Water Report 129. Safe, Sufficient and Good Potable Water Offshore

Издание на английском языке
This publication is the 5th edition of the guidelines on the provision of drinking water at marine facilities, issued by the Norwegian Institute of Public Health (NIPH). It includes updates related to the termination of NIPH's work in the field of offshore projects, as well as new recommendations on water temperature testing and changes in disinfection procedures. The main purpose of the guide is to provide information on the design and operation of drinking water systems at offshore facilities, ensuring water safety and quality. In the future, the guidelines will be updated by the Norwegian Maritime Authority every four years. The publication covers important aspects, including water quality management and system design, and takes into account new requirements and recommendations for effective operation in difficult conditions.
ISSN 1503-2167

Contents
1 Introduction
1.1 Sufficient, safe and good potable water
1.2 How to use the guideline
1.2.1 Guideline status
1.2.2 Guideline application
1.3 Definitions
2. Regulations and authorities
2.1 Authorities
2.2 RegulationS
2.2.1 potable Water Regulations
2.2.2 HSE Regulations
2.2.3 NMA potable water regulations
2.2.4 the Law on Food
2.3 Norwegian Institute of public Health -functions
2.4 Product approval
3. Management systems
3.1 Potable water documentation
3.2 Competence
3.3 Maintenance system
3.4 Collection, processing and use of data
3.5 Deviation handling
3.6 Emergency preparedness
3.7 Internal audits
4. Water quality
4.1 Potable water and health
4.1.1 Microbes
4.1.2 Hazardous chemical substances
4.2 Other general requirements
4.2.1 Odour and taste
4.2.2 Discoloured and turbid water
4.2.3 Corrosive water
4.2.4 Itching and skin irritation
4.2.5 Water temperature
4.3 Quality requirements
4.3.1 Daily analyses
4.3.2 Analyses when bunkering
4.3.3 Monthly routine control
4.3.4 Extended annual routine control
4.3.5 Parameters that may be exempt
4.4 Sample points
4.5 Drinking water in bottles or other packaging
4.6 Essential analysis equipment
5. General design requirements
5.1 Design example
5.2 Advice for design and construction
5.2.1 Ergonomic design
5.2.2 Safeguarding against mistakes
5.2.3 Storage capacity requirements
5.2.4 Hygienic barriers – preventing contamination
5.2.5 Placing, marking and protecting the equipment
5.2.6 Location and design of sample points
5.2.7 Paints and protective coatings
5.3 System alterations
6. Potable water production
6.1 Seawater inlets
6.1.1 Possible pollution threats
6.1.2 Placing seawater inlets
6.2 Evaporation
6.3 Reverse osmosis
6.4 Conductivity control
6.5 Use of chemicals
7 Bunkering potable water
7.1 Design of bunkering system, including water circulation
7.2 Disinfection requirements
7.2.1 Flow meter-regulated dosing
7.2.2 Manually-regulated pump dosing
7.3 Bunkering procedures
7.3.1 Prior to bunkering
7.3.2 Bunkering
7.3.3 After bunkering
7.4 Logging
8. Water treatment
8.1 Corrosion control
8.1.1 Alkaline filter
8.1.2 Sodium silicate
8.2 Disinfection by chlorination
8.2.1 The significance of water quality
8.2.2 Sodium hypochlorite
8.2.3 Calcium hypochlorite
8.2.4 Design
8.2.5 Operation and maintenance
8.3 Disinfection by UV radiation
8.3.1 The importance of water quality
8.3.2 Design, dimensioning and NIPH-evaluation
8.3.3 Operation and maintenance
8.4 Active carbon filters
9. Storage tanks and distribution system
9.1 Potable water tanks
9.1.1 Storage capacity
9.1.2 Design and location
9.1.3 Operation and maintenance
9.1.4 Application of protective coatings
9.2 Water distribution system
9.2.1 General design advice
9.2.2 Pressurising systems
9.2.3 Cold water
9.2.4 Hot water
9.2.5 protection against pollution
9.2.6 Materials
9.2.7 Legionella prevention
9.2.8 Insulation
9.2.9 Operation and maintenance
9.2.10 Pressure/leakage testing
9.2.11 Special considerations for units operating in warm waters
10. Water supply on diving vessels -special requirements
10.1 Water analyses
10.2 Water production
10.3 Design
10.4 Maintenance
Appendix 1 - Checklist for design of potable water systems on offshore units
Appendix 2 - Checklist for operational documentation of a potable water system (Potable water manual)
Appendix 3 - Example of a daily potable water logbook
Appendix 4 - Recommended analysis programme and quality requirements
Appendix 5 - Bunkering log
Appendix 6 - Recommended requirements to supply bases and vessels
Appendix 7 - Instructions for bacteriological testing of potable water
Appendix 8 - Instructions for physiochemical sampling, including annual analyses
Appendix 9 - Troubleshooting guide
Appendix 10 - Recommended procedures for bunkering potable water
Appendix 11 - Calculations in connection with chlorination
Appendix 12 - Cleaning and disinfection of a distribution system
Appendix 13 - Cleaning and disinfection of potable water tanks
Appendix 14 - procedure for water temperature testing