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This issue of PPCHEM presents the second part of a detailed operational study, the first part of which was published in the last issue of this journal. The objective of this current paper is twofold: 1) to evaluate the effect of temperature, pressure, and iron levels on the formation of oxalate and phosphate (from phosphonates), and 2) to attempt to offer an explanation for the selective formation of oxalate and phosphate in the low-pressure saturated steam but not at other locations within the water/steam cycle, including the low-pressure superheated steam.

The second article focuses on foam cleaning of steam and gas turbines. The authors compare the different methods for scale removal with their advantages and disadvantages. As it is quite "new" in Europe, the foam cleaning method is described in more detail, including examples from the field.

The adsorption of OLDA from aqueous solution and wet steam has been thoroughly studied in the previous years. However, it is still disputed whether OLDA also adsorbs from dry steam, and thus would be able to protect the inner surfaces of the superheater and reheater sections. The third article presents a study carried out in a pilot boiler with a superheater in order to determine whether oleyl propylenediamine (OLDA) also adsorbs on metals from dry steam.

Last but not least, the highlights and key findings of ABHUG2025, of which the PPCHEM journal is a Media Partner, are presented.