PEX Installation Manual

43
IM-PF 724596 0416
15.1 Handling ViegaPEX Ultratubing
The properties of ViegaPEX Ultra tubing make it easy
to work with and install in most types of construction.
Some care must be taken to prevent damage to the
tubing before and during installation:
• Use care to protect both ViegaPEX Ultra and
FostaPEX tubing from physical damage during
storage and installation. Keep the tubing away from
sharp objects, open ames, etc., and do not place
heavy objects on the tubing.
• Damaged sections of tubing should be cut out
and discarded.
• Do not expose ViegaPEX Ultra tubing to
sunlight or any UV source for extended
periods of time exceeding six months.
• FostaPEX, with its aluminum layer, is resistant to UV
light, but long-term exposure should still be avoided.
• Do not store ViegaPEX Ultra or FostaPEX tubing
outdoors where it may be exposed to UV light.
15.2 Uncoiling ViegaPEX Ultratubing
An uncoiler should be used to preventtwisting when
removing tubing from ⅜" to 1" coils. Roll coils out and
use care to avoid twisting 1¼", 1½" and 2" coils or
when an uncoiler is unavailable.
15.3 Bending ViegaPEX Ultra tubing
ViegaPEX Ultra tubing can be free bent (unsupported
bend) to a minimum radius of eight times the tubing
O.D. and ve times the tubing O.D. with the use of
a Viega-approved bend support. FostaPEX tubing
can be free bent to a minimum radius of eight times
the tubing O.D. and 3.5 times the tubing O.D. with the
use of a Viega tubing bender. For situations requiring
tighter bends, use elbow ttings. If bending against
a PEX coil bend direction, the bending radius is 24
times the tubing O.D. Viega does not allow the practice
of “hot bending” ViegaPEX Ultra tubing to make a
tighter bend radius.
Tubing size Maximum distance from fitting to bend
⅜" PEX L = 6 inches
½" PEX L = 8 inches
¾" PEX L = 10 inches
1" PEX L = 12 inches
1¼" PEX L = 14 inches
1½" PEX L = 16 inches
2" PEX L = 18 inches
L
Using a tubing fastener
near a connection
to support bend and
reducestress on fitting
L
Using a bend support
near a Viega PEX
connection to reduce
stress on fitting
OD
Bend
Radius
R
Minimum bending radius
for ViegaPEX Ultra
tubing
To reduce damaging stress on Viega PEX ttings,
bend supports or tubing fasteners must be used
to anchor all bends made close to ttings. Support
must be provided for tubing bends located closer
to ttings than distance “L” in table below. (See the
diagrams below for typical installation examples.) Since
FostaPEX will maintain its shape once bent, supports
may not be necessary. However, support must be used
at the “L” distance while making the bend.
15 Installing the ViegaPEX Ultra Tubing System
ViegaPEX Ultra Minimum Radius
Nominal Size*
Free Bend
(8 x O.D.)
Supported
(5 x O.D.)
⅜" 4" 2.5"
½" 5" 3.1"
¾" 7" 4.4"
1" 9" 5.6"
1¼" 11" 6.75"
1½" 13" 8.1"
2" 17" 10.6"
*ViegaPEX Ultra bend radius values were calculated
using standard CTS O.D. dimensions, which are ⅛" larger
than the nominal tube size listed.
FostaPEX Minimum Radius
Nominal Size**
Free Bend
(8 x O.D.)
Supported
(3.5 x O.D.)
½" 5.6" 2.4"
¾" 7.5" 3.3"
1" 9.6" 4.2"
** FostaPEX bend radius values were calculated using
the actual O.D. dimensions, which include the additional
aluminum and PE layers.