4445 S. 74th E. Ave.
Tulsa, OK 74145
1415 FM 1960 East
Houston, TX 77073
12441 Business Highway 287N
Ft. Worth, TX 76179
5116 NW 3rd Street,
Oklahoma City, OK 73128
4390 Reynolds Dr.
Hilliard, OH 43026
3519 W. Beal City Road,
Weidman, MI 48893
19501 East 23rd Avenue
Aurora, CO 80011
2170 Ashley Phosphate Rd. - Suite 406
North Charleston, SC 29406
1264 Timberlane Road, Suite #1
Tallahassee, FL 32312
12521 Evergreen Dr., Suite A
Mukilteo, WA 98275
17902 Georgetown Lane
Huntington Beach, CA 92647
Edmonton, AB T5L 4L2
MESA offers a complete range of pipeline integrity services, with our engineering business unit structured
to provide the same high quality and service as that provided by our material supply and construction
service divisions. Our certified engineers and technicians are highly qualified, with many years of field
expertise. MESA’s integrity personnel will address and assist you in controlling the factors that contribute
to system failure, providing the following services:
External Corrosion Direct Assessment (ECDA) is an alternate Inspection methodology approved by DOT
49 CFR Part 192 and Part 195 to assess external corrosion in determining the integrity of a pipeline
system. The ECDA methodology is a four-step process requiring integration of pre-assessment data,
data from multiple indirect field inspections, and data from pipe surface examinations.
The Pre-Assessment step utilizes historic and recent data to determine whether ECDA is feasible, identify
appropriate indirect inspection survey tools, and define ECDA regions. The required data is typically available in
the corrosion survey records, alignment sheets and construction records, or other customer files
This step utilizes above-ground inspection techniques to identify and define the severity of coating faults,
diminished cathodic protection, and areas where corrosion may have occurred or may be occurring.
MESA performs the following over-the-line survey inspections:
A minimum of two of these survey tools are used over the entire pipeline segment to provide improved
detection reliability across the wide variety of conditions encountered along a pipeline right-of-way.
Quality submeter Global Positioning Satellites (GPS) are utilized to integrate the multiple streams of data
collected. Indications from indirect inspections are categorized according to severity. Our engineers are
knowledgeable in the application of ECDA tools in the many diverse field operating conditions to which
the pipeline may be subjected.
The Direct Examination step includes analyses of pre-assessment data and indirect inspection data to prioritize indications based on the likelihood and severity of external corrosion. This step includes excavation of prioritized sites for pipe surface evaluations resulting in validation or re-ranking of the prioritized indications. During the Direct Examination step, high priority areas with corrosion damage are re-evaluated for further action. The Direct Examination Step includes the following tasks:
The Post-Assessment step provides the summary and analysis of the data collected from the previous three steps to complete the Post
Assessment process requirements that include, but may not be limited to: