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



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PPM:

DHW GENERATOR DE-STRATIFICATION LOGGING PPM

PPM Ref:

LEG02

Frequency:

Every 2 years

Data logger to be installed.


Thermocouple sensors to be fitted to:

Flow pipe

Return feed pipe

Cold feed pipe (pre TMV)



Base of DHW generator
Data logger set to capture data over a 7 day period at 5 minute intervals.
The data to be downloaded from logger into spreadsheet for analysis and filtering of data.
RECORD SHEET C – LEG02 MUST BE FILLED IN AND RETURNED TO THE AUTHORISED PERSON [WATER]






Procedure:

DHW GENERATOR DE-STRATIFICATION LOGGING RECORD SHEET

Frequency:

Every two years

Acceptance date:

Oct’12

File & Form Ref:

C – LEG02

Next review date:

Oct’14

Date logging commenced:





System Reference:





DHW generator Id. Nos.





Logging device used (detail S/N):




TASK

COMPLY
(YES or NO)

Logging period covered 7 consecutive days?

Yes / No

Flow temperature >60OC for 23 hrs & 40 minutes for every 24 hour period logged*?

Yes / No

Base of DHW generator is always 50OC or greater throughout the entire logging period*?

Yes / No

Base of DHW generator achieves 60OC for at least 1 hour in every 24 hour period*?

Yes / No

Hard copy logging data attached including copy of logging analysis report?

All logging data should be held in 2.4 of the document management system.

Yes / No

Detail of corrective action taken to address any issues highlighted as a result of the logging exercise:

Observation and comments:

* Analysis of data using a spreadsheet programme with autofilters applied will assist in this process.

I, the undersigned, have completed the works outlined above:

Competent Person


Name:

Signature:


Date:

Authorised Person [Water]


Name:

Signature:

Date:

Additional docket numbers issued:




PPM:

INCOMING MAINS COLD WATER TEMPERATURE RECORD SHEET

PPM Ref:

LEG37

Frequency:

Biannually

Incoming mains.

1. Lift manhole cover

2. Check and record the temperature of incoming pipework at sensor point.

3. Replace manhole cover.
All readings should be less than 20OC.
Where present take water meter readings and record.
Report any reading above 15OC.to a Authorised Person [Water] immediately.
Tools:


  • Manhole keys,

  • Calibrated digital thermometer,

  • Second person to lift and replace manhole covers.

Manhole at entry point in grounds:



RECORD SHEET C – LEG37 MUST BE FILLED IN AND RETURNED TO THE RESPONS AUTHORISED IBLE PERSON [WATER]






Procedure:

INCOMING MAINS COLD WATER TEMPERATURE RECORD SHEET

Frequency:

Biannually

Acceptance date:

Oct’12

File & Form Ref:

C – LEG37

Next review date:

Oct’14


Property:





Mains Water Manhole Location:





Date:





Time:





TASK

COMPLY

[YES or NO]

Manhole inspection cover securely in place and not damaged or missing?

Yes / No

Manhole clear of debris and water?

Yes / No

Water meter intact?

Yes / No

Mains cold water temperature (must be <20OC)?

........ OC

Water meter reading?

....... M3

Manhole inspection cover replaced securely leaving no raised edges / trip hazards?

Yes / No

Observation and comments:


I, the undersigned, have completed the works outlined above:

Competent Person


Name:

Signature:


Date:

Authorised Person [Water]


Name:

Signature:

Date:

Additional docket numbers issued:






PPM:

DOMESTIC COLD WATER TANK INSPECTION PPM

PPM Ref:

LEG32

Frequency:

Biannually

Check and record the temperature of;

1. Mains incoming cold water temperature - entry point to building.

2. The cold water feed

3. The surface water of the tank

4. The outlet water of the tank must be less than 20OC.



5. Visually inspect general condition of tank, also signs of debris / sediment / stagnation.
Ensure all lids and covers are correctly aligned and in place.
Check overflows, warning pipes and vent pipes are not discharging and are free of obstructions.
Lids must be reinstated after work has been completed.
Enter the readings onto the appropriate section of the record sheet.
Report immediately to area facilities officer any abnormal readings.
RECORD SHEET C – LEG32 MUST BE FILLED IN AND RETURNED TO THE AUTHORISED PERSON [WATER]






Procedure:

DOMESTIC COLD WATER TANK INSPECTION RECORD SHEET

Frequency:

Biannually

Acceptance date:

Oct’12

File & Form Ref:

C – LEG32

Next review date:

Oct’14


Property:




Location:





System Reference:





Tank Id. No.:






Date:




Time:




Incoming MCW TOC at point of entry to building:




Cold tank incoming MCW TOC:




Cold tank storage TOC:




Cold tank outflow TOC:




Ambient air TOC in tank room:




Ambient air TOC outside:




QUESTION

COMPLY

[YES or NO]

Tank room access locked? [if applicable]

Yes / No

Adequate cover / inspection hatch fitted to tank?

