Plasma Sprayed Ni-Al Coatings for Safe Ending Heat Exchanger Tubes

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Description

Brookhaven National Laboratory (BNL) has developed thermally conductive composite liners for corrosion and scale protection in heat exchanger tubes exposed to geothermal brine. The liners cannot withstand roller expansion to connect the tubes to the tubesheet. It is not possible to line the ends of the tubes with the same material after roller expansion due to the nature of the current liner application process. It was requested that BNL evaluate plasma sprayed Ni-Al coatings for safe ending heat exchanger tubes exposed to geothermal brine. The tubes of interest had an internal diameter of 0.875 inches. It is not typical to ... continued below

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38 p.

Creation Information

Allen, M.L.; Berndt, C.C. & Otterson, D. November 1, 1998.

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Description

Brookhaven National Laboratory (BNL) has developed thermally conductive composite liners for corrosion and scale protection in heat exchanger tubes exposed to geothermal brine. The liners cannot withstand roller expansion to connect the tubes to the tubesheet. It is not possible to line the ends of the tubes with the same material after roller expansion due to the nature of the current liner application process. It was requested that BNL evaluate plasma sprayed Ni-Al coatings for safe ending heat exchanger tubes exposed to geothermal brine. The tubes of interest had an internal diameter of 0.875 inches. It is not typical to thermal spray small diameter components or use such small standoff distances. In this project a nozzle extension was developed by Zatorski Coating Company to spray the tube ends as well as flat coupons for testing. Four different Ni-Al coatings were investigated. One of these was a ductilized Ni-AlB material developed at Oak Ridge National Laboratory. The coatings were examined by optical and scanning electron microscopy. In addition, the coatings were analyzed by X-ray diffraction and subjected to corrosion, tensile adhesion, microhardness and field tests in a volcanic pool in New Zealand.

Physical Description

38 p.

Notes

OSTI as DE00006133

Medium: P; Size: 38 pages

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  • Other Information: PBD: 1 Nov 1998

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  • Report No.: BNL-66149
  • Report No.: B& R #: EB-40-01
  • Grant Number: AC02-98CH10886
  • DOI: 10.2172/6133 | External Link
  • Office of Scientific & Technical Information Report Number: 6133
  • Archival Resource Key: ark:/67531/metadc695599

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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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  • November 1, 1998

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 12, 2017, 2:35 p.m.

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Allen, M.L.; Berndt, C.C. & Otterson, D. Plasma Sprayed Ni-Al Coatings for Safe Ending Heat Exchanger Tubes, report, November 1, 1998; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc695599/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.