Install Instructions

IM-PR 566442 1114 (Design Manual)
134
Appendix A Tubing
Scope
This specication designates the requirements for
ViegaPEX Barrier cross-linked polyethylene (PEX)
tubing for use in hydronic heating and cooling
systems. ViegaPEX Barrier includes an oxygen
barrier layer that helps restrict the passage of
oxygen through the wall of the tubing. All ViegaPEX
is manufactured and tested to the requirements
of ASTM F876, F877, CSA B137.5 and is CTS-
OD (copper tube size outer dimension controlled)
with an SDR - (standard dimension ratio) 9 wall
thickness. ViegaPEX Barrier is compatible with
both ViegaPEX Press ttings and F1807 PEX Crimp
ttings. Viega has no control over the quality of
other manufacturers, therefore, we do not extend
any warranty to those components that are not
supplied by Viega.
Materials
ViegaPEX Barrier tubing is produced from cross-
linkable, high-density polyethylene resin. This
cross-linkable resin is produced by grafting organo-
silane molecules onto a base polyethylene chain.
A catalyst that initiates the cross-linking process
is blended with the resin before extrusion. Cross-
linking is conducted after extrustion by exposing
the tubing to heat and moisture (steam). ViegaPEX
Barrier includes four (4) layers. The rst layer
is cross-linked, high-density polyethylene. The
second layer is an adhesive for the third layer,
the ethylene vinyl alcohol layer (EVOH oxygen
barrier). The fourth layer is another thin layer of
polyethylene, applied on the outside to protect the
EVOH layer from damage. EVOH is highly resistant
to the passage of oxygen.
Property ASTM Test Method Typical Values
English Units SI Units
Density D 792 – 0.952 g/cc
Melt Index
1
D 1238 – 0.7g/10 min
Flexural Modulus
2
D 638 150,000 psi 1000 MN/m2
Tensile Strength @ Yield (2 in/min) D 638 3,900 psi 26 MN/m2
Coefcient of Linear Thermal Expansion @ 68°F D 696 9.2 x 10
-5
/°F 1.4 x 10
-4
/°C
Hydrostatic Design Basis @ 73°F (23°C) D 2837 1,250 psi 8.6 MPA
Hydrostatic Design Basis @ 180°F (82°C) D 2837 800 psi 5.5 MPA
Vicat Softening Point D 1525 255°F 124°C
Thermal Conductivity D 177 2.7 Btu/hr/ft
2
/°F 1.1 x 10
-3
cal/sec/cm/˚C
1. Before Cross-linking
2. 73°F
ViegaPEX Barrier Tubing
Marking and Certification
Tubing is marked with manufacturer, ViegaPEX
Barrier, nominal size, rating, codes and standards,
approvals, date, material code and location of
production (i.e., xxxxFT Viega ViegaPEX Barrier ½"
SDR-9 CTS PEX5306 100 PSI @ 180F [cNSF®us-
pw-rfh ASTM F876/F877 CSA B137.5] FS/SD 25/50
CAN/ULC S102.2 ICC ES-PMG™-1015/1038
HUD MR 1276 Date Code Material Code MADE
IN THE USA 0005FT. Tubing is third-party tested
to the requirements of the stated ASTM and CSA
standards. Tubing includes incremental footage
markings to assist with loop layout. ViegaPEX
Barrier tubing is certied to NSF 61 and 14 for use
as part of, or connected to, a potable water system.
Recommended Uses
Install ViegaPEX Barrier in accordance with
installation manuals provided by manufacturer
and applicable code requirements. Water or air
can be used to pressure test the system. Please
follow manufacturer's requirements on pressure
and length of time. ViegaPEX Barrier comes with
a 6-month UV protection. For information on the
suitablilty for other applications, contact your Viega
representative.
Handling and Installation
ViegaPEX Barrier tubing is recommended for
hydronic radiant heating, cooling and snow
melting systems using water or a water/glycol
mix as the heat transfer media. Tubing may be
installed in concrete, gypsum-based lightweight
concrete, sand, asphalt (in accordance with special
guidelines) in or under wood ooring or behind
wallboard or plaster. ViegaPEX Barrier may also
be used as transfer lines for baseboard heating
systems with a maximum operating temperature of
200˚F @ 80 psi.