Fresh Water Plant Case Study

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1) The system that holds the fresh water making system shall be designed in such a manner to achieve 100% redundancy during installation.
If the fresh water plant on board is less then 2, each plant should be able to produce and supply 100% of the ship’s total daily requirement.
If the fresh water plant on board is more then 2, all plant should be of equal capacity with one plant being spare.

2) To prevent contamination of the water, the fresh water tank shall not be joined to another system tank containing a possible contamination.

No pipe work shall penetrate to fresh water tank from any other system to avoid possible leakage. There shall be sufficient space between the tanks to support regular inspections.

3) The system should hold
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4) Dual sand filters with automatic back flush facility shall be used in RO plants to prevent the mass contamination of semi-permeable membrane while the plant is functional in risk areas or close to inshore.

5) The piping system shall be flexible to absorb vibration in heavy sea condition and be able to survive in extreme environmental conditions. 6) All material used on the potable water system shall confirm to the requirements of AS 4020 to minimise corrosion and erosion.

7) The RO plant shall be capable of continuous stable operation under all ship operational and environmental conditions as specified in ship class machinery specification.

8) The plant and the associated system including piping and installation shall conform to shock requirements DEF (AUST) 5000 Vol--part—

9) The potable plant system will be required to produce water of potable quality at required rate using seawater with salinity of 40,000 ppm and at temperature in the range 2°C to 35°C. The final temperature of the “made water” is not to exceed 45°C with a maximum sea temperature of 35°C.

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4) In order to prevent the mass contamination of potable water due to membrane failure in the RO system.

5) In order to avoid system failure during heavy sea and extreme environmental condition and there by assuring continuous availability ship’s total fresh water daily requirement.

6) In order to avoid degradation of the potable system and maintain water quality.

7) In order to assure the RO system operates under all ship operational and environmental conditions

8) In order to assure the RO system survives in extreme sea state and avoid plant failure.

9) In order to assure that the quality and rate is not compromised by the varying seawater temperature.

10) To assure that the water quality for crew’s consumption is not compromised.

11) To assure that the water quality is not compromised.

12) To assure that the machineries and electronic equipment remain immune to corrosion and degradation effect.

13) To engine personnel hygiene is not compromised on the ship causing widespread outbreak on any disease.

14) To assure sufficient water quantity for usage at the rate

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