NDLI: Stress Classification for Tubesheet of Heat Exchanger With Semi-Ellipsoidal Heads

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Yoshimura, Naoki Kataoka, Shunji Sato, Takuya
Copyright Year	2013
Abstract	A fixed tubesheet type heat exchanger with semi-ellipsoidal heads which is dealt with in this paper has been adopted for refrigerant heat exchange process in LNG Plant. Since the conventional design standards, e.g. ASME Sec VIII Div.1 and TEMA, are not meant to be used for such a special type of heat exchanger, FEA should be performed to determine minimum required thickness of the tubesheet. The elastic design procedure uses a stress classification methodology to guard against failure due to gross plastic deformation. According to the design standards, mechanical stresses in the tubesheet due to tube-side and/or shell-side pressure are defined as the primary membrane and bending stress and are evaluated by comparing with allowable values of the primary stress. For the special type of heat exchanger, however, stresses in the tubesheet obtained by FEA are actually complex combination of primary and secondary stresses. Application of this conventional design approach to the FEA-calculated stresses in tubesheet may lead to over-conservative design. In helping to establish reliable and economical design of the tubesheet for such a special type of heat exchanger, authors conducted FEA investigation employing axisymmetric analysis model. Considering the geometric parameters, such as thickness of a tubesheet, heads type and shell dimension, the characteristics of tubesheet stresses was investigated and an appropriate stress classification was proposed.
Sponsorship	Pressure Vessels and Piping Division Nondestructive Evaluation Engineering Division
File Format	PDF
ISBN	9780791855676
DOI	10.1115/PVP2013-97255
Volume Number	Volume 3: Design and Analysis
Conference Proceedings	ASME 2013 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2013-07-14
Publisher Place	Paris, France
Access Restriction	Subscribed
Subject Keyword	Membranes Bending (stress) Deformation Shells Dimensions Heat exchangers Liquefied natural gas Pressure Stress Design Heat Finite element analysis Failure Refrigerants
Content Type	Text
Resource Type	Article

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