Digester Tank

Astro Pak was hired to pickle and passivate two 70′ tall x 96′ diameter stainless steel digester tanks at a wastewater treatment facility. The original request was to only pickle and passivate the welds, but to prevent streaking along the tank walls we recommended pickling and passivating the entire interior surface.


This job was performed by a crew of five technicians who mobilized out of Astro Pak’s Southern California location.


Pickling etches metal so process control is essential as corrosion and pitting can occur if chemical concentration and/or contact time is not monitored.


Astro Pak also provides descaling, pigging, sanitization, chlorination services, along with precision cleaning of LOX, GOX, and ozone systems.