Page 73 - Estimators Piping Man Hour Manual

56 Section One-SHOP FABRICATION

PREHEATING HEAVY WALL PIPE BUTT WELDS
LABOR ONLY
Carbon Steel or Alloy Materials
For Temperatures Up to 400 °F.
NET MAN HOURS EACH
Nominal WALL THICKNESS IN INCHES
Pipe
Size .750 LOO 1.25 1.50 1.75 2.00 2.25 2.50
3 0.9 1.0 „ .. .. ..
4 1.2 1.3 1.5 1.7 - - „
5 ... 1.6 1.8 2.0 2.1 2.4 -
6 „ 1.8 2.1 2.3 2.5 2.7 2.9
8 ._ 2.5 2.9 3.1 3.3 3.7 3.8 4.1
10 „ 3.5 3.7 4.0 4.6 4.9 5.3
12 „ - - 5.2 5.6 5.9 6.3 6.8
14 - .. - 6.2 6.7 7.1 7.7 8.1
16 - .. .. - 8.0 8.5 8.9 9.8
18 ... - ,. - 10.4 11.0 11.6
20 „ - - .. 11.9 12.8 13.5
22 .. .. .. .. 14.6
24 -- - -- - -- .. 15.8

2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50
10 6.0 6.4 „ .. ..
12 7.3 7.7 8.3 8.8 „ — .. -.,
14 8.7 9.2 9.8 10.4 11.0 11.9 - „
16 10.4 11.0 11.6 12.4 13.2 14.1 ...
18 12.5 13.4 14.2 15.0 15.9 16.8 „
20 14.4 15.4 16.4 17.4 18.5 19.4 20.3 21.3
22 15.6 16.8 17.7 18.9 20.2 21.4 22.5 23.7
24 16.8 18.0 19.3 20.5 21.9 23.5 24.1 25.6

4.75 5.00 5.25 5.50 5.75 6.00
20 22.4 23.5 24.8 26.0 27.2 28.6
22 24.8 26.0 27.2 28.6 29.7 30.9
24 27.2 28.6 29.7 30.9 32.2 33.5
For General Notes, see the bottom of page 55.