Page 39 - Estimator's Piping Man-Hour Manual 5E

22 Section One-SHOP FABRICATION

MACHINE BUTT WELDS
Submerged Arc Butt Welds
Carbon Steel Material
NET MAN HOURS EACH
SCHEDULE NUMBER
Size
Ins. 40 60 80 160
2 .40 .. .45 .70
2-1/2 .50 .55 .80

3 .55 -- .60 .90
4 .65 -- ,80 1.30
6 .90 1.05 2.15
8 .99 1.0 1.12 2.92

10 1.08 1.36 1.72 4.44
12 1.19 1.54 1.96 5.32
14O.D. 1.26 1.74 2.43
16O.D. 1.68 2.13 3.15 -
18O.D. 2.19 2.85 4.17
—
20O.D. 2.37 3.51 4,95
24O.D. 3.36 5.10 7.89 ..
Man hours include cutting, beveling, fitting, tack welding, manual single pass or backing
ring, machine set-up and submerged welding.
Above man hours should be used in lieu of manual butt weld man hours on all shop
machine welds which can be rotated.
Above man hours do not include preheating, grinding or stress relieving. See respective
tables for these charges.

This procedure not applicable to alloy pipe.
All sizes of butt welds shown below the ruled lines are %" or greater in wall thickness
and must be stress relieved.