Delivering Quality Potable Water to Offshore …

1 Delivering Quality Potable Water to Offshore Installations Issue 2 18th July 2013 Page 1 of 27 Delivering Quality Potable Water to Offshore Installations Issue 02 - 18th July 2013 Delivering Quality Potable Water to Offshore Installations Issue 2 18th July 2013 Page 2 of 27 This Page has been deliberately left blank Delivering Quality Potable Water to Offshore Installations Issue 2 18th July 2013 Page 3 of 27 Contents 1. Introduction .. 5 Scope .. 5 Aim .. 5 Glossary of Terms .. 6 2. Background Information .. 7 3. Shore-side .. 9 Storage Tanks .. 9 Design and Construction 9 Management and Maintenance 9 Treatment 9 Monitoring 9 Records 9 Stand Pipes and Delivery Hoses .. 9 Management 9 Maintenance 10 Treatment 10 Monitoring 10 Records 10 4. Vessels .. 11 Storage Tanks .. 11 Management 11 Maintenance 11 Treatment 11 Monitoring 11 Records 12 Pipework / Manifolds.

2 12 Management 12 Maintenance 12 Treatment 12 Monitoring 12 Records 12 Hoses .. 12 Management 12 Maintenance 12 Treatment 13 Monitoring 13 Records 13 Delivering Quality Potable Water to Offshore Installations Issue 2 18th July 2013 Page 4 of 27 5. Operations .. 14 Chartering .. 14 Water Quality .. 14 Preventing Stagnation .. 14 Bunkering Shore to Vessel .. 14 Vessel to installation .. 15 Intermediate Bulk Containers .. 15 6. Quarterly Microbiological and Chemical Tests .. 16 Microbiological Tests .. 16 Coliforms/ / Enterococci 16 Total Viable Count 16 Legionella 16 Chemical Tests .. 16 Hydrocarbons 16 Chlorides 17 Appendix 1 - Sampling Protocol .. 19 Summary of Method .. 19 Apparatus .. 19 Procedure .. 19 Appendix 2 Super Chlorination Procedure.

3 21 Procedure .. 21 Appendix 3 References .. 22 Appendix 4 List of Contributors .. 23 Appendix 5 Audit Proforma .. 24 Figures Figure 1: Potable Water Supply Chain .. 8 Tables Table 1: Glossary of Terms .. 6 Table 2: Bacteriological / Chemical Quality Guidance .. 18 Delivering Quality Potable Water to Offshore Installations Issue 2 18th July 2013 Page 5 of 27 1. Introduction Drinking Water must be wholesome , a term that is defined in law and measured against a set of defined standards set by national regulations. These standards are set to protect public health and the definition of wholesome reflects the importance of ensuring that Water Quality is acceptable to consumers. Legislation, and the legal standards in the UK, is based upon those which are set in Europe in the Drinking Water Directive 1998 which are derived from the World Health Organisation in the Guidelines for Drinking- Water Quality .

4 The supply of wholesome drinking Water (hereafter referred to as Potable Water ) to Offshore installations is the responsibility of a number of stakeholders including the supplier, charterer and carrier of the Water . Potable Water for Offshore installations, carried as cargo on Offshore supply vessels, is intended for domestic purposes including, but not limited to, cooking, drinking, food preparation and washing. The Offshore Installations and Pipeline Works (Management and Administration) Regulations (MAR) 1995 requires: The duty holder shall ensure that all provisions for consumption by persons on the Offshore installation are fit for human consumption, palatable and of good Quality . L70 A guide to the Offshore Installations and Pipelines Works (Management and Administration) Regulations 1995 Guidance on Regulations states: Provisions include food and drink (including Water ).

5 They should be nutritious, wholesome and safe to eat or drink. Arrangements should ensure that provisions meet these criteria when supplied and that they continue to do so while stored on the installation . Scope This document is applicable to vessels operating in the United Kingdom Continental Shelf (UKCS), but the principles can be applied elsewhere. Aim This document provides practical guidance on Delivering Quality Potable Water to Offshore installations. The maintenance of Offshore installation hoses is not covered by these guidelines. Delivering Quality Potable Water to Offshore Installations Issue 2 18th July 2013 Page 6 of 27 Glossary of Terms Term Definition Biofilm Complex microbial ecosystems consisting of microorganisms attached to a surface which may or may not be visible. cfu Colony Forming Unit Chloramination A means of disinfection used by some municipal Water suppliers based on adding ammonia and chlorine individually that react to produce chloramine disinfectant.

6 Chlorination The act of adding chlorine to Water to maintain a sufficient concentration to ensure ongoing disinfection. Chlorine Combined Chlorine when measured from a municipal source, this is the amount of stored chlorine that is inactive in Water until it is released over time through degradation. Free Chlorine this is the active chlorine in Water available for treating bacteria. It is sometimes referred to as residual chlorine and is used to measure the disinfection strength of Water which has been treated using chlorine based disinfection products. Total Chlorine the total amount of chlorine in Water including free and combined chlorine. DWI Drinking Water Inspectorate GCMS Gas Chromatography Mass Spectrometry ISM International Management Code for the Safe Operation of Ships and for Pollution Prevention NUI Normally Unattended installation PPB Parts Per Billion PPM Parts Per Million TVC Total Viable Count THC Total Hydrocarbon Content (within Water ) UK United Kingdom UKCS United Kingdom Continental Shelf WHO World Health Organisation Wholesomeness As defined in The Water Supply ( Water Quality ) Regulations 2000 & The Water Supply ( Water Quality ) (Scotland)

7 Regulations 2001 WRAS Water Regulations Advisory Scheme Table 1: Glossary of Terms Delivering Quality Potable Water to Offshore Installations Issue 2 18th July 2013 Page 7 of 27 2. Background Information Revision 1 of the Guidelines for the Carriage of Potable Water for Supply to Offshore Locations required updating to reflect improvements in industry practice. Revision 2 (this document) has been re-named Delivering Quality Potable Water to Offshore Installations to better reflect the intent of the document. For the purposes of this document, it is accepted that Water delivered to stand pipes or private networks from the municipal Water supply in the United Kingdom (UK) is of a wholesome Quality given the municipal supplier s legal duty of care. Figure 1 provides an overview of the supply chain of Potable Water to Offshore installations and the potential areas of contamination.

8 Where there is a risk of contamination, control measures are required to minimise this risk. Sections 3 & 4 are structured to reflect the steps in the supply chain where control measures will be applicable. Control measures include, but are not limited to: Management Maintenance Treatment Monitoring Delivering Quality Potable Water to Offshore Installations Issue 2 18th July 2013 Page 8 of 27 Figure 1: Potable Water Supply Chain Delivering Quality Potable Water to Offshore Installations Issue 2 18th July 2013 Page 9 of 27 3. Shore-side Any privately owned tanks, standpipes, hoses or pipework downstream of the municipal supply (Scenario B and Scenario C in Figure 1) are not under the direct control of the municipal supplier. They are the responsibility of the onshore owner/operator of that site. Storage Tanks Design and Construction Shore-side storage tanks should be constructed with Water Regulations Advisory Scheme (WRAS) approved materials and components and be designed so that they have suitable access for inspection and maintenance.

9 Management and Maintenance Those responsible for storage tanks should ensure a regular turn-over of Water to avoid stagnation. They must also be able to demonstrate that the hygienic condition of the tanks is checked by annual inspection. Where these parameters are not met, cleaning and disinfection must take place. Any repairs or parts replaced must use WRAS approved materials and components. Treatment The free chlorine concentrations in Water must be maintained above at the point of delivery to the vessel. Monitoring Daily chlorine measurement, quarterly microbial and chemical sampling (see Section 6) and annual inspections to check for coating breakdown, rust, deposits or organic growth are required. If sample results or inspections suggest problems with Water Quality remedial actions must be taken.

10 Records A Water management plan must be developed to include, as a minimum, maintenance schedules, inspection and cleaning routines, Water treatment methods, sampling and testing frequency and results. These records should be readily available for periodic audit and be retained for a period of 3 years. Stand Pipes and Delivery Hoses Management Dedicated stand pipes used for the delivery of Water to vessels should be treated as part of the hose and managed as detailed below. Stand pipes must be properly capped or covered to minimise contamination. Only dedicated uniquely identified Potable Water hoses should be used for the transfer of Potable Water . When not in use, all Water -bunkering hoses must be properly capped and stored in such a way as to avoid contamination. End caps must be inspected, cleaned and replaced is required.