Corrosion-resistant self-priming pumps are pumps used to transport corrosive liquids. How to solve corrosion problems such as connection equipment, valves, flanges, and pipes of corrosion-resistant self-priming pumps? For pipelines, the basic problem of choosing corrosion-resistant material pipelines during paving is not a big problem, but it is different for valves and flanges. The integrity of flange connections is crucial to the pipeline system for conveying fluids. Whether it is a piping system that transports chemical media (such as hydrocarbons) or a water supply pipeline, flange connection leakage can cause serious environmental and economic impacts, and may even pose a huge safety hazard. If the flange is not protected and exposed to a corrosive environment or polluted industrial atmosphere, the corrosion rate will be very fast. In addition, due to the complex geometry of the flange connection, gap corrosion between the two flange surfaces and galvanic corrosion between different metals are prone to occur, which will seriously damage the integrity of the pipeline system. The following briefly introduces a solution to corrosion resistance Several practical methods for corrosion of suction pump flanges:
1. In order to meet the demanding production needs and reduce sudden shutdowns caused by leakage, effective monitoring and testing is necessary. Usually technicians are more concerned about the leakage between the flange faces, but ignore the protection of the fasteners and the outside of the pipeline, which may cause serious consequences in harsh external environments. Insufficient external protection will accelerate and expand the damage of flanges and fasteners, accelerate the deterioration of the entire sealing system, and may quickly destroy the structural integrity of the system and cause seal failure.
2. Since the visual inspection of the flange connection sealing surface can only be carried out when the whole system is shut down, the inspection procedure should be as simple as possible, so the external corrosion should be eliminated first. If the machine cannot be shut down, ultrasonic technology can only be used for detection. In the case of uncontrollable external corrosion, the process will be more complicated and accurate test results cannot be obtained. Therefore, external corrosion protection of flanges and fasteners is critical in order to monitor the entire system and provide effective and feasible quality control and repair procedures.
3. Existing solutions to corrosion-resistant self-priming pump flange corrosion problems
1) Polymer sealing bag solution
The sealing bag can wrap the flange*, and its composition is composed of low permeability polymer, corrosion inhibitor vapor and desiccant. It installs easily, but the ends of the bag are only sealed with tape rather than a durable, effective mechanical bond. There is a large area of steam space inside the bag, which is easy to accumulate a large amount of water, and the corrosion inhibitor will be consumed within a period of time.
2) Mechanical solutions
The gap between the flange and the flange surface is mainly sealed by a protective cover and a clamp, usually made of stainless steel or plastic with a rubber sealing strip. This form of protection is less flexible and requires storage of housings or clamps that are perfectly matched to flanges of various sizes.
3), adhesive tape or semi-solid anti-corrosion tape solution
Roll-packed tapes such as petrolatum tape, wax or elastic polymer wraps are protected by wrapping around the surface of the substrate. Due to the good water resistance of semi-solid polymers, this type of protection provides reliable corrosion protection.
4) Maintenance of paint solutions
Maintenance paint is a hard film that can be directly bonded to the substrate, usually an epoxy or polyurethane type coating. Flanges have many corners and edges, and due to the edge thinning effect, it is difficult for conventional paint systems to effectively cover the edges. Although a thicker coating will solve the problem of edge protection, it will also seal the fastener and prevent it from being disassembled for subsequent repairs. In addition, the coating is damaged when handling the bolts and must be recoated after repairs.
5) Solutions for hot melt plastics
Hot-melt plastic is essentially a waxy meltable polymer heated at high temperature, which is sprayed onto the surface of the substrate through professional hot-melt equipment. The advantage of this protection method is that it can be remelted and reused, saving costs. However, this method also requires hot work, professional equipment and construction services. Although it can be reused, it is not easy to open and seal during maintenance.
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