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11368 A Case History of a Large FRP Tank Fabricated in a TightPlace

Product Number: 51300-11368-SG
ISBN: 2011 11368 CP
Author: Terry W. Cowley
Publication Date: 2011
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A primary neutralization tank made of FRP (fiberglass reinforced plastic) was 30 years old and leaking from somewhere at the bottom. The vessel was open top with an 18 foot (5.5 m) diameter and 20.5 foot (6.25 m) straight shell. The vessel was surrounded by a metal structure, which supports the vessel's agitator, as well as, housing covering equipment used for the primary and secondary neutralization vessels. The vessel had to be replaced, but since the vessel was the first one to neutralize the waste stream, it could not be out of service for too long. The cost of removing the metal structure and replacing it would be very costly and require additional time. The question was how could the vessel be replaced without removing the metal structure?

Large FRP vessels have been fabricated in separate sections at fabricator shops, and sent to assembly sites for several decades. This paper describes the methods used to remove the old vessel and install and assemble the new vessel.

Keywords: FRP, fiberglass reinforced plastic, GRP, glass reinforced plastic, RTP, reinforced thermoset plastic, field fabricated, field assembled, waste water tank, FRP hot weld.
A primary neutralization tank made of FRP (fiberglass reinforced plastic) was 30 years old and leaking from somewhere at the bottom. The vessel was open top with an 18 foot (5.5 m) diameter and 20.5 foot (6.25 m) straight shell. The vessel was surrounded by a metal structure, which supports the vessel's agitator, as well as, housing covering equipment used for the primary and secondary neutralization vessels. The vessel had to be replaced, but since the vessel was the first one to neutralize the waste stream, it could not be out of service for too long. The cost of removing the metal structure and replacing it would be very costly and require additional time. The question was how could the vessel be replaced without removing the metal structure?

Large FRP vessels have been fabricated in separate sections at fabricator shops, and sent to assembly sites for several decades. This paper describes the methods used to remove the old vessel and install and assemble the new vessel.

Keywords: FRP, fiberglass reinforced plastic, GRP, glass reinforced plastic, RTP, reinforced thermoset plastic, field fabricated, field assembled, waste water tank, FRP hot weld.
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