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[ Automatic Valveless Gravity Filters (Siphon Filters) ]

Advantages

Automatic Valveless Gravity Filters are atmospheric sand filters, often employed as side stream filters in cooling towers circuits for their characteristics:

No rotating equipment, no PLC, no ON/OFF valves are associated to the system
The capacity to handle high flowrate of water
The simple and robust design
The little maintenance required

The siphon filter principle

The filter includes a filtration chamber, a backwash water hold-up reservoir overflowing to the treated water header and backwash siphon.

When the pressure drop through one filter reaches the break-through value the siphon is primed. Water contained in the internal reservoir backflows to the waste water channel, backwashing the filtering sand layer. Then the filter returns to normal service.

Unidro solutions

Unidro design include different options for each project optimization:

Multi-filter systems with distribution tower for flexible management of large flowrate with transportable size equipment
Double bed filters for minimum footprint
Site assembly of shop preformed sheets for filters larger than transportation limits
Concrete fabrication instead of steel shells for cost optimization
Multiple chamber combined filters for large capacity systems

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[ Process Filters ]

Unidro process filters cover a wide range of application for gas and hydrocarbon filters, including solid removal from gas and liquid, liquid/gas and liquid/liquid separation.

The process

Double step filter separators are designed to provide efficient liquid/solid removal from gas streams at high gas capacities
They may include vane separation section, demisters, coalescing stepas required by the design data and the required performances.
Filter separators are designed in either a horizontal or vertical configuration, single or double chamber.

Coalescing Filters

Coalescing is the separation of liquid aerosols and droplets from a gas.
The process can be implemented using specially designed coalescing cartridges or by coalescing plates packs, which allows droplets to run together and to form large drops which may be separated by gravity within the filter. Coalescing efficiency typically ranges from 98 to 99.9% of droplets with size down to 0.3 micron, depending on internals to be used in accordance with application and process requirements, Unidro can manufacture coalescers both in vertical and in horizontal configurations as well as single or double barrel.

Individual equipment or complete package

According to each project requirements, Unidro scope of supply may include individual equipment (filter vessel with internals) as well as complete skid packages (multiple filters with interconnecting piping, instruments fully assembled on skid and ready to be installed).

Produced water treatment

With experience in water treatment, a wide separation equipment portfolio and a specific know-how on wellhead processes Unidro is a highly qualified partner for PWT.

Water injection

In the “water flooding” or “water injection” process the water is injected into the oil producing rock displacing oil towards a second well where the oil is extracted.

Cartridge Filters

Unidro can provide a complete range of disposable and backwashable cartridge filters for the standard to the most critical applications in the oil and gas industry, both for water, HC and process streams.

Wellhead equipment

Unidro is able to provide a wide range of Crude Oil Treatment process solutions for the Offshore/Onshore Oil&Gas Industry.

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[ Atmospheric & Vacuum Degasifiers ]

Towers, ejectors, condensers and structural internal parts are designed and manufactured in house for our vacuum degasifiers to remove oxygen, h2s and other volatile from water streams.

Multiple applications

Our experience includes atmospheric and vacuum degasifiers for CO2 and Oxygen removal units for demineralisation unit, boiler feed water, process water, injection water, H2S removal units from process and waste water streams and Btex stripping.

Design and fabrication

Process and mechanical design of each piece of equipment is made by our engineers for each customer.
In case of vacuum degasifiers, Unidro know-how covers the design and fabrication of the complete vacuum package, including ejectors and condenser.
When special internals are required we may select them with our suppliers in order to assure the required performances to our clients.
According to each project requirements, Unidro scope of supply may include individual equipment (vessel with internals) as well as complete skid packages (single or multiple equipment with interconnecting piping, instruments pumps and vacuum systems fully assembled on skid and ready to be installed).

Applications

CO2 and oxygen removal for boiler feed water
Oxigen removal for well water injection
H2S removal for waste streams decontamination
BTEX stripping from produced water

Produced water treatment

With experience in water treatment, a wide separation equipment portfolio and a specific know-how on wellhead processes Unidro is a highly qualified partner for PWT.

Water injection

In the “water flooding” or “water injection” process the water is injected into the oil producing rock displacing oil towards a second well where the oil is extracted.

Cartridge Filters

Condensate recovery and treatment

Our experience in the water treatment and utilities combined with the wide range of technologies and equipment available in-house, give us a full coverage of the different needs connected to condensate treatment and recovery.

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[ Piping fabrication and skid assembly shop ]

Our own facility for manufacturing and assembling complete packages is part of our scheme of Vertical Integration to provide quality and value to our customers.

Unidro’s shop area for skid assembly is located about 25 km away from Milano and from Unidro Head Office.
The shop is fully equipped with the necessary structures to carry out piping fabrication activities, structures construction, goods handling and stocking, skid and plant assembly and testing.

Some numbers

Workshop: 4100m²
Electrical Panels Fabrication: 220m²
Office: 630m²
Outdoor Storage: 1500m²

The quality

UNI EN ISO 9001:2008 Certifying Authority: TUV
UNI EN ISO 14000 Certifying Authority: TUV
UNI EN OSHAS 18000 Certifying Authority: TUV
Welding Procedures Record Qualifications according to EN and ASME Certifying Authority: Lloyd’s Register, BV, TUV

What we do

Qualified welders, assemblers, pipe makers, smith-carpenters, electrical and instrument