|
|
Coastal Corrosion Survey
Services
Computerized Close Interval Potential Survey
Coastal Corrosion Control Survey offers computerized potential surveys. This survey is based on the equipment and procedures described below:
 Equipment
Coastal Corrosion Control Survey has developed an advanced set of data collection equipment offering features previously unavailable in the industry. One of the highlights of this system is the synchronization of both the interrupters and the field computer to the WWV short wave time broadcast, eliminating the need to synchronize interrupters on a daily basis. Another highlight is the ability to read and record induced AC on the pipeline at the same time the pipe to soil potentials are measured. Please refer to the following specifications for pertinent details.
Field Computer
- PSION organizer Model LZ64
- AC: o to 500 Volts, +/-.01 Volt
- DC: -500 to +500 Volts, +/-0.01 Volt
- DC: 0 to 2.5 Volts, +/-0.0001 Volt
- Storage: up to 2 Meg of Removable Ram or EPROM on Board
- Synchronized to +/-22 Milliseconds of GPS Time Broadcast
- Test Station Readings Measured Simultaneously
- AC and DC Pipe to Soil Potentials measured Simultaneously
Rectifier Interrupters
- F68HC11 Microprocessor Based System
- AC Operating Range: 0 to 90 Amps, 0 to 100 VDC +80 VAC
- DC Operating Range: 0 to 100 Amps, 0 to 100 VDC
- Synchronized to +/-3 Milliseconds of GPS Time Broadcast
- Records Rectifier Output Once a Minute for 14 days on EPROM
- Operates on Battery, 110 VAC or 240 VC
- Programmable: Startup / Shutdown
- Interruption cycle: Variable 100 Milliseconds to 1 year
Survey Procedures
The typical survey includes all labor, materials, and transportation necessary to locate the pipe, collect the potential data, and produce the final report. The pipe is located with a radio frequency pipe locator in either the inductive or conductive mode. The pipeline is chained with a surveyor's tape or write counter and flagged at 100-foot intervals, as it is located. The pipe to soil potential (AC or DC) are measured and recorded on a PSION Organizer, and the data is plotted on a daily basis in the field to insure the accuracy of the survey.
Coastal Corrosion Control Survey uses custom rectifier interrupters which are synchronized to cycle. The cycle is then updated every 3 seconds by GPS Equipment. The data collected is identified as on or off by comparison to the field computer's internal clock which is synchronized with the GPS time transmissions. All potentials are recorded with an individual offset from the last known client alignment station. Each reading is triggered in by the computer operator. No automatic data collection is attempted.
Coastal Corrosion Control Survey typically uses a three men survey crew, with two vehicles. All wire and flagging will be removed from the right-of-way immediately after surveying.
The collected data is transmitted to our Baton Rouge, LA office on a daily basis for processing into final plots. The final plots are available in color or black and white and on either 8 ½" x 11" or 11" x 17" paper.
Our production rates are typically between 4 to 6 miles per day, and the final report is usually submitted within 3 weeks of completing the field work.
We thank you for your interest in this service and request that you contact us at your convenience if we can furnish additional information. |
| |
|
