Depamu Twin Screw Pump for Hygienic Applications

Introduction

In the hygienic processing industries—spanning food and beverage, dairy, pharmaceuticals, and cosmetics—the selection of pumping equipment is a critical decision that directly impacts product quality, operational efficiency, and regulatory compliance. The DEPAMU Twin Screw Pump emerges as a sophisticated solution engineered to meet the rigorous demands of these sectors. This article provides a comprehensive examination of the DEPAMU twin screw pump's design principles, hygienic credentials, operational capabilities, and diverse applications, establishing its value proposition for modern hygienic processing environments.

The Twin Screw Principle: A Foundation for Hygienic Performance

The DEPAMU sanitary stainless steel twin screw pump operates on the positive displacement principle, utilizing two intermeshing screws to move fluid axially through the pump casing. This design inherently offers several advantages critical for hygienic applications. Unlike centrifugal pumps, which can impart high shear forces that damage delicate products, the twin screw mechanism provides gentle, pulsation-free flow. This characteristic is particularly valuable when handling shear-sensitive products such as yogurt containing fruit pieces, salad dressings with particulates, or pharmaceutical emulsions where maintaining formulation integrity is paramount.

Furthermore, the pump's ability to handle fluids across an extraordinary viscosity range—from 1 cP, comparable to water, up to 1,000,000 cP—demonstrates remarkable versatility unmatched by many competing technologies. This broad operating envelope enables facilities to standardize on a single pump type for diverse product lines, reducing spare parts inventory and maintenance complexity.

Hygienic Design and Certifications

Material Excellence

The foundation of hygienic pump design is material selection. DEPAMU's hygienic twin screw pumps feature wetted parts constructed from AISI 316L stainless steel, a material widely recognized for its excellent corrosion resistance, durability, and compatibility with cleaning protocols. This metallurgical choice ensures that the pump can withstand the harsh conditions of Clean-in-Place (CIP) procedures, including exposure to caustic solutions, acidic cleaners, and elevated temperatures, without degradation that could compromise product purity.

Surface Finish and Design Details

Surface finish quality is paramount in hygienic applications, as rough surfaces can harbor microorganisms and resist effective cleaning. The DEPAMU pump achieves surface finishes better than Ra 0.8 micron on all product-contact surfaces, meeting the stringent requirements of industry standards. This smooth finish minimizes bacterial adhesion, facilitates complete cleaning, and reduces the risk of cross-contamination between product batches.

The pump's hygienic design philosophy extends beyond material selection to incorporate features such as:

• Dead space elimination: The pump design eliminates crevices and dead zones where product could accumulate and become a breeding ground for bacteria

• Self-draining configurations: Properly oriented installations allow complete drainage, preventing product retention

• Sanitary connections: The pump accommodates various industry-standard connections including DIN 11851, DIN 11864, Clamp fittings, SMS, and RJT configurations

Certification Framework

DEPAMU's hygienic twin screw pumps are designed for compliance with the most rigorous global hygiene standards. The pumps can be supplied in executions compliant with:

• 3-A Sanitary Standards: The preeminent US standard for dairy and food processing equipment hygiene

• EHEDG (European Hygienic Engineering & Design Group): The European authority on hygienic equipment design

• FDA regulations: Ensuring materials meet requirements for food contact applications

• EC 1935/2004: The European framework regulation for materials and articles intended to come into contact with food

These certifications provide processors with assurance that the DEPAMU pump meets the hygiene requirements demanded by regulators, auditors, and increasingly discerning consumers.

The Product-CIP Dual Functionality

One of the most compelling features of the DEPAMU twin screw pump for hygienic applications is its ability to serve dual roles: product pump and CIP supply pump. This capability, shared by leading hygienic twin screw pump designs, offers significant operational advantages.

Operational Principle

The pump's wide speed range—extending to 3,600 rpm in cleaning mode compared to lower speeds for product transfer—enables it to function effectively as a CIP pump without requiring a separate centrifugal unit. During product transfer, the pump operates at lower speeds appropriate for gentle handling. During cleaning cycles, the speed is increased to generate the flow velocities necessary for effective cleaning-in-place.

Economic and Spatial Benefits

This dual functionality delivers substantial economic advantages:

• Capital cost reduction: Eliminates the need for a dedicated CIP supply pump

• Space optimization: Removes the requirement for additional bypass piping and valving, valuable in space-constrained production areas

• Simplified system design: Reduces engineering complexity and potential failure points

• Operational flexibility: Enables cleaning sequences to be initiated without switching between pumps

Self-Cleaning Effect

The twin screw design itself contributes to cleaning effectiveness. The rotating screws create a self-cleaning effect, particularly at elevated speeds, that helps dislodge and sweep away product residues. This characteristic, combined with the smooth surface finish and elimination of dead spaces, ensures that the pump can be effectively cleaned without disassembly in most applications.

Operational Versatility Across Applications

Food and Beverage Processing

The DEPAMU twin screw pump's gentle handling and broad viscosity capability make it suitable for numerous food processing applications:

• Dairy products: Yogurt, quark, cream, butter, pudding, soft cheeses, and melted cheese

• Beverages: Fruit juices, concentrates, wine, and syrups

• Confectionery: Chocolate, liquid sugar, fudge, cream, and filling preparations

• Sauces and condiments: Ketchup, mayonnaise, mustard, salad dressings, and soups

• Meat processing: Sausage meat and minced meat products

• Oils and fats: Edible oils and greases

The pump's ability to handle products with suspended solids without damaging the integrity of fruit pieces, nuts, or other inclusions makes it particularly valuable for premium product lines where visual appeal and texture are critical quality attributes.

Pharmaceutical and Cosmetic Applications

The same gentle handling characteristics that benefit food processing make the DEPAMU twin screw pump ideal for pharmaceutical and cosmetic applications:

• Pharmaceutical raw materials: Active ingredients and excipients

• Personal care products: Shampoos, conditioners, and liquid soaps

• Cosmetics: Creams, lotions, and ointments

• Bio-pharmaceutical fluids: Sensitive biological products requiring minimal shear

In these applications, the pump's ability to maintain product integrity during transfer is complemented by the hygienic design features that prevent contamination, meeting the stringent quality requirements of the pharmaceutical industry.

Technical Specifications and Configurations

Performance Parameters

The DEPAMU twin screw pump, similar to industry-leading designs such as NETZSCH's NOTOS series, is available in multiple sizes to accommodate various flow requirements. While specific DEPAMU model details are limited in available documentation, comparable hygienic twin screw pumps offer:

• Flow rates: From as low as 11 m³/h to over 300 m³/h, depending on model and configuration

• Differential pressure: Up to 25 bar in standard configurations, with higher pressure capabilities available in specialized executions

• Temperature range: From -20°C to 165°C, accommodating both cold products and hot process fluids

• Particle handling: Capability to pass solid particles up to 30mm, depending on model selection

Customization Options

Recognizing that hygienic applications are diverse and often application-specific, the DEPAMU pump platform offers various customization options:

• Screw profile selection: Different screw geometries optimized for high flow, high pressure, or delicate product handling

• Seal configurations: Single, flushed, or double mechanical seals, with hygienic cartridge-style seals for easy maintenance

• Heating/cooling jackets: For temperature-sensitive products requiring precise temperature control during transfer

• Mounting options: Close-coupled or baseplate mounted configurations

• Surface finishing: Enhanced polishing options for ultra-hygienic applications

Conclusion

The DEPAMU Twin Screw Pump represents a comprehensive solution for hygienic processing applications. Through its combination of gentle positive displacement pumping action, robust AISI 316L stainless steel construction, superior surface finishes, and compliance with international hygiene standards, it addresses the core requirements of food, beverage, dairy, pharmaceutical, and cosmetic processors.

The pump's ability to serve as both product transfer and CIP supply pump delivers tangible operational and economic benefits, while its broad viscosity and temperature capabilities enable standardization across diverse product lines. As hygienic processing requirements continue to evolve toward higher standards of safety and efficiency, the DEPAMU twin screw pump stands as a technology capable of meeting both current needs and future challenges