Cartridges & Mechanical Seals

88 Sector Water treatment In water treatment operations, different processes are carried out in order to obtain a product that complies with the stringent health and legal legislation of each country. During the different treatments to which water is subject, the me- chanical seals may come into contact with sediments, organic matter, dissolved substances such as calcium and magnesium (hard water), sulphate and carbon dioxide (acid water), manganese (sewage water), nitrates (water contaminated by fertilisers), etc. Although standard seals are often sufficient for most applications in this (supplying freshwater or transporting wastewater), in other cases the design of the mechanical seal and the materials must be carefully designed. Applications Requirements or critical conditions of the application Type of seal recommended Domestic water treatment → Bellows seal and conical spring seal. Desanding/degreasing treatment Decanting Fluids with a high particle content Even though water is the main element of the whole process and the main fluid used, the difficulties posed in sealing it are just as challenging as in other sectors. → Single cartridge seal, double cartridge seal, auxiliary elements (reservoirs cyclones) and wave spring seal. Deodorising → Bellows Seal (PTFE). Fluids containing chemicals: (sodium hypochlorite, sodium hydroxide, sulphuric acid)