REMS Multi-Push SLW Betriebsanleitung Seite 22

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6. Display screen: Water pressure (p H
flushing time (t H O), water change (n H
2
\ Enter
7. Esc >> Start menu \ Memory Manager, data transfer >> 3.6
3.1.2. Flush with water/air mixture with intermittent compressed air program
The cleaning effect by flushing can be reinforced by adding compressed air. In
accordance with EN 806-4:2010 and information leaflet "Flushing, disinfection
and commissioning of drinking water installations" (August 2014) of the German
Central Association for Sanitary, Heating and Air Conditioning (ZVSHK), the
drinking water used for flushing must be filtrated whereby particles ≥ 150 µm
must be held back and the water must be perfectly fit for drinking (REMS fine
filter with filter cartridge 90 µm, Art. No. 115609). "The pipe system can be flushed
under pressure with a drinking water/air mixture intermittently with a minimum
flow velocity in every pipe section of 0.5 m/s. A certain minimum number of tap
fittings must be opened for this. If the minimum volume flow is not reached with
full filling of the distribution pipe in a section of the pipe system to be flushed, a
storage tank and a pump must be used for flushing." "The system must be flushed
section by section depending on the size of the installation and the lay of the
pipes. No flushing section may exceed a pipe section length of 100 m."
Greatest rated width of the pipe in the flushed
section, DN
Greatest rated width of the pipe in the flushed
section, in inches
Minimum volume flow with fully filled pipe
section, in l/min
Minimum number of DN 15 (½") tapping
points to be opened fully or a corresponding
cross-sectional area
Table 2: Recommended minimum flow and minimum number of tapping points
depending on the greatest rated diameter of the pipe in the flushed section
which must be opened for the flushing process (for a minimum flow velocity of
0.5 m/s)" (EN 806-4:2010, lines in italics added, limiting to DN 50). Two or more
REMS Multi-Push can be connected in parallel to flush greater rated widths.
The manual actuation of the setting fittings for the supply of intermittent
compressed air described in EN 806-4:2010 and in the information leaflet
"Flushing, Disinfection and Commissioning of Drinking Water Installations"
(August 2014) of the German Central Association for Sanitary, Heating and Air
Conditioning (ZVSHK) takes place automatically in REMS Multi-Push. The
compressed air is fed with an excess pressure of 0.5 bar above the measured
water pressure. The compressed air supply lasts 5 s, the stagnation phase
(without compressed air) lasts 2 s.
REMS Multi-Push displays the achieved flow velocity and the achieved volume
flow on the screen among other things.
Program sequence ↑ ↓ (8):
1. Flush \ Enter
2. Intermittent compressed air \ Enter
3. Check default max. DN according to table 2 and change if necessary
(11) \ ↓
4. Enter water volume of the flushing section VA H
(see Fig. 6)
5. Open the water supply. If the minimum flow velocity v H
minimum volume flow VS H
The flushing time (according to information leaflet T 84-2004 "Flushing,
Disinfection and Commissioning of Drinking Water Installations" of the
German Central Association for Sanitary, Heating and Air Conditioning)
depends on the pipe length and should not drop below 15 s per metre. The
flushing time must be at least 2 minutes per tapping point.
(If the defaults v H O and VS H
2
the cause, repeat the process)
6. Display screen: Water pressure (p H
flushing time (t H O), volume of used water (V H
2
\ Enter
7. Esc >> Start menu \ Memory Manager, data transfer >> 3.6
3.1.3. Flush with water/air mixture with constant compressed air program
The compressed air is fed continuously with an excess pressure of 0.5 bar
above the measured water pressure in this program. The compressed air pulses
in the program 3.1.2. flushing with water/air mixture with intermittent compressed
air" are omitted here. Although these considerably improve the cleaning effect,
they subject the pipes to greater stress. If there are any reservations about
the strength of the pipes to be flushed, this program at least achieves an
improvement of the cleaning effect in comparison with program 3.1.1. flushing
with water (without air supply)" by a jolt-free turbulence due to the constantly
fed compressed air.
REMS Multi-Push displays the used water volume on the screen among other
things.
Program sequence ↑ ↓ (8):
1. Flush \ Enter
2. Continuous air flow \ Enter
3. Check default max. DN according to table 2 and change if necessary
(11) \ ↓
4. Enter water volume of the flushing section VA H
(see Fig. 6)
22
O), minimum flow velocity (v H
2
O), volume of used water (V H
2
25 32 40
1" 1¼" 1½"
15 25 38
1 2 3
O (0-999 l) (11) \ Enter
2
O = 0,5 m/s, the
2
O and the flushing time are reached \ Enter
2
O are not reached: \ Esc = cancel, clarify
2
O), minimum flow velocity (v H
2
O), volume flow (VS H
2
O (0-999 l) (11) \ Enter
2
O), 5. Open the water supply. To exit \ Enter, (\ Esc = cancel)
2
O) 6. Display screen: Water pressure (p H
2
volume (V H O) \ Enter
2
7. Esc >> Start menu \ Memory Manager, data transfer >> 3.6
3.2. Disinfection of drinking water installations program
CAUTION
No drinking water may be be drawn off for consumers during disinfection
of drinking water installations!
