Install Instructions

Viega IM-MTL 0612
724607
33
15.1 Fittings
Viega ProPressG Fittings are
currently offered in more than 120
fitting configurations. ProPressG
fittings are manufactured in copper
and bronze and are available in sizes
ranging from 1/2"to 2". Every fitting
is provided with a factory installed
HNBR sealing element. In addition,
all fittings include our patented Smart
Connect feature.
Fitting Benefits:
• Smart Connect feature
• Precise tolerances
• Integral stop for insertion depth
• Factory installed sealing element
Since ProPressG fittings are
available in sizes 1/2" – 2",
ProPressG can be used in a wide
variety of residential and commercial
fuel gas piping applications. The
tubing and the ProPressG fittings are
rated for 125 psi fuel gas pressure.
Because of this rating, the material
can be used for low pressure, 0.5 psi,
to very high pressure, 125 psi.
In commercial construction it is
common to have 2 psi gas in a
building running to appliances.
This reduces the size of the copper
tubing required for fuel gas
piping systems.
Each fitting is marked with the
following:
• Viega
• The fitting dimension
• CSA logo and max pressure
15.2 HNBR Sealing Element
Every ProPressG fitting includes a
factory installed HNBR sealing
element. HNBR stands for
Hydrogenated Nitrile Butadiene
Rubber, which is yellow in color.
This sealing element is used mainly
for applications of natural gas,
propane, mixed and manufactured
gases in the vapor state, not in the
liquid state. It is also commonly
used in fuel oil heating systems.
The operating temperature for HNBR
is -40°F to 180°F. It is known for
its physical strength and retention
of properties after long-term
exposure to heat, oil and chemicals.
The unique properties attributed
to HNBR have resulted in wide
adoption of HNBR in automotive,
industrial and assorted performance-
demanding applications. With its
excellent performance for the most
demanding of applications, HNBR
is the ideal choice for applications
needing excellent physical
properties, as well as oil, heat and/or
chemical resistance.
15. PRODUCT DESCRIPTION
The HNBR sealing element is not
suitable for food contact or drinking
water applications.
15.3 Copper Tubing
ProPressG fuel gas installations can
be made with seamless, corrosion
resistant drawn copper tubing.
These tubes must comply with the
requirements of ASTM B88.
Table 15.3 identifies the different
types of copper tube allowable
for use in ProPressG fuel gas
distribution systems, as well as
the identification and availability of
each type. Types K and L copper
tube (ASTM B 88) have been used
in fuel gas systems for many years.
Type L is typically used for interior
distribution systems and type K for
any underground lines.
The dimensions of copper tube used
for gas installations are shown in
Table 15.3. Tube and fittings in fuel
gas systems are usually identified by
their outside diameter (O.D.) rather
than their nominal sizes.
Table 15.2: ProPressG product line general overview
Elbows
Used to change direction 45° and 90°
Threaded Adapters
Used to connect other piping
materials and system components
(i.e. meters, valves, etc.)
Tees
Used for branch piping connections
Couplings and reducing couplings
Used for connecting tubing and
reducing tubing diameter