In various paint coating construction, PPH storage tank The inner wall coating is different from the outer wall coating. In order to effectively ensure the quality, a complete set of procedures are provided for the coating of the tank inner wall.

Taking phenolic epoxy coating as an example, it is required that the dirt on the steel plate shall not be touched at the construction site, otherwise the coating on the inner wall of the tank will be damaged. Therefore, every effort must be made to keep the working area clean. This is a good way to keep the environment around the water tank inlet area clean. Before entering the cylinder, the foot sleeve can be passed first. Every construction link must be maintained and cleaned. During painting and construction, a shelter must be established to cover facilities and equipment.

During the construction, the generator and enough oil shall be prepared to ensure the operation of all construction equipment such as air compression lamps. The paint shall be stored under relatively low and high temperature conditions. Before and during construction, facilities must be established to ensure that the paint is stored at the correct temperature. The painted surface must be at least 3 ° C higher than the dew point temperature, and the primer shall be sprayed immediately after sand blasting. This state must be maintained during the tank coating construction to ensure the curing of the coating. In order to meet this requirement, if the single pipe feeding high-pressure airless spraying method is used for construction, airless spraying pump with large pressure ratio and suitable spray pipe length should be selected, and the total output liquid volume should be increased. Pressure to ensure smooth feeding and good atomization. Flow nozzle to ensure that the mixed paint can be used up during operation.

In addition, the viscosity of the coating is greatly increased due to the low temperature of winter construction. According to previous experience, it is significant to reduce the viscosity of epoxy resin by adding diluent. Therefore, try to store the paint indoors or preheat the paint properly during use, so that the temperature of the paint itself is not lower than 15 ℃, so as to increase the temperature of the paint to reduce the viscosity and meet the requirements of the paint. Spray, increase the pressure of the paint pump appropriately, and shorten the length of the paint hose as far as possible, so that the paint can be sprayed normally, and dehumidifier can be used.

As a guideline, the relative humidity zui during sand blasting should be well controlled at 40~60%. The dehumidification requirements depend on the specific construction environment and the type of paint actually used. During sand blasting, adequate ventilation must be provided to ensure visibility of safe work. After sand blasting, use flexible ventilation pipes to remove dust immediately. The ventilation system must prevent the concentration of solvent vapor in the storage tank from exceeding 10% of the lower explosive limit. PPH mixing tank

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