Pre-Commission Chemical Cleaning
Guardian Water Treatment recognises the need for modern water systems
to have the highest level of cleanliness prior to the commissioning and setting
to work of the systems. System contaminants if not removed at the pre-commission
cleaning stage, can result in a system over achieving optimum performance. Guardian
offers a fully comprehensive pre-commission cleaning service in accordance with
the current BSRIA guidelines AG1/2001.
Our programme will usually follow the following methodology:
System Review
A fully trained Guardian operative will attend site prior to our attendance
for pre-commission procedures. They will liaise with the site project manager
and ensure the adequate provision of flushing points, water to be for flushing
procedures and adequate foul sewage drainage points. If required these can be
illustrated on the system drawings for installation by mechanical filters. A
site specific method statement will then be provided for approval. At this time
a water discharge license will be applied for, from the relevant water authority.
This is now a legal requirement when dumping large amounts of water with chemical
through the foul sewer.
Also, at this time it is prudent to take a sample from the water to be used for the flushing procedure. This sample will be sent for independent analysis and test for TUV & Pseudomonas.
When results are received, a decision can then be reached on the processes to be followed. (For pseudomonas information please sees information elsewhere in the brochure.)
The system is to be fully pressure tested, filled and vented prior to our arrival
on site.
Cleaning Process
1. System dynamic flushing
The objective is to remove as much debris as possible from the system to reduce
the potential for system blockages. This process maximises flow rates through
main risers and sub branches as detailed within the BSRIA AG1/2001 guidelines.
2. Biocide Wash
If the laboratory analysis indicates high level of bacteria (pseudomonas) within
the system, a full biocide was will be carried out to remove bio films and bacteria
from the system.
3. Chemical Clean
When the system is set to work, movement of the pipe work due to thermal expansion
or contraction may cause contaminants to be released into the fluid stream (iron
oxide). The objective of chemical cleaning is to loosen surface deposits so
they can be removed from the system to create a stable surface larger within
the pipe work, which, if maintained by an ongoing water treatment regime, will
resist further corrosion.
On the completion of the chemical clean, the system is then balanced flushed so system parameters are within 10% of incoming mains water.
4. System Inhibiting
On completion of the chemical clean, the system will be does with a suitable
corrosion inhibitor and biocide to ensure ongoing protection from water to metal
corrosion and bacteria based problems. At this stage, samples will be taken
and submitted for independent analysis (as detailed within BSRIA AG1/2001).
5. Back Flushing
All terminal units should have been isolated during the pre-flushing procedures.
The purpose of back-flushing is to remove any small debris that has collected
within the terminal units.
On completion of our flushing procedures, a full set of documents will be forwarded for addition to the site O&M manuals. A copy of a typical set of documents can be provided for further information if required.
The Cost of Failure
If this work is not completed to the highest level, it will have a knock
on effect to other trades. This can lead to high remedial costs and the delay
in practical completion, which could result in financial penalties.
Guardian Water Treatment achieve optimum results by ensuring only OUR framed operatives attend site, resulting in us retaining complete control over the procedures and work practices.
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For further information on the services we provide,
give us a call on 01268 287477 or email info@gwtltd.com