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How to install PPR pipe? Hot melting connection
May 17, 2016

Basic principle

Hot Melting connection: put the pipe and fitting surfaces in the welding die and heat for a few seconds at the same time without rotating. Then remove the welding device quickly. Insert the heated tube into fitting quickly and vertically, Then keep it packing and cooling. So that the outer surface of the pipe and the inner surface of the fitting are melted separately. After cooling a certain time, it will form a strong, permanent and leak-proof interface to achieve the purpose of welding.

connection processes

Check----cut-----clean and mark----heat-----move welding machine----alignment---connect pipe and fittings---packing and cooling


1.The requirements and operate methods of checking, cutting, cleaning are similar with the former. But it requires the outside diameter of the tube should be bigger than the inner diameter of the fittings, to ensure proper formation of the flange after welding.

2 .Heating: put the pipe and fitting surfaces in the welding die (previously preheat) and heat for a few seconds at the same time. The heating temperature is 260 degrees. The welding time table as following list 5.1


Technical requirements for welding  5.1


Nominal diameter

 (mm)

Depth of welding (mm)

Heating time

 (s)

Processing time (s)

Cooling time

 (min)

20

14

5

4

3

25

16

7

4

3

32

20

8

4

4

40

21

12

6

4

50

22.5

18

6

5

63

24

24

6

6

75

26

30

10

8

90

32

40

10

8

110

38.5

50

15

10



Note: The heating time table should be adjusted according to the equipment instructions and the environment temperature of operation. If the ambient temperature is less than 5 ,the heating time should be extended 50%.

3.Connect:heat for a certain time, remove pipe and fitting from the welding die immediately. Then please quickly align the position and set the fitting into the pipe to the dash-line position. if found to skew It should be promptly corrected if you find it is askew when connecting.

4 .Packing and cooling: Please don’t move the pipes and fittings when it’s cooling. After it is totally cooled, then you can have next operation of another fitting.

 

Notes when welding

1, pipe and fittings should be cleaned before welding.

2, Keep pipe and fittings in the welding die for at least 5 seconds.

3, excessive heating would make the wall thickness of pipes and fittings be thinner.And pipe is easy to be deformed inside the fittings, then it will cause water leakage.

4, hot-melt automatic welding machine using instruction:

5, Fix the welding die and install the heating part. then place the machine on the shelf. install the corresponding heating pipe die according to the required specifications, and pull tight with a hexagon spanner. Generally, the small one is in the front,the big one on the end.

6, Supply Power ( the power supply must be protected with a ground wire). According to the corresponding specification of the machine, then pay attention to the change of indicator light until the welding die is at the working temperature state, then the operation can be started.

7,cutting pipe vertically by pipe cutter, put the pipe and fitting surfaces in the welding die and heat for a few seconds at the same time without rotating. And operate according to the requirements. Remove the pipe and fitting from the heating machine quickly at the same time. Then directly insert to the desired depth and make the joint evenly.

 

Hot melting is the most reliable, the easiest operation, air tightness and high seam strength connection method. PPR plastic pipe connection by a hand-held welding die to connect.


Before connecting, you should clean the plastic pipes and pipe accessories. When the red light of machine is on and stable, aligned the pipes or fittings that you want to connect. Melt depth of DN <50 is 1-2MM, melt depth of DN <110 is 2-4MM. When connect, please insert the tube end into the heating jacket and make it reaches a predetermined depth without rotation. At the same time, put the fittings on the heating part without rotation, when the heating time is over, remove the tube and pipe fittings from both heating jacket and heating head quickly without rotation. Then force it into the desired depth, so to form a uniform flange joints. Within a predetermined heating time, the joints can also be corrected when just welded, but it’s can’t be rotated. Excessive heating would make the wall thickness of pipes and fittings be thinner, and pipe is easy to be deformed inside the fittings, so it should be avoided over-heating. There shouldn’t be flame at the operation site, bright flame is prohibited to bake plastic pipe to be bend. Pull the heated plastic pipes and fittings lightly after vertical alignment, in order to prevent the elbow being curved. It must be gripped the tube and tube fittings for a certain time to keep cool before let it go.

 

It should be used with metal inserts PPR pipe as a transition in the connection of PPR plastic pipes with metal fittings. Such kind of fittings are connected with PPR pipe by welding, and by screws with metal fittings or sanitary hardware metal fittings.And it should adopt the polystyrene PTFE as the sealing filler. Such as the connection of taps in mop pool, it will be installed the female elbow at the end of the inner PPR plastic pipe . During the pipeline installation process, please don’t force too mush in order to avoid damaging the threaded fittings and result in leakage at the joints. Cutting plastic pipes also need specific cutter for pipes: pipe cutter blade bayonet should be adjusted to match the diameter of pipes, force evenly during the rotary cutting. After cutting, you need make the incision smooth. When cut the pipe, the incision should be perpendicular to the tube axis, and it should without glitches.



Find more information about ppr pipe: http://www.china-pvc-fitting.com



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