This paper presents the results of an experimental investigation conducted to evaluate the effect of initial tube-tubesheet diametral clearance on the integrity of roller-expanded tube-to-tubesheet joints in overenlarged tubesheet holes. The criteria of evaluating joint integrity include the pullout force and hydraulic tightness of the joints in which tubes were expanded to 5% wall reduction after metal to metal contact of the tube with the tubesheet hole. The levels of clearance investigated were selected to cover a range that exceeded by ten times that prescribed by the Tubular Exchangers Manufacturers Association (TEMA) standards (Standards for the Tubular Exchanger Manufacturers Association, 1988, 7th ed., TEMA, Tarrytown, NY). The pullout test results showed that, within the investigated range of clearance, the joint strength has not declined below the strength of joints with clearance levels within the TEMA range. In fact, the pullout force exhibited a slight linear increasing trend with the increase in initial clearance, which is attributed to the effect of tube strain hardening. The hydrotest results indicated that all joints within the investigated clearance levels were hydraulically tight when they were tested at 1.5 times the design pressure of the heat exchanger for a duration of . A relationship between rolling specific energy and initial joint clearance has been developed.
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February 2008
Research Papers
Integrity of Roller-Expanded Tube-to-Tubesheet Joints With Overenlarged Tubesheet Holes
A. N. Shuaib,
A. N. Shuaib
Mem. ASME
Mechanical Engineering Department,
e-mail: arshuaib@kfupm.edu.sa
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
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N. Merah,
N. Merah
Mem. ASME
Mechanical Engineering Department,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
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M. Ahmed,
M. Ahmed
Mechanical Engineering Department,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
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Y. N. Al-Nassar,
Y. N. Al-Nassar
Mechanical Engineering Department,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
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S. S. Al-Anizi
S. S. Al-Anizi
Consulting Services Department,
Saudi Arabian Oil Company
, Dhahran 31311, Saudi Arabia
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A. N. Shuaib
Mem. ASME
Mechanical Engineering Department,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabiae-mail: arshuaib@kfupm.edu.sa
N. Merah
Mem. ASME
Mechanical Engineering Department,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
M. Ahmed
Mechanical Engineering Department,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
Y. N. Al-Nassar
Mechanical Engineering Department,
King Fahd University of Petroleum and Minerals
, Dhahran 31261, Saudi Arabia
S. S. Al-Anizi
Consulting Services Department,
Saudi Arabian Oil Company
, Dhahran 31311, Saudi ArabiaJ. Pressure Vessel Technol. Feb 2008, 130(1): 011203 (6 pages)
Published Online: January 17, 2008
Article history
Received:
June 10, 2006
Revised:
November 23, 2006
Published:
January 17, 2008
Citation
Shuaib, A. N., Merah, N., Ahmed, M., Al-Nassar, Y. N., and Al-Anizi, S. S. (January 17, 2008). "Integrity of Roller-Expanded Tube-to-Tubesheet Joints With Overenlarged Tubesheet Holes." ASME. J. Pressure Vessel Technol. February 2008; 130(1): 011203. https://doi.org/10.1115/1.2826429
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