material usedReading time:
Table 1 provides an overview of commonly used materials for storing liquid reagents. In particular, the following points need to be noted:
- plastics (PVC and polyethylene in particular) are routinely used for corrosive liquid storage;
- reinforced polyester is eminently suitable for silos used to store lime or other powdered products because of its total stability and also its smooth properties that promote product flow.
- on grounds of its price and mechanical properties, carbon steel is used for large capacity tanks containing:
- sodium hydroxide at less than 47% and below 50°C;
- concentrated sulphuric acid (at least 92%) providing there is absolutely no trace of humidity (vent must be protected by a desiccant);
- the use of steel (even stainless steel) is prohibited if in contact with normal chlorinated reagents (ferric chloride, hypochlorites, hydrochloric acid and chlorine gas in the presence of humidity).