Sized on Souders-Brown, not pipe diameter
Vessel diameter is derived from gas density at actual conditions, which is what prevents re-entrainment at the top of the element.
SEPRA Series
Filter separators, coalescers and dry gas filters removing liquid aerosols to 0.1 ppmw and solids to 0.3 µm from natural gas, hydrogen and process gas.
- Residual aerosol carryover
- 0.1 ppmw
- Solids removal
- Absolute rated 0.3 µm to 25 µm
- Standard configurations
- 5
- Industries served
- 6
Overview
Aerosol separation where a droplet costs a compressor.
Liquid aerosol in a gas stream is invisible on any gauge and catastrophic in the wrong place. Sub-micron droplets pass straight through a knock-out drum, arrive at a compressor or a turbine, and remove blade material in hours.
SEPRA coalescers work in two stages. The filter medium captures and merges sub-micron droplets into large ones — this is coalescence, and it is the only mechanism that touches aerosols below 3 µm. Gravity and a vane pack then handle the enlarged droplets, which are now easy to separate.
Sizing is governed by the Souders-Brown velocity, not by pipe size. Getting this wrong is the single most common cause of coalescer re-entrainment — a filter that appears clean, at full differential pressure, and passes liquid downstream regardless. We size on gas density at actual operating conditions, every time.
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Specifications
Technical envelope
- Aerosol removal
- 99.98% of 0.3 µm droplets; ≤ 0.1 ppmw carryover
- Solids removal
- Absolute rated 0.3 µm to 25 µm
- Design pressure
- Vacuum to 250 bar g
- Design temperature
- −60 °C to +250 °C
- Gas flow
- Up to 120,000 m³/h per vessel
- Standards
- ISO 12500-1/2/3, ISO 8573-1 for compressed air quality
- Materials
- CS A516-70, SS 316L, Duplex 2205, Inconel 625 cladding
- Certification
- ASME U-stamp, PED, NACE MR0175 for sour service
Configurations
SEPRA-C
Vertical gas coalescer with two-stage element and liquid sump.
SEPRA-FS
Horizontal filter separator combining cyclone inlet, filter tubes and vane pack.
SEPRA-D
Dry gas particulate filter for solids-only duty with no liquid load.
SEPRA-H2
Hydrogen service configuration with embrittlement-resistant metallurgy and helium leak testing.
SEPRA-CA
Compressed air line filters, ISO 8573-1 Class 1 with oil-vapour carbon stage.
Advantages
What this platform does that a catalogue item does not.
Two-stage separation as one vessel
Coalescing media merges sub-micron aerosols; the vane pack removes the enlarged droplets — both inside a single code-stamped envelope.
Sour service as standard practice
NACE MR0175 compliant metallurgy, hardness-controlled welds and PWHT where the H₂S partial pressure calls for it.
Hydrogen-ready metallurgy
The SEPRA-H2 configuration uses embrittlement-resistant alloys and helium leak testing to 1×10⁻⁹ mbar·L/s.
Applications
Where it is installed
- Compressor suction protection on gas gathering and transmission
- Gas turbine fuel-gas conditioning to GE and Siemens specification
- Amine and glycol carryover removal in sweetening and dehydration
- Instrument and plant air to ISO 8573-1 Class 1
- Electrolyser hydrogen drying and purification loops
- Fuel-cell feed-gas polishing
Industries
Sectors this platform serves
Technical drawings
Issued with every order
Vessel general arrangement
Nozzle orientation, sump volume and level-instrument positions.
Element and vane pack detail
Coalescing media stack and vane spacing.
Sizing calculation sheet
Souders-Brown derivation at design and turndown cases.
Skid P&ID
Level control, dump valve and differential pressure instrumentation.
FAQs
Questions engineers ask about gas filters & coalescers
A separator uses gravity, momentum or centrifugal force and is effective down to roughly 10 µm. A coalescer merges sub-micron droplets into larger ones before separating them, which is the only way to reach 0.1 µm aerosol removal.
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Frequently specified alongside
Next step
Specify the gas filters & coalescers for your duty.
Send flow, contaminant, rating, chemistry and available pressure. We return a configuration with the sizing basis attached.
Or call +91 79 4890 2200 · sales@worldasatech.com