Gasketed salt acid storage tank
Thread Content
A 500-cubic-foot carbon steel tank lined with rubber for storing salt acids (31%) was in use for 7 months when it was found that the internal rubber lining had peeled off and bulged, rendering it unusable. It was operated in an outdoor environment; the rubber lining consisted of two layers of natural rubber, each 3+3 mm thick. The manufacturer provided the rubber sheets that had already been vulcanized, but no further vulcanization was carried out after the installation was completed on site. What could be the reasons for the damage? Is there an issue with the material used for the adhesive sheets, or is there a problem with the quality of installation? The rubber-lined salt acid storage tank has been in use for many years and is now damaged; this is the first time such a thing has happened.
It’s likely a problem with the construction quality; sandblasting should be done before applying the rubber lining.
There were problems during the construction process; inadequate sandblasting for rust removal is the most likely cause, as well as poor adhesion between the rubber sheet and the steel shell. When applying the rubber lining, it is essential to ensure that the ambient temperature is above 13°C. If construction takes place in the winter in northern regions, appropriate insulation measures (such as indoor heating) must be in place, as low temperatures can also lead to poor adhesion. It can be said that in the case of problems with rubber linings, over 95% of them are caused by poor adhesion.
There is a high likelihood of construction quality issues; why choose 3+3, when 5 mm per layer is sufficient?
For the acid storage tanks used in on-site construction, rubber lining is employed as a method for corrosion protection. What specification of mixer would be suitable? What is the construction process?