Sime Planet Dewy 30 BFT Notice De Montage, D'utilisation Et D'entretien page 13

8. Solvent Cementing
(a) Gas Venting Applications Installation of
plastic pipe and fittings for gas venting
applications requires a higher degree of
skill than other installations; joint failures
in these systems could be life threate-
ning. It is for this reason we recommend
the following tips for these applications.
Tips for Installation:
• Installers should complete the IPEX
on-line solvent cementing
(www.ipexinc.com)
• Allow at least twice the normal set
and cure times.
• Installers should use extra precau-
tions during installation to insure proper
installation of system.
• The proper System 636 Cement
must be used. Do NOT substitute other
cements.
• If there is any doubt about compatibi-
lity of materials with a certain appliance
or application, the appliance manufactu-
rer should be contacted.
(b) Do not use solvents or cements other
than what is required by this guide. Only
IPEX's System 636 PVC/CPVC Primer
(purple or clear in color) shall be used
for System 636 PVC or CPVC venting
systems. Only System 636 PVC solvent
cement (grey in color) or System 636.
CPVC cement (orange in color) shall be
used to connect System 636 PVC pipe
and fittings. Only IPEX's System 636
CPVC solvent cement (orange in color)
shall be used to connect System 636
CPVC pipe and fittings.
(c) In instances where transitions between
material types is necessary, only System
636 Transition Cement shall be used for
connections to ABS. Only System 636
CPVC cement shall be used for transi-
tions between PVC and CPVC.
course (d) CPVC solvent cements must not be used
more than 2 years beyond the date of
manufacture printed on the container.
PVC solvent cements and all primers
must not be used more than 3 years
beyond the date of manufacture printed
on the container.
(e) Basic Principles of Solvent Cementing
To make consistently good joints, the fol-
lowing points should be clearly under-
stood.
1. The joining surfaces must be softe-
ned and made semi-fluid.
2. Sufficient cement must be applied to
fill the gap between pipe and fitting.
3. Assembly of pipe and fittings must be
made while the surfaces are still wet
and cement is still fluid.
4. Joint strength develops as the
cement dries. In the tight part of the
joint the surfaces will tend to fuse
together; in the loose part, the
cement will bond to both surfaces.
Penetration and softening can be achieved
by the cement itself, by using a suitable pri-
mer, or by the use of both primer and
cement. For certain materials and in cer-
tain situations, it is necessary to use a pri-
mer. A suitable primer will usually penetrate
and soften the surfaces more quickly than
cement alone. Additionally, the use of a pri-
mer can provide a safety factor for the
installer, for they can know under various
temperature conditions when they have
achieved sufficient softening. For example,
in cold weather more time and additional
applications may be required.
More than sufficient cement to fill the loose
part of the joint must be applied. Besides fil-
ling the gap, adequate cement layers will
penetrate the surfaces and also remain
wet until the joint is assembled.
If the cement coatings on the pipe and fit-
tings are wet and fluid when assembly takes
place, they will tend to flow together and
become one cement layer. Also, if the
cement is wet, the surfaces beneath them
will still be soft and these softened surfaces
in the tight part of the joint will tend to fuse
together. As the solvent dissipates, the
cement layer and the softened surfaces will
harden with a corresponding increase in
joint strength.
In the tight (fused) part of the joint, strength
will develop more quickly than in the looser
ENG
FR
13