Sunday, 21 August 2016
Wednesday, 1 June 2016
Friday, 27 May 2016
Method Of Repairing Weld Joint
METHOD OF
REPAIRING JOINT
1
Surface
defects shall be identified during visual weld examination. Location of repair
portion shall be marked and the weld defect shall be removed to sound metal.
Repair welds shall be made using the welding procedure of the original joint by
a qualified welder.
2
Defects
that are not depend to the surface shall be identified by RT, UT or MT will be
marked and grinding shall be carried out until the defects is detected and
excavated to ensure the removal of defects to the full extent, suitable NDT
method (PT) may be applied prior to start welding. Repair welds shall be made
using the welding procedure of the original joint by a qualified welder.
3
Preheating
and Heat treatment shall be as required for the original welding as per
approved WPS.
4
After
welding appropriate NDT shall be carried out to check the integrity of the repair weld
.
5
If the joint is partial repair the defected area
shall be marked for repair.
6
If
the joint is full repair, the joint will be cut-out and re fit-up shall be
checked by Welding inspector and released for welding.
7
Welding inspector approval is required to do the welding of cut-out joints.
8 Prior
to start the welding of cut-out joints Welding inspector will give enough
awareness for the particular welder not to repeat the repair.
9 After
the repairing of joints it shall be visually inspected by Welding inspector
for initial acceptance.
10 The
same shall be offered for radiography examination.
Wednesday, 25 May 2016
Reinforcing Pad Fabrication Formula and Data sheet
Reinforcing Pad Fabrication Formula and Data sheet
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Sunday, 22 May 2016
Saturday, 21 May 2016
Welding Procedure Specification for GTAW + SMAW
This Only Reference Sample Copy of Welding Procedure Specification for GTAW + SMAW welding Process
Friday, 20 May 2016
Testing Blind plate & Blank Thickness Calculation
Testing( Hydrostatic & Pneumatic )-Blind plate & Blank Thickness calculation Chart and Formula
TEST PRESS. (Kg/cm2)
|
PIPE SIZE
|
||||||||||||||
1.1/2
|
2
|
2.1/2
|
3
|
4
|
5
|
6
|
8
|
10
|
12
|
14
|
16
|
18
|
20
|
24
|
|
7
|
1.6
|
2.0
|
2.3
|
3.0
|
4.0
|
4.5
|
5.5
|
7.0
|
9.0
|
10.5
|
11.5
|
13.0
|
14.5
|
16.5
|
19.5
|
14
|
2.3
|
2.7
|
3.5
|
4.0
|
5.5
|
6.5
|
7.5
|
10.0
|
12.5
|
15.5
|
16.0
|
18.5
|
21.0
|
23.0
|
28.0
|
21
|
2.7
|
3.4
|
4.0
|
5.0
|
6.5
|
8.0
|
9.5
|
12.0
|
15.0
|
18.5
|
20.0
|
22.5
|
25.5
|
28.5
|
34.0
|
28
|
3.2
|
4.0
|
5.5
|
6.0
|
7.5
|
9.0
