How to choose a chemical process pump?
Release time:
2022-08-16
Source:
As a key piece of equipment in chemical engineering processes, chemical process pumps are receiving increasing attention. Due to the complex characteristics of chemical media and the continuously rising demands from users, how should we, as manufacturers, make our selections? What should we focus on? These questions are particularly important. Let's take a look at how to choose chemical process pumps. Below is a brief review of the selection of commonly used chemical pumps, hoping to assist colleagues in this field in their work.
As a key equipment in chemical engineering processes, chemical process pumps are receiving increasing attention. Due to the complex characteristics of chemical media and the continuously rising demands from users, how should we, as manufacturers, make our choices? What should we focus on? These questions are particularly important. Let's take a look at how to select chemical process pumps and provide a brief review of the selection of commonly used chemical pumps, hoping to assist colleagues in this field in their work.
1. Cooling Issues of Chemical Process Pumps
The transportation of high-temperature media imposes higher requirements on the structure, materials, and auxiliary systems of the pump. Let's discuss the cooling requirements for different temperature changes and the applicable pump types for the company:
1. For media with temperatures below 120°C, a dedicated cooling system is usually not set up; instead, the medium itself is used for lubrication and cooling. For media that are prone to crystallization or contain particles, a flushing pipeline for the sealing surface should be equipped.
2. For media with temperatures above 120°C and below 300°C, a cooling chamber should generally be set within the pump cover, and the sealing chamber should also be connected to a coolant. When it is not allowed for the coolant to enter the medium, it should be cooled using its own medium.
3. For high-temperature media above 300°C, not only does the pump head need cooling, but the suspended bearing chamber should also be equipped with a cooling system. The pump structure is generally of a center support type, and mechanical seals use metal bellows type, although they are more expensive.
2. Sealing Issues of Chemical Process Pumps
Leak-free operation is an eternal pursuit in chemical equipment, and this requirement has led to the increasing expansion of magnetic pumps and shielded pumps. The lifespan of magnetic pump isolation sleeves and shielded pump shielding sleeves, material corrosion issues, and static sealing reliability are as follows:
1. The sealing form is static sealing, which usually consists of only gaskets and sealing rings; sealing rings and O-rings are widely used. For dynamic sealing, packing seals in chemical pumps are rarely used; mechanical seals are primarily used, which can be single-sided or double-sided. Balanced types are suitable for sealing high-pressure media; double-end face sealers are used for high-temperature and toxic volatile media that may include particles; double-end face machine seals should have sealant injected into the sealing chamber.
2. The sealing materials for static seals in chemical pumps generally use fluororubber; in special cases, polytetrafluoroethylene materials are used. The material configuration of mechanical seal rings is critical; it is not just hard alloy for hard alloy; on one hand, it is expensive, and on the other hand, having no hardness difference is also unreasonable. Therefore, it should be treated differently based on the characteristics of the medium.
3. Corrosion Resistance Issues of Chemical Process Pumps
For a long time, corrosion has been one of the major hazards in chemical equipment; a slight oversight can lead to equipment damage or even accidents that may result in disasters. When selecting chemical pumps, attention must be paid to the scientific selection of materials.
Chemical process pump
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