What pressure range is sodium nitrate used for inhibiting embrittlement in boilers?

Sodium nitrate is used in boiler systems to help inhibit embrittlement, which can occur when high temperatures and pressures negatively affect boiler materials over time. The correct pressure range for sodium nitrate usage is up to 6700 kPa because this range encompasses typical operating pressures in many industrial and utility boilers where sodium nitrate can effectively function as a stabilizing agent.

At pressures above 6700 kPa, the effectiveness of sodium nitrate can diminish due to changes in the chemical behavior and interactions that may occur at these higher pressures, potentially reducing its protective qualities against embrittlement. Thus, using sodium nitrate in this specified pressure range allows for optimal corrosion control and material integrity, ensuring safe and efficient boiler operation.