Sime Murelle EV HE 30 Instructions D'installation Et D'utilisation page 14

5. Support and Restraint Spacing
ENG
(a) General Principles of Support Adequate sup-
FR
port for any piping system is a matter of great
importance. In practice, support spacing is a
function of pipe size, operating temperatures,
the location of fittings and the mechanical pro-
perties of the pipe material. To ensure satisfac-
tory operation of a thermoplastic piping system,
the location and type of hangers should be care-
fully considered. The principles of design for steel
piping systems are generally applicable to ther-
moplastic piping systems, but with some notable
areas where special consideration should be
exercised.
1.In systems where large fluctuations in tempe-
rature occur, allowance must be made for
expansion and contraction of the piping
system. Since changes in direction in the
system are usually sufficient to allow expan-
sion and contraction, hangers must be placed
so movement is not restricted. (See also
Expansion-Contraction section of this manual).
2. Changes in direction (e.g. 90° elbows) should
be supported as close as practical to the fit-
ting to avoid introducing excessive torsional
stresses into the system.
3. Supports to be used on System 636 pipe shall
be suitable for use on plastic pipe and shall not
be tightly clamped 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 vertically at a maxi-
mum of every 5 feet (1.5 mt). This maximum
recommendation should always be referen-
ced against local regulatory codes, the local
authority having jurisdiction, as well as the
appliance manufacturer. The most restrictive
requirement shall apply. Do not strap vertical
14
vent pipe too tightly. Strapping must support
the vent system while still permitting the vent
to move in the event of expansion and con-
traction.
(c) In order to adequately support the weight of
vertical vent pipe, a pipe anchor or support
shall be installed at the first floor penetration
and then every 2 storeys thereafter as requi-
red. Securely fasten pipe anchors or supports
to the building structure. Pipe anchors or sup-
ports used for this purpose shall be suitable
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 addition to
the required pipe straps which are intended
only to maintain the position of the vertical
vent while allowing for expansion and contrac-
tion. Make certain that allowance for expan-
sion 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 requirements.
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 structu-
re (e.g. floor joists or cross members) 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 contraction of the venting
system.
In certain conditions greater clearance than
25mm (1") may be required between System
636 venting and supporting structure.
Always check the tables in this instruction
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 temperatures. Although the
rates of expansion/contraction are approxi-
mately 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 following tables.
(b) To accommodate any expansion/contraction
movement and stresses that may occur, IPEX
suggests giving consideration 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 horizontal
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 applian-
ce 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.