Install Instructions

IM-MP 724992 0117
8
3 General Installation Instructions
3.1 Pipe selection
Viega MegaPress ½" to 2" fittings are compatible
with ASTM A53, A135, A106 and A795 black iron
pipe.
3.2 Handling instructions
Viega MegaPress components shall be free from
dirt, debris or items that may interfere with the
sealing element and the press connection. Pipe
shall be cut using a pipe cutter or metal saw.
It is not acceptable to cut the pipe with an
abrasive cutting wheel or torch.
3.3 Pipe preparation
In general there are three pipe types typically used in
black iron pipe applications:
Painted black iron pipe
Painted black iron pipe shall be inspected for
excessive paint runs. Excessive paint runs shall be
smoothed using a fine-grit sandpaper or the Viega
MegaPress Pipe Prep tool.
Painted and lacquered black iron pipe
Due to the inconsistency of black iron pipe surfaces
that are painted and lacquered, it is a requirement to
smooth the pipe surface using a fine-grit sandpaper
or the Viega MegaPress Pipe Prep tool.
Epoxy coated black iron pipe
Due to the thickness of the coating applied to coated
black iron pipe, it is necessary to reduce the coating
thickness with a fine-grit sandpaper to allow the
installation of the Viega MegaPress fitting.
Pipe surfaces for each type of pipe must be
smooth, free of indentations, pits and deformations
and must be clean and free of debris, rust, scale,
oil and grease.
It is not necessary to completely remove protective
coatings or to expose the bare steel material.
Pipe ends are to be square and de-burred internally
and externally. The pipe end shall be prepped to the
proper insertion depth. See Table 3.1.
To avoid leak paths, engraved or stamped pipe shall
not be used with the Viega MegaPress fitting system.
Engraving or stamping shall not be removed through
use of a grinder or other tool.
Viega MegaPress sealing elements, separator rings
and grip rings are to be visually inspected prior to
installation to ensure the seal is intact and properly
located within the fitting. See “1.3 Fitting description”
on Page 4 for more information. Viega MegaPress
sealing elements may not be removed or replaced.
The Viega MegaPress system does not require
lubrication of the pipe or the fitting. Proper insertion
depth must be marked on the pipe. Refer to Table
3.1. Improper insertion depth may result in an
improper seal. The depth marking shall be visible
on the completed assembly.
3.3.1 No-stop couplings
No-stop couplings and extended no-stop couplings are
often used to conduct repairs. Without a stop, these
couplings can slide completely onto a pipe and allow a
connection to be made in tighter spaces. Unlike fittings
with an integrated stop that have a minimum insertion
depth, no-stop couplings have minimum and maximum
allowable insertion depths. Both the minimum and the
maximum insertion depths must be marked and a line
connecting the two marks. Drawing a line between the
minimum and maximum insertion marks distinguishes
a good connection on a no-stop fitting from a bad
connection on a fitting with a stop.
Pipe Size Insertion Depth
in mm
½" 1
1
⁄
16
27.2
¾" 1
3
⁄
16
29.4
1" 1⅜ 34.2
1¼" 1
13
⁄
16
46.2
1½" 1⅞ 47.5
2" 2 50
Table 3.1
Viega MegaPress No-Stop Couplings
Pipe Diameter Minimum
Insertion
Maximum
Insertion
in mm in mm
½" 1
1
/
16
" 27.2 1⅝" 41
¾" 1
3
/
16
" 29.4 1
13
/
16
" 46
1" 1⅜" 34.2 1
15
/
16
" 49
1¼" 1
13
⁄
16
" 46.2 2½" 63
1½" 1⅞" 47.5 2¾" 70
2" 2" 50 2¾" 70
Viega MegaPress Extended No-Stop Couplings
Pipe Diameter Minimum
Insertion
Maximum
Insertion
in mm in mm
½" 1
1
/
16
" 27.2 2¾" 70
¾" 1
3
/
16
" 29.4 2
13
/
16
" 72
1" 1⅜" 34.2 3" 77
1¼" 1
13
⁄
16
" 46.2 3
½
" 89
1½" 1⅞" 47.5 3
9
/
16
" 91
2" 2" 50 3
11
/
16
" 93
Table 3.2
Table 3.3