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Glass-lined reactor and its welding procedure

Glass-lined reactor and its welding process points (technical standards)


Zibo Tanglian Chemical Equipment Co., Ltd. analyzes the points in the welding process of enamel glass equipment (technical standards)


The glass-lined reaction vessel is a very common type of equipment used in chemical production. It is characterized by spraying silicate powder on the inner wall of common carbon steel vessels, and then firing it at about 1000°C to make it tightly adhere to the surface of the steel substrate. The resulting silicate layer is commonly known as enamel or enamel glass. Because enamel and Q235 steel plates have similar thermal expansion rates, they can withstand a certain amount of thermal shock during chemical production. As we all know, enamel has good acid and alkali resistance, and it is widely used because it has a lower cost than pure stainless steel products of the same specifications.

The glass-lined reaction vessel is to be burned at 600°C after completion of the steel billet, and the oxide and the surface area are removed by grinding and sandblasting. After repeated spraying and firing for 3-4 times, a 20,000V high is required after completion. Piezoelectric spark test to detect pinhole conductive points and repair. In the meantime, more than enough firing (commonly known as burning) or gas within the weld breaks through the enamel (commonly known as the electric welding bubble) two major defects. In order to improve the yield during the enamel firing process, we made some adjustments during welding, briefly described as follows:

In the past, the residual height of submerged arc welded joints was up to 2-3 mm. In this way, the surface of the grinding wheel was formed into an arc groove during the grinding process. When the next workpiece was processed, both sides of the weld joint were ground. , After the dusting, burning, powder accumulation area due to insufficient temperature accumulation, and the formation of "burning." After the customer puts the product into use, under the action of alternating load, the surface enamel in the powder accumulation area is extremely fragile, and lacks the support of the steel plate, and is most likely to be cracked, which is the common saying “blasting porcelain”. Unfired "powder" does not have any anti-corrosion ability, so that the material directly penetrates the powdered area, corrodes the steel plate substrate, and destroys the container.

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