Checklist Forflushing To Din 1988 Part 2. Paragraph 11 - Rothenberger ROPULS Instrucciones De Uso

The compressed air, e.g. from bottles or compressors, must be provided in sufficient quantity
and hygienically perfect quality (oil-free). The min. air pressure must be above the 'static'
water pressure.
Depending on equipment size and piping layout, flushing must be in stages. The pipe length
per flushing stage should not exceed 100 m. The flushing should be directed upwards and
the sequence to be followed should be from the closest to the most distant train of pipes.
Each train gets flushed per floor from the bottom to the top. Within the piping of a floor, a
minimum number of taps as indicated in table 11, normally all of them, is opened one after
another, starting with the point furthest from the rising train.
Flushing time depends on pipe length and should not be under 15 seconds per running
meter. Flushing time per tap should be 2 minutes min. After having flushed the last point to
be opened for 2 minutes, the taps are closed again in the reverse order
The flushing effect is enhanced by simultaneously and periodically opening and closing the air
and water supply. Pressure impulses from fast opening and closing fittings e.g. ball valves,
have an advantage. For the manual operation of controls, standard values are
-
for the flow stage of a cycle – approx. 5 seconds
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for its stagnation stage – less than 2 seconds.
If the pressure impulse is given automatically, e.g. by a flushing appliance, cleaning may
possibly be done at a higher impulse frequency.
The design of the compressed air–water mixer and the respective fittings may follow fig. 24.
Compressed
air
Air-water
mixture
Fig. 24.
Compressed air / water mixing device (if the arrangement is manually without the use of a
flushing compressor).
To protect sensitive fittings and appliances (e.g. drinking water heater) against damage from
flushed-in solids, should such parts are installed only after the flushing and to first fit sleeve sock.
11.3 Preparation of initial operation and handing over
Whoever installs the equipment must prepare the handing over and acceptance reports.
Furthermore, the manufacturer must provide maintenance and operating manuals for the
installed protection and safety fittings and the appliances (also see DIN 1988, part 8.).
3.2

Checklist forflushing to DIN 1988 part 2. Paragraph 11.2

Technical prerequisites for flushing:
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Has it been connected to the public supply system? If not, may the flushing water be
drawn from a hydrant?
-
The water must running through a DIN/DVGW approved micro-filter.
-
All the installed water piping must be pressure tested befor fluhing.
-
For later checks of Rinsing quality, one or more control pieces should have been fitted.
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Cold and hot water pipes must be flushed separately.
22
Fittings for simultaneous
fast opening and closing
ENGLISH