Install Instructions

IM-MP 724992 0117
13
3.6.9 Pipe hangers
Hangers and supports must conform to the
requirements of ANSI/MSS SP 58, Pipe Hangers
and Supports, Materials, Design, Manufacture,
Selection, Application and Installation. Supports,
hangers and anchors are to be installed in a
manner that does not interfere with the free
expansion and contraction of the piping.
All parts of the support equipment need to be
designed and installed to not disengage due to
movement of the supported piping. Sliding hangers
must be positioned so that they cannot unintentionally
become rigid hangers when the system is in use. See
Fig. 3.8. Fig. 3.9 shows a sliding piping hanger that
becomes a rigid hanger with spacing in excess of 10".
Pipe Size
(in)
Steel Pipe Max. Span
(ft)
Min. Rod Diameter
(in)
½ - ¾ 6 ⅜
1 8 ⅜
1¼ - 2 10 ⅜
Table 3.11 Hanger Spacing
3.7 Deflection
When pressing Viega MegaPress fittings in a system,
the deformation of the fitting is constant. This allows for
a consistent leak-free joint every time and is a result of
the pressing technique.
The pressing process can cause deflection (angular
misalignment) to occur. Deflection while pressing can be
minimized by utilizing the installation practices below.
1. Alternate the position of the press tool on each fitting
connection. An example would be placing the press tool
at the 3 o’clock position of the first press connection
and then alternating to the 9 o’clock position of the
press fitting on the second connection.
2. If deflection occurs while pressing a MegaPress
fitting, the deflection created in the piping connection
will cause the fitting to move toward the hinge of the
press jaw or ring being used. For MegaPress ½" to 1"
fittings, a press jaw is used to make the press. The
hinge of the press jaw is on the same side of the piping
system as the press gun and operator and will therefore
cause the fitting to deflect toward the press gun and
operator. To help with this type of deflection, the press
gun operator can slightly pull the pipe and fitting
connection toward himself to create a slight bow away
from the operator. As the press connection is made,
the deflection will realign the piping connection back
into a straight line. For 1¼" to 2" MegaPress fittings, a
press ring along with an actuator is used to make the
permanent connection. When the press ring is placed
on the fitting, the hinge of the press ring is away from
the installer. If deflection is to occur with this type of a
press, it will cause the fitting to deflect away from the
press gun and operator side of the piping system. To
help with this type of deflection, the press gun operator
can slightly push the pipe and fitting connection away
from himself to create a slight bow toward the operator.
As the press connection is made, the deflection will
realign the piping connection back into a straight line.
While deflection cannot be completely eliminated, it can
be minimized using this method.
As long as the pipe is properly prepped and marked
and the fitting is installed per MegaPress’ Product
Instructions, if there is any deflection present after
the installation of the fitting, the connection is
still acceptable and meets Viega’s manufacturing
specifications for proper installation and warranty.
Deflection of a press connection has no effect on the
integrity of the system and it can be pressure tested in
accordance to MegaPress product instructions.
3.8 Identification
All Viega MegaPress black iron piping systems
should be continuously marked in accordance with
ANSI A13.1 or as required by the local authority
having jurisdiction.
Figure 3.8 Spacing for sliding pipe hanger
Figure 3.9 Spacing for sliding pipe hanger