Page 53 - Industrial Process Plant Construction Estimating and Man Hour Analysis

24 Industrial Process Plant Construction Estimating and Man-Hour Analysis

2.2.1 General welding notes
Manual butt welds—wall thickness of the pipe determines man-hours that will
apply per joint.
00
Postweld heat treatment (PWHT) butt welds greater than or equal to 0.750 .
PWHT craft support—man-hours for craft to warp/and remove pipe insula-
tion for stress relief.
Apply percentages for welding alloys and nonferrous butt welds.
Preheating and stress relieving butt welds are not included.
Olet welds—man-hours are two times butt weld and include cutting, placing,
and welding per connection.
Stub in weld—man-hours are 1.5 times butt weld and include cutting, plac-
ing, and welding per connection.
Socket welds—man-hours include fit up and welding per joint.
Hydrotest pipe—man-hours to place/remove blinds, open/close valves,
removal/replacement of valves and specialty items and pipe sections as required
and drain lines after testing.