How to Choose a Mechanical Seal for Alkali Pump？

 Alkali pump is one of the essential equipment in many industrial applications. The selection of mechanical seals is crucial in the design and selection process of pumps. Mechanical seals play an important role in the performance, reliability, and safety of pumps. This article will explore the key factors in selecting a mechanical seal suitable for alkali pumps to ensure safe and reliable operation when handling alkali.

1. Characteristics of alkaline solution

Before choosing a mechanical seal, it is first necessary to understand the characteristics of the alkaline solution. Understand its pH value, temperature, concentration, and other chemical characteristics in order to select an appropriate mechanical seal. The properties of alkaline solution will affect the selection of sealing materials and the requirements for sealing performance.

1. Selection of sealing materials

For alkaline pumps, common mechanical sealing material options include:

a. Silicone Rubber – Silicone rubber is a common sealing material suitable for medium concentration alkaline liquids. It has good chemical resistance and heat resistance, and can be used in many industrial applications.

b. Polytetrafluoroethylene (PTFE) – PTFE is a corrosion-resistant material that has good resistance to most alkaline solutions. It has excellent chemical stability and low friction coefficient, suitable for high concentration and high temperature lye.

c. Fluoroelastomer – Fluoroelastomer is a high-performance sealing material that has good resistance to alkali solutions with high concentrations and strong corrosiveness. It has excellent chemical resistance and temperature resistance, suitable for alkaline solution treatment under extreme conditions.

Alkali pump

1. Selection of sealing type

When selecting a mechanical seal suitable for the alkali liquor pump, the appropriate seal type should be selected based on the actual application needs. The following are several common types of seals:

a. Single Mechanical Seal – Single Mechanical Seal is suitable for low to medium pressure and temperature applications. It consists of a sealing ring and a stationary ring, maintaining the sealing effect through pressure and lubricant.

b. Double Mechanical Seal – Double Mechanical Seal is suitable for high-pressure and high-temperature applications. It consists of two sealing rings and an intermediate chamber, achieving a dual sealing effect through pressure and lubricant, providing higher safety and reliability.

c. Bellows Mechanical Seal – Bellows mechanical seal is suitable for applications that require zero leakage. It has a flexible corrugated pipe structure that can withstand large axial displacement and provide reliable sealing performance.

When selecting a mechanical seal suitable for alkaline pumps, it is necessary to fully consider the characteristics of the alkaline solution, the corrosion and temperature resistance of the sealing material, and the applicability of the sealing type. Choosing a suitable mechanical seal can ensure the performance and reliability of the pump, and provide a safe operating environment. At the same time, regular maintenance and inspection of the operating condition of the mechanical seal is also an important link to ensure the long-term stable operation of the pump system. By comprehensively considering these factors, a mechanical seal suitable for the alkali pump can be selected to achieve safe and efficient fluid treatment.