The European standard EN 806-4: 2010 prescribes the following for the
"Selection of disinfectants":
"Drinking water installations may be disinfected after flushing if this is prescribed
by a responsible person or authority."
"All chemicals that are used for the disinfection of drinking water installations
must meet the requirements for chemicals for water treatment which are spec-
ified in European standards or, if European standards are not applicable, in
national standards."
"Disinfectants must be used and applied in agreement with the appropriate EC
directives and all local or national regulations."
"Transport, storage, handling and use of all these disinfectants can be dangerous,
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therefore health and safety requirements must be strictly observed."
"The system must be filled with the disinfection solution with the initial concen-
2"
tration and for the contact time defined by the disinfectant manufacturer. If the
remaining concentration at the end of the contact time is below the manufac-
59
turer's recommendation, the whole disinfection process may have to be repeated
until the remaining concentration after the corresponding contact time has been
reached. After successful disinfection, the system must be drained immediately
4
and flushed thoroughly with drinking water. Flushing must be continued according
to the instructions/recommendations of the disinfectant or until the disinfectant
can no longer be traced or is below the level permitted by national regulations.
Persons carrying out the disinfection must be adequately qualified."
"After flushing a sample (samples) must be taken and subjected to a bacteri-
ological examination. If the bacteriological examination of the sample/samples
reveals that insufficient disinfection has been achieved, the installation must
be flushed and disinfected again, then further samples must be taken."
"A full record of the details of the entire procedure and the test results must be
compiled and submitted to the owner of the building."
Technical Rule – Worksheet DVGW W 557 (A) October 2012 of the German
Association of the Gas and Water Industry e.V. (DVGW).
The following must be observed for Germany: "All chemicals including the
additives, that are used for the disinfection of drinking water installations must
meet the requirements for chemicals for water treatment which are defined in
European or German standards (DIN EN 806-4)." "Every installation disinfec-
tion stresses the materials and components of the drinking water installation
so that the drinking water installation can be damaged."
"If the chemical disinfection is carried out section by section, the line sections
to be treated must be shut off from the rest of the drinking water installation.
Opening the tapping points of the section of the installation to be disinfected
one after another ensures that the disinfectant gets into the whole section." "At
the end of the exposure time, a minimum concentration dependent on the initial
disinfectant concentration and exposure time necessary to assure disinfection
must be verifiable at all tapping points. This must be checked at least at every
tapping point of the individual lines farthest away from the dosing point.
"At the end of the disinfection of drinking water installations, the used disinfec-
tion solution must be cleared so that no damage to the environment is caused.
The oxidising effect of the disinfectant can be rendered ineffective by adding
reducers. The pH value must also be observed and corrected if necessary.
An application concentration for the dosing solution for hydrogen peroxide H
of 150 mg H O / l and an exposure time of 24 hours are recommended.
2 2
Information leaflet "Flushing, disinfection and commissioning of drinking
O),
2
water installations" (August 2014) of the German Central Association for
O)
2
Sanitary, Heating and Air Conditioning (ZVSHK)
The following must be observed for Germany: "At the end of disinfection, the
entire system must be flushed at all tapping points until the concentration of
the disinfectant at all tapping points measured at the transition point (usually
the water meter) is reached or dropped below again.
To be observed for disposal: "If the water used for disinfection of an installation
is to be drained into a drain pipe or sewer, the responsible department must
be informed and the water may only be drained when the responsible depart-
ment has granted its permission." "Because of the rapid decomposition, the
disposal of hydrogen peroxide by draining into the sewer system is unproblem-
atical."
A maximum line length of 100 m is specified for flushing sections in the European
standard EN 806-4:2010 and in the information leaflet "Flushing, Disinfection
and Commissioning of Drinking Water Installations" (August 2014) of the German
Central Association for Sanitary, Heating and Air Conditioning (ZVSHK). For
this length a volume of approx. 20 l is required for a ½" galvanised steel pipe
and a volume of approx. 100 l disinfectant for a 1 ¼" pipe (see Fig. 6: Volume
in l/m of different pipes).
Depending on the volume of the individual pipe sections, several pipe sections
can be disinfected with one bottle of REMS Peroxi Color dosing solution (see
Accessories 1.2. Article Numbers). However, it is recommended not to use an
opened bottle for longer than one day because the dosing solution loses in
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O), flushing time (t H O), used water
2 2
O
2 2