|
11.0
|
14.0
|
17.5
|
21.0
|
23.0
|
26.0
|
29.5
|
32.5
|
39.0
|
35
|
3.5
|
4.5
|
6.0
|
6.5
|
8.5
|
10.0
|
12.0
|
16.0
|
19.5
|
23.5
|
25.5
|
29.0
|
33.0
|
36.5
|
43.5
|
42
|
4.0
|
4.5
|
6.0
|
7.0
|
9.0
|
11.0
|
13.5
|
17.5
|
21.5
|
25.5
|
28.0
|
32.0
|
36.0
|
40.0
|
48.0
|
49
|
4.0
|
5.0
|
7.0
|
7.5
|
10.0
|
12.0
|
14.5
|
18.5
|
23.0
|
27.5
|
30.0
|
34.5
|
39.0
|
43.0
|
51.5
|
56
|
4.5
|
5.5
|
7.0
|
8.0
|
10.5
|
13.0
|
15.5
|
20.0
|
25.0
|
29.5
|
32.5
|
37.0
|
41.5
|
46.0
|
55.5
|
63
|
5.0
|
6.0
|
7.5
|
8.5
|
11.0
|
14.0
|
16.0
|
21.0
|
26.5
|
31.0
|
34.0
|
39.0
|
44.0
|
49.0
|
58.6
|
70
|
5.0
|
6.0
|
8.0
|
9.0
|
12.0
|
14.5
|
17.0
|
22.5
|
27.5
|
33.0
|
36.0
|
41.0
|
46.5
|
51.5
|
62.0
|
77
|
5.5
|
6.5
|
8.0
|
9.5
|
12.0
|
15.0
|
18.0
|
23.5
|
29.0
|
34.5
|
38.0
|
43.0
|
48.5
|
54.0
|
65.0
|
84
|
5.5
|
7.0
|
8.5
|
10.0
|
13.0
|
16.0
|
18.5
|
24.5
|
30.5
|
36.0
|
39.5
|
45.0
|
51.0
|
56.5
|
68.0
|
91
|
5.5
|
7.0
|
9.0
|
10.5
|
13.5
|
16.5
|
19.5
|
25.5
|
31.5
|
39.5
|
41.0
|
47.0
|
53.0
|
58.5
|
70.5
|
98
|
6.0
|
7.5
|
9.0
|
10.5
|
14.0
|
17.0
|
20.0
|
26.5
|
33.5
|
39.0
|
42.5
|
49.0
|
55.0
|
61.0
|
73.0
|
105
|
6.0
|
7.5
|
9.5
|
11.0
|
14.5
|
17.5
|
21.0
|
27.0
|
34.0
|
40.0
|
44.0
|
50.5
|
57.0
|
63.0
|
75.5
|
112
|
6.5
|
8.0
|
10.0
|
11.5
|
14.5
|
18.0
|
21.5
|
28.0
|
34.0
|
41.5
|
45.5
|
52.0
|
58.5
|
65.0
|
78.0
|
119
|
6.5
|
8.0
|
10.0
|
12.0
|
15.0
|
18.5
|
22.0
|
29.0
|
36.0
|
43.0
|
47.0
|
54.0
|
60.5
|
69.0
|
80.5
|
126
|
6.5
|
8.5
|
10.5
|
12.0
|
15.5
|
20.0
|
23.0
|
30.0
|
37.0
|
44.0
|
48.5
|
55.5
|
62.0
|
69.0
|
83.0
|
133
|
7.0
|
8.5
|
10.5
|
12.5
|
16.0
|
20.0
|
23.5
|
30.5
|
38.0
|
45.5
|
49.5
|
57.0
|
64.0
|
71.0
|
85.0
|
140
|
7.0
|
9.0
|
10.5
|
13.0
|
16.5
|
20.5
|
24.0
|
31.5
|
39.0
|
46.5
|
51.0
|
58.5
|
65.5
|
73.0
|
87.5
|
175
|
8.0
|
10.0
|
12.0
|
14.5
|
18.5
|
23.0
|
27.0
|
35.0
|
44.0
|
52.0
|
57.0
|
65.0
|
73.5
|
81.5
|
97.5
|
210
|
8.5
|
11.0
|
13.0
|
15.5
|
20.0
|
25.0
|
30.0
|
38.5
|
48.0
|
57.0
|
62.5
|
71.0
|
80.5
|
89.0
|
107
|
2. The piping
diameter is 1” and below, the following table shall be followed for the
thickness of blind plate.
Test Pressure (kg /
cm2)
|
Thickness of Blind
Plate (mm)
|
7 and below
|
1.6
|
8 ~ 14
|
2.3
|
15 ~ 40
|
2.5
|
41 ~ 60
|
3.2
|
61 ~ 115
|
4.5
|
116 ~ 210
|
6.0
|
3.The piping diameter is greater than or equal to 26”, following
formula shall be applied to determine the thickness of blank.
Thickness of blank (t) mm =
Thickness of blank (t) mm =
(Ref. ASME B31.3
dg : inside diameter of
gasket (mm)
P : Test pressure (Kg/cm2)
S : Allowable Stress
(Kg/cm2)
E : Quality Factor