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Pipe Welding
PP-R pipes and fittings should be connected through thermal melting or electric melting, relevant set of welding machine or tool is supplied by us. Pipe installation and operation must comply with relevant
technology regulation and usage requirement for welding machine and tool.
Techno-Flex Plus PP-R pipe can't directly be connected to sanitary ware, metal pipe and fittings, valve, relevant
accessory, but via PP-R metal threaded fittings or flange.
Welding key points
Cut the end part of pipe at right angle to pipe axis with pipe cutter, take care that pipe axis is free from
burrs or cutting chips and remove if necessary.
Don't start operation until green light is on.
Welding parts of pipes and fittings must be kept dry, cleanness, no oil.
Marking welding depth at end of pipe and fittings with proper pen and measure in accordance with
following table.
After stipulates the heating time, quickly remove pipe and fitting from welding die, joining them immediately
with average and without turning until the marked depth is bead of PP-R from the fitting.
Joint element have to be fixed during the specified assembly time . Use this time to correct the connection.
The connection is only restricted to the alignment of pipe and fitting. Never turn the elements or align the
connection after the processing time.
 Table Processing Time
| Dimension |
Welding Depth |
Heating Time
(s) |
Welding Time
(s) |
Cooling Time
(min) |
16 |
13.0 |
5 |
4 |
2 |
20 |
14.0 |
5 |
4 |
2 |
25 |
15.0 |
7 |
4 |
2 |
32 |
16.5 |
8 |
6 |
4 |
40 |
18.0 |
12 |
6 |
4 |
50 |
20.0 |
18 |
6 |
4 |
63 |
24.0 |
24 |
8 |
6 |
75 |
26.0 |
30 |
8 |
8 |
90 |
29.0 |
40 |
8 |
8 |
110 |
32.5 |
50 |
10 |
8 |
160 |
55.0 |
60 |
15 |
10 |
Welding in Saddle
Weld in saddles are used for
weld in saddles are available for pipe outer
diameters of 40, 50, 63, 75, 90 and 110 mm.
branch connections in existing installations
the substitution of a tee
branch connections in risers
sensor installation, etc.
- Before the welding process, check weather the welding devices and tools meet the requirements of
welding.
- The first step is to drill through the wall of the pipe at the point intended for the outlet using the drill.
- When using -stabi composite pipes remove the rest of the aluminium remaining at the bore hole.
- The welding device/saddle welding tool must have reached the required operating temperature of 260 C.
- The welding surfaces have to be clean and dry.
- Insert the heating nozzle on the concave side of the weld in saddle tool into the hole drilled in the side wall
of the pipe until the tool is completely in contact with the outer wall of the pipe.At the same time the welding
in saddle nozzle is inserted into the heating sleeve until the saddle surface is up against the convex side of
the welding tool. The heating time of the elements is generally 30 seconds.
- After the welding tool has been removed, the weld in saddle nozzle is immediately inserted into the heated,
drilled hole. The weld in saddle should then be pressed on the pipe for about 15 seconds. After being allowed
to cool for 10 minutes the connection can be exposed to its full loading. The appropriate branch pipe is fitted
into the sleeve on the dismy weld in saddle using conventional welding technology.
Electrical Welding
-
Keeping the welding surfaces of pipe and electric sockets clean and dry.
- Cut the ends of the pipe to be welded at right angles to the pipe axis.
- To adjust the peeling depth unscrew the grub screw on the peeling tool.
- The machine, tool and pipe and fitting for electrical welding should comply with electrical welding technique
requirement.
- Joint element have to be fixed during the specified assembly time . Use this time to correct the connection.
The connection is only restricted to the alignment of pipe and fitting. Never turn the elements or align the the
connection after the processing time.
- Standard time of electrical welding is determined by the manufacturer and need be ajusted at different working
temperature.
- Electrical welding process will be finished, when melted material flows out of the signal hole.
Flange Conection
- Mental flange will be mounted on pp-r flange socket.
- The flange socket and pipe and fitting for electrical welding should comply with electrical welding technique
requirement.
- Ensuring two fanges socket to have right angle to pipe axis.
- Flange gasket should be non-toxic and heating resistance.
- Same nuts is at same direction and symmtry, zinc plated header of screw should be used.
- Length of pipe should be accurate and doesn't make elongation power during fastening screw down.
- A hanger should set up for flange connection.
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