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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(*) These are for guidance. The risk assessment will indicate need to disinfect as a combination of factors is to be considered.


PPM:

DHW GENERATOR BLOW DOWN

PPM Ref:

LEG48

Frequency:

Quarterly

Examine valves for leaks, damage and corrosion.

Clean and examine gauges and readings for accuracy.

Examine controls and settings (60OC min). Clean strainer elements. Operate valves fully.

Check operation of shunt pumps.
Safety valves:

Examine / operate safety valve. Ensure valve re-seats correctly.


Pumps (Primary heating pumps):

Examine differential gauges (if fitted) for correct pump operation. Clean gauge glasses.

Examine duty pump for smooth running, for leaks, corrosion or damage to pump, housing, altitude gauges and associated pipework.

Examine flexible couplings.

Change over duty pump and make similar inspections, operate all valves fully and test for free travel.
Secondary domestic hot water pump: check for smooth running, for leaks, corrosion or damage to pump, housing and associated pipework.
If unvented domestic hot water system, check pressure in expansion vessels and re-pressure as required, check all associated pipework.
Sludge Test:

If no sludge or debris noticed on initial draining, stop draining, no further action required.

If sludge found, isolate, full drain down, re-fill and pasteurisation.
RECORD SHEET C – LEG48 MUST BE FILLED IN AND RETURNED TO THE AUTHORISED PERSON [WATER]





Procedure:

DHW GENERATOR BLOW DOWN RECORD SHEET

Frequency:

Quarterly

Acceptance date:

Oct’12

File & Form Ref:

C - LEG48

[page 1 of 2]
Next review date:

Oct’14


Property:




Location:





Date:




Time:




Item

Work Description

Comply

(Yes or No)

1

SAFETY CHECK: Before carrying out the procedures detailed below complete a visual safety check of the area. Any defects should be reported immediately.




2

Before blow down procedure starts record temperatures below (pre).




3

Examine valves for leaks, damage and corrosion.




Clean and examine gauges and readings for accuracy.




Examine controls and settings (60OC min). Clean strainer elements.




Operate valves fully.




Check operation of shunt pumps.




4

Examine / operate safety valve. Ensure valve re-seats correctly.




5

Examine differential gauges (if fitted) for correct pump operation.




Clean gauge glasses.




Examine duty pump for smooth running, for leaks, corrosion or damage to pump, housing, altitude gauges and associated pipework.




Examine flexible couplings.




Change over duty pump and make similar inspections, operate all valves fully and test for free travel.




6

Secondary domestic hot water pump: check for smooth running, for leaks, corrosion or damage to pump, housing and associated pipework.




7

If unvented domestic hot water system, check pressure in expansion vessels and re-pressure as required, check all associated pipework.




8

Connect a hose pipe to each of the DHW Generator drain cock, where required, and run to a suitable drain position. Open the drain valve three [3] times over a three [3] minute period. The hose from the drain valve is to discharge direct to drain to minimise the release of any aerosol.




9

Once complete, shut off drain cock and disconnect hose pipe. Ensure all water is drained from hose before storing the pipe. If a large volume of debris has been flushed out, thought shall be given to flushing the hose pipe with chlorinated water in the work shop.




10

After blow down procedure record temperatures below (post).




11

Clear up all spillages & remove all debris to waste. Scale or such debris should not be flushed down the plant room drain, it shall be swept into a small area, allowed to dry and then disposed of into the waste skips.




12

Return completed document to the Authorised Person [Water].




Continued overleaf.....




Procedure:

DHW GENERATOR BLOW DOWN RECORD SHEET

Frequency:

Quarterly

Acceptance date:

Oct’12

File & Form Ref:

C - LEG48

[page 2 of 2]
Next review date:

Oct’14


Property:




Location:





Date:




Time:




Observations and Comments:




DHW generators online:

No. 1.

No. 2

No. 3

No. 4

Time

Pre flush:

Gauge reading (>60 Deg. C)
















Flow (>60 Deg. C)
















Return (>50 Deg. C)
















Cold feed (<20 Deg. C)
















Post flush:

Gauge reading (>60 Deg. C)
















Flow (>60 Deg. C)
















Return (>50 Deg. C)
















Cold feed (<20 Deg. C)
















Details of any corrective action taken:

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:

DHW GENERATOR MONTHLY TEMPERATURE PPM

PPM Ref:

LEG45

Frequency:

Annual

Carry out temperature checks of DHW generators in accordance with HTM 04-01.


Using digital or non-contact calibrated thermometer for taking all required temperatures. The only gauge reading to be taken is that on the flow to ensure it matches the calibrated thermometer reading.
Check that the temperature is above 60OC for the flow pipe out of the DHW generators.
And is not less than 50OC for the return temperature to the DHW generators.
Manual check to confirm secondary hot water recirculation pumps are operating effectively.
Cold water service into the DHW generators is less than 20OC.
Visually inspect all controls, valves and pipework associated with the appliance and for defects noted please raise job sheets and a copy to be given to Authorised Person [Water]
RECORD SHEET C – LEG45 MUST BE FILLED IN AND RETURNED TO THE AUTHORISED PERSON [WATER]






Procedure:

DHW GENERATOR MONTHLY TEMPERATURE RECORD SHEET

Frequency:

Monthly

Acceptance date:

Oct’12

File &

Form Ref:

C - LEG45

Next review date:

Oct’14


Property:




Location:





Date:




Time:




Thermometer No.




Thermometer Calibration No.




System Reference & DHW generator No.

Gauge

(>60 Deg. C)

Flow

(>60 Deg. C)

Return

(>50 Deg. C)

Cold

(<20 Deg. C)

Secondary DHW pump working OK?

All Acceptable?

(Y or N)
















YES / NO

YES / NO
















YES / NO

YES / NO
















YES / NO

YES / NO
















YES / NO

YES / NO
















YES / NO

YES / NO
















YES / NO

YES / NO
















YES / NO

YES / NO
















YES / NO

YES / NO
















YES / NO

YES / NO
















YES / NO

YES / NO
















YES / NO

YES / NO
















YES / NO

YES / NO
















YES / NO

YES / NO
















YES / NO

YES / NO

Details of any corrective actions taken:

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

Competent Person


Name:

Signature:


Date:

Authorised Person [Water]


Name:

Signature:

Date:

Additional docket numbers issued:



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