Almost all industrial processes involving liquids are used in one of the stages of the pump. Regardless of the pump design or size, the key to each application is reliability and efficiency. Minimizing downtime and running costs is critical to modern industry. The diaphragm gauge pump manufacturer introduces the causes of corrosion and abrasion today.

For those who use large industrial pumps, the special challenges they face are two things:

First, it usually works under harsh conditions.

Second, maintain the pump's excellent performance while continuously subjected to corrosion and abrasion threat.

With the increasing understanding of these production processes and the techniques used to solve the problems in the production process, users are able to implement more cost-effective pump renovations.

corrosion

The chemical reaction between the surface of the part and the reaction fluid that flows through the pump is usually defined as corrosion. Corrosion is usually divided into two categories, generally or even corrosion, and local corrosion, such as pitting and crevice corrosion. Non-stainless steel materials are mainly affected by uniform corrosion, while those metals that form oxide layers adhere to the surface and make the surface passivate are prone to local corrosion.

Flow accelerated corrosion (FAC) refers to the removal of protective oxide layers on metal surfaces. The speed of the process is affected by the amount of oxygen, the velocity and the amount of chlorine. The calcium layer formed by the high carbonate hardness of the water can weaken or even prevent the FAC.

The effects of oxygen can be seen from the following examples: in water with oxygen content below 20 PPB (a billionth of a billionth), the flow rate is about 15 m/s, and the rate of corrosion is usually about 0.01 mm/year. However, when the oxygen content increases, the rate of corrosion will increase to a few millimeters per year, which will pose a significant challenge to industrial production.

Fortunately, the FAC only creates real problems for low carbon steel and cast iron. Increasing chromium content or using stainless steel will greatly eliminate the vulnerability of flow accelerated corrosion.

abrasion

When used to transmit liquid containing abrasion material such as sand, the pump suffers severe abrasion, especially in areas with high velocity of flow. In the oil and gas industry, the phenomenon in these applications, often use to force water injection pump back into field, thus maintaining the oil required to ascend to the surface pressure. The abrasive particles in the water flow can cause wear and tear on the pump, while high working pressure makes the abrasion problem worse.

From a purely design standpoint, the pump manufacturer in this area has the following two options for minimizing abrasion:

• reduce the flow rate of each part of the pump

• the pump is designed in such a way that the flow of liquid flows through the clearance of the closed operation is low.

In most cases, however, the specification required by the application limits the implementation of any of the above solutions. In these applications, the practicable solution is to apply a coating with high abrasion resistance to the selected area of the pump.