Filter Separator

Filter Separator

Filter Separator is used to remove liquid, small solids (created by the tubing and wing erosion) and other particles from the flow steam. Filter separators, like other gas-liquid separators, can be horizontal and vertical; the most common type is horizontal. If there is a large amount of water in coming gas, structure of filter separator is designed to have a “boot” in the bottom of the separator connected with two similar tubes parallel to each other. Retention period required between 3 and 5 minutes for hydrocarbon (oil)-water separation by settling. Sizing the dimension of the filter separator’s each section depends on the calculations and design of manufacturer or engineering company.

Filter separator consist of coalescing filters and mist extractor inside of its vessel, usually have quick opening closures for maintenance and replacement of the filters.

“Filter separators and coalescing filters are required, when droplet sizes below 3 microns”

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Typical Horizontal Filter Separator

Filter separators have a wide application in gas pipelines, as well as the gas processing plants, for example, acid removal units, when after passing filters separators catch the liquids and condensed hydrocarbons coming from the absorber. In gas processing, adequate inlet separator and filter separator are required to prevent foaming due to the chemical contamination. If absorber is downstream from amine unit, glycol unit, or compressor, a filter separator is required. Also, filter separator and coalescing filter used to prevent fine mists from entering the absorber.

Solid removal efficiency of the filter separator is 100% when size of solids is 3 microns & larger, and 99%, when size of solids are 0.5-3 microns, while liquid removal efficiency is 98% when size is 8 microns & larger.

Efficiency of filter separator depends on particle size, distribution of particles, and liquid loading.

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Typical Horizontal Filter Separator
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Typical Vertical Filter Separator

Typical Arrangements of Filter Elements

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Gas-liquid and Liquid-Liquid Coalescers

Coalescers are used for gas-liquid or liquid-liquid separation. Coalescers are designed by the composition and type of contaminants on the flow media.

Coalescing filters are also used to prevent fine mists from entering the absorber. Liquid-gas coalesces are also used for removal of fine aerosols in gas production, processing and transmission. Coalesce cartridges, made of pleated glass fiber media supported by metal core, which has higher efficiency then traditional separators with mesh pads and vane packs. The reason is higher efficiency is that cartridges contain a much finer pore structure and larger surface area. Coalescers remove 99.5% solids 0.4 micron and larger.

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Typical horizontal liquid phase coalescers

“Iron Sulfide from corrosion, can interfere with the liquid-liquid separation, thus the section of liquid collection acts as a holder for the liquids removed from the gas in the vessel upper sections”

Coalescing Filters, normally are vertical, used in natural gas pipelines to remove liquids from the flow streams, where very high gas-to-liquid ratios. Coalescing filters have only filter cartridges.

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Typical horizontal liquid phase coalescers
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Horizontal two-stage coalescing filters
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Typical vertical liquid-liquid coalesce
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Horizontal coalescer with prefiltering vessel
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Typical Cartridge Filter

Technical Parameters

Design pressure Vessel size Gas Capacity MMSCFD
psi MPa inch x foot mm x mm 400
PSIG
600
PSIG
800
PSIG
1000
PSIG
1200
PSIG
1400
PSIG
1440 9.9 16 x 8.5 406 x 2591 19 23 26 29 32 34
1440 9.9 20 x 8.5 508 x 2591 23 28 32 35 38 41
1440 9.9 20 x 10 508 x 3048 23 28 32 35 38 41
1440 9.9 24 x 12.5 610 x 3810 45 56 64 74 77 83
1440 9.9 30 x 12.5 762 x 3810 80 98 112 125 136 145
1440 9.9 36 x 12.5 914 x 3810 111 135 155 173 188 201
    Features
  • Skid-mounted
  • Flanges
  • API 14C rated (for offshore)
  • Quick Opening Closure
  • Manway
  • Valve bypass
  • Customized capacity ratings
  • Sour service
  • Controllers and indicators
  • Flow control equipment
  • Durable internals
  • High-efficient filter elements
  • 3-layer coating
  • Insulation
  • Fireproofing
  • Electrical and signals lines
  • Liquid boot
    Benefits
  • Efficient liquid removal
  • Efficient solids removal
  • Safe operation
  • Fast filter replacement
  • Easy maintenance
  • Remote and local control
  • Corrosion resistance
  • Outdoor installation
  • Adequate piping arrangement
  • Spare filter elements and parts
  • Space-saving
  • Onshore and offshore application
    Code & Standards
  • ASME Sec VIII, U or U2
  • NACE MR0175
  • API 14C
  • ASME B16.5 and ASME B16.47
  • EN 10204 type 3.1
    Testing & Inspection
  • Non-Destructive Examination (NDE)
  • Radiography (RT)
  • Ultrasonic
  • Magnetic Particle
  • Dye Penetrant
  • Function Test (for Closures)
  • RMI Test
  • Impact Test
  • RWHT
  • Special Heat Treatment
  • Material Certification
  • Hydrostatic Test
  • Coating test & inspection
    Application
  • Gas pipelines
  • Gas field treatments
  • Metering & regulating stations
  • Petrochemical plants
  • Gas processing plants
  • Chemical processing plants
    Working Media
  • Natural gas
  • Methyl Chloride
  • Methane
  • Hydrogen
  • Propane
  • Propylene
  • Helium
  • Halocarbons
  • Ethylene
  • Ethane
  • Carbon Monoxide
  • Carbon Dioxide
  • Ammonia
  • Biogas
  • Air
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