Yes / No

Cover / inspection hatch secure?

Yes / No

Insect screens & filters fitted? (if not record details)

Yes / No

Insulation material for tank and pipe is adequate and in place? (if not record details)

Yes / No

External condition ok? Area free from debris / clutter & top of tank to be clear (if not record details).

Yes / No

Internal condition ok? Free from vermin / insects. Note the degree of sediment at % cover (if not record details).

Yes / No

Condition of water? Stagnant or turning over. Is there evidence of sufficient turnover? (if not record details)

Yes / No

Water level ok? Single and multiple linked tanks (if not record details).

Yes / No

Operation of ball valve ok? (if not record details)

Yes / No

Operation of isolation valves ok? (if not record details)

Yes / No

Pipework configuration correct (inlet and outlet at opposite ends)? (if not record details)

Yes / No

DHW vent not over drinking water tank? (if not record details)

Yes / No

Observation and comments:



I, the undersigned, have completed the works outlined above:

Competent Person


Name:

Signature:


Date:

Authorised Person [Water]


Name:

Signature:

Date:

Additional docket numbers issued:






PPM:

DOMESTIC COLD WATER TANK CLEANING PPM

PPM Ref:

LEG07 [page 1 of 2]

Frequency:

As necessary

Tank cleaning will be undertaken by an approved specialist contractor.


The pre-maintenance authorisation record will need to be completed prior to any works commencing.
[a] Isolate and shut down the cold water storage tank and remove the cover or inspection hatch. The operator shall display warning labels in and around the plant room stating chlorination in progress;

[b] The tank shall be examined visually for signs of corrosion [if applicable], debris and biological growth. The water storage temperature and any such defects identified are recorded for report to the Estates department.

[c] The relevant water authority must be informed before dumping the tank contents. The relevant water authority will need to be informed of the volume to be discharged, any further quantities of chlorinated water to be dumped as a result of tank cleaning should be included. It may be necessary to neutralise the chlorine with sodium thiosulphate before dumping.

[d] Tank cleaning shall be performed using non-abrasive cleaning materials;

[e] Protective clothing, footwear, face goggles and masks are to be employed. These items must be specific to the task of cleaning and chlorination, and must not have been used for other activities;

[f] Where tanks are to be painted, only paints or coatings and materials that are recognised and approved by the WRc and detailed in "The Water Fittings and Materials Directory" shall be employed. The specification for any such product must be submitted to the Authorised Person or their nominated deputies for their approval prior to use;

[g] Details of all cleaning and painting materials shall be listed on the cold water tank inspection record form LEG07;

[h] On completion of the cleaning / painting exercise, and after the necessary paint maturing period [if required], the tank shall be thoroughly flushed and washed out with water, refilled to the tanks normal working level and dosed to a level of 50mg/l of free residual chlorine. The tank shall be left to stand for a minimum period of one [1] hour. During this period the level of free chlorine shall be monitored and maintained at 50 mg/l;

[i] On completion of the tank chlorination period, the tank contents shall be discharged as previously detailed in section [c]. The tank is then refilled to its normal operating level with fresh water. The free chlorine level in the tank water shall be monitored until it matches that of the incoming water supply;




PPM:

DOMESTIC COLD WATER TANK CLEANING PPM

PPM Ref:

LEG07 [page 2 of 2]

Frequency:

As necessary

The analysis shall include:



Full Bacteriological Examination

Unit of measure

Acceptable parameter

Total coliforms

/ 100ml

0

E coli

/ 100ml

0

Colony Count @ 2 days (+/-4hrs) @ 37oC

/ ml

No abnormal change*

* It is worth noting that colony counts can vary significantly between regions and seasons. The benefit of such data is the comparison for any indication of seasonal change and longer term changes in the general bacteriological quality of the water.

[k] On receipt of analysis results, these shall be submitted to the Authorised Person [Water] and the Infection Control Team. The Infection Control Consultant may be required to aid with the interpretation of the results, and the identification of remedial actions if necessary. The Infection Control Team shall certify if the water is of a drinking water quality.

[l] On completion of the tank cleaning or inspection exercise, it is recommended that details be entered onto a tank cleaning record label to be posted on or adjacent to the tank. Such a label must be robust, and able to withstand contact with water;


  1. Details of findings, actions taken and test results are to be entered onto the Domestic Cold Water Storage Tank Cleaning Record Form LEG07. Chlorination Certificates are to be obtained and held in file LEG07.

Any defects shall be reported immediately to the Authorised person or nominated deputies.

Once a system has been filled, the Trust and / or its Contractors will not drain that system unless full disinfection is to be undertaken. Before the tank can be brought into service the Infection Control Team must certify the water as being of drinking water quality. The only exception is in the case of an emergency and with the consent of the Authorised Person [Water], acting on the advice of the Infection Control team.




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