This is not a membrane ...

This is not a membrane failure, but rather a human installation error.  It looks like the person who installed the Hydranautics SWC5-LD membranes, also made the mistake of installing the thrust cone on the brine end 180 degrees in the wrong direction.  The big end of the cone needs to contact the outter edge of the ATD, not touching the perforated holes/spokes of the ATD.  Based on the failure it's evident this was not the case.  One can see when the system was started the axial thrust pushed the stack of membranes toward the brine end, this is due to the ATD spokes are only designed for preventing the membrane telescoping not stop the axial force of all the membranes in the vessel from moving.  When the ATD spokes failed, consequently the outer edge of the ATD separated from the FRP wrap as the upstream elements continued to drive the last unsupported element towards the endcap.  This is why you see a mushroomed core tube and the outter diameter of the element telescoped toward the endcap. 

Spin the thrust cone around to the correct direction and replace/reload all broken membranes in each vessel with this problem.  Once complete everything should work fine.

To avoid any additional risk you should check the brine end on all of your vessels to confirm the thrust cones were installed properly. For more info review the Wave Cyber manual for the proper loading and shimming instructions.  http://www.wave-cyber.com/Downloads.asp?ClassID=37