Viega Megapress, Installation Manual

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3.4 Welding, soldering or brazing
requirements
3.4.1 Viega ProPress to existing brazed fitting
Minimum clearance requirement when pressing
connections near an existing brazed connection
is two pipe diameters.
3.4.2 Viega ProPress to existing solder fitting
To ensure proper sealing of both the soldered and
press connections, a minimum spacing between
connections must be maintained. Refer to Table 3.3.
Note:
Ensure there is no residual solder or other
foreign debris on the tubing to be inserted into the
Viega ProPress fitting.
3.4.3 Soldering or brazing near an existing
Viega ProPress fitting
To ensure proper sealing of the soldered/brazed
joint and the press connection, a minimum distance
between connections must be maintained.
When soldering near a Viega ProPress connection,
the installer must remain at least three tube
diameters away from the connection to prevent
damage to the sealing element. When brazing, the
installer must remain at least nine tube diameters
away from the connection. Refer to Table 3.4.
The installer should take precautions to keep the
Viega ProPress connection cool. These include:
• Wrapping the connection with a cold wet rag
• Fabricating solder connections prior to
installing the press fitting, making sure the
tube has cooled before installing the fitting
• Applying “spray type” spot freezing
It is particularly important to ensure the tubing
inserted into the Viega ProPress fitting and the Viega
ProPress fitting are not exposed to excessive heat.
Minimum
Distance
Tube
Diameter
Minimum Distance
inch mm
½" ¼ 7
¾" ¼ 7
1"
7
⁄
16
11
1¼"
7
⁄
16
11
1½"
⅝ 16
2" ¾ 19
2½" ¼ 7
3" ¼ 7
4
"
¼ 7
Table 3.3
Tube
Diameter
Soldering Brazing
Minimum Distance Minimum Distance
inch mm inch mm
½" 1½ 38 4½ 114
¾" 2¼ 57 6¾ 172
1" 3 76 9 229
1¼" 3¾ 95 11¼ 286
1½" 4½ 114 13½ 343
2" 6 153 18 457
2½" 7½ 191 22½ 572
3" 9 229 27 686
4" 12 305 36 915
Table 3.4
3.4.4 Welding adjacent to a Viega ProPress
fitting
When welding pipe adjacent to pipe joined with a
Viega ProPress fitting, installers must weld 4" away
from the Viega ProPress connection to protect the
sealing element. Precautions installers can take to
keep the Viega ProPress connection cool include:
• Wrapping the connection with a cold wet rag
• Protecting the connection with a weld blanket
• Prefabricating welded connections prior to
installing the pressed fitting
• Making sure the pipe has cooled before
installing the fitting
• Consistently applying “spray type” spot
freezing
3.4.5 Welding in line with a Viega ProPress fitting
When welding on the same pipe as a Viega ProPress
fitting, installers must weld at least three feet away
from the Viega ProPress connection to protect the
sealing element. If three feet is not possible, installers
should follow the precautions listed above to keep
the Viega ProPress connection cool.