Tímarit Verkfræðingafélags Íslands - 01.05.1947, Blaðsíða 19

TÍMARIT V.F.l. 1947
41
being loose enough to permit expansion between the
bends.
Although the concrete channels are not exposed
to such great temperature changes as the pipes, they
are made to stand some thermal expansion, thus pre-
venting cracks. Expansion gaps packed with bitumen,
tarred paper, and hamp function as such.
In the lowest part of the town where the channels
are in places submerged in ground water, which may
even be salty, the expansion gaps have to be still
better packed. There corrugated sheets af lead or
copper are used as packing material. These sheets are
soldered together as to form a solid joint. The
channel itself being reinforced between the gaps.
In the urban system there is a great number of
valves and expansion joints besides air'and drain
valves as in the main line. Around all these concrete
boxes are made, thus constructed as to make these
devices easily accessible.
Where the channels slope towards a box, a drain
from the box leads to the urban sewerage. Traps in
the drain prevents vapor from the sewerage from
entering the box.
In the middle of the town drains as these mentioned
are not possible due to the low altitude; here a sump
in the bottom of the box takes care of the drainage.
These are emptied whenever neseccary.
Boxes resembling these here described are also
on the main line. The boxes are of different sizes;
the largest being 7.8 x 3.3 X 2 meters.
Close to the connection of a house-line to a street-
line is a valve on the house-line. Thus each house-line
can be closed, f. i. in case of repairs. Around these
valves and the tombak pipes, previously mentioned,
boxes are made having a movable concrete lid, the
packing between channel walls and the lid being of
hamp.
Indoor arrangement.
The house-lines are connected stright to the central
heating system of the houses close to the boiler. (The
houses were previously heated by central heating
system using coal burners). In the indoor line is insert-
ed a valve just inside the wall, and on the other end,
near the boiler, a control valve with a lock shield,
operated by the officials of the municipal heating
system, which gives the house the required amount
of water when the pressure in the street-line is a
minimum.
Besides, there is inserted a flow-meter, a control
valve with hand wheel used by the house for dayly
regulating of flow and a check valve.
Water for bathing and washing is taken from the
line before it enters the heating system.
From the end of the heating system, at the boiler, a
water outlet leads straight to the sewerage. The outlet
from the system would be better located above the
uppermost heating elements, thus preventing the
heating system from emptying. This however could
only be installed in some cases. Otherwise an outlet
valve, manually controlled, takes care of this.
This valve has to be closed when the inlet valve is
closed.
Cost.
The cost of the whole project amounted to 30
million kr.
The project has proved to be economically sound,
the annual income being 6 million kr.
The cost of water to the consumer is 1.36 kr. pr.
m" from May 14th to Oct. lst. but 0,68 kr. pr. m:i the
rest of the year. The savings for the individual con-
sumer compared with the cost of using coal amounts
to not less than 10%.
*
This project, The Reykjavík Hot Water Supply,
has proved advantagous. The undertaking is a pio-
neering in this field. Data on experience of similar in-
stallations was not available.
The project is to be enlarged and it certainly will
arouse enthusiasm for the use of natural hot water
as heating medium.
Verkfræðingar og Verkfræðingafélag Íslands.
Ræða flutt af Emil Jónssyni, samgöngumálaráðlierra á 35 ára afmæli V. F. í. 18. apríl 1947.
Mér er það mikil ánægja að segja hér nokkur orð
í tilefni af 35 ára afmæli V. F. í. Að vísu er það
nú svo, að ég kem verr undir það búinn en ég vildi.
Ég minnist í því sambandi þess, að þegar ég gekk
á polytekniska skólann í Kaupmannahöfn, voru þar
tvenns konar skoðanir uppi meðal okkar íslenzku
stúdentanna um það, hvernig taka bæri þeim verk-
efnum, sem fyrir lágu hverju sinni. Sumir vildu þá
reyna að skjóta öllu erfiði á frest sem lengst, eða
eins og það var orðað: aldrei gera í dag það, sem