at least one voltage across an underground structure and a reference point, said system comprising:

a sample of a material from which the underground structure is fabricated, said sample configured for underground placement proximate the underground structure;

a switch configured to electrically connect said sample to the underground structure when closed; and

a measurement device configured to control operation of said switch, measure electrical characteristics at said sample with respect to the reference point, and transmit the measurements to an external device.

8. A system according to claim 7 wherein said switch comprises a relay located within said measurement device.

9. A system according to claim 7 wherein said measurement device comprises a monitor configured to periodically measure voltage at said sample, said monitor comprising a processor and a cellular modem interfaced to said processor, said monitor further configured to transmit measured voltages over at least one of a cellular control channel, a short messaging service cellular channel, and a general packet radio service.

10. A system according to claim 7 wherein said measurement device is configurable to measure a potential at said sample with said switch closed, and measure a potential at said switch at predetermined times after said switch is opened.

11. A system according to claim 7 wherein said measurement device is configured to average a plurality of electrical characteristic measurements before transmission to the external device.

12. A system according to claim 7 wherein said measurement device comprises:

a processor;

a cellular modem interfaced to said processor; and

at least one analog sensor electrically connected to said sample and interfaced to said processor, said monitor configured with a wake-up cycle, and during the wake up cycle, said monitor configured to measure a voltage at said sample with said switch closed using said at least one analog sensor, cause said switch to be opened, and measure at least one voltage at said sample utilizing said sensor with said switch opened, said monitor further configured to transmit the measured voltages utilizing said modem.

13. A system according to claim 12 wherein said monitor is configured to perform multiple voltage measurements at said sample utilizing said sensor with said switch opened to characterize a gradual voltage decay at said sample.

14. A method for monitoring corrosion of a cathodically protected underground structure using a sample of the material from which the underground structure is fabricated, said method comprising:

locating the sample underground in proximity to the underground structure;

providing a programmable switch within an electrical connection between the underground structure and the sample;

periodically measuring the voltage at the sample both with the switch closed and with the switch open; and

transmitting the measurements to a site remote from the monitor.

15. A method according to claim 14 further comprising:

receiving, at the remote site, the transmitted measurements; and

determining, using the transmitted voltage measurement, whether the cathodic protection equipment is operational.

16. A method according to claim 14 wherein periodically measuring the voltage at the sample comprises:

configuring a monitor electrically connected to the sample with at least one wake-up cycle; and

configuring the monitor to make measure voltages at the sample and operate the programmable switch during the wake-up cycle.