Container assembly for flowable materials

A method for storing and releasing flowable materials, the method comprising:

• providing a container assembly comprising:
• a reusable outer supporting container;
• and
• a disposable inner plastic liner;
• wherein the reusable outer supporting container comprises an outlet pipe comprising a first outlet pipe section connected to the reusable outer supporting container and a second outlet pipe section releasably connectable to the first outlet pipe section, wherein the second outlet pipe section comprises a valve for selectively closing off the second outlet pipe section, and wherein at least one of the first outlet pipe section and the second outlet pipe section comprises an annular recess;
• and
• wherein the disposable inner plastic liner comprises a tubular outlet portion, wherein the tubular outlet portion comprises an outer flange configured to be captured between the first outlet pipe section and the second outlet pipe section, and further wherein the outer flange of the tubular outlet portion comprises an annular protrusion configured to be received in the annular recess when the outer flange is captured between the first outlet pipe section and the second outlet pipe section;
• positioning the disposable inner plastic liner within the reusable outer supporting container, with the tubular outlet portion of the disposable inner plastic liner being disposed within the outlet pipe so that the outer flange of the tubular outlet portion is captured between the first outlet pipe section and the second outlet pipe section, and with the annular protrusion of the disposable inner plastic liner being received in the annular recess of the outlet pipe;
• loading flowable material into the disposable inner plastic liner while the valve of the outlet pipe is closed;
• and
• releasing the flowable material from the disposable inner plastic liner by opening the valve of the outlet pipe.