How To Size And Select Strainer Mesh

Definition and Principle of Mesh Number

Mesh number counts the openings in a 1-inch by 1-inch (25.4mm x 25.4mm) screen area. For example, a 100 mesh has 100 holes per inch in both directions. A higher mesh number means smaller holes and finer filtration. A lower number means bigger holes and coarser filtration. This idea is key for picking strainer mesh for valve filters or industrial systems.

Micron Size and Mesh Size

Micron and mesh size describe the holes in a strainer that catch debris. A micron is a tiny unit, one-millionth of a meter. It measures very small particles. Mesh size shows how many holes fit in one inch. For example, a 60 mesh equals about 250 microns. It filters particles 250 microns or bigger.

Conversion Between Mesh Number and Hole Size

A simple formula links mesh number and hole size: Mesh number × Aperture (microns) ≈ 15000. So, a 400-mesh screen has about 38-micron openings. Charts also help. A 10-mesh screen is around 2000 microns. A 400-mesh screen is near 37 microns.

Impact of Mesh Number on Filtration Effectiveness

Mesh number affects filtration a lot. Low numbers, like 20 mesh, catch big bits like sand or rust. They’re great for early filtration steps. High numbers, above 200, catch tiny particles. These suit ultrapure water systems or delicate tools. But finer meshes have smaller holes. They can clog fast and cause higher pressure drops.

Applications of Valves with Different Mesh Numbers

Different valve jobs need different strainer mesh sizes:

· 10 to 30 mesh: Used in main pipelines or air cylinder outlets to catch pipe rust debris.

· 40 to 60 mesh: Good for lubrication or compressed air systems to filter medium-sized bits.

· Around 100 mesh: Common in steam systems to shield steam traps from small debris.

· 100 to over 200 mesh: Best for precise equipment like flow meters or spray nozzles needing micro-particle protection.

Strainer and Filter Types

Y strainers work for inline systems with horizontal flow. Their angled design traps debris while keeping flow smooth. Suction strainers fit vertical setups, pulling media from tanks or reservoirs. Pneumatic filters clean compressed air systems by removing oil and moisture.

Basket strainers have larger filtering areas than Y strainers. They suit high-flow jobs needing fine filtration. Choosing the right type ensures strong protection and low maintenance.

Improperly Sized Strainers and Filters

Picking the wrong strainer mesh causes problems:

· Undersized filters: These lead to big pressure drops. They clog fast and need frequent cleaning.

· Oversized filters: These let unwanted bits pass. This can harm equipment downstream.
Correct sizing boosts performance. It also cuts maintenance costs and extends equipment life.

Step-by-Step Guide to Selecting Mesh Size

Step 1: Identify Primary Contaminants

Check the media—liquid or gas. List possible contaminants like sand, silt, or pollen.

Step 2: Determine Corresponding Mesh Sizes

Use a micron-to-mesh chart to match contaminant sizes with meshes. For example, beach sand (~700 microns) fits ~28 mesh.

Step 3: Select Appropriate Filter Mesh Size

Pick a mesh that catches the smallest critical particle. Balance flow rate and pressure drop. Check material compatibility with chemicals and temperature.

Step 4: Test and Validate

Install the chosen filter or strainer. Watch metrics like pressure drop or clogging frequency. Adjust if needed based on real results.

How to Select the Mesh Number

Start by knowing what’s being protected—pumps (20–40 mesh), valves (40–60), or precision tools (100+). Then, consider fluid thickness. Thick fluids like heavy oils may need coarser meshes to avoid clogging. Finally, balance pressure drop with filtration precision.

Relationship Between Mesh Number and Filter Type

Y-strainers often use 20 to 100 mesh based on needs. For finer filtration, basket strainers are better. They have larger surface areas. So, filter type and mesh number go hand in hand.

FAQs

What is a filter?

A filter removes impurities from fluids. It lets fluid pass but catches particles. Filters keep systems clean in industries like HVAC, engines, or water treatment.

How do I size a filter?

Look at flow rate, pressure drop, and particle retention. Use these with media analysis to pick an effective filter without hurting system efficiency.

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