Defects in the manufacturing process of reaction vessels

(1) Confused the concepts of overall volume and nominal volume. Usually, the overall volume of the equipment refers to all the spaces contained in the reactor cylinder and upper and lower seals, and the nominal volume is only the volume corresponding to the jacket of the kettle body, which is the feeding volume. Obviously, the latter is smaller than the former. Usually, users require a nominal volume based on the amount of material to be fed, but the vast majority of manufacturers use the full volume to calculate it. When users don't care, they can take advantage of it. When users see it, they can pretend to misunderstand. There is a defense reason. However, its harm is that when users are unaware, they exceed the loading factor, feed too much, and cause reactor overload. The danger is self-evident.

(2) Improper configuration of reducer. In cases where high requirements are placed on shaft seals, mechanical seals should be chosen for reducers with smaller shaft swings. Some manufacturers may use turbine reducers with relatively lower prices, but due to larger shaft swings, the mixing shaft swings, causing the mechanical seal to fail due to working conditions that cannot be guaranteed. When the kettle is under pressure, the shaft seal leaks more severely. If the kettle is flammable. Explosive. deleterious. Corrosive medium. The harm can be imagined.

(3) In order to ensure the stability of the transmission device, the base with thin structure and poor rigidity on the kettle cover should be simplified into a platform. In addition to being used on low-speed reactors, it is easy to cause stirring shafts on commonly used reaction reactors. The deceleration frame and motor shake. Causing shaft seal failure, material leakage, and wear of equipment moving parts.

(4) If the kettle body is forcibly thinned, especially for expensive stainless steel plates, this operation is considered high-risk. Due to the reduced pressure resistance and stiffness of the kettle body, it can cause a catastrophic accident of equipment explosion.

(5) The reducer frame is too short, there is no space to adjust the mechanical seal and test the pulley. Generally speaking, when replacing vulnerable parts of mechanical seals, it is necessary to disassemble the gearbox and motor, which is very inconvenient. When the reducer frame is long enough, only the test pulley needs to be disassembled, and the rest does not need to be moved. Although short racks save manufacturers or users some manufacturing costs, the time cost for users to maintain equipment in the future often greatly exceeds the cost savings. At least for users, calculating general ledger or long-term accounts is not cost-effective.

(6) To save materials, the head does not press the straight edge, resulting in a decrease in head stiffness and equipment capacity.

(7) There is no positioning bearing in the middle of the gearbox frame. If the stirring shaft swings too much, it will cause the shaft seal to fail.

(8) If the flange raw material is simply thinned, causing deformation before reaching the rated load, it will ultimately lead to the failure of the flange surface sealing. Even if harmless media suddenly fail at high temperatures, it can cause serious consequences, even harmful media.

(9) If the mixing shaft and the output shaft of the reducer are different, or if the bottom bearing and the reducer frame are not on the same axis, it will cause the mixing shaft to become stiff and swing. The service life of the bottom bearing is also reduced due to wear, and the shaft seal fails.

(10) If the inner wall of the reactor is not polished, it will become rough, prone to rust and scaling, making it difficult to clean during early use or product replacement.