Methods and systems for automated pipeline testing

• US 20040232924A1
• Filed: 06/22/2004
• Published: 11/25/2004
• Est. Priority Date: 06/22/2001
• Status: Active Grant

• Current Assignee: Elecsys International Corporation (Lindsay Corporation)
• Original Assignee: NTG Inc.
• Inventors: Hilleary, Thomas N., Peden, Perry B. Jr.
• Granted Patent: US 7,068,052 B2
• Time in Patent Office: Days
• US Class Current: 324/700
• CPC Class Codes: C23F 13/22 Monitoring arrangements therefor
• CPC Class Codes: C23F 2213/32 Pipes
• CPC Class Codes: F16L 58/00 Protection of pipes or pipe fittings against corrosion or incrustation compound tubes F16L9/14
• CPC Class Codes: G01N 17/02 Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement

Abstract

A method for testing a cathodic protection system is disclosed where the system includes a cathodic protection rectifier configured to apply a voltage across a pipeline and a reference point. The method includes measuring a magnitude of an output voltage of the cathodic protection rectifier, transmitting to a site remote from the rectifier, the measured output voltage magnitude using a cellular control channel, receiving the transmitted measurement at the remote site, and using the transmitted measurement to determine whether the cathodic protection system is operational.

Claims

1. A method for testing operation of a cathodic protection rectifier (CPR) electrically coupled to a pipeline and a reference point, the CPR configured to apply a voltage to the pipeline, a cathodic system monitor which includes a cellular modem and is configured to communicate with an external system and further configured to control and verify application of the voltage to the pipeline, said method comprising:

applying the CPR voltage to the pipeline through a shunt resistor;

measuring the voltage across the shunt resistor with the cathodic system monitor;

operating the cathodic system monitor to calculate a current applied to the pipeline by the CPR;

transmitting the current calculations to the external system; and

analyzing the current calculations utilizing the external system.

2. A method according to claim 1 wherein applying the CPR voltage to the pipeline through a shunt resistor comprises periodically cycling the applied voltage and operating the cathodic system monitor to calculate a current comprises verifying that the applied voltage is cycling.

3. A method according to claim 2 wherein said cycling the applied voltage comprises a portion of a synchronized interruption test.

4. A system for monitoring a critical bond electrically connecting separate underground structures, the underground structures each including corrosion mitigation equipment applying a voltage to the respective structure, said system comprising:

a shunt resistor electrically connected between the separate structures; and

a monitor configured to periodically measure the voltage across the shunt resistor, said monitor comprising a processor and a cellular modem interfaced to said processor, said monitor further configured to transmit the measured voltages over at least one of a cellular control channel, a short messaging service cellular channel, and a general packet radio service.

5. A method for monitoring a critical bond between separate underground structures, the underground structures each including corrosion mitigation equipment applying a voltage to the respective structure, said method comprising:

electrically connecting a shunt resistor between the separate structures;

periodically measuring the voltage across the shunt resistor utilizing a monitor, the monitor configured to transmit the measured voltages over at least one of a cellular control channel, a short messaging service cellular channel, and a general packet radio service.

6. A method for monitoring operation of corrosion mitigation equipment applying an electrical voltage to a well casing, said method comprising:

periodically measuring the voltage applied to the well casing with a monitor;

transmitting, to a site remote from the monitor, the measured voltage 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 voltage measurement; and

determining, using the transmitted voltage measurement, whether the corrosion mitigation equipment is operational.

7. A test point monitor configured to monitor operation of corrosion mitigation devices for underground structures and structures having ground contact, said monitor comprising:

a processor;

a cellular modem interfaced to said processor; and

at least one analog sensor interfaced to said processor, said monitor configured with a wake-up cycle, and during the wake up cycle, said monitor configured to cause a connection to be made to a testing point for the corrosion mitigation device and configured to measure at least one voltage utilizing said sensor, said monitor further configured to transmit the at least one measured voltage utilizing said modem.

8. A test point monitor according to claim 7 wherein during said wake-up cycle, said monitor is configured to receive communications initiating a measurement or series of measurements to be taken utilizing said sensor.

