Page 110 - Estimators Piping Man Hour Manual

Section Two-FIELD FABRICATION 93

Man Hours—Welding Only
Carbon Steel Material
NET MAN HOURS EACH
Standard Extra
Pipe Heavy Pipe SCHEDULE NUMBERS
Size & OD Sizes & OD Sizes
Ins. 3/8 "Thick 1/2" Thick 20 30 40 60 80 100 120 140 1 160
__ __ __ __
1 0.7 0.8 __ 0.7 0.8 .- 1.0
1-1/4 0.8 0.8 .. 0.8 -- 0.8 -- __ -- __ -- 1,1
1-1/2 0.8 0.9 -- -- 0.8 -- 0.9 1.3
__ __ __ __
2 1.0 1.0 1.0 __ 1.0 __ 1.6
2-1/2 1.2 1.3 — _- 1.2 1.3 -- L8
--
__ __ __ __ __
3 1.3 1.4 1.3 1.4 2, 1
3-1/2 1.4 1.6 -- -- 1.4 -- 1.6 --
—
4 1.5 1.8 -- -- 1.5 .. 1.8 -- 2.8 3.0
5 1.7 2.1 -- -- 1.7 -. 2.1 -- 2.9 -- 3.8
__
6 2.0 2.5 -- 2.0 _- 2.5 _. 3.8 4.9
—
8 2.6 3.3 2.6 2.6 2.6 3.0 3.3 4.6 6.0 7.5 8.6
10 3.1 4.0 3.1 3.1 3.1 4.0 5.1 I 6.8 9.4 11.4 13.1
12 3.6 4.7 3.6 3.6 4.1 5.2 6.6 1 9.9 12.2 15.3 17.9
HOD 4.3 5.7 4.3 4.3 5.0 6.8 9.6 13.2 16.2 19.2 22.7
16 OD 5.0 6.6 5.0 5.0 6.6 8.4 12.4 19.5 20.7 25.0 27.7
18 OD 5.9 7.7 5.9 6.8 8.6 11.2 16.4 21.8 25.6 29.9 33.7
20 OD 6.3 8.4 6.3 8.4 9.4 13.8 19.5 26.0 31.9 37.0 40.8
24 OD 6.9 10.1 6.9 -- 13.3 20.1 25.2 35.8 43.5 49.3 59.3

Pipe Thickness: Wail thickness of the pipe determines the man hours that will apply, for butt
welds of double extra strong materials, use schedule 160 man hours.
Mitre Welds; Add 50% to butt weld man hours.
Cutting and Beveling Pipe: Man hours do not include cutting and beveling of pipe. See respective tables for these
charges.
Preheating: If specified or required by codes, add for this operation. See man hours for preheating.
Stress Relieving: Stress relieving of welds in carbon steel materials is required by the A.S.A. code for pressure
piping, where the wall thickness is 3/4" or greater.
All sizes of butt welds shown below the ruled lines are 3/4" or greater in wall thickness and must be stress
relieved.
Where stress relieving is required an extra charge should be made. See man hours for stress relieving.
For Geneml Notes on welding, see page 92.