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51313-02525-Microbiologically Influenced Corrosion—Riviera Park Case Study

Picture for Microbiologically Influenced Corrosion—Riviera Park Case Study
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Product Number: 51313-02525-SG
ISBN: 02525 2013 CP
Author: William Brooks
Publication Date: 2013
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MIC – Riviera Park Case Study
Riviera Park is a small housing development north of Amarillo Texas. Until a few years ago the City of Amarillo was served natural gas from a large gas field north of town. The system that connects the gas field to Amarillo is called the Fain System. The 16 inch line that is part of the Fain System running through this subdivision is referred to as the Riviera Park line. In 2009 microbiologically induced corrosion also known as MIC was discovered on the Riviera Park line.

As part of a Pipeline Integrity Management (PIM) assessment of the line we were performing an Internal Corrosion Direct Assessment (ICDA) dig to determine if internal corrosion was present due to this location being identified as a critical angle. A critical angle is an area that could be possible water hold up region. The pipe was suspended above the creek and MIC was discovered on the external surface of the east leg of the crossing.

Finding MIC in this particular area was highly unexpected. The dry soil and moderately high soil resistivity in the Texas Panhandle typically are not conducive the growth of corrosive bacteria. The line was installed in 1946 and was coated with coal tar. The pipeline is cathodically protected using the 100mV criteria. In 2009 the close interval survey (CIS) indicated that the line was not adequately protected at this location to meet the requirements of this criterion. We now know that the current was being shielded by the MIC.

The dig results determined wet sandy soil with a slightly acidic ph of 5.5. It is likely that the deterioration and disbonding of the pipeline coating contributed to circumstances that allowed bacterial growth. Large areas of corrosion features were discovered at the 3:00 to 9:00 location for 40 feet along the line. MIC analysis using quick test kits confirmed that both anaerobic and acid producing bacteria were present in the pits.

Due to the bacterial damage 65 feet of the pipe was replaced. A new deepwell was installed to insure that the system is in compliance with the criteria and that the pipe is adequately protected. Subsequently the pipe has been uncovered while installing a valve and shows no evidence of corrosion as of May 2012.
 

MIC – Riviera Park Case Study
Riviera Park is a small housing development north of Amarillo Texas. Until a few years ago the City of Amarillo was served natural gas from a large gas field north of town. The system that connects the gas field to Amarillo is called the Fain System. The 16 inch line that is part of the Fain System running through this subdivision is referred to as the Riviera Park line. In 2009 microbiologically induced corrosion also known as MIC was discovered on the Riviera Park line.

As part of a Pipeline Integrity Management (PIM) assessment of the line we were performing an Internal Corrosion Direct Assessment (ICDA) dig to determine if internal corrosion was present due to this location being identified as a critical angle. A critical angle is an area that could be possible water hold up region. The pipe was suspended above the creek and MIC was discovered on the external surface of the east leg of the crossing.

Finding MIC in this particular area was highly unexpected. The dry soil and moderately high soil resistivity in the Texas Panhandle typically are not conducive the growth of corrosive bacteria. The line was installed in 1946 and was coated with coal tar. The pipeline is cathodically protected using the 100mV criteria. In 2009 the close interval survey (CIS) indicated that the line was not adequately protected at this location to meet the requirements of this criterion. We now know that the current was being shielded by the MIC.

The dig results determined wet sandy soil with a slightly acidic ph of 5.5. It is likely that the deterioration and disbonding of the pipeline coating contributed to circumstances that allowed bacterial growth. Large areas of corrosion features were discovered at the 3:00 to 9:00 location for 40 feet along the line. MIC analysis using quick test kits confirmed that both anaerobic and acid producing bacteria were present in the pits.

Due to the bacterial damage 65 feet of the pipe was replaced. A new deepwell was installed to insure that the system is in compliance with the criteria and that the pipe is adequately protected. Subsequently the pipe has been uncovered while installing a valve and shows no evidence of corrosion as of May 2012.
 

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