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The Residual Strength of Breathing Air Composite Cylinders Toward the End of Their Service Life—A First Assessment of a Real-Life Sample

[+] Author and Article Information
Georg W. Mair

Division 3.2,
BAM Federal Institute of Materials
Research and Testing,
Unter den Eichen 44-46,
Berlin D-12203, Germany
e-mail: Georg.Mair@BAM.de

Irene Scholz

Division 3.2,
BAM Federal Institute of Materials
Research and Testing,
Unter den Eichen 44-46,
Berlin D-12203, Germany
e-mail: Irene.Scholz@BAM.de

Thorsten Schönfelder

Division 3.3,
BAM Federal Institute of Materials
Research and Testing,
Unter den Eichen 44-46,
Berlin D-12203, Germany
e-mail: Thorsten.Schoenfelder@BAM.de

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 25, 2015; final manuscript received June 8, 2016; published online July 18, 2016. Assoc. Editor: Pierre Mertiny.

J. Pressure Vessel Technol 138(6), 060906 (Jul 18, 2016) (10 pages) Paper No: PVT-15-1030; doi: 10.1115/1.4033878 History: Received February 25, 2015; Revised June 08, 2016

Applications by fire brigades expose the composite cylinders to harsh temperature and handling conditions. Standards have been used for certifying composite cylinders, which are designed for transport of dangerous goods and do not reflect service conditions specific to fire brigades. In this paper, the residual safety of a design type (fully wrapped with aluminum and carbon fiber composite) at the end of their service life of 15 yrs is analyzed. One sample underwent hydraulic load cycle (LC) tests, another conventional burst tests, and the third slow burst tests (SBTs). The statistical evaluation and the handling of an unexpected high amount of early failures are shown.

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References

Figures

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Fig. 1

LCT results (cycled at 2–45 MPa at RT); 25 specimens assessed as LND

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Fig. 2

LCT results (2–45 MPa at RT) of 25 specimens assessed as three-parametric WD

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Fig. 3

Modified best-fit straight lines for combined distribution; LCT 2–45 MPa at RT

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Fig. 4

Both groups of a sample displayed as separate samples with LND in GAUSSian probability net; LCT 2–45 MPa at RT

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Fig. 5

Both subsamples of the original sample assessed as separate samples; LCT 2–45 MPa at RT

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Fig. 6

Most basic version of a combined distribution (using LND in both cases); LCT 2–45 MPa at RT

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Fig. 7

Comparison of SR; various assessment approaches in LND net

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Fig. 8

Influence of sample size; chronologic development of test values

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Fig. 9

Results from 25 cylinders tested by conventional burst tests (BT: here 60 MPa/min) in ND net, two early failures

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Fig. 10

Results from 25 cylinders tested by SBTs (1.5 MPa/min) in ND net, with indication of possible separate fit of early failures

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Fig. 11

Three-parametric WD of the 25 cylinders tested by SBT procedure

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