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Development and application of thermal control coatings for simulated hazardous chemical liquid storage tank
Pages: 417-420
Year: Issue:  10
Journal: Electroplating & Finishing

Keyword:  hazardous chemical liquidstorage tankthermal control coatingreflectionbarrierthermal insulationcorrosion protection;
Abstract: A thermal control coating system was designed for liquid storage tank as epoxy micaceous iron oxide primer (50-60 μm) + rigid polyurethane foam thermal insulation coating+grid enforcement layer+transition layer (0.5 cm)+heat reflective topcoat (50-60 μm). The effect of the thickness of heat insulation polyurethane coating on the thermal insulation of a 20 L coated barrel was studied. The suitable thickness was determined as 5 cm, achieving the integration of corrosion protection, thermal barrier, and heat reflection. The adhesion of adjacent layers, compressive strength, high and low temperature alternating resistance,and salt spray corrosion resistance of the composite coating were tested. The thermal control performance of the simulated 13 m3 and 40 m3 chemical liquid storage tanks coated with the composite coating was examined, as compared with the fire equipment shed near the storage tanks. The results showed that the adhesions strength of the steel sheet to primer and the transition layer to the heat reflective layer are grade one, and those of the primer to the thermal insulation layer and the thermal insulation layer to the transition layer are 6.3 MPa and 5.2 MPa, respectively. The surface of the composite coating showed no bubbling and peeling in salt water resistance test and salt spray test. The composite has a compressive strength about 0.35 N/mm2, and is smooth, leveled, and crack-free after high and low temperature alternating for 10 cycles. The performance of the composite coating meets the working environment requirement of storage tanks. In thermal control property test, the temperature change of water in 13 m3 and 40 m3 storage tanks was within 4 °C when the temperature inside the fire equipment shed varied between 20 °C to 42 °C. The composite coating structure shows good thermal insulation effect.
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