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GasFiltersTRANSCRIPT
Today’s Agenda• Gas Filtration / Separation Basics• Common Gas Filter Applications • Common Contaminants • Mist Eliminators• Scrubbers and Separators• Filter Elements• Dry Gas Filters• Filter Separators• Vertical Gas Coalescers• Horizontal Gas Coalescers• Questions and Comments
Definition of Filtration / Separation -• The act of removing and / or separating solid particles, impurities,
etc from a liquid or a gas by the use of filtration / separation mechanisms. The act of removing a contaminant from a product to either further purify the product or protect a piece of equipment from the contaminant
• Types of Filtration / Separation –solids from gas / liquids from gas / solids & liquids from
gas / solids from liquid / liquids from liquid
FILTRATION / SEPARATION BASICS
• Keys to Understanding Filtration / Separation –- Four types of contaminants exist
Solids, Liquids, Semi-Solids, Gas
– Four mechanisms are utilized to accomplish separation or filtration
Gravity, Mechanical, Coalescence, Chemical
– The separation method used in a filter or separator will incorporate one or more of these mechanisms to remove one or more of the contaminant types
FILTRATION / SEPARATION BASICS
Typical Gas Filter Applications:• Compressor Suction• Compressor Discharge• Compressor Interstage• Compressor Lube Oil• Fuel Gas• Seal Gas• Meter Stations• Pipeline Interconnects• Gas Storage• Glycol Dehydration
• >> Remove Bulk Free Liquids from Gas
• >> Method = Mist Eliminators
• Mist Eliminator Contaminant• Wiremesh HC liquids, Water
• Vane HC liquids, Water
• Cyclotube Lube oil, Glycol, Paraffin, Brine, Asphaltines
• Mini-Cyclones Dry solids in addition to free liquids
LIQUID / GAS SEPARATION
• Separator - is defined as single stage housing that utilizes a mist eliminator (vane, wire mesh or centrifugal) to remove entrained liquid mist from flowing gas. Impingement from the pipe exit (inlet nozzle) is directly on the mist eliminator. There is no calculation or consideration given to separation due to gravity before the inlet gas comes into contact with the mist eliminator.
• Scrubber - is defined as a two stage housing that utilizes a first stage area for bulk separation of liquids from the flowing gas and a second stage mist eliminator (vane, wire mesh or centrifugal) to remove entrained liquid mist from flowing gas. Impingement from the pipe exit (inlet nozzle) is below the mist eliminator. The mist eliminator sizing in a scrubber is secondary to the first stage. The first stage is governed by a Newton's Law calculation that determines the minimum diameter necessary for a droplet of a given size to "fall" due to gravity based on its density.
Gas Filtration ProductsUse a Scrubber when:>>There is a potential for slugs>>There is a continuous heavy liquid Load
Applications•Plant Entrance•Contact Tower Inlet & Overhead•Compression•Storage•Well Head
SCRUBBERS (SLUG CATCHER)
Slugs fall into lower sump
Inlet
PFDBS reduces turbulence inlower sump
Outlet
Gas and entrained liquids enter vane
Liquids drain via downcomer tolower sump
VANE SCRUBBER
98% of 8 micron and larger, liquidand entrained solids
CYCLOTUBE SCRUBBER
Inlet
Outlet
Slugs fall into lower sump
Entrained liquids removed by CT
Liquids collect in upper sump
PFDBS reduces turbulence inlower sump
Note: Two sets of controls required (two sumps)
Gas and entrained liquids enter CT
98% of 3 micron and larger, liquid and
entrained solids
Use a Separator when:>>Light mist or entrained liquid>>No Slugs present
Applications•Vent Gas•Compression•Meter & Regulation Stations
SEPARATORS
Outlet
Inlet
Entrained liquids removed by CT
Liquids collect in sump
CYCLOTUBE SEPARATOR
98% of 3 micron and larger, liquid andentrained solids
Outlet
VANE INLINE SEPARATOR
Inlet
Entrained liquids removed by Vane
Liquids collect in sump
Liquid fall from bottomof vane
98% of 8 micron and larger, liquid andentrained solids
PEACHPeco Engineered Applied Conical Helix
• Radial Flow• Axial Flow• Helical Flow
• Intelligent Filter• More Open Fiber
Matrix• Lower dP
Intelligent Flow Pattern
Yoke Style Yoke Style (Large)
Internal Door Style Blind Flange Style
VESSEL ENTRY CLOSURES
Screw Type
REMOVAL OF SOLIDS FROM GAS
• - Remove Solids and Semi-Solids from Gas• >>Method 1 = Depth Cartridge Filter• >>Method 2 = Pleated (Surface Barrier) Cartridge
• Depth Cartridge is Needed for Semi-Solids, Deformable, or Shear Sensitive Solids.
• Ex. - Iron sulfide, Asphaltines
• Pleated Cartridge is used for Rigid Solids (Most applications)• Ex. - Iron Oxide, Scale, Sand
Dry Gas Filtration
Gas Filtration Products
Applications:•Desiccant Removal•Fuel Gas•Meter Stations•Regulator Stations
99.98% of solidparticles 1 micron and larger
DRY GAS FILTER
FILTER ELEMENTPSFG-336PCHG-336
Horizontal
Vertical
FILTER SEPARATORS
Remove Solids and Liquids from Gas
• Technology developed in 1955 (PECOFacet)
• Removes both liquid and solids for the gas stream
• Can be designed to handle small liquid slugs
• The filter separator has two stages. The first stage utilizes risers and coalescing elements to remove bulk liquids and solids and to coalesceaerosol into larger droplets. The second stage uses a mist eliminator toremove the droplets that were coalesced in the first stage.
• Filter separators are designed to remove moderate liquid and solidsloads. They should not be used in services where large slugs of liquids or solids are expected.
Gas Filtration Products
Applications:•Compressor Suction•Storage Facilities•M&R Stations•Processing Plants
99.98% of liquid droplets and solidparticles 1 micron and larger
FILTER SEPARATOR
FILTER ELEMENTPCHG-324/336/372FG-324/336/372
Horizontal
Vertical
The Filter Separator Mechanism
Sump and downcomer sizing
Bulk liquids and solids impingeon risers and fall out
Entrained solids filtered whileentrained liquids are coalesce
by coalescing elements
Liquids collect in sump
Coalesced dropletsremoved by vane
Closure
Inlet
Bulk liquids and solids impingeon risers and fall out
Bulk liquids collectin upper sump
Coalesced dropletsremoved by vane
Outlet
Liquids removed byvane drain to lower sump
Entrained solids filtered whileentrained liquids are coalescedby coalescing elements
Closure
Vertical
Filter Separator
Filter Separator Technology still widely utilized
PEACH Element Technology - DOE
Z-Bar riser with threaded stud, flat washer / rubber washer / dimple washer / double nut
Efficiencies as good as 99.98% - 1 micron & larger solids and liquids
Not recommended for low surface tension liquids, fouling, sticky or critical service
• >>Remove Fine Aerosols and Solids from Gas• >>Gas Polishing
• Technology was introduced in 1983
• Only in Vertical configuration until 1999
• Achieves 99.98% removal effiicency of 0.3 micron on solids and 99.5% removal efficiency of liquids
• The reverse flow coalescing filter is designed for relatively clean services that require final polishing or services in which the contaminant is submicronic and present in small quantity. Unless special considerations are made it should not be used where there are moderate or high liquid or solid loads.
REVERSE FLOW COALESCING FILTERS
Gas Filtration Products
Applications:•Contact Tower Inlet•Contact Tower Overhead•Desiccant Bed Inlet•Fuel Gas•Compressor Discharge•Storage Wells
99.5% of liquid, 0.3 Micron and larger99.99% of solids, 0.3 Micron and larger
100% Turndown
VERTICAL GAS COALESCER
FILTER ELEMENTNGGC-336FF-336
The Coalescing Filter Mechanism
Outlet
Inlet
Gas forced to make 180degree turn before exiting
Bulk liquids and solids fall intobottom sump
PEFDB reduces turbulence in the sump
Liquids removed by elementscollect in upper sump
Gas Filtration Products
Inlet
Coalesced liquids and solids fall intobottom sump
Outlet
Entrained solids filtered whileentrained liquids are coalescedby coalescing element. Insideto outside flow.
Gas and entrained liquidsare enter directly into theCoalescing element
Note: Only one sump
ClosureGas is forced to makea 180 degree turn beforeexiting.
Single Element Design
Reverse Flow Coalescer Technology still widely utilized
Tripod riser with threaded rod / single nut
Not recommended for solids
Not recommended for liquids loading greater than fogs or aerosol mist
Excellent on low surface tension liquids and critical service
Not recommended for fouling or sticky service
Reverse Flow Coalescer
>>Remove Fine Aerosols and Solids from Gas>>Gas Polishing
• Technology introduced in 1999 (PECOFacet’s Gemini)
• Achieves 99.98% removal efficiency of 0.3 micron on solids and 99.5% removal efficiency of liquids
• 2 Stage Vessel
• 4 stages of coalescing
• First stage outside to inside flow
• Second stage inside to outside flow
• Combines the dirt and liquid handling characteristics of a Filter Separator with an overall Performance guaranteed to exceed that of a traditional reverse flow Coalescer
Horizontal Gas Coalescing Filter
Gas Filtration ProductsGemini Horizontal Coalescer
Applications:•Compressor Suction and Discharge•Low NOx Fuel Gas•M&R Stations•Glycol Tower Inlet•Glycol Tower Overhead
99.5% of liquid, 0.3 Micron and larger99.99% of solids, 0.3 Micron and larger100% Turndown
FILTER ELEMENTPGC-373/382/394
Peach Gemini PuraSep
2 Stage Liquid Sump
Outside to Inside flow
Inside to Outside flow
Support
LIB
Closure
Gas Filtration Products
• HIGH DIRT LOAD CAPACITY
•HIGH LIQUID LOAD PER ELEMENT (0.5 GPM PER ELEMENT)
•GREATER EFFICENCY OVER THE FILTER SEPARATOR
•100% TURNDOWN RATIO
•NO CONVENTIONAL 2ND STAGE INTERNALS
•MAINTENANCE FRIENDLY
•HORIZONTAL DESIGN, NO LADDERS OR PLATFORM
OFFERS REMOVAL EFFICIENCY OF A VERTICAL COALESCER WHILE HANDLING LIQUID AND SOLIDS CONTAIMINANTS OF A FILTER SEPARATOR
Horizontal Coalescer Advantages