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Gas Treatment


High Pressure Filters

350 bar Filters

GH series Parker Zander high-pressure fi lters are designed to be ideal for high-pressure areas of up to 350 bar. Innovative construction features of the filter housing provide a reliable assemblence, as well as simple and safe handling for replacing the filter element. One essential construction feature is the double o-ring sealing which protects the housing thread against pollution and humidity and therefore prevents the thread from corrosion. Additionally the second o-ring prevents the fi lter housing parts from overwinding. By fasten the fi lter element via it΄s base thread screwed on the tie-rod, which provides the greatest operating safety, even under the pressure pulsations in intermittent operation that are common for high-pressure applications. Highly-effective pleated media in four different grades provide an element surface that is four times the size, compared to the conventional
wrapped design. The result is a reduced flow speed and efficient separation simultaneously with low pressure drop, thus providing cost reduction during operation with reliable separation performance.

50 bar Filters

The removal of impurities within a compressed air system is vitally important in order to prevent contamination of downstream processes equipment and products. Parker domnick hunter OIL-X IP50 ADVANTAGE intermediate pressure filters combine the new energy efficient OIL-Xplus filter elements with specially designed housings to provide high efficiency filtration for applications up to 50 barg (725 psig). Available in various filtration grades and connection sizes, they provide a level of protection tailored to your application.



Before Biogas can be used for the production of electricity and heat in a “Combined Heat & Power Unit (CHP)” biogas treatment must take place.

Application – Digester Gas

The Problem

Once the waste material has been placed in the digester, mixed, and converted to gas, the resultant gas will contain impurities generated by and left over from the actual digestion process. These impurities include water, condensed gas liquids, hydrocarbons, and acid gas which must be removed prior to transport, for usage or simply for storage.

Unfiltered gas leads to:

  • Engine damage

  • Fouling in gas scrubbers, valves and other instrumentation equipment

The Solution

The gas coming off the digester should be treated prior to entering a gas receiver to eliminate contaminants generated by digestion. Gas leaving the digester should be treated to remove any particles and moisture carried over from the process. A coalescing filter or separator is recommended prior to the gas-engine. Additionally adsorption dryers may be required for special applications where the gas is to be injected into the national or
local network.

Application – Landfill Gas

The Problem

Landfills are naturally dirty and retain particulate and moisture. Temperature changes increase the amount of condensate at both the heat exchanger outlet and gas collection point.

Inadequate filtration of the gas produced will lead to:

  • System compressor damage

  • Heat exchanger fouling

  • Unpleasant odours

  • Safety hazards and other problems at energy usage sites

The Solution

Treatment of collected landfill gas entering into the compressor will eliminate particles, moisture and aerosols, such as aromatic compounds and halogenated hydrocarbons that could otherwise damage downstream equipment. A coaleser should be placed downstream of the heat exchanger to collect any compressor lube oil and condensed liquids.

Range of biogas treatment supplied by Parker Hiross Zander

  • Filters

  • Cooling and chilling packages

  • Condensate drains

  • Gas drying and dehydration packages, utilising TSA and PSA technology

  • Removal systems for siloxanes, H2S, NH3, HHC from biogas/ landfillgas

  • Fuel, associated gas and natural gas purification systems

  • High Pressure compressed gas filters

  • Instrument air packages


CO2 quality incident protection

The quality of Carbon Dioxide used in the beverage industry is strictly controlled by both the beverage companies and gas supply companies. CO2 is a by-product of various processes and is generally of poor quality when un-treated. Therefore, a number of purification steps and quality checks are employed on these supplies. The PCO2 is a static adsorption system for use with beverage grade CO2 , it is designed to act as a “Quality Incident Protection Device” . It’s purpose is to ensure that beverage quality is not adversely effected by potential trace impurities that could be present in the gas feed stock. Traditionally on-site CO2 gas phase polishing has been carried out by carbon adsorption towers. These towers, whilst effective at reducing the levels of general hydrocarbons they do not offer protection against other potential contaminants or impurities, such as sulphur compounds. It is well known within the beverage industry that incidents have and do occur where the CO2 quality has had an impact upon the final beverage.


Commercial CO2 is produced from a wide variety of sources:

  • Impurities may remain in the CO2 due to

    • Residual traces carried over from the feedstock.

    • An inefficient or poorly maintained gas treatment system.

  • Contaminants may be introduced via the storage and distribution of the liquid CO2

    • E.g. from tankers, hoses, holding tanks, cylinders etc.

Potential Impurity Sources

Potential ContaminantCombustionWells / GeothermalFermentationHydrogen / Ammonia ProductionCoal GasificationEthylene Oxide Production



Carbon Monoxide

Carbonyl Sulphide

Cyclic Aliphatic Hydrocarbons

Dimethyl Sulphide


Ethyl Benzene

Hydrogen Sulphide



Nitrogen Oxides

Sulphur Dioxide


Volatile Hydrocarbons


PCO2 Carbon Dioxide Quality Incident Protection Systems from Parker domnick hunter offer a comprehensive solution to preserve and guarantee the quality of gaseous carbon dioxide used in sparkling beverage bottling.


Using multi-layer adsorbant technology, the PCO2 range includes Maxi PCO2 and Mplus PCO2 for plant scale protection.

Operating as a Quality Incident Protection removing a wide range of potential carbon dioxide impurities, the system guarantees the gas quality so it remains within industry and company guidelines, preventing detrimental consequences to the finished end beverage, producers reputation and their bottom-line.


  • Comprehensive six stage technology

  • Simple installation

  • Compact design

  • Low maintenance

  • Low pressure drop

  • Meets ISO9001:2000 standards

  • Materials of construction independent verifications to comply with FDA Code of Federal Regulations title 21 CFR


  • Carbon dioxide quality guaranteed. Effective in removing a combination of potential impurities and contaminants

  • Protection against impurities known to create beverage flavor defects. Helps avoid product spoilage and protects bottlers reputation

  • Ensures carbon dioxide meets industry and company specifications and guidelines. Cleans ‘out of specification’ gas back within beverage quality guidelines

  • International sales and service support. Over 20 years experience. Pure care preventative maintenance option available
















0.01 micron particle filtration Removal of non-volatile organic residue (NVOR) and other contaminants down to 0.01 ppm


* Supplied with every system
** Optional – Sterilizing Grade: consult Parker for operational use


Gas Dryers

Parker Zander adsorption technology dryers for dehumidification of a wide range of industrial and natural gases.

Single adsorption bed or twin tower regenerative PSA, for effective moisture removal from natural gases (landfill gas, CNG, methane, biogas-biomethane, propane, etc) or industrial gases as hydrogen, nitrogen, argon, oxygen, carbon dioxide, ammonia, etc.

Wide range flow capacity up to 18000 m3/h

Operating pressure up to 350 bar

Operating media temperature up to 120oC

Housing selection material to suit specific gas compatibility

Optionally available as ATEX version

Common Questions-Information

What are the main sources of contamination in a compressed air system?

  • The atmospheric air
    Air compressors draw in vast volumes of air from the surrounding atmosphere which contain large concentrations of airborne contaminants.

  • The type and operation of the air compressor
    The air compressor can also add contamination from wear particles to coolants and degraded lubricants.

  • Air receivers and piping system
    The air receiver and system piping stores and distributes the compressed air but will also retain the large amounts of contamination drawn into the system. Additionally they cool the moist compressed air to cause condensation on a large scale. This will promote corrosion, poor performance and potentially the buildup of sources of microorganisms.

Which are the main types of contamination in a compressed air system?


  • Particulate
    Particulate contamination in a compressed air system is a combination of atmospheric dirt, microorganisms, rust and pipe scale. Atmospheric dirt and microorganisms exist in the large volumes of compressed air drawn in and rust and pipe scale occur due to corrosion of the compressed air system.
    The dirt and rust can cause blockage or damage to the production equipment and of course if a few microorganisms were to enter a clean sterile environment enormous damage could be caused.

  • Water
    In a compressed air system water exists as water vapor, condensed liquid water and water aerosols. Of the main contaminants found in a compressed air system water is either directly or indirectly responsible for the majority of problems experienced by the compressed air user.
    The water vapor enters the system through the compressor intake. The compression procedure causes the condensation of a large amount of the water vapour which has to be removed. Even after that removal there might be occasions where further local cooling of the compressed will have as result more water vapour to be condensed.
    Water in any form must be removed to enable the system to function correctly and perform efficiently.

  • Oil
    Oil is introduced into the compressed air system either through the compressor intake as a vapour or by the compressor as a liquid or as an aerosol (fine mist). The atmospheric air contains oil in the form of unburned hydrocarbons and its concentration can vary betwwen 0,05 and 0,5mg per cubic meter. On the other hand a typical concentration of 2 – 5mg per cubic meter enters the system from the oil used as lubricant from the compressor itself.
    The main problems with oil in the compressed air system are due to the oil mixing with water already present. At this point the oil has lost its lubricating properties often becoming very acidic, which causes severe corrosion problems.

How can I specify the quality of compressed air?
There are three standards currently in use which directly relate to compressed air quality (purity) and testing but the most commonly used standard is the ISO 8573 series and in particular the ISO 8573-1. According this part the compressed air quality is defined by three figures, e.g. 1.1.1. known as classes of compressed air.
The first number identifies the particulate content of the compressed air
The second number identifies the liquid water or vapor water content of the compressed air.
The third number identifies the total oil content of the compressed air.
According to ISO 8573-1 a class 1.1.1 compressed air represents the highest quality of compressed air with specific limits of contamination.
Class 0 for each type of contaminant also exists and it allows the user and an equipment manufacturer or supplier to agree their own levels which typically should be more stringent than class 1.

How can I specify the equipment for compressed air treatment based on ISO 8573-1.
This information should be provided by the equipment manufacturer and it is his responsibility to prove that his equipment complies with the requirements of the ISO 8573-1.

The equipment provided by Parker domnick hunter for compressed air treatment is certified independently by Lloyds register to comply with the requirements of ISO 8573-1 and that the testing procedure is according to ISO 12500

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