Entergy New Orleans, Inc.
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Natural Gas System Rebuild
Why Rebuild?
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Natural Gas System Rebuild

Why are we Rebuilding the Gas System?

Hurricane Damages Drive Rebuild

  • Widespread flooding after Hurricane Katrina in 2005 inundated Entergy New Orleans’ gas system with corrosive saltwater. After the flooding, more than four million gallons of saltwater was drained from the system.

  • Over time the corrosive effects of the saltwater would degrade the system’s piping and cause service problems and interruptions. In 2006, about 2 percent of Entergy New Orleans’ gas customers experienced reliability issues related to a small amount of water remaining in the system.

  • The condition-based approach comes as the company recognizes that over time flood-induced corrosion could impact various areas of the gas system differently and that the repopulation of the city could require the company to possibly change target areas.

Less Vulnerable to Flood Damage

  • The high pressure system being installed has pressure up to 99 pounds and would require more than 215 feet of water on top of a break to infiltrate the system.

  • If the high-pressure system experiences a Hurricane Katrina-type inundation, it would take less time to dewater the system instead of months and would reduce reliability problems caused by residual amounts of water in the system.

  • The new high-pressure system will be rebuilt with industry-standard, high-density polyethylene gas pipe which is virtually impervious to saltwater corrosion compared to cast iron or steel traditionally used for gas systems.

Reliability and Safety Benefits

  • The new system configuration introduces additional redundancies to ensure reliable delivery of gas to customers, thereby reducing the scope of outages.

  • Disruptions to the flow of gas can be isolated and confined more easily, keeping the flow of gas available to more customers in an affected area.

  • In the event of a leak, repairs are performed quicker than a steel/cast iron system that requires welding and cathodic protection performed under the street.

  • A new safety feature is the “excess valve” included in each customer service line. This new feature will automatically shut off gas flow if the customer’s service develops a leak or some other disruption.