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Research Papers: Operations, Applications and Components

Investigation of Adhesion Formation in New Stainless Steel Trim Spring Operated Pressure Relief Valves

[+] Author and Article Information
Julia V. Bukowski

Department of Electrical and
Computer Engineering,
Villanova University,
Villanova, PA 19085
e-mail: julia.bukowski@villanova.edu

Robert E. Gross

Savannah River Nuclear Solutions,
US-DOE Savannah River Site,
ms 704-2H,
Aiken, SC 29808
e-mail: robert.gross@srs.gov

William M. Goble

exida, LLC,
64 N. Main Street,
Sellersville, PA 18960
e-mail: wgoble@exida.com

This paper expresses measurements in English Engineering Units (EEU) throughout because the database utilized in this study has all information recorded in these units. Table 7, which is provided in the section Nomenclature, converts all values mentioned in the paper from EEU to International System of Units (SI).

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 7, 2013; final manuscript received February 28, 2014; published online September 4, 2014. Assoc. Editor: Kunio Hasegawa.The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States government purposes.

J. Pressure Vessel Technol 136(6), 061602 (Sep 04, 2014) (9 pages) Paper No: PVT-13-1110; doi: 10.1115/1.4026981 History: Received July 07, 2013; Revised February 28, 2014

Examination of proof test data for new (not previously installed) stainless steel (SS) trim spring operated pressure relief valves (SOPRV) reveals that adhesions form between the seat and disk in about 46% of all such SOPRV. The forces needed to overcome these adhesions can be sufficiently large to cause the SOPRV to fail its proof test (FPT) prior to installation. Furthermore, a significant percentage of SOPRV which are found to FPT are also found to “fail to open” (FTO) meaning they would not relief excess pressure in the event of an overpressure event. The cases where adhesions result in FTO or FPT appear to be confined to SOPRV with diameters less than or equal to 1 in. and set pressures less than 150 pounds per square inch gauge (psig) and the FTO are estimated to occur in 0.31% to 2.00% of this subpopulation of SS trim SOPRV. The reliability and safety implications of these finding for end users who do not perform pre-installation testing of SOPRV are discussed.

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References

Figures

Grahic Jump Location
Fig. 1

Conceptual representation of a typical SOPRV

Grahic Jump Location
Fig. 2

(a) Plot for SS+ SOPRV: Δf (lbf) versus diameter (in.) with ratio ranges distinguished. (b) Plot for SS+ SORVP: Δf (lbf) versus diameter ≤1.0 in. (enlargement of portion of Fig. 2(a)).

Grahic Jump Location
Fig. 3

Plot for SS Only SOPRV: Δf (lbf) versus diameter (in.) with ratio ranges distinguished

Grahic Jump Location
Fig. 4

(a) Plot for SS+ SORVP: Δf (lbf) versus set pressure (psig) <150 psig with ratio ranges distinguished. (b) Plot for SS+ SORVP: Δf (lbf) versus set pressure (psig) ≥150 psig with ratio ranges distinguished.

Grahic Jump Location
Fig. 5

(a) Plot for SS Only SOPRV: Δf (lbf) versus set pressure (psig) <150 psig with ratio ranges distinguished. (b) Plot for SS Only SOPRV: Δf (lbf) versus set pressure (psig) in range [150, 450] psig. (c) Plot for SS Only SOPRV: Δf (lbf) versus set pressure (psig) ≥550 psig.

Grahic Jump Location
Fig. 6

(a) Plot for SS+ SOPRV: set pressure (psig) versus diameter (in.) with ratio ranges distinguished. (b) Plot for SS+ SOPRV: set pressure (psig) <150 psig versus diameter (in.) ≤1 in. (enlargement of portion of Fig. 6(a)). (c) Plot for SS+ SOPRV: set pressure (psig) ≥150 psig versus diameter (in.) ≤1 in. (enlargement of portion of Fig. 6(a)).

Grahic Jump Location
Fig. 7

(a) Plot for SS Only SOPRV: set pressure (psig) <150 psig versus diameter (in.) ≤1 in. with ratio ranges distinguished. (b) Plot for SS Only SOPRV: set pressure (psig) ≥150 psig versus diameter (in.) ≤1 in.

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