INDUSTRIAL BASKET STRAINER

Introduction

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PMG Vol .02-Issue .38-October The presence of physical contaminants can cause significant issues in food manufacturing industries. Therefore, food technologists and engineers often implement devices like sifting equipment, magnet traps, basket strainers, and disc filters. These devices help eliminate foreign particles, enabling the achievement of food safety goals while reducing maintenance costs and downtime. By protecting essential equipment such as flow meters, heat exchangers, valves, cooling towers, spray nozzles, and pumps from damage caused by contaminants like nuts, bolts, and metal shavings, basket strainers emerge as a highly preferred choice for removing both metallic and non-metallic impurities up to specified particle sizes. These devices consist of closed vessels with wire mesh screens that trap solid debris from process fluids. Installing basket strainers in food industries is recognized as an effective practice for contaminant removal, product size regulation, and overall product quality improvement. The mesh is designed in various sizes and shapes and can be either woven or welded together.

1. Sanitary Basket Strainer

These closed vessels consist of wire mesh screens, which trap solid debris from process fluids. The installation of basket strainers in food industries is considered a best practice for eliminating contaminants, regulating product size, and improving product quality. The mesh is available in various sizes and configurations, either woven or welded.

These screens are tightly woven to provide effective straining material capable of filtering particles that are 100 microns or larger.

1. Types of Strainers

A. Strainers are categorized based on mesh size into three main filtering groups: 1. Coarse Strainers for large particles, 2. Medium Strainers for particles 75 microns, and 3. Fine Strainers for particles down to 5 microns. B. Based on the mode of operation: 1. Simplex Filter: Featuring a single chamber, these units remove particles and debris from the fluid flowing in the pipeline. They are not suitable for continuous processes as they require downtime for basket replacement or cleaning. Pressure comparison at inlet and outlet helps determine clogging.

2. Duplex Filter:

This design comprises two simplex filters connected by pipes and valves, allowing for operation in continuous modes. It features two independent basket strainer chambers sharing common inlet and outlet ports.

3. Self-Cleaning Basket Filters: Known as automatic self-cleaning strainers, these advanced models offer significant benefits: 1. Reduced downtime as baskets do not need to be removed for cleaning, resulting in lower maintenance costs. 2. Worry-free maintenance expenses.

Components

Basket strainers consist of various components discussed below: a. Industrial Basket Strainer Housing: The outer covering of the strainer, supporting the basket assembly. b. Filter Element: A cleanable screen integrated into the basket strainer to filter larger particles or dirt from the pipe system. Basket straining elements may be made of straight or staggered perforated plates. c. Handle: Designed for easy removal and installation of basket assembly. d. Internal Cylinder: Closes the inlet and outlet for replacing dirty elements by turning. e. Vent Valve: Used for pressure relief. f. Clogging Indicator: Signals when filter elements require replacement. g. Blow-Off Valve: Removes dirt particles to help clean strainer bodies. h. Inlet Port: The entry point for contaminated process fluid into the strainer element. i. Outlet Port: The exit point for clean fluid leaving the strainer element.

a. Material of Construction of Removable Basket Assembly: Strainers for beverages and food are typically manufactured from stainless steel mesh (304L/316L), though corrosion-resistant alloys can be used for processing highly corrosive fluids. b. Type of Process: Understanding whether the process operates in batch or continuous mode is vital for model selection. c. Nature of Fluid: Knowledge of whether the fluid is liquid, gaseous, abrasive, or corrosive is crucial. d. Process Parameters: Ensure system parameters such as working pressure, temperature, and flow rate match the strainer's specifications when purchasing an industrial basket strainer. e. Easy to Clean: Low surface roughness makes basket strainers easy to clean, essential for maintaining product safety, as corrosion can lead to bacterial growth and health issues. f. Flow Rate: Knowing the process flow rate is critical to selecting an appropriate basket filter model. g. Mesh Size: Indicates particle retention capability of the cleanable screen. h. Fabrication: Manufacturers of industrial welded simplex basket strainers use bolts or welding to connect components, with fully welded strainers being superior due to zero leakage and better cleanability. i. Installation Location: At standard engineering practices, strainers are used in pipelines to protect downstream mechanical equipment such as condensers, heat exchangers, pumps, compressors, meters, spray nozzles, turbines, and steam traps from sediment, rust, pipe scale, or other debris.

What are the Typical Applications of Basket Strainers in Industries?

Basket strainers play a crucial role in various applications.

To ensure your system runs smoothly and efficiently, a duplex basket strainer is essential.

Some of the main industries include:

1. Food Processing

Plants producing juice around the world must deliver top-quality products.

These facilities opt for the most suitable strainers.

The effectiveness of the strainer is determined by mesh size, which dictates filtration standards.

Food production applications utilize multiple strainers.

The flow first bypasses the wide mesh before proceeding to the finer one.

This process ensures maximum performance of the finer mesh, as clogging is a significant concern.

Serial operation of strainers leads to a pure end product—the ultimate goal of manufacturers.

The final straining must result in a high-quality, refined product.

2. Power Generation

This industry demands efficient filtration mechanisms for clean water filtration.

Downstream processes are vigorous, necessitating the protection of used equipment.

Process strainers and industrial basket strainers play a crucial role in safeguarding this equipment.

3. Pharmaceuticals

FDA regulations require that only pure medicines be produced.

Many factors come into play, particularly regarding the method of administration.

All injectables must remain free of particulate matter.

Experts recommend removing such matter, as it can cause clot formation and distress in patients.

The right strainers effectively eliminate particulate matter.

In other medical applications, appropriate strainers mitigate reliance on jugs.

The right strainers provide pure liquids for patient use.

4. Military Field

Navy vessels are significant customers of basket strainers.

Efficiency and smooth operation are key, and these strainers facilitate this objective.

Filtration is crucial for cooling engine oil.

It also plays an integral role in cooling weapon systems.

5. Irrigation

Large farms utilize industrial strainers for effective irrigation across plants.

Incoming water is drawn strongly from debris, sand, and rocks.

This helps protect sensitive pump components from damage.

Notably, large farms efficiently draw water from various catchment basins and onsite ponds.

These farms require significant water volumes to meet irrigation demands.

7. Automotive Fluid Production

Cars and trucks need a diverse range of fluids for optimal function.

All these fluids must be free of contaminants, as impurities can damage sensitive components.

Properly functioning strainers ensure efficient elimination of contaminants.

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