We
undertake project for erection and commissioning for
our products. We are a team of experienced and qualified
Engineers. We have more than fifteen years of experience,
which help understand customer requirements as well
as adoption of modern traits. We are equipped with all
types of latest tools as well as skilled manpower. To
ensure best quality we have In-House Quality Control
Department, which follows the strict norms of the respective
standards for different products or as per customers’
specifications. We also offer third party inspection
for our manufactured products. Your satisfaction is
our Motto. |
| WELDING
& JOINING: |
| Sangir Plastics uses various sophisticated
methods to join plastic at fabrication shop and site.
The thermoplastics can be joined either by welding, fusion
or cementing while thermosetting/FRP can be joined by
lamination. |
| Methods |
MATERIALS |
| |
PP |
PVC |
CPVC |
PVDF |
HDPE |
| Hot air welding |
R |
R |
R |
R |
R |
| Solvent cementing |
NR |
R |
R |
NR |
NR |
| Socket/Butt fusion |
R |
NR |
NR |
R |
R |
| NOTE: R:
Methods Recommended; NR: Methods NOT recommended.
|
|
| Since the type and caliber of tools
used for jointing in various methods are as important
for high output, as maintaining excellent quality SANGIR
PLASTIC has done in-depth study over a period of time
in developing new sophisticated and automated tools. |
Top |
| HOT
AIR/GAS WELDING: |
With hot gas welding the edge areas
and the outer zones of the filler materials are transformed
into plastic conditions as a rule means of heated air
and joined under pressure. The gas is being made free
of water, dust and oil by fixing filters.
The filler or welding rods are available from 2 to 6 mm
dia. Two types of welding nozzles can be employed viz
fixed nozzle for rods of fixed length & running nozzle
for continuous long bundle of rod. Temperature required
for different material is controlled by thermostat. Air
required will be supplied through compressor. |
| Material |
Welding force (N) with welding rod
of dia. |
Hot air temp. oC |
Air quantity V/Min. |
| |
3mm |
4mm |
| PP |
10 to 16 |
25 to 35 |
280-330 |
40-60 |
| HDPE |
10 to 16 |
25 to 35 |
300-350 |
40-60 |
| PVC |
15 to 20 |
30 to 45 |
220-300 |
50-75 |
| CPVC |
20 to 30 |
30 to 45 |
310-350 |
60-70 |
|
| All the welders enganged in work
are periodically tested for weld strength test. Also all
welders are approved for the same test based on the test
carried out at IIT, Mumbai. |
|
Top |
| SOLVENT
JOINTING: |
| This method is employed only for
jointing pipe with socket type fitting i.e. where pipe
will be inserted into the fitting socket. Pipes &
socket type fittings are cleaned, debured and chamfered
to make it ready for cementing. Primer to be coated by
using brush on the areas to be joined i.e. outside of
pipe and inside of fitting till surface becomes tacky.
Solvent cement is applied on the tacky surface for bonding.
Then pipe will be inserted in fitting and both pieces
will be held under pressure till it gets bonded firmly.
At 25oC the handling time for cement is about 4 times
and completed joint to be held at approx. 10 minutes at
25 – 30oC. |
|
Top |
| SOCKET
FUSING JOINTING: |
| This method is used for jointing
pipe with socket type fitting only. Molded socket type
fittings are available up to 160m, diameter, so this method
is used for jointing pipes and fittings upto 160mm diameter.
Length of pipe which has to be inserted in fitting socket
for fusion to be peeled off in order to remove the glossiness
on pipe surface and to make it rough. For heating the
parts, firings to be inserted on heating spigot while
pipe to be inserted in heating bush. Values of time for
heating, change over time, jointing time cooling time
and pressure required etc. would be same as indicated
for butt fusion. Sangir PLASTICS uses fully automated
machine to do the fusion, cutting, peeling, chamfering
and deburring operations. |
| D |
T, Thickness in mm |
d1 |
l |
Heating time in sec. |
| 20 |
2.5 |
19.85-19.95 |
14 |
5 |
| 25 |
2.7 |
24.85.24.95 |
16 |
5 |
| 32 |
3.0 |
31.85-31.95 |
18 |
7 |
| 40 |
3.7 |
39.75-39.95 |
20 |
8 |
| 50 |
4.6 |
49.75-49.95 |
23 |
12 |
| 63 |
3.6 |
62.65-62.95 |
27 |
18 |
| 75 |
4.3 |
74.65-74.95 |
31 |
24 |
| 90 |
5.1 |
84.65-84.95 |
35 |
30 |
| 110 |
6.3 |
109.55-109.95 |
41 |
50 |
|
| Typical Sketch Showing Socket Fusion
Technique. |
|
Top |
| BUTT
FUSION JOINTING: |
| Fusion areas of pipes & fittings
are heated to fusion temp and jointed by means of mechanical
pressure without using filler rods. This is carried out
on butt fusion machine to maintain constant pressure,
uniform gap width and perpendicularity. This machine is
similar to socket fusion machine, only the heating elements
will be changed. |
| Values
Of Butt Fusion Jointing Process. |
| Pipe
wallthickness, mm |
Heating
element
temp., oC |
Equalization
at P=0.1N
/mm2 Height of bead, mm |
Heating time at P=0.01N/mm2 for various
materials, sec. |
Change over time,
sec. |
Time to reach full
jointing pressure, sec |
Cooling time under
jointing pressure P=0.15N
/mm2, sec. |
| 2-3.7 |
215 |
0.5 |
- |
30-40 |
40-70 |
4 |
3-6 |
4-5 |
| 4.3-6.9 |
210 |
0.5 |
65-115 |
40-70 |
70-90 |
5 |
5-8 |
6-10 |
| 7.1-11.4 |
205 |
1.0 |
115-180 |
70-120 |
90-120 |
6 |
8-10 |
10-20 |
| 12.2-18.2 |
200 |
1.0 |
180-290 |
120-170 |
120-150 |
8 |
10-15 |
20-30 |
| 20.1-25.5 |
195 |
1.5 |
290-330 |
170-210 |
- |
10 |
15-20 |
25-28 |
|
| BUTT
FUSION JOINTING – ANGULAR (BEND FABRICATION) |
The machine is used to cut the pipe in any required
angle by cutter on machine. Then these cut pieces or
segments of pipe will be butt jointed in angular direction
to form a bend. All values of butt fusion will be maintained
as stated earlier.
Schematic Diagram Of Socket/Butt
Fusion Machine.
Chamfering, cutting to size, heating, pressurizing etc.
operations done on the machine. Machine is mounted on
moving trolley. |
|
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