Page 67 - Estimators Piping Man Hour Manual

50 Section One-SHOP FABRICATION

WELDED CARBON STEEL ATTACHMENTS
NET MAN HOURS PER LINEAL INCH
Thickness of ** Layout and Fillet Welding
Plate, etc. Flame Cutting per Lin, Inch
Inches per Lin. Inch
1/2 or less 004 0,04
3/4 004 0.06
1 0 04 0.08
1-1/4 0 06 0.1
1-1/2 0 06 0.1
1-3/4 007 0.2

2 008 0.2
**Figure labor on basis of total lineal inches to be cut and fillet welded.
Unlisted thicknesses take the next higher listing.
Man hours do not include machining of bases, anchors, supports, lugs, etc.
If preheating is required, add 100% to the above man hours.

DRILLING HOLES IN WELDED ATTACHMENTS
Carbon Steel Material
MAN HOURS EACH
Thickness of HOLE SIZE
Plates, Angles
Etc. in Inches 3/4" and Smaller 7/8", 1" and 1-1/8" 1-1/4", 1-1/2" and 2" 2- 1/4" and 2- 1/2"
I/ 2" or less 0.20 0.24 0.28 0.39
3/4 0.24 0.28 0.36 0.46
1 0.26 0.33 0.41 0.51
1-1/4 0.33 0.41 0.46 0.59
1-1/2 0.41 0.46 0.59 0.76
1-3/4 0.46 0.59 0.72 0.93
2 0.59 0.68 0.84 1.10
2-1/2 0.68 0.73 0.93 1.35
3 0.76 0.93 1.10 1.52
3-1/2 0.84 1.01 1.27 1.78
4 1.01 1.18 1.44 2.03
Unlisted thicknesses of plate or sizes of holes take the next higher listing.
If holes are to be tapped—Add 33-1/3%.
Drilling of Sentinel, Safety or Tell Tale holes will be charged at .05 man hours.
The above man hours are for drilling holes in flat carbon steel plate and structural shapes only.
For drilling holes in pipe or other contoured objects, perpendicular to contoured surface, add 100% to the above
man hours.
For drilling holes in pipe or other contoured objects, oblique to contoured surface, add 175% to the above man
hours.