Detection and alarm for acid water pumps

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Acidic water pumps are connected to equipment at atmospheric pressure; the liquid phase basically does not contain toxic or flammable substances such as H2S, but the gas phase contains substances such as CO and H2S. GB50493-2009 Code for Design of Detection and Alarm Systems for Flammable and Toxic Gases in Petrochemical Industries stipulates as follows: 4.1.2 Detection points shall be installed at the following main sources from which flammable and toxic gases may leak: 1 Sealing parts of gas compressors and liquid pumps ； 2 Liquid sampling port and gas sampling port ； 3 Liquid discharge (water) port and vent port ； 4 Flanges and valve assemblies for equipment and pipelines. Some people say that the liquid pumps mentioned here refer to pumps for flammable liquids such as ammonia and liquefied hydrocarbons, while acid water pumps are not flammable and therefore do not require detection and alarm systems, is that correct? If what he says is true, then why are acid water pumps still designed as explosion-proof pumps?