Page 56 - Industrial Process Plant Construction Estimating and Man Hour Analysis

Process piping Chapter 2 27

2.3.2 Welding butt weld, carbon steel, and SMAW—Uphill
Facility—Oil refinery

Man-hours per joint
Wall thickness in inches
Pipe
size Up to 0.375 00 0.406 –0.500 00 0.562 –0.688 00 0.718 –0.938 00 1.031 –1.219 00
00
00
00
00
0.5 1.00 1.15 1.90 2.25 2.60
0.75 1.00 1.15 1.90 2.25 2.60
1 1.00 1.15 1.90 2.25 2.60
1.5 1.00 1.15 1.90 2.25 2.60
2 1.00 1.15 1.90 2.25 2.60
2.5 1.13 1.25 2.38 2.75 3.38
3 1.35 1.50 2.85 3.30 4.05
4 1.80 2.00 3.80 4.40 5.40
6 2.70 3.00 5.70 6.60 8.10
8 3.60 4.00 7.60 8.80 10.80
10 4.50 5.00 9.50 11.00 13.50
12 5.40 6.00 11.40 13.20 16.20
14 6.30 7.00 13.30 15.40 18.90
16 7.20 8.00 15.20 17.60 21.60
18 8.10 9.00 17.10 19.80 24.30
20 9.00 10.00 19.00 22.00 27.00
24 10.80 12.00 22.80 26.40 32.40
Manual butt welds.
Wall thickness of the pipe determines man-hours that will apply per joint.
PWHT butt welds greater than or equal to 0.750 .
00
Apply percentages for welding alloys and nonferrous butt welds.