Install Instructions

Installing the Viega PureFlow PEX Tubing System
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IM-PF 724596 1021 PureFlow Water System (EN)
11.3 Bending PureFlow PEX Tubing
Viega PureFlow PEX 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. 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”
Viega PureFlow PEX tubing to make a tighter bend radius.
Viega PureFlow PEX 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"
*Viega PureFlow PEX bend radius values were calculated using standard CTS O.D. dimensions,
which are ⅛" larger than the nominal tube size listed.
To reduce damaging stress on Viega PureFlow 󶈵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 to the left for typical
installation examples).
Tubing Size Maximum distance from 󶈵tting 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
OD
Bend
Radius
R
Minimum bending
radius for Viega
PureFlow PEX tubing
L
Using a bend
support near a
Viega PureFlow
connection to
reduce stress on
󶈵tting
L
Using a tubing
fastener near a
connection to
support bend and
reduce stress on
󶈵tting