Nitrites are often used in closed recirculating cooling systems for cooling of gas engines and compressors
High levels of nitrite also add to the dissolved solids content of the water. Water that makes it past the mechanical seal on a pump will evaporate and leave the dissolved solids behind. These accumulated dissolved solids can eventually abrade the mechanical seal away.
Nitrite is an anodic corrosion inhibitor for mild steel, cast iron, galvanized steel, aluminum, and tin
Therefore in the Nitrite industry as well as in the industry for Closed hot and chilled water loops and glycol systems, you need to use pumps that can handle high amounts of nitrite