Chemical Pump Encyclopedia

Choosing the Right Diaphragm Pump: Plastic vs. Metal

diaphragm pump

Diaphragm pumps, as a kind of fluid transfer equipment widely used in various industrial applications, the selection process has a direct impact on productivity and operating costs. However, the selection of diaphragm pumps is not an easy task. Improper selection not only leads to equipment damage, but also may cause production downtime.

Material selection is especially crucial in the diaphragm pump selection process, as pumps made of different materials have significant performance and application environment differences. Choosing the right material can not only extend the pump’s lifespan but also ensure safe and stable operation. This article will take a deeper dive into diaphragm pump material selection issues to help you choose the most suitable diaphragm pump and achieve efficient applications!

Features and Applications of Plastic and Metal Diaphragm Pumps

Metal Diaphragm Pumps: Durable for Harsh Environments

Metal diaphragm pumps are known for their outstanding robustness and durability, especially for the oil, gas and chemical industries. Metal pumps are typically made from materials such as stainless steel and aluminum, and have the following characteristics and applications:

  • Stainless steel pumps: This material has excellent corrosion resistance suitable for food and hygiene applications. We once cooperated with a large food processor to select stainless steel diaphragm pumps to resolve their production line issue of conveying highly acidic liquids, greatly improving production efficiency and product safety.
  • Aluminum pumps: Aluminum pumps are not only durable but also cost-effective, widely used in industrial fields. A coating plant adopted QEEHUA PUMP’s aluminum diaphragm pumps, successfully lowering equipment maintenance costs and enhancing production stability.

Metal diaphragm pumps specifically handle abrasive liquids and high-viscosity liquids (such as sludge). They also meet the ATEX standard for installations requiring grounding or use in potentially explosive environments, ensuring safety. For example, in a petrochemical plant application, metal diaphragm pumps effectively solved the safe transportation of flammable gases and complied with relevant safety regulations.

Plastic Diaphragm Pumps: Strong Chemical Compatibility at Lower Costs

Plastic diaphragm pumps are popular due to their high chemical compatibility and relatively lower costs. Common plastic materials include polypropylene (PP) and polyvinylidene fluoride (PVDF) with broad applications:

  • Polypropylene pumps: The ideal choice for handling corrosive chemicals. A chemical company once selected QEEHUA PUMP’s polypropylene diaphragm pumps for processing highly corrosive acidic liquids, not only resolving corrosion issues but also significantly extending equipment lifespan.
  • PVDF pumps: Suitable for handling even more caustic fluids like strong acids and bases. A semiconductor company used PVDF diaphragm pumps for processing high-purity chemicals, successfully avoiding chemical reactions damaging the pump body and ensuring production continuity and product purity.

An additional major advantage of plastic diaphragm pumps is their light weight and ease of transport along with relatively lower prices. For some budget-constrained projects involving SMEs or start-ups, plastic diaphragm pumps provide a high value solution. However, their applicability in outdoor environments is more limited, especially under extreme temperatures or UV radiation exposure prone to damage.

Select the Right Material Based on Specific Application Needs

Selecting diaphragm pump materials must involve evaluating specific application requirements. Key factors include:

  • Fluid type and properties
    • Corrosiveness: Corrosive fluids require corrosion-resistant materials like stainless steel or polypropylene.
    • Abrasiveness: Abrasive fluids containing solid particles are better suited for metal pumps to reduce wear.
    • Viscosity: High viscosity fluids require specially designed pumps to ensure smooth transportation.
  • Environmental conditions
    • Temperature: Metal pumps have an advantage in withstanding temperature variations in high heat environments.
    • Installation conditions: Metal pumps meet safety standards where grounding is needed to ensure operational safety.
  • Industry demands
    • Certification requirements: Food and pharmaceutical industries require pumps certified to standards like FDA.
    • Safety regulations: Oil and gas industry needs pumps certified for explosive environments per ATEX.

Some recommendations:

  • Select corrosion-resistant materials like stainless steel or PVDF for corrosive media.
  • Choose pumps with suitable structures and power configurations for high viscosity media to ensure adequate transportation capacity.
  • Opt for materials with high strength and heat resistance like stainless steel for high pressure or high temperature applications.
  • Consider plastic diaphragm pumps’ limitations in temperature tolerance and corrosion resistance when budgets are constrained.

QEEHUA PUMP: Your Diaphragm Pump Expert

Price is an important consideration when purchasing diaphragm pumps, with significant variations between materials, specifications, and brands. Generally metal pumps cost more due to higher material costs than plastic pumps. Prices also depend on technical parameters like flow rates and pressures.

Selecting a competent diaphragm pump supplier is equally key. As a leading chemical pump manufacturer, QEEHUA PUMP offers high-quality diaphragm pump products covering a wide range of applications certified by ISO9001, ISO14001, CE, SGS and more, ensuring reliability and safety. Additionally, QEEHUA PUMP’s professional team of sales, engineering, and after-sales support staff provide comprehensive technical assistance and services.

High quality diaphragm pump suppliers

Contact QEEHUA PUMP for a tailored solution that meets your unique requirements. Experience reliability and efficiency with their pumps.

In conclusion, carefully examining all factors impacting performance and reliability is essential when purchasing a diaphragm pump tailored to your specific application needs. Double diaphragm pumps stand out for their versatility and suitability for various industrial uses. However, considering the above key issues is crucially important to ensure optimal operation and durability.

Both plastic and metal diaphragm pumps have their pros and cons suited for different scenarios. Select the right material and model according to fluid type, environmental conditions, and industry demands to significantly boost production efficiency and lower operational costs. With its extensive product lines, outstanding technical performance, and comprehensive after-sales support, QEEHUA PUMP provides reliable diaphragm pump solutions for customers. This article aims to provide valuable reference for your diaphragm pump selection process to help you find the best fluid handling solution.


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