9. A test point monitor according to claim 8 wherein the series of measurements are measurements taken after one or more voltages have been removed from the structure by the corrosion mitigation device, said test point monitor configured with a programmable delay, the measurements made after the programmable delay.

10. A test point monitor according to claim 7 comprising a plurality of analog sensors, wherein a portion of said analog sensors are electrically connected to measure a pipe-to-soil potential at a close interval survey test point with respect to a reference point for an underground pipeline.

11. A method for adjusting an output of a cathodic protection rectifier, the cathodic protection rectifier connected to a power source and configured to apply a voltage across the pipeline and a reference point in the soil, a cathodic system monitor coupled to the rectifier and further configured to control application of the voltage to the pipeline, the cathodic system monitor configured to communicate with an external computer system, said method comprising:

receiving at the monitor, a communication from the external system to adjust an output of the rectifier;

operating the monitor to adjust the output of the rectifier;

operating the monitor to measure the adjusted output of the rectifier; and

transmitting the measured output to the external computer system.

12. A method according to claim 11 wherein the cathodic system monitor includes an output control circuit, a full scale output of the output control circuit correlated to a maximum voltage output of the rectifier.

13. A method according to claim 12 wherein said receiving at the monitor comprises receiving an instruction to set the output control circuit output to a specific value and said operating the monitor to adjust the output of the rectifier comprises setting the output control circuit output to the received specific value.

14. A method according to claim 11 wherein operating the monitor to measure the adjusted output of the rectifier comprises:

measuring the voltage output by the rectifier; and

measuring the current supplied by the rectifier.

15. A method according to claim 11 wherein an output of the rectifier is connected to the pipeline through a shunt resistor, wherein measuring the current supplied by the rectifier comprises:

operating the monitor to measure the voltage across the shunt resistor; and

determining the current supplied based on the voltage across the shunt resistor.

16. A method according to claim 11 wherein said receiving at the monitor and said transmitting comprise communicating utilizing at least one of a cellular control channel, a short messaging service cellular channel, and a general packet radio service.

17. A cathodic protection rectifier system for an underground pipeline, the pipeline configured with a plurality of test points along a length of the pipeline, each electrically connected to the pipeline, said system comprising:

at least one cathodic rectifier coupled to a power source and configured to apply a voltage across the pipeline and a reference point in the soil;

a cathodic system monitor coupled to said rectifier, said monitor configured to control the voltage said rectifier applies to the pipeline, said monitor further configured to measure voltages and currents applied to the pipeline and to communicate the voltage and current measurements as pipeline test data; and

a computer system configured to receive the pipeline test data from said cathodic system monitor.

18. A cathodic protection rectifier system according to claim 17 wherein said monitor is configured to control the voltage said rectifier applies to the pipeline based on a communication received from said computer system.

19. A cathodic protection rectifier system according to claim 18 wherein said monitor comprises an output control circuit and the communication received from said computer system is configured to set an output of said output control circuit, the voltage applied by said rectifier to the pipeline scaled to the output of said output control circuit.

20. A cathodic protection rectifier system according to claim 19 wherein said output control circuit comprises an analog-to-digital converter.

21. A cathodic protection rectifier system according to claim 17 wherein said monitor is configured to control a switch located between said rectifier and the pipeline.

22. A cathodic protection rectifier system according to claim 17 wherein said monitor and said computer system are configured to communicate utilizing at least one of cellular control channel communications, short messaging service cellular communications, and a general packet radio service.

23. A cathodic protection rectifier system according to claim 17 wherein said computer system is configured to:

access one or more of high resolution satellite data and aerial photographic data; and

display the accessed data overlaid with pipeline test data.

24. A cathodic protection rectifier system according to claim 23 wherein said computer system is configured to:

request updated data relating to one or more of satellite data and aerial photographic data upon receipt of pipeline test data; and

display potential consequences relating to the pipeline based on the received pipeline test data and the requested, updated data.

25. A test point monitor comprising:

a processor;

a cellular modem interfaced to said processor; and

at least one sensor interfaced to said processor, said monitor configured to cause a connection to be made to a testing point to monitor operation of corrosion mitigation equipment for one or more of well casings, critical bonds between two or more underground structures, and underground pipelines, said monitor further configured to transmit data relating to the operation of the corrosion mitigation equipment utilizing said modem.