Page 135 - Estimators Piping Man Hour Manual

118 Section Two-FIELD FABRICATION

MACHINING INSIDE OF LABGE O.D. PIPE

Built-Up Ends

Carbon Steel Material
NET MAN HOURS— PER END
Machining Inside of Straight Pipe Only I.D. Built-up
• j,r
WlltJu
O.D. WALL THICKNESS IN INCHES Weld Material
ripe
13ivm
Size .500 to 1.51 to 2.26 to 3.01 to 4.51 to Man Hours
Inches 1.50 2.25 3.00 4.50 6.00 Per End
26 4.41 5.30 6.31 8.07 10.11 15.20
28 4.76 5.70 6.79 8.56 10.66 17.98
30 5.30 6.11 7.26 9.10 11.27 22.73
32 5.84 6.79 7.67 9.70 12.01 27.82
34 6.58 7.40 8.41 10.38 12.63 35.01
36 7.40 8.28 9.16 11.00 13.30 41.67
38 8.28 9.23 10.18 11.80 14.04 48.85
40 9.23 10.18 11.27 12.63 14.86 57.06
42 10.24 11.06 12.35 13.44 15.74 66.91
44 11.20 12.28 13.44 14.46 16.56 77.49
46 12.28 13.30 14.58 15.61 17.57 87.32
48 13.44 14.46 15.67 16.70 18.60 98.45
54 15.12 16.26 17.63 18.79 20.92 110.75
60 16.80 18.07 19.59 20.87 23.25 123.06

Machining: Man hours for machining the inside of straight pipe are for any taper bore from 10° through 30°
included angle. For machining the ends of bends add 100% to the above man hours. For counterboring (up
to a maximum of 2" in length), add 30% to the above man hours. For machining to a controlled "C"
dimension (as required for power piping critical systems), add 225% to the above man hours.

Cutting and Beveling: Man hours do not include cutting and beveling. See respective tables for these charges.
Built-Up Ends: Man hours for built-up ends are for building up the I.D. of straight pipe, bends or fittings, at the
ends with weld metal and grinding where it is necessary for proper fit of backing rings.