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6.
Assembly above ground
When installing the tanks above ground it is important to ensure that they are completely emptied when
there is any danger of frost. Furthermore, the tanks must be installed on an appropriate level and
compacted surface that is free from sharp objects and stones. Notice must be taken when installing the
tanks that the total weight when filled will be 1,350 kg. The tanks should also be installed in a shaded
area. When the tanks are to be installed in a closed room, it is necessary to ensure that there is a floor
drainage system on hand. The tanks are not designed to work under pressure and therefore it is
important to ensure that the overflow outlet has the same diameter as the inlet.
6.1
Joining multiple vessels
The coupling of two or more tanks is achieved by means of assembly areas moulded into the bases of the
tanks using GRAF special seals and canalisation pipes. The openings are only to be undertaken with the
special GRAF core drills (hole saw) in the appropriate sizes. It is important to note that the distance
between the tanks is a minimum of 10 cm. The pipes must extend into the tank at least 20 cm. If more
than two tanks are to be connected to one another then in addition to the lower connection (inlet) there
must also be an upper connection to ensure ventilation.
6.2
Laying connections
The connection of the inlet and overflow is by means of the pre-drilled openings of the tank or by means
of the pre-molded connection points intended for opening.
All the suction and pressure control lines must be installed and connected
above
the maximum water
level.
7.
Service and maintenance
The system as a whole has to be checked for leaks, cleanliness, and stability at least every three months.
The system as a whole should be maintained every 5 years. In doing so, all system components have to
be cleaned and checked for functionality. Maintenance works should be conducted as follows:
•
empty tank completely
•
remove immovable residua using a pressure washer through the tank head
•
remove all contaminations from the tank
•
check all installation parts for proper seat
Otto Graf GmbH – Carl-Zeiss-Str. 2-6 – D-79331 Teningen – Tel.: 0049/(0)7641/589-0 – Fax: 0049/(0)7641/589-50
GRAF SARL – 45, Route d´Ernolsheim – F-67120 Dachstein Gare – Tel.: 0033/388497310 – Fax: 0033/388493280
GRAF Iberica – C/Marquès de Caldes de Montbui, 114 baixos – ES-17003 Girona – Tel.: 0034/872032283 – Fax: 0034/872032284
GRAF Ltd – Maidstone, Kent – UK-ME16 8Ry – Phone: +44 (0) 16 22 68 65 50
Status: May 2009
