Silo Design for Handling Purified Terephthalic Acid (PTA) BP Amoco Chemical - Gebeng, Malaysia The Need A client of Jenike & Johanson was expanding storage and handling capabilities for purified terephthalic acid (PTA). As part of the expansion, an existing silo would be retrofitted with a new mass flow transition hopper. The basis for the design of the new hopper was a similar hopper, designed and supplied by us that was handling the same material. This hopper had been performing as intended since it was installed more than 20 years ago. The design was sent out for bids but since its top diameter was only 10', the unit could be shop fabricated. Several pieces of existing equipment would have to be temporarily removed so that the new hopper could be installed. The estimated cost for r

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