Industrial filtration knowledge base
Practical guidance for process engineers, maintenance teams, environmental specialists and procurement: from input data and technology selection to troubleshooting, service and specification writing.
Guides
Pick a guide by equipment, contaminant, media, grade or industry: each one carries a selection table and a checklist.
3DCyclone, baghouse, cartridge collector, scrubber or ESP — a selection table by dust, temperature and duty.
Open →Baghouse or cartridge collector
3DCompact fine-dust duty versus high loading, temperature and severe operation — how to compare the two technologies.
Open →Filter bag mediaA filter bag media selection matrix by temperature, gas chemistry, moisture, abrasion and specialist finishes.
Open →Air filter classes
3DWhy legacy grades cannot be mechanically converted to new ones and what a test report must show.
Open →Cartridge shape and media
3DCylinder, cone and oval designs; cellulose, spunbond, nanofibre, PTFE and antistatic media — the air cartridge type table.
Open →Natural gas filtration stagesStages for particles, condensate and oil aerosols upstream of pressure reduction stations, burners, compressors and turbines.
Open →Gas turbine intake air
3DStatic and pulse-jet systems, V-cell, coalescing and hydrophobic elements for dust, salt and fog.
Open →Choosing a filter pressChamber, membrane, automatic or tower — selecting the press type by slurry, cycle, cake moisture and discharge.
Open →Filter press clothsPP, PET, PA and weave type: selecting filter press cloth by chemistry, abrasion, particle size, permeability, cake release and washing.
Open →CEMS/AQMS architecture
3DFrom probe to emissions report: sampling, line, conditioning, analysers, DAHS, calibration, quality assurance and archive.
Open →Water treatment checklistWater treatment and online monitoring checklist: analysis, water balance, mechanical, membrane and chemical stages, monitoring points and service.
Open →TroubleshootingSymptom → cause → check → action: a matrix for high ΔP, dust leakage, short life, wet cake and unstable measurements.
Open →Panel, pocket, V-bank or HEPA
3DSelecting a ventilation filter for AHUs and clean areas: grade cascade, dust holding, dimensions, airflow and allowable ΔP.
Open →Compressor filtration chain
3DFrom intake to point of use: air, oil, separator, dryer, coalescer and ISO 8573-1 purity classes.
Open →Pleated bag or cartridge
3DWhy a high-temperature pleated bag is not a standard cartridge and what to check before retrofitting a baghouse.
Open →Cartridge temperature limit
3DWhy the standard cartridge maximum is 135 °C: media, adhesive, end caps, cage and gasket are rated as one assembly; the PET samples state 120 °C continuous.
Open →Standards and calculators
An overview of the Oʻz MSt 194/195:2024 standards and engineering calculators for a preliminary estimate.
3DAmbient air and emission monitoring in Uzbekistan: requirements of the new national standards for AQMS and CEMS.
Open →CalculatorsFour working tools for preliminary estimates: baghouse filtration area, cartridge quantity, CEMS threshold screening and reverse-osmosis balance.
Open →From the problem to a sound specification
Reliable selection begins with verified process data and equal supply boundaries for every quotation, not with a model number.
- 01Define the duty
Normal, minimum, maximum and upset duty, operating hours and seasonality.
- 02Characterise the contamination
Composition, loading, particle size, stickiness, abrasion, moisture and explosion risk.
- 03Set the target
Outlet concentration or grade, service life, allowable ΔP, cake moisture and equipment availability.
- 04Verify integration
Footprint, foundations, utilities, instrumentation, interfaces, hazardous area, maintenance and dismantling.
- 05Compare like for like
Scope, performance guarantees, consumables, installation, commissioning, training and lifecycle cost.
18 terms used in specifications
| Term | Definition |
|---|---|
| ΔP | Pressure difference between inlet and outlet; a filter loading indicator. |
| A/C ratio | Gas flow divided by cloth area, commonly m/min. |
| Nm³/h | Flow referenced to stated normal conditions. |
| Dust loading | Dust mass per gas volume, commonly g/m³, with size distribution. |
| Dew point | Temperature at which condensation starts; below it blinding and corrosion may occur. |
| Pulse-jet cleaning | Element regeneration by a short pulse of compressed air. |
| ePTFE membrane | Expanded PTFE; a fine membrane for surface filtration. |
| ISO ePM1 | ISO 16890 efficiency group referenced to the PM1 fraction. |
| MPPS size | Particle size at which a HEPA filter shows its minimum efficiency. |
| Coalescence | Combining fine droplets into larger drops for separation and drainage. |
| Cake | Solids layer formed on the cloth during filtration. |
| Filtrate | Liquid that has passed through the filter press cloth. |
| Membrane squeeze | Additional cake compression by a membrane after chamber filling. |
| CEMS | Continuous emissions monitoring system for a stationary source. |
| AQMS | Ambient air quality monitoring system. |
| DAHS system | Acquisition, validation, storage and reporting of analyser data. |
| Ex / ATEX rating | Hazardous-area equipment requirements; applicability is confirmed by the project. |
| Lifecycle cost | Purchase, energy, utilities, consumables, downtime, service and disposal. |
Frequently asked engineering questions
What data is needed for preliminary selection?
At minimum: flow, temperature, pressure, contaminant composition and loading, target result, duty, allowable ΔP and a photo or drawing of the installation point.
How does a cartridge collector differ from a baghouse?
Cartridges are compact and suit dry fine dust. Baghouses are often better for high loading, hot gas and severe continuous duty.
How should G4, F7, F9 and ISO ePM1 be compared?
Identify the standard first. G/F are legacy EN 779 grades; ISO ePM belongs to ISO 16890. There is no exact universal conversion: compare test reports at equal airflow and ΔP.
Which filter is needed upstream of a gas burner?
A 10–50 μm cartridge is common, but the burner or valve manufacturer and the project set the requirement. Verify DN, PN, flow, ΔP, temperature, drainage and contamination.
When does a gas turbine need pulse-jet filtration?
For high dust, storms and cleaning without shutdown. Consider climate, particle distribution, humidity, compressed air, efficiency and allowable inlet ΔP.
How can incorrect filter media be recognised?
Signs include rapid ageing, shrinkage, hydrolysis, burns, blinding, high residual ΔP, poor cake release or unstable emissions. Analyse the element and the duty history.
How is filter press cloth selected?
By pH, temperature, solvent, abrasion, particle size, filtrate clarity, cake release and cleaning method. Test several cloths for a new slurry.
What is included in CEMS/AQMS service?
Probe and line, consumables, flow and leak checks, zero/span, calibration, DAHS and communications, backup, service record and recommendations. Scope follows the quality method.
Why are there no fixed prices?
Price depends on capacity, materials, pressure, controls, installation and logistics. Compare quotations only after equal supply boundaries are defined.
Can you match an OEM reference?
Yes — once dimensions, seal, media, grade or rating, flow and conditions are confirmed. A code alone, without checking the parameters, can lead to a wrong selection.
Can I start with an online calculation?
Yes. Calculators provide an initial estimate but do not replace design calculations, safety review or manufacturer data.
Do you work outside Uzbekistan?
Yes, across Central Asia and the CIS. Logistics, certification, installation and service are defined for each country and site.
Which files should be attached to an enquiry?
The specification, datasheet, OEM reference, drawing, nameplate and mounting photos, process analysis, duty map and recent ΔP, emissions or filtrate data.
Can an existing system be upgraded?
Yes — after auditing the housing, fan or pump, hydraulics, controls, site and actual duty. Media, compartments, pulse system, instrumentation, washing or membrane plates can be replaced.
What is the maximum temperature of an air cartridge?
This site limits a complete standard cartridge assembly to 135 °C maximum. Many supplied PET samples state 120 °C continuous. The final value is always confirmed by the complete-assembly datasheet.
Which elements belong in screw compressor maintenance?
Normally the intake air filter, oil filter and air-oil separator, subject to model and interval. Downstream coalescing filters, the dryer and automatic drains are checked separately.
Why is a pleated bag treated separately?
It fits a baghouse tube sheet and follows different geometry and cleaning checks. Its high-temperature media ratings cannot be automatically applied to a standard cartridge.
Send process data and receive a solution map
We review the specification, identify missing measurements and propose a process arrangement and supply scope.