When is extra heavy steel pipe required on a boiler bottom blowdown line?

In the context of boiler systems, the requirement for using extra heavy steel pipe on a bottom blowdown line is closely related to the pressure conditions under which the system operates. Extra heavy steel pipe is designed to withstand higher pressures and is less prone to failure due to the stresses imposed by such conditions.

In this case, when the operating pressure is above 125 psi, the integrity of the blowdown piping becomes critical. This is because blowdown lines are subjected to high-pressure steam and water, particularly during the blowdown process, which is used to remove accumulated impurities and sediments from the boiler. At pressures exceeding 125 psi, regular pipe may not provide the necessary safety margins, potentially leading to leaks or bursts that could pose serious hazards.

Utilizing extra heavy steel pipe mitigates these risks by providing additional wall thickness and strength, ensuring that the system remains safe and functional under high-pressure operations. Understanding the pressure thresholds for different piping requirements is essential for maintaining safe steam operations and complying with regulatory standards in boiler design and maintenance.