Page 304 - Industrial Process Plant Construction Estimating and Man Hour Analysis

TABLE F.3 Socket and seal welding, MH per weld—cont’d
Seal
welding Socket welding
Without With
Outside Inside stress stress
MH per weld size header header relieving relieving
Over 2 to 2-1/2 OD 1.4 1.5 1.7 2.2
00
00
tube
00
00
Over 2-1/2 to 3-1/4 O. 1.7 1.8 2.1 2.6
D. tube
Over 3-1/4 to 4 OD 1.9 2.1
00
00
tube
00
Over 4 to 4-1/2 OD 2.1 2.4
00
tube
Over 4-1/2 to 5-1/2 00 2.3 2.7
00
OD tube
Place and weld
2-1/2 HH fitting 2.2
00
00
3-1/4 HH fitting 2
00
4 HH fitting or blind 2.5
nipple
00
4-1/2 HH fitting or blind 2.7
nipple
Radiograph and header 2.8
end plugs
For seal welding 2 generating tubes inside drums, reexpanding and NDE, use 1.2 MH/JT.
00

TABLE F.4 Field tube welding, MH/weld

Tube welding—MH/weld
Design pressure (PSI)
Up to 501– 1001– 1501– 2001– 2501–
500 1000 1500 2000 2500 3000
Tube size (OD)
1 <BW 2.4 2.6 2.8 3.0 3.2 3.4
00
<¼1-1/2 TIG
00
1-1/2 00 2.7 2.9 3.4 3.7 4.0 4.3
<BW<¼2 TIG
00
2 <BW 3.2 3.3 3.8 4.2 4.2 4.4
00
<¼2-1/2 TIG
00
Continued