Whilst strainers remove all visible particles in the steam, it is sometimes necessary to remove smaller particles, for example, in the following applications:
Example: In the food industry, and for the sterilisation of process equipment in the pharmaceutical industry.
Example: Sterilizers and paper/board machines.
Example: Humidifiers used in a ‘clean’ environment.
In such ‘clean steam’ applications, strainers are not suitable and filters must be used. A filter used in a steam system typically consists of a sintered stainless steel filter element. The sintering process produces a fine porous structure in the stainless steel, which removes any particles from fluid passing through it. Filters capable of removing particles as small as 1 μm are available, conforming to the good practice needs of culinary steam.