Are the wash water and washing solutions used in phosphatic ammonium plants considered pressure pipelines?
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Especially washing water – it shouldn’t be considered a toxic liquid, right?
It depends on temperature, pressure, the medium, as well as the pipe diameter; it’s not necessarily the case
This post was last edited by Prescind on 2017-3-3 at 13:13. Operating temperature: 80°C; operating pressure: 0.6 Mpa; pipe diameter: DN50~300; medium: the washing solution is an aqueous solution of ammoniated phosphoric acid with 40~48% P2O5, N/P ratio of 0.05~0.5, and a solid content of 10%； Maximum 5% sulfuric acid ； Trace amounts of Cl‑, F‑. The washing water is process water containing trace amounts of sulfuric acid and DAP.
Pressure pipelines refer to tubular devices that use a certain pressure to transport gases or liquids. They are defined as pipelines with a maximum operating pressure of 0.1 MPa (gauge pressure) or more, carrying gases, liquefied gases, steam, or liquids that are flammable, explosive, toxic, corrosive, and have a maximum operating temperature equal to or higher than their standard boiling point, and with a nominal diameter of 50 mm or more. Except for pipes with a nominal diameter of less than 150 mm and a maximum operating pressure of less than 1.6 MPa (gauge pressure), as well as the pipes that form part of the equipment used for transporting non-toxic, non-flammable, and non-corrosive gases. Among them, the safety supervision and management of oil and gas pipelines shall also be carried out in accordance with laws and regulations such as the Work Safety Law and the Oil and Gas Pipeline Protection Law. It depends on whether the medium is flammable, explosive, toxic, or corrosive
Medium: The washing solution is an aqueous solution of ammoniated phosphoric acid: 40–48% P2O5, N/P = 0.05–0.5, with a solid content of 10%； Maximum 5% sulfuric acid ； Trace amounts of Cl‑, F‑. The washing water is process water containing trace amounts of sulfuric acid and DAP.