Document name: Maintenance & Operational Procedures for the control of Legionella, water hygiene, ‘safe’ hot water, cold water, drinking water and non-drinking water. Document type


APPENDIX 4: NEW SYSTEM DESIGN CHECK LIST



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APPENDIX 4: NEW SYSTEM DESIGN CHECK LIST


Checklist for New Water System Designs or Alterations File: 9.1

Scheme:

Project Manager:

Yes/No

Signed / Dated
Design and construction

1

If altering an existing system, has the impact of the alterations on the system been assessed to ensure safe systems at all times?







2

If you are fitting a new system, do any of the materials or fittings used in the water systems support the growth of micro-organisms?







3

Are low corrosion materials used?







4

Do materials and designs comply with the “Water Supply (Water Fittings), Regulations”? Certificate to be supplied confirming so.







5

If fitted, are thermostatic mixing valves [TMV’s] sited as close as possible to the point of use?







6

Are all water temperatures at all outlets greater than 55OC for hot water outlets (un-mixed, or to the mixer) within 1 minute of running and at under 20C for cold water outlets within 2 minutes of running? Contractor to confirm.







7

Are all new systems commissioned appropriately in accordance with L8, HTM04:01 and BSRIA & CIBSE best practice? Is stagnation avoided? Contractor to certificate to this extent.







Design and construction: Cold water system

8

Are low use outlets installed upstream of higher use outlets?







9

Has cold water storage been assessed and minimised, i.e. holds enough for a day’s use only?







10

Is piping insulated and kept away from heat sources [where possible]?







11

Is the cold water tank:







[i] fitted with a cover and insect screen[s] on any pipework open to the atmosphere?







[ii] located in a cool place and protected from extremes of temperature?







[iii] accessible?






Design and construction: Hot water system

12

Does the DHW generator storage capacity meet normal daily fluctuations in hot water use while maintaining a supply temperature of at least 60oC at the DHW generator and at least 55oC at the outlets and 50oC at the return? **







13

Are the hot water distribution pipes insulated?







14

If more than one DHW generator is used, are they connected in parallel?







15

Does the DHW generator have the following fitted:







[i] a drain valve?







[ii] a temperature gauge on the inlet and outlet?







[iii] an access panel?







[vi] Non return valves fitted to the cold and return feeds?







[v] Are fitted with de-stratification loops which are set to run for 1 hr each day.







16

Have all return legs on the hot water circulation system been monitored to ensure they remain above 500C at all times?







17

Are all domestic hot water full temperature legs less than 1m in length.

All reduced temperature legs less than 2m in length?





** Each system to be logged to ensure that under prolonged continuous demand to ensure the following:



  • the flow temperature does not fall below 60OC on more than two occasions for more than 20 minutes in one 24 hour period.

  • The return temperature should always be greater than 50OC.

  • There should never be more than 10 Deg. Difference between flow and return temperatures.

  • Cold water temperature should be <20OC.

The system must achieve 60OC for at least one hour each day throughout the entire vessel (base to top).




APPENDIX 5: BIBLIOGRAPHY


Health Technical Memorandum 04-01: The control of Legionella, hygiene, ‘safe’ hot water, cold water and drinking water systems. Parts A and B :2006


Health Technical Memorandum 03-01: Specialised ventilation for healthcare premises. Parts A and B :2006
Approved Code of Practice, Legionnaires’ disease: the control of Legionella bacteria in water systems. [L8] :2000
The Health & Social Care Act 2008.
The Health and Safety at Work etc Act :1974
The Management of Health and Safety at Work Regulations: 1999
The Water Supply [Water Fittings] Regulations :1999
The Water Supply [Water Quality] Regulations :2000
The Control of Substances Hazardous to Health Regulations :2002
The Building Regulations :1992
BS 7592:2008 - Description: Sampling for Legionella bacteria in water systems. Code of practice
Water Regulations Advisory Scheme [WRAS] Water Regulations Guide :2004
Water Regulations Advisory Scheme [WRAS] Water Fittings and Materials Guide :2005
HSE - INDG253 - Controlling Legionella in nursing and residential care homes

Maintenance & Operational Procedures for control of Legionella, water hygiene, ‘safe’ hot water, cold water, drinking water and non drinking water. [Oct-2012 – version 1.05]

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