Operating procedures for a drinking water storage tank to prevent Legionella infection

摘要

An operating procedure for a drinking water storage system (100) shall include at least the following steps to avoid Legionella infections:-Determine and start a reference period t = 24 h;maintaining a warm water temperature value Tsw at a quantity of water stored in a drinking water storage tank (10);Measurements of the quantity of water withdrawn from the drinking water storage tank (10) during the period considered t and continuously adding up to a quantity E;Comparison of volume E with volume VT of drinking water storage (10) at the end of the period considered t:When E is VT: maintaining a regular heating mode by keeping the water temperature in the drinking water storage (10) at the level of the hot water temperature set value Tsw;If E VT: transition to a disinfection mode with heating of the water quantity in the drinking water storage (10) up to a disinfection water temperature TD TSW;After a previous heating up to a disinfection water temperature TD, the reference period t begins anew. A return mode shall be initiated in which the hot water temperature value Tsw is reduced at least once in such a way that, within the reference period t, the amount E is greater than or equal to the storage volume VT.