Page 70 - Estimator's Piping Man-Hour Manual 5E

Section One-SHOP FABRICATION 53

BORING INSIDE DIAMETER OF PIPE
AND INSTALLING STRAIGHTENING VANES

NET MAN HOURS EACH
Nominal Boring I.D. Installing Straightening
Pipe Size of Pipe Vanes
Inches Carbon Steel Carbon Steel Alloy
4 8.3 6.4 9.6
5 99 7.4 11.1
6 11.3 9.1 12.9
8 14.8 10.7 16.0
10 17.7 11.8 17.7
12 21.7 13.2 20.1
14 25.0 14.9 22,3

16 30.0 16.5 25.0
18 37.3 18.7 28.0
20 48.9 21.0 31.5
24 67.0 25.6 38.5
26 .. 30.4 45.8
28 -- 33.6 50.7
30 -- 38.9 58.3

32 .. 45.0 67.7
34 -- 50.7 76.2
36 -- 58.3 87.5
38 -- 65.2 98.1
40 -- 72.2 108.2
42 -- 79.4 119.2

Man hours for boring I.D. only include boring pipe for a length of four times nominal pipe size.
Man hours for installing straightening vanes are based on installing vanes in pipe where boring the I.D. of pipe is
not required. If boring I.D. of pipe is required or specified, add boring man hours as shown above.