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8.3 Storage
●
Ducts made from PE can only be stored for
limited periods if left in direct sunlight.
●
Experience has shown that they can be
stored in the open for up to 2 years without
their strength characteristics being
affected.
●
If stored outside for longer periods or if
stored in areas with high levels of direct
sunlight, storage offering protection from
the sun will be needed.
●
Contact with harmful media (see
supplementary sheet 1 for DIN 8075)
should be avoided.
●
Bundled coils should be stored horizontally
and not on top of one another. If stored in
this way, it is essential that the ground
under them is free from stones.
●
If bundled coils are stored vertically, these
must be secured to prevent them from
falling over (risk of accident).
●
The ducts should be stored such that their
insides cannot be dirtied. Shutters should
therefore only be removed upon
installation.
8.4 Special points relating to working
with bundled coils
●
When unwinding bundled coils, note that
the ducts may shoot off like springs when
the attachment is loosened (risk of
accident).
●
Since considerable forces are released
when working with larger diameters,
proceed with care.
8.5 Checking the ducts
●
Before fitting, check the ducts for damage
incurred during transport and storage.
●
Ducts with sharp-edged damage or with
scoring and scratches of a depth of more
than 10 % of the wall thickness must not be
fitted.
8.6 Mechanical connections
(compression connections)
●
Ducts made from PE can be quickly and
securely connected using metal or plastic
compression fittings.
●
Only fittings which satisfy the requirements
stated in DIN 8076 and DVGW VP 600
may be used for the installation work.
●
The guidelines of the relevant manufacturer
must be noted when installing other
compression fittings.
8.7 Pressure testing
●
Before being commissioned, the ducts
must be subject to internal pressure testing
in accordance with DIN EN 805 or the
DVGW process sheet W400-2.
●
Pressure tests should be conducted by
specialist staff who have the relevant
knowledge of duct technology, conducting
pressure tests, measurement technology
and the safety regulations.
