Forces on a pipe bend resulting from clearing a pool of liquid upstream

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The forces experienced by a bend in a pipe when a pool of water upstream is cleared by a rush of air have been measured. These forces are found to be negligible as long as a transition to slug flow does not occur. This transition does not occur as long as the maximum liquid fraction in the pool is less than 20%. The forces experienced at the bend are greatly reduced if the slug has traveled more than 6 L/D's, a distance which is more than sufficient to insure that the slug has entrained air. The effect of an upstream ... continued below

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Pages: (22 p)

Creation Information

Neumann, A. (Schlumberger Technology Corp., New York, NY (United States)) & Griffith, P. (Massachusetts Inst. of Tech., Cambridge, MA (United States)) January 1, 1991.

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Description

The forces experienced by a bend in a pipe when a pool of water upstream is cleared by a rush of air have been measured. These forces are found to be negligible as long as a transition to slug flow does not occur. This transition does not occur as long as the maximum liquid fraction in the pool is less than 20%. The forces experienced at the bend are greatly reduced if the slug has traveled more than 6 L/D's, a distance which is more than sufficient to insure that the slug has entrained air. The effect of an upstream expansion on the force experienced by the bend as a cleared air-water plug passes through it has also been measured. A conservative estimate of the maximum force can be made by assuming that the plug is composed entirely of liquid and moves at the mixture velocity characteristic of the small pipe. The measured maximum force decreases rapidly with increasing distance. These measurements will help in designing piping supports for lines which cannot be properly sloped or are downstream of a pressure relief valve. 2 refs.

Physical Description

Pages: (22 p)

Notes

OSTI; NTIS; GPO Dep.

Source

  • American Society of Mechanical Engineers pressure vessel and piping conference, New Orleans, LA (United States), 21-25 Jun 1992

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  • Other: DE92004179
  • Report No.: CONF-920631-3
  • Grant Number: FG07-88ER12822
  • Office of Scientific & Technical Information Report Number: 5611494
  • Archival Resource Key: ark:/67531/metadc1093118

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • January 1, 1991

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

Description Last Updated

  • Feb. 26, 2018, 5:38 p.m.

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Neumann, A. (Schlumberger Technology Corp., New York, NY (United States)) & Griffith, P. (Massachusetts Inst. of Tech., Cambridge, MA (United States)). Forces on a pipe bend resulting from clearing a pool of liquid upstream, article, January 1, 1991; United States. (digital.library.unt.edu/ark:/67531/metadc1093118/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.