UFC 3-240-13FN
25 May 2005
Figure 3-6. Impact of Scale on Heat Transfer
10,340 KPa (1500 psi)
140o C (280oF)
883,288 J/M2/S (280,000 Btu/sq.ft./hr)
115oC (240oF)
Analcite (sodium aluminum silicate)
Magnesium phosphate
90oC (200oF)
Magnetic iron oxide
(magnetite, Fe3O4)
70oC (160oF)
Calcium phosphate
(hydroxyapatite)
50oC (120oF)
30oC (80oF)
5oC (40oF)
0.25
0.05
0.10
0.15
0.20
Mm
(0.010)
(0.002)
(0.004)
(0.006)
(0.008)
(Inch)
Deposit Thickness
Figure 3-7. Metal Fatigue on Boiler Tube
40
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