What contributed to the East Harlem incident?

What contributed to the East Harlem incident?

• A. A gap in training that allowed an unqualified mechanic to perform fuse work.
• B. A failed regulator assembly during peak demand.
• C. A pipeline leak due to third-party damage.
• D. A valve stuck open during routine maintenance.

Answer: (B)

The event hinges on how gas pressure is controlled in the distribution system. Regulators are the devices that keep the downstream pressure steady as demand changes. If a regulator assembly fails during peak demand, the system can’t regulate pressure properly, allowing abnormal pressure and gas flow downstream. That excess gas can leak into streets or structures and create a high risk of ignition, which matches what was observed in the East Harlem incident. The other scenarios describe different failure modes or causes that don’t align with the regulator-related pressure issues that contributed to the incident.

The event hinges on how gas pressure is controlled in the distribution system. Regulators are the devices that keep the downstream pressure steady as demand changes. If a regulator assembly fails during peak demand, the system can’t regulate pressure properly, allowing abnormal pressure and gas flow downstream. That excess gas can leak into streets or structures and create a high risk of ignition, which matches what was observed in the East Harlem incident. The other scenarios describe different failure modes or causes that don’t align with the regulator-related pressure issues that contributed to the incident.