Page 38 - Estimators Piping Man Hour Manual
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Section One~SHOP FABRICATION 21
SPECIAL fTrUNG AND PREPARATION FOR
INERT GAS SHIELDED ROOT PASS WELDING
Butt Welds
NET MAN HOURS EACH
CARBON STEEL, CHROME ALLOY AND STAINLESS STEEL
Pipe Pipe
Size AH Size All
Inches Thicknesses Inches Thicknesses
2 "or less 0.45 26 O.D 5.37
2-1/2 0.64 28O.D. 6.12
3 0.75 30O.D. 6.48
1
4 0.94 32O.D, 6.83
5 1.14 34O.D. 6.88
6 1.36 36O.D. 7.06
8 1.67 38 O.D. 7.39
10 1.92 40O.D. 8.23
12 2,06 42 O.D 9,06
14O.D. 2,66 44 O.D. 9.87
16O.D. 3.19 46 O.D, 10.93
18O.D. 3.90 48 O.D 11.99
20O.D. 4.22 54 O.D. 13.15
24O.D. 4.68 60 O.D. 14.42
Man hours shown will apply either with or without an internal nitrogen purge.
For internal argon purge, increase above man hours 20 percent.
Man hours do not include the use of an oxygen analyzer.
Man hours do not include the installation of consumable inserts or end preparation for consumable inserts.
For preparation of nozzle welds, 'olet welds, coupling welds, and mitre butt welds for inert gas shielded root pass
add 100 percent to the above man hours.
If the purge is to be held longer than the first two passes, increase the above man hours 50 percent for each
additional pass for which the purge is held.
