Sime Planet Dewy 30 BFT Notice De Montage, D'utilisation Et D'entretien page 12

5. Support and Restraint Spacing
ENG
(a) General Principles of Support Adequate
FR
support for any piping system is a mat-
ter of great importance. In practice, sup-
port spacing is a function of pipe size,
operating temperatures, the location of
fittings and the mechanical properties of
the pipe material. To ensure satisfactory
operation of a thermoplastic piping
system, the location and type of hangers
should be carefully considered. The prin-
ciples of design for steel piping systems
are generally applicable to thermopla-
stic piping systems, but with some nota-
ble areas where special consideration
should be exercised.
1. In systems where large fluctuations in
temperature occur, allowance must
be made for expansion and contrac-
tion of the piping system. Since chan-
ges in direction in the system are
usually sufficient to allow expansion
and contraction, hangers must be pla-
ced so movement is not restricted.
(See also Expansion-Contraction sec-
tion of this manual).
2. Changes in direction (e.g. 90° elbows)
should be supported as close as prac-
tical to the fitting to avoid introducing
excessive torsional stresses into the
system.
3. Supports to be used on System 636
pipe shall be suitable for use on pla-
stic pipe and shall not be tightly clam-
ped onto the pipe to allow for possible
expansion/contraction movement.
Pipe clamps or hangers shall not have
sharp edges or fulcrum points which
might damage the System 636 pipe
over time.
(b) System 636 PVC and CPVC systems
must be supported horizontally and ver-
tically at a maximum of every 5 feet (1.5
mt). This maximum recommendation
should always be referenced against
local regulatory codes, the local autho-
rity having jurisdiction, as well as the
appliance manufacturer. The most
12
restrictive requirement shall apply. Do
not strap vertical vent pipe too tightly.
Strapping must support the vent system
while still permitting the vent to move in
the event of expansion and contraction.
(c) In order to adequately support the wei-
ght of vertical vent pipe, a pipe anchor or
support shall be installed at the first
floor penetration and then every 2 sto-
reys thereafter as required. Securely
fasten pipe anchors or supports to the
building structure. Pipe anchors or sup-
ports used for this purpose shall be sui-
table for use with plastic pipe. These
anchors or supports shall be snuggly
fastened to the vent in order to support
the weight of the vent, but shall not be
allowed to deform or damage the vent.
Anchors or supports supporting the wei-
ght of the vertical vent shall be in addi-
tion to the required pipe straps which
are intended only to maintain the posi-
tion of the vertical vent while allowing for
expansion and contraction. Make cer-
tain that allowance for expansion and
contraction is provided in all venting
installations.
(d) System 636 venting shall be supported
with steel strapping or equivalent.
Strapping shall meet the following requi-
rements.
1/2" (13 mm) strapping - 22 gauge
steel
3/4" (19 mm) strapping - 28 gauge
steel
3/4" (19 mm) galvanized strapping - 28
gauge steel.
Strapping shall be fixed to supporting
structure (e.g. floor joists or cross mem-
bers) using typical framing nails or
screws.
(e) System 636 pipe and fittings shall be
hung at least 25mm (1") away from any
supporting structure to allow for free
movement due to expansion and con-
traction of the venting system.
In certain conditions greater clearance
than 25mm (1") may be required
between System 636 venting and sup-
porting structure.
Always check the tables in this instruc-
tion manual to ensure adequate space is
provided to accommodate expansion
and contraction.
6. Expansion and Contraction
(a) Being a thermoplastic product, System
636 has a notable capacity to expand
and contract under fluctuating tempera-
tures.
Although the rates of expansion/con-
traction are approximately 40% less
than that of ABS, installers must still be
aware of this physical property of
System 636 and plan to accommodate
it. Typical expansion vs. temperature
change values can be found in the fol-
lowing tables.
(b) To accommodate any expansion/con-
traction movement and stresses that
may occur, IPEX suggests giving consi-
deration to the following suggestions
during installation:
1. Leave adequate clearance between
any System 636 bends and walls or the
underside of floor boards or joists.
2. Use loose fitting clamps and hangers
to allow free pipe movement if required.
3. For long runs, consider using 2 hori-
zontal bends of the same angle to act as
an offset to absorb movement and
stresses (i.e. two 45's to replace one
90).
4. For critical areas such as near the
appliance outlet, two 45 bends may be
considered for use in lieu of one 90 bend
for more structural flexibility.
7. Firestops
Should System 636 pass through a fire
rated floor or wall, the penetration shall be
firestopped with a device or system listed
to ULC CAN4-S115 for an F and/or FT
Rating equivalent to the hour rating of the
floor of the wall.