TREATMENTS AND FLUIDS
for each metal coupon less than the appropriate tolerance is deemed a pass. Upon passing this testing protocol, the fluid is accredited to the ASTM D1384 / D3306 standards.
The correct deployment of the fluid The second way to encourage your cooling system to fail is to not clean or sanitise the system when changing or introducing a new fluid. It is critical that the system undergoes a thorough pre-commission cleaning process. Whether it is a new or a refit system there will be contaminants present. New equipment will contain debris, welding slag, and potentially chemicals and residues from the manufacturing process.
Lubricants and oils are also used to protect hardware during storage and transport. These contaminants need to be removed from the coolant system before it is put to use. Refit systems will also need contaminants removed due to the fact these systems have been previously deployed. These contaminants would
www.acr-news.com
include degraded antifreeze, rust, scale and sludge.
The Building Service Research and
Information Association (BSRIA) have developed independent guidance for everyone involved in the commissioning of closed-loop pipework since 1991. This tried and tested guidance was updated earlier this year in the form of BG 29/2021, and Kilfrost recommend its use to all of their customers. Once put in place, the coolant system should be thoroughly cleaned using a pH neutral solution which is compatible with all construction materials. This should be followed by descaling if required. The system then needs to be sanitised using a disinfectant and biocide solution. The biocide needs to be effective against a wide range of microorganisms including Legionella. Inadequate removal of the debris, welding
slag, and potentially chemicals and residues from new equipment may have a detrimental effect on the effectiveness of the corrosion
protection designed for the fluid. These contaminations work to degrade the corrosion inhibition, intended to protect the system components.
Refit systems will also need contaminants removed, if microbiological contaminations and hard water ions are present, than this may lead to scaling, biofouling and fluid degradation. The effects of fluid degradation can also reduce the heat transfer efficiency due to obstruction of the piping, a possible reduction of pump service life and unscheduled forced system shutdowns all impacting the efficiency of the cooling system. To encourage fluid thinking and to discourage failures, select the correct fluid with accredited corrosion test standards. Furthermore, ensure the system has had
an entire pre-commission cleaning process to remove contaminants will degrade the effectiveness of the fluid you are using. In short, use the right fluid, and use it in the right way for best system protection.
May 2021 31
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48
