Sintered Mesh Filter Pressure Drop Calculator

Estimate clean sintered wire mesh media pressure drop from measured permeability, or scale a reference measurement for the same filter element in the linear Darcy flow range.

For steady, single-phase Newtonian liquids in a confirmed Darcy flow range. Gas, slurry, fouled media and significant inertial resistance require other models or test data. This tool does not establish allowable differential pressure or a replacement threshold.

Enter your operating data

Calculation method Target actual liquid flow, Q

Target dynamic viscosity, μ

Active media area, A

Media thickness, L

Measured through-thickness permeability, k

Use permeability for the complete clean laminate in the flow direction. Use active gross media area, excluding sealed or blocked zones; do not multiply it by open-area percentage. The planar formula applies to flat media or a justified thin-wall approximation, not a thick cylindrical wall.

I have verified the liquid properties, clean-media condition and Darcy flow range for both the entered data and the target operating point.

Estimated pressure drop

Enter your data, confirm the calculation conditions, then calculate.

Formula and units

Measured permeability: ΔP = μLQ / (kA). Superficial velocity v = Q/A.

Reference measurement: ΔP = ΔP₀ × (μ/μ₀) × (Q/Q₀).

SI calculation units: Q in m³/s, μ in Pa·s, L in m, A in m², k in m² and ΔP in Pa. 1 bar = 100,000 Pa; 1 mPa·s = 1 cP. Use viscosity at the operating temperature. If only kinematic viscosity ν is known, calculate dynamic viscosity from μ = ρν using consistent SI units.

How to use the result

The permeability method estimates media resistance only. Element support, internal bore, connections, housing and piping may add losses. The reference method retains the measurement boundary of the entered test; use an element-only measurement or independently verified viscous boundary.

For multiple identical parallel elements, total active area may be used only when flow is distributed evenly and each element has the same media properties. A micron rating does not uniquely determine permeability. Verify the estimate against a clean flow–pressure-drop curve and the permitted differential pressure for the actual assembly and flow direction.

Frequently asked questions

Can I calculate pressure drop from micron rating alone?

No. Mesh weave, layer construction, compaction and flow direction affect permeability. Obtain measured permeability or a suitable clean-element test point.

Does this calculate total filter housing pressure drop?

The permeability method calculates media pressure drop. It excludes housing, support and connection losses. Reference scaling is valid only for the same boundary with confirmed linear viscous losses.

Can I use it for gas or a clogged filter?

No. Gas compressibility, inertial flow, solids loading and non-Newtonian behavior need an appropriate model or measured curves.

Is this the maximum pressure the filter can withstand?

No. Operating line pressure and allowable element differential pressure are different specifications. Use the approved assembly rating and project-specific cleaning or replacement criteria.

Related tools and products

Filter area & face velocity calculator · General flow & pressure drop calculator · Pressure unit converter · Sintered mesh filter elements

Technical references

ISO 4022:2018 — fluid permeability of permeable sintered metal materials describes permeability testing, including viscous and inertial coefficients. Darcy’s law equation formulation defines permeability, viscosity and superficial velocity. This calculator is a preliminary Darcy estimate, not an ISO test or certification.

For a project review, provide fluid and temperature, actual flow range, filtration requirement, element dimensions, clean pressure-drop data and allowable differential pressure. Discuss your filtration requirements.