Journal of Canadian Petroleum Technology
Volume 49,
Number 6,
June 2010,
pp. 8-12
Summary
The objective of this paper is the investigation and evaluation of the
performance and life expectancy of NPT threaded connections as applied to a
particular type of reciprocating compressor unit.
The study focused on the assessment of the levels of excitation forces
acting on the threaded connections and the resulting stress. These forces and
stresses were determined from field vibration measurement results applied to a
mechanical model of the system.
As an extensive literature search did not yield satisfactory data for
specific fatigue properties of NPT connections, we applied a first-principles
approach to the problem and calculated the stress concentration factors from a
detailed finite element study of the thread engagement under axial and
circumferential loads. The results and details are reported here.
Stress levels determined by this methodology were compared to the allowable
fatigue limits for the piping and valves materials and a life expectancy was
calculated.
The same methodology can be applied to other situations involving threaded
connections.
© 2010. Society of Petroleum Engineers
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History
- Original manuscript received:
29 March 2008
- Meeting paper published:
18 June 2008
- Revised manuscript received:
14 April 2010
- Manuscript approved:
15 April 2010
- Published online:
21 June 2010
- Version of record:
1 June 2010
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