Boiler blow-down tanks are classified as what type of piping?

Boiler blow-down tanks are classified as non-boiler external piping because they are not part of the boiler itself but rather connected externally to facilitate the removal of impurities from the boiler water. The primary purpose of a blow-down tank is to safely contain and manage the wastewater produced from the blow-down process, which helps maintain water quality in the boiler system.

This classification reflects that the blow-down tank and its related piping do not operate under the same pressure and temperature conditions as those within the boiler. Consequently, the regulations and design requirements for non-boiler external piping differ from those applied to internal components of a boiler system or high-pressure and low-pressure piping classifications.