Chlorination of drinking water on ships, especially passenger ships

Abstract

The present invention relates to a process for the chlorination of drinking water on board a ship equipped with a drinking water generation and distribution system comprising a recirculation distribution network and an injection device which, at a predetermined injection point IP, will be capable of producing at least one of free chlorine in the water Chlorine compounds are injected into the distribution network. Such a chlorination process comprises a chlorination step a) in which a chlorine compound is injected into the cycle at an injection point IP. The method is further operated by the following steps: - step b), fixing the concentration of free chlorine at the injection point to a program set point SET1 comprised between 0.4 and 1.2 mg / l; - step c), by means of at least one first A detection probe 4 monitors the concentration of free chlorine at or near the injection point; - step d), by means of at least one second detection probe 40 continuously monitors the concentration of free chlorine at a remote point in the distribution network away from the injection point. The injection step a) comprises the sub-step a1) of program chlorination, wherein chlorine compounds are injected into the distribution network such that the concentration of free chlorine in the distribution network at the point of injection is maintained at said program set point SET1. If the second detection probe does not detect a change in the concentration of free chlorine at the remote point relative to the protocol setting, or if the second detection probe detects a concentration change relative to such protocol set point, i.e. the magnitude of the change Below the predetermined safety limit value Diff1 and / or the duration of the change is below the predetermined safety time limit value Δt1 , such scheme chlorination sub-step a2) is carried out.

Description

technical field [0001] The present invention relates to a process for the chlorination of potable water on board ships, especially on passenger ships, and even more particularly on board pleasure boats. [0002] The invention also relates to a system for the generation and distribution of potable water on board ships, especially passenger ships. Background technique [0003] The generation and distribution system of drinking water on board ships, especially large passenger ships, is a complex system which is divided into several subsystems and includes generation means, water purification means and filtration means. [0004] The system is usually fed by an evaporator-distiller system and / or a reverse osmosis-distiller system and / or a bunkering system with potential volumes from 30 tons / day (for cargo ships) up to 500 tons / day (for 100,000 GRT (for passenger ships of gross registered tonnage) changes. The resulting potable water is used for different purposes and is therefo...

AI Technical Summary

Problems solved by technology

In long-term service media, these concentration values ​​are incompatible with many materials used to construct lines, leading to extensive corrosion phenomena

Corrosion and resulting perforation of water supply pipes leading to waterlogging damage, disruption of potable water supply to cabins, equipment rooms and public areas, and operating costs to restore service

[0026] Therefore, use of chlorine at current concentrations results in significant economic losses due to damage to distribution networks, in addition to systemic costs arising from product losses

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