How to choose a gear pump when transporting media that solidifies at room temperature

When transporting media that solidifies at room temperature, specialized insulated gear pumps should be selected. The core design of these pumps enables continuous heating of both the pump body and the medium to prevent solidification during the transportation process. In addition to the core distinction of "requiring heating," you should also focus on the following key aspects during specific selection to ensure the pump operates reliably over the long term Key Points in Selection 1. Insulation Structure and Thermal Medium This is the most fundamental feature of the thermal insulation pump. The pump body is equipped with a hollow jacket, allowing the passage of steam, heat transfer oil, or hot water for heating. Select the appropriate heat medium and heating method based on your working conditions. 2. Medium Characteristics and Pump Materials Viscosity range: Insulated gear pumps are typically suitable for media with viscosities of 5 to 1,500 cSt. For higher viscosities (e.g., exceeding 1,500 cSt), a reduction gearbox is required to lower the rotational speed. Corrosion resistance: Select the pump body material based on the corrosiveness of the medium. · Non-corrosive media (such as asphalt or heavy oil): Optional materials include cast steel or Q235. · For corrosive or hygiene-sensitive applications (e.g., food, chemical raw materials): Stainless steel material must be selected. 3. Temperature and Power · Operating temperature: The commonly used heat preservation pumps are suitable for media temperatures ≤250°C. For higher requirements, some models can reach up to 350°C. · Preheat activation: Before startup, preheat the jacket with a heating medium to significantly reduce the starting power and protect the motor. Selection Reference for Different Application Scenarios To facilitate your quick decision-making, here are reference options for several typical media types: · Typical media: asphalt, heavy oil, paraffin wax Core requirements: Continuous insulation, high viscosity adaptation Selection criteria: Choose a jacketed thermal insulation gear pump; verify the inclusion of a reducer for extremely high viscosity. Material Selection: Cast steel can be selected in the absence of corrosive media. · Typical media: resins, adhesives, hot melt adhesives Core requirements: Precise temperature control, anti-solidification · Selection criteria: Ensure the jacket design meets the process temperature requirements; pay attention to the freezing point of the medium. · Material selection: Some adhesives may be corrosive; ensure proper verification. Typical media: food ingredients, pharmaceuticals, cosmetic base materials Core requirements: Hygienic material, corrosion-resistant, and easy to clean · Selection Key Points: Must use food-grade stainless steel material. Material selection: stainless steel. Installation and Operation Recommendations Installation Environment: Particularly suitable for outdoor installation in high-altitude cold regions. · Supporting piping: The inlet and outlet pipelines connected to the pump also require insulation measures to prevent the medium from cooling and solidifying in the pipes. · Backup Consideration: For critical processes requiring continuous 24-hour operation, it is recommended to install backup pumps. In summary, the key to selection lies in: confirming the medium properties (viscosity, corrosiveness) → choosing an insulation gear pump with corresponding material and structure → ensuring the heating system (jacket, heat medium) meets the process temperature requirements. If you can provide specific details such as the medium name, operating temperature range, and whether it is corrosive, I can offer you a more detailed selection analysis.