| Boiler
Tubes and Super Heater Tubes Confirming to IS 1914 (Part I
& IV)/1982 |
|
Dimensions
|
|
Outside Diameter
|
Thickness
|
|
mm
|
mm
|
|
25.4
|
2.9
|
|
31.8
|
2.9, 3.2
|
|
38.1
|
2.9, 3.2
|
|
44.5
|
2.9, 3.2
|
|
50.8
|
2.9, 3.2
|
|
57.0
|
2.9, 3.2
|
|
| Chemical
Composition |
|
Carbon
|
0.80% 0.25 %
|
|
Manganese
|
0.35 % 1.40 %
|
|
Silicon
|
0.35 % Max
|
|
Phosphorous
|
0.050% Max
|
|
Sulphur
|
0.05% Max
|
|
| Mechanical
Properties |
|
Grade
|
Tensile Strengths
|
|
320
|
320 480
|
|
360
|
360 500
|
|
440
|
440 580
|
|
|
1) Note : Each tube is Hydraulically tested to stand
1.5 times of designed pressure subject to minimum of 7 MPA.
2) Tubes are annealed and normalised through out their length.
|
|
Tolerances
Maximum Deviation for design metal.
Temperature not exceeding
454ēC
|
a) Thickness
(Excluding the weld)
|
+ 10%
- 5%
|
| b) Outside
Diameter |
+ 0%
- 1%
|
c)
Weight
On individual lengths + 10% #9; #9; #9; -8%
|
+10%
-8% |
| d) Length:Upto
& including 9m + 3mm |
- 0mm
|
|
|
|
