Feasibility of lining PP storage tanks with fiberglass-reinforced plastic
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This post was last edited by f9kx on 2017-7-3 09:52. The company has a 20-cubic-meter PP storage tank (with an inclined bottom and a slope of 3%) used to store materials containing approximately 5% hydrochloric acid； Currently, cracks have appeared at the bottom of the tank, causing leaks. The conventional repair method involves using PP welding rods for patching, but due to factors such as welding techniques and material aging, the effectiveness of this approach does not last long ； To reduce costs, and since the management does not want to replace the storage tanks (new fiberglass storage tanks of 20 cubic meters cost around 30,000 per unit), a repair solution was proposed: using fiberglass material for lining, with a thickness of 1–2 mm, and the lining to be installed on-site ； Lining location: back cover and 1m above the back cover. So questions arise: 1. Can fiberglass be bonded tightly to PP? 2. The shrinkage rates of the two materials are definitely different; will this ultimately lead to material delamination? Give it to the staff officer, Haiyou. Also, has anyone done this before, and what were the results?
Is the crack at the bottom of the tank in the PP plate itself or at the joint? In any case, it is certainly not caused by corrosion, but rather by cracking due to material aging or insufficient structural strength. Therefore, the focus for solving the problem is not corrosion prevention, but rather the structural strength/stiffness of the tank. Then your plan is futile. You should have used carbon steel + PP (lining) or tanks with fiberglass lining from the start.
For storage tanks made of pure PP, there are models with capacities of not only 20 cubic meters, but also 50 cubic meters and even 100 cubic meters; the strength of the material is no issue
The fiberglass lining is fine and can be used
Can’t even afford to buy a 3W tank? To resolve the issue completely, change the tank; those with a steel lining and PE coating can last for many years
It should be possible; we’ve used PP lining with fiberglass in the past to increase strength, which is the opposite of what you’re using here
Since it is a non-integral lining, the two materials need to be bonded tightly so as to prevent delamination； So the difference should be quite large. Thank you for providing the information! For safety reasons, we ultimately decided to switch to fiberglass tanks.
Replacing it with a fiberglass storage tank is a good solution that solves the problem once and for all
It’s possible to do it; I’m the manufacturer. Phone number: 18831836738