Fouling in heat exchangers is an unavoidable by-product of the heat transfer process. The decision regarding periodic maintenance (cleaning) of the exchangers subject to fouling is generally based on thermal and economic behavior of the process. In this paper, a reliability-based maintenance strategy is discussed by incorporating the risk and scatter parameters of the linear random fouling growth model. In addition, the dimensionless cost-objective function is formulated by considering various cost elements for a heat exchanger used in a crude oil preheat train. The variation in the dimensionless cost Γ with reduced time tp/(tp + tdown) is presented for different values of unit cost parameters γ1, γ2, and γ3 representing additional fuel cost, antifoulant cost, and miscellaneous costs, respectively. Furthermore, the optimal cleaning cycle of the heat exchanger recently investigated by Casado (1990) is demonstrated to be a special case of the results presented in the paper.

Issue Section:
Technical Papers
Topics:
Heat exchangers, Maintenance, Reliability, Crude oil, Cycles, Electromagnetic scattering, Fuels, Heat transfer, Risk, Trains
1.
Ahmed
M.
, and
Sheikh
A. K.
,
1984
, “
Bernstein Reliability Model: Derivation and Estimation of Parameters
,”
Reliability Engineering
, Vol.
8
, pp.
131
–
148
.
2.
API Data Book—Petroleum Refining, 1978, “Procedure 7B4.7: Alternate Computer Method for Enthalpy of Petroleum Fractions,” 4th Edition, American Petroleum Institute, pp. 7.133–7.134.
3.
Casado
E.
,
1990
, “
Model Optimizes Exchanger Cleaning
,”
Hydrocarbon Processing
, Vol.
69
(
8
), pp.
71
–
76
.
4.
Garrett-Price, B. A., Smith S. A., Watts, R. L., Knudsen, J. G., Marner, W. J., and Suitor, J. W., 1985, Fouling of Heat Exchangers. Noyes, NJ.
5.
Haq, M. U., 1995, “Reliability-Based Maintenance-Strategies for Heat Exchangers Subject to Fouling,” M.Sc. thesis, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.
6.
Hager
M. J.
,
1991
, “
Selection, Operation and Maintenance Experience with Flat Plate Heat Exchangers
,”
Practical Aspects and Performance of Heat Exchanger Components and Materials
, eds., J. R. Maurer and A. L. Steel, ASME PWR-Vol.
14
, New York, NY, pp.
41
–
45
.
7.
Kern, D. Q., 1965, Process Heat Transfer, McGraw-Hill Book Company, New York, NY.
8.
Knubdsen
J. G.
,
1989
, “
Coping with Cooling Water Fouling in Tubular Heat Exchangers
,”
AIChE Symposium Series
, Vol.
85
(
269
), pp.
1
–
12
.
9.
Musalli
Y.
,
Hecker
E. G.
,
Padmanabhan
M.
,
Cooper
C.
, and
Whitt
M.
,
1991
, “
Improved On-line Condenser Cleaning Ball Distribution
,”
Practical Aspects and Performance of Heat Exchanger Components and Materials
, eds., J. R. Maurer and A. L. Steel, ASME PWR-Vol.
14
, New York, NY, pp.
51
–
56
.
10.
Shaik, M. N., 1990, “Reliable Life-Prediction Models for Various Material Damage Processes,” M.Sc. thesis, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.
11.
Zubair
S. M.
,
Sheikh
A. K.
, and
Shaik
M. N.
,
1992
, “
A Probabilistic Approach to The Maintenance of Heat-Transfer Equipment Subject to Fouling
,”
Energy
, Vol.
17
(
8
), pp.
769
–
776
.
12.
Zubair, S. M., Sheikh, A. K., Budair, M. O., and Badr, M. A., 1996a, “A Probabilistic Maintenance Strategy For Heat Exchangers Subject to Fouling,” Fouling Mitigation of Industrial Heat Exchangers, paper to be published in Engineering Foundation Conference Proceedings, New York, NY.
13.
Zubair, S. M., Sheikh, A. K., Budair, M. O., Huq, M. U., Quddus, A., and Ashiru, O. A., 1996b, “Statistical Analysis of CaCO3 Scaling in Heat Exchanger Tubes,” Fouling Mitigation of Industrial Heat Exchangers, paper to be published in Engineering Foundation Conference Proceedings, New York, NY.
14.
Zubair, S. M., Sheikh, A. K., Budair, M. O., and Younas, M., 1997, “A Maintenance Strategy for Heat Transfer Equipments Subject to Fouling Processes,” Final Report of KFUPM Research Project No. ME/FOULING/176, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia, to be published.
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