# MIDWESTERN GAS TRANSMISSION CO — Gas transmission and gathering — incident on 2012-05-01

- **operation:** document
- **citation:** PHMSA Report 20120053
- **title:** MIDWESTERN GAS TRANSMISSION CO — Gas transmission and gathering — incident on 2012-05-01
- **source type:** incident
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** historical
- **official:** true
- **published on:** 2012-05-22
- **effective on:** 2012-05-01
- **summary:** Gas transmission and gathering incident in WINSLOW, PIKE County, IN. Reported cause: MATERIAL FAILURE OF PIPE OR WELD. Reported consequences: 0 fatalities, 0 injuries, 5337 NATURAL GAS released, $12,000 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings. PHMSA trend classification: not significant, not serious.
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**body:**

Gas transmission and gathering incident in WINSLOW, PIKE County, IN. Reported cause: MATERIAL FAILURE OF PIPE OR WELD. Reported consequences: 0 fatalities, 0 injuries, 5337 NATURAL GAS released, $12,000 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings.

Report number: 20120053.

Operator ID: 12498.

Reported incident date: 5/1/2012 6:30.

Location detail: 2110+0.00

Cause detail: DESIGN-, CONSTRUCTION-, INSTALLATION-, OR FABRICATION-RELATED

Cause detail: 2" CROSS-OVER LINE FAILED AT GIRTH WELD CONNECTING 2" DIAMETER PIPE NIPPLE TO 2" WELD END VALVE WHICH WAS A BRANCH CONNECTION OFF THE 10" DIAMETER DISCHARGE HEADER. THE 2" CROSS-OVER LINE IS LOCATED ON THE SUCTION/DISCHARGE GAS TURBINE UNIT SKID PIPING. THE ACTUAL GAS TURBINE WAS REMOVED IN 2003. THE 2" CROSS-OVER LINE WAS USED TO PURGE AND LOAD THE COMPRESSOR YARD PIPING, BUT IS NOWBLINDED, CAPPED AND NO LONGER REQUIRED. ONEOK PARTNERS SUPPLIED THE FRACTURED PIPE SECTION TO SHERRY LABORATORIES FOR FAILURE ANALYSIS. BASED ON THE FAILURE ANALYSIS, IT APPEARS FAILURE WAS DUE TO A COMBINATION OF FATIGUE CRACKING AND WELDING DEFECTS IN THE FORMS OF LACK OF FUSION AND INTEGRITY OF THE WELD AND POROSITY IN THE WELD. THE STRESSES RESPONSIBLE FOR THE INITIATION AND PROPAGATION OF THE CRACK WERE A COMBINATION OF APPLIED SERVICE-RELATED CYCLIC LOADING AND RESIDUAL STRESSES FROM THE WELDING FABRICATION. NO MATERIAL DEFECTS IN THE TWO PARENT MATERIALS WERE ASSOCIATED WITH THE PIPE FAILURE.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: MATERIAL FAILURE OF PIPE OR WELD — CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED.

PHMSA indexed costs: $23,677 reported total cost, $16,071.806 in 1984 dollars, $27,538.445 in current-year dollars.

PHMSA trend flags, standardized causes, and indexed costs are analytical fields added to operator-reported incident data. They do not represent final agency causal findings.
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