January 2012

Engineering Case Histories

Case 66: Fiberglass mixing tank flexing vibration

The design of fiberglass and polymer tanks had many problems in the 1980s. Most of these problems were resolved with experience, new materials and manufacturing techniques, along with new national con..

Sofronas, T., Consulting Engineer

The design of fiberglass and polymer tanks had many problems in the 1980s. Most of these problems were resolved with experience, new materials and manufacturing techniques, along with new national construction standards. Such tanks are now considered quite reliable. Problems. However, operating problems do continue to pop up with fiberglass tanks, as was the case when the following analysis was done. In this application, a prototype fiberglass tank was designed to mix caustics in a small pilot plant. The mixer was mounted on a separate structure and was not in contact with the tank. This tank vibrated at a low frequency and developed stress cracks within the vicinity of the mixer blades a

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