The Principle And Application Of Stainless Steel Clamp-type Magnetic Filters

A sanitary filter with a vertical cylinder and a domed bottom captures ferrous particles through a magnetic core. Product flows down around the core, and the domed base sweeps clean during CIP. Remove the clamped lid to pull the core for wiping. This design suits dairy, beverage, and pharmaceutical lines.

Vertical Housing and Flow Path

The cylindrical shell stands upright on the line. Side ports direct flow around the magnetic core. The domed bottom collects settled particles without a low-velocity corner.

• Upright shell holds the magnetic core

• Side ports direct flow around the core

• Domed bottom collects settled particles

• Long contact path captures fine metal

A flat bottom would leave a corner where particles resist flushing. The domed base lets the flow sweep the base clean.

Magnetic Core and Capture Mechanism

The core uses magnetic rods or a central bar. Each rod pulls ferrous particles to its surface. The captured material stays on the rod until removal.

A sanitary strainer uses a mesh basket instead of a magnet. It traps larger particles by size. The magnetic core targets ferrous fines that pass the mesh.

Clamped Lid and Access

The lid clamps to the housing rim through a gasket joint. Removing the clamp lifts the lid and exposes the core. The core pulls out for wiping and inspection.

A tri clamp strainer body allows fast access without cutting pipe. The clamp joint separates the lid from the shell during cleaning.

Materials and Surface Finish

Wetted parts use SS304 or SS316L. SS316L resists acidic products and repeated SIP cycles. Internal surfaces reach Ra ≤ 0.8 μm. Electropolishing lowers roughness toward Ra ≤ 0.4 μm and reduces attachment sites for microbes.

A sanitary filter housing with a polished bore releases soil during cleaning. Smooth surfaces also let the core slide out without dragging residue.

Installation and Maintenance Steps

1. Confirm the clamp size matches the line ferrule.

2. Mount the housing so the domed bottom drains by gravity.

3. Check the lid gasket sits flat before clamping.

4. Pull the core at scheduled intervals and wipe it clean.

5. Inspect the gasket and bore at each service window.

A worn lid gasket leaks at the rim. Replace it when cuts, swelling, or hardening appear. Check the core rods for bent segments that reduce capture area.

Common Applications

Magnetic filters serve lines that must remove metal fines. The vertical housing fits skids with limited floor space.

• Dairy and beverage transfer lines

• Pharmaceutical ingredient dosing

• Food processing pump outlets

• CIP return circuit protection

• Cosmetic and personal care production

A sanitary filter with a magnetic core suits lines downstream of pumps and mixers. The core catches wear particles before they reach filling equipment.

Capture Capacity and Cleaning Frequency

Capture capacity depends on core surface area and particle load. A line with new pump seals sheds more ferrous material in the first weeks. Check the core more often during that period. Wipe the rods with a soft cloth and a food-grade cleaner. Record the weight of removed material if the line tracks wear rates. A rising catch rate points to pump or valve wear upstream.

Stainless Steel Clamped Magnetic Filter

Magnetic Filters are used for filtration of iron particles from products in liquid/slurry form. They are essentially used in chemical, food, pharma and oil industries. 

Different materials are used for permanent magnets. Commonly used magnets are made from AlNiCo, ceramics or rare earths. Taking into account the application parameters, magnets made of rare earths (neodymium magnets) offer the highest flux density and thus the greatest attraction for dirt particles. A disadvantage is that the material is very susceptible to corrosion and must therefore always be protected by a coating or stainless steel housing.