Page 90 - Estimator's Piping Man-Hour Manual 5E

Section One-SHOP FABRICATION 73

Descaling R. T. J. Flange Faces: Oxidation (scale) created in R. T. J. grooves of flanges because
of Stress Relieving or Heat Treating should be removed and charged for at the foEowing
man hours.

Flange Flange
Size Man Size Man
Inches Hours Inches Hours
3 or less 0.6 14 2.5

4 0.9 16 3.2
6 1.0 18 3.5
8 1.3 20 3.9
10 1.8 24 4.6
12 1.9
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Miscellaneous X-Rays: If specified, the following X-Rays should be taken and charged accord­
ingly. Slip-on Welds X-rayed will be charged the same man hours as a Butt Weld X-ray.
Mitre and Nozzle Welds X-rayed should be charged at 50% more than the Butt Weld X-ray
man hours.
Lineal Welding X-rayed should be charged at 0.7 man hours per foot through 1" thickness
and at 1.0 man hours per foot for thickness greater than 1". For alloys add 25% to these
man hours.
Preheating Coupling Welds: On any size you should charge the man hours of Preheating a 2"
extra heavy Nozzle Weld.