Page 74 - Estimator's Piping Man-Hour Manual 5E

Section One-SHOP FABRICATION 57

PREHEATING LARGE O.D. PIPE BUTT WELDS
AND ANY TYPE FLANGE WELDS

Carbon Steel Material
For Temperatures Up to 400°F.

NET MAN HOURS EACH
WALLTHICKN ESS IN INCHES
O.D,
Pipe .500
Inches or less .750 1.00 1.25 1.50 1.75 2.00 2.25
26 6.4 7.2 8.7 10.6 12.3 13.6 15.5 17.4
28 7.0 7.8 9.2 11.1 13.0 14.4 16.5 18.6
30 7.5 8.1 10.0 11.9 13.8 15.3 17.6 19.9
32 7.9 8.7 10.4 12.5 14.6 16.2 18.6 21.0
34 8.5 9.2 11.0 13.4 15.8 17.4 19.7 22.5
36 9.1 10.0 11.7 14.6 17.4 19.1 21.8 24.6
38 9.2 10.6 12.7 15.5 19.3 21.0 24.0 27.0
40 9.5 11.4 13.8 16.5 21.4 23.0 26.3 29.8
42 10.2 12.2 14.9 17.8 23.8 25.4 28.9 32.7
44 11.0 13.0 16.5 20.3 24.8 27.9 31.9 36.7
46 11.8 13.9 18.0 22.3 26.7 30.6 34.8 39.1
48 12.7 14.9 19.5 24.2 28.7 33.3 38.0 42.6
54 14.3 16.8 21.9 27.2 32.3 37.5 42.7 47.9
60 15.9 18.6 24.4 30.2 35.9 41.6 47.5 53.3

2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25
26 19.3 21.1 23.0 24.9 26.8 28.6 30.5 32.4
28 20.5 22.3 24.6 26.1 28.0 29.9 31.8 33.7
30 21.8 23.7 25.7 27.2 29.2 31.0 33.3 34.8
32 22.9 24.8 27.0 28.4 30.3 32.2 34.4 36.0
34 24.4 26.3 28.4 29.9 31.9 33.7 35.9 37.5
36 25.6 28.4 30.5 32.1 34.0 35.9 38.0 39.7

4.50 4.75 5.00 5.25 5.50 5.75 6.00
26 34.3 36.2 38.0 39.9 41.8 43.7 45.6
28 35.6 37.3 39.2 41.1 43.0 44.9 47.2
30 36.7 38.6 40.5 42.4 44.1 46.0 48.3
32 37.8 39.7 41.6 43.5 45.4 47.3 49.5
34 39.3 40.7 43.1 45.0 46.6 48.7 51.0
36 41.5 43.4 45.3 47.2 48.9 50.8 53.1
For General Notes, see the bottom of page 55.