You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.


    Acoustic Emission Testing of Steel-Lined FRP Hoop-Wrapped NGV Cylinders

    Published: 0

      Format Pages Price  
    PDF (552K) 20 $25   ADD TO CART
    Complete Source PDF (5.6M) 248 $55   ADD TO CART

    Cite this document

    X Add email address send
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word


    Acoustic emissions (AE) were examined from ten steel-lined cylinders, hoop-wrapped with continuous glass fiber reinforced plastic (FRP), after 4 years in natural gas vehicle (NGV) service. A test pressure of 27.6 MPa (4000 psi) was used which is 7% above the standard specified factor of 1.25 of the nominal service pressure. Hydraulic pressure cycling was applied in the range of 2.4–24.1 MPa (350–3500 psi) to simulate refueling in the laboratory. Burst pressure was measured for vessels containing no detectable flaw, with flaws in the FRP and cracks in the metallic liner. It was found that visual examination has shortcomings for the inspection of hoop-wrapped cylinders. AE data obtained through incremental pressurization to 27.6 MPa (4000 psi), holding pressure for 5 minutes, and unloading, do not provide useful information on structural integrity. Relative emission during two consecutive pressurization cycles holds promise for the nondestructive evaluation of metal lined FRP hoop-wrapped cylinders.


    acoustic emission testing, visual inspection, continuous fiber reinforced plastic, metal lined FRP hoop-wrapped cylinders, natural gas vehicle, structural integrity

    Author Information:

    Akhtar, A
    DirectorAdjunct Professor, Materials Engineering, Powertech labs Inc.Metals & Materials Engineering, University of B.C., SurreyVancouver,

    Kung, D
    Senior Materials Technologist, Powertech Labs Inc., Surrey,

    Committee/Subcommittee: E07.04

    DOI: 10.1520/STP15792S