|
Mechanical Properties of Fittings |
The mechanical properties of Fittings samples (representative of finished products) are tested for tensile strength (Min 420 Mpa), hardness (Max 230 BHN) and elongation (Min 5%) to verify mechanical properties.
|
Hydrostatic Testing |
All Ductile Iron fittings are tested at
the works at the following test pressure as specified in ISO : 2531 / BSEN: 545/1995 AND
IS : 9523.
Diameter mm |
Works Test Pressure (kg/cm2) |
80-300 |
25 |
350-600 |
16 |
700-1200 |
10 |
900-1200 |
10 |
For hydrostatic test, the
fittings shall be kept under pressure for 10 seconds
They
shall withstand the pressure test without showing any sign of leakage, sweating or other
defect of any kind
The test shall be
conducted before the application of surface coating.
Dimensions of Push-on
and Mechanical Joint Fittings.
|
External Diameter DE (mm) |
Wall Thickness, DE (mm) |
| DN |
Nominal |
Tolerance |
K12 |
Tolerance |
| 80 |
98 |
+1/-2.7 |
7.0 |
-2.38 |
| 100 |
118 |
+1/-2.8 |
7.2 |
-2.40 |
| 125 |
144 |
+1/-2.8 |
7.5 |
-2.42 |
| 150 |
170 |
+1/-2.9 |
7.8 |
-2.45 |
| 200 |
222 |
+1/-3.0 |
8.4 |
-2.50 |
| 250 |
274 |
+1/-3.1 |
9.0 |
-2.55 |
| 300 |
326 |
+1/-3.3 |
9.6 |
-2.60 |
| 350 |
378 |
+1/-3.4 |
10.2 |
-2.65 |
| 400 |
429 |
+1/-3.5 |
10.8 |
-2.70 |
| 450 |
480 |
+1/-3.6 |
11.4 |
-2.75 |
| 500 |
532 |
+1/-3.8 |
12.0 |
-2.80 |
| 600 |
635 |
+1/-4.0 |
13.2 |
-2.90 |
| 700 |
738 |
+1/-4.3 |
14.4 |
-3.0 |
| 750 |
790 |
+1/-4.4 |
15.0 |
-3.05 |
| 800 |
842 |
+1/-4.5 |
15.6 |
-3.10 |
| 900 |
945 |
+1/-4.8 |
16.8 |
-3.20 |
| 1000 |
1048 |
+1/-5.0 |
18.0 |
-3.30 |
| 1100 |
1152 |
+1/-5.4 |
19.2 |
-3.4 |
It may appear that the
test pressure for fittings are low compared to the allowable working pressures in pipes.
But fittings with K12 thickness of ductile iron cannot burst at allowable working
pressures of pipes.
Due to practical difficulties, fittings are not tested at the factory to very high
pressures. BS : 8010 Section 2.1 British Standard Code of Practice for Pipeline Part 2
(Section 2.1 - Ductile Iron) Clause 13 says, “Practical considerations limit the
works hydrostatic test pressure to values which may be lower than the site test
pressure". The same comment is mentioned in IS : 9523/2000 also. The above pressures
are sufficient to detect any casting flaw. After the pipeline is laid and fittings are in
position and provided with proper anchorage, the entire pipeline can be pressure tested at
a much higher pressure than the works test pressure.
Dimensions of Flange
Drilling for Flange Fittings-PN 10
| All dimensions in millimeters
|
| Nominal Dimensions Diameter
|
Holes |
Bolt
Size
metric |
|
DN |
D |
E |
C |
b |
f |
a |
s |
Nos. |
Dia (d) |
|
80 |
200 |
132 |
160 |
16 |
3 |
19 |
15 |
4 |
19 |
M16 |
100 |
220 |
156 |
180 |
16 |
3 |
19 |
15 |
8 |
19 |
M16 |
125 |
250 |
184 |
210 |
16 |
3 |
19 |
15 |
8 |
19 |
M16 |
150 |
285 |
211 |
240 |
16 |
3 |
19 |
15 |
8 |
23 |
M20 |
200 |
340 |
266 |
295 |
17 |
3 |
20 |
15 |
8 |
23 |
M20 |
250 |
395 |
319 |
350 |
19 |
3 |
22 |
16 |
12 |
23 |
M20 |
300 |
445 |
370 |
400 |
20.5 |
4 |
24.5 |
17.5 |
12 |
23 |
M20 |
350 |
505 |
429 |
460 |
20.5 |
4 |
24.5 |
19.5 |
16 |
23 |
M20 |
400 |
565 |
480 |
515 |
20.5 |
4 |
24.5 |
19.5 |
16 |
28 |
M24 |
450 |
615 |
530 |
565 |
21 |
4 |
24.5 |
20 |
20 |
28 |
M24 |
500 |
670 |
582 |
620 |
22.5 |
4 |
26.5 |
21 |
20 |
28 |
M24 |
600 |
780 |
682 |
725 |
25 |
5 |
30 |
24 |
20 |
31 |
M27 |
700 |
895 |
794 |
840 |
27.5 |
5 |
32.5 |
24 |
24 |
31 |
M27 |
750 |
960 |
857 |
900 |
29 |
5 |
34 |
24 |
24 |
31 |
M27 |
800 |
1015 |
901 |
950 |
30 |
5 |
35 |
24.5 |
24 |
34 |
M30 |
900 |
1115 |
1001 |
1050 |
32 |
5 |
37.5 |
26.5 |
28 |
34 |
M30 |
1000 |
1230 |
1112 |
1160 |
35 |
5 |
40 |
28 |
28 |
37 |
M33 |
|
1100 |
1340 |
1231 |
1270 |
38 |
5 |
43 |
30 |
28 |
37 |
M33 |
Dimensions of Flange
Drilling for Flange Fittings-PN 16
| All dimensions in millimeters |
|
|
Holes |
Bolt Size metric |
| DN |
D |
E |
C |
b |
f |
a |
s |
Nos. |
Dia
(d) |
- |
| 80 |
200 |
132 |
160 |
16 |
3 |
19 |
15 |
8 |
19 |
M16 |
| 100 |
220 |
156 |
180 |
16 |
3 |
19 |
15 |
8 |
19 |
M16 |
| 125 |
250 |
184 |
210 |
16 |
3 |
19 |
15 |
8 |
19 |
M16 |
| 150 |
285 |
211 |
240 |
16 |
3 |
19 |
15 |
8 |
23 |
M20 |
| 200 |
340 |
266 |
295 |
17 |
3 |
20 |
16 |
12 |
23 |
M20 |
| 250 |
400 |
319 |
355 |
19 |
3 |
22 |
17.5 |
12 |
28 |
M24 |
| 300 |
455 |
370 |
410 |
20.5 |
4 |
24.5 |
19.5 |
12 |
28 |
M24 |
| 350 |
520 |
429 |
470 |
22.5 |
4 |
26.5 |
21 |
12 |
28 |
M24 |
| 400 |
580 |
480 |
525 |
24 |
4 |
28 |
22.5 |
16 |
31 |
M27 |
| 450 |
640 |
548 |
585 |
26 |
4 |
30 |
24 |
16 |
31 |
M27 |
| 500 |
715 |
609 |
650 |
27.5 |
4 |
31.5 |
25 |
20 |
34 |
M30 |
| 600 |
840 |
720 |
770 |
31 |
5 |
36 |
27 |
20 |
37 |
M33 |
| 700 |
910 |
794 |
840 |
34.5 |
5 |
39.5 |
27.5 |
24 |
37 |
M33 |
| 750 |
970 |
857 |
900 |
36 |
5 |
41 |
28 |
24 |
37 |
M33 |
| 800 |
1025 |
901 |
950 |
38 |
5 |
43 |
30 |
24 |
40 |
M36 |
| 900 |
1125 |
1001 |
1050 |
41 |
5 |
46 |
32.5 |
28 |
40 |
M36 |
| 1000 |
1255 |
1112 |
1170 |
45 |
5 |
50 |
35 |
28 |
43 |
M39 |
| 1100 |
1355 |
1218 |
1270 |
48.5 |
5 |
53.5 |
37.5 |
32 |
43 |
M39 |
Tolerance on Lengths
Types of castings |
Tolerance (mm) |
| Fittings for
socketted joints |
±20 |
| Fittings for
flanged joints |
±10* |
The Permissible Deviations of the
Lengths of Fittings.
| Types of
fittings |
Nominal
diameter DN mm |
Deviation
in L and H mm |
| Flanged
sockets/ Flanged spigots / collars, tapers |
80-1000 |
±25 |
| Tees |
|
80-1000+50/-25 |
| Bends 90 (1/4) |
80-1000 |
±(15+0.03 DN) |
| Bends 45 (1/8) |
80-1000 |
±(10+0.025
DN) |
| Bends 22
30’ and 11 15’ |
80-1000 |
±(10+0.02 DN) |
Tolerance on Thickness of Flange
| Type of
Flange |
Tolerance |
| Integrally
cast flanges |
± (3+0.05b) |
| Welded and
screwed on Flanges |
± (2+0.05b) |
Push-on Joint Fittings - Allowable
Ovality
| Nominal
Diameter DN |
Allowable
difference between Minor Axis and DEMin |
| mm |
mm |
| 80-300 |
1.0 |
| 350-600 |
1.75 |
| 700 |
2.0 |
| 750-800 |
2.4 |
| 900-1100 |
3.5 |
Mechanical Joint Fittings - Allowable
Ovality
Nominal Diameter DN |
Allowable ovality of Spigot of External diameters DE |
| mm |
mm |
| 80-150 |
5 |
| 200-350 |
10 |
| 400-450 |
20 |
| 600-800 |
30 |
| 900-1100 |
40 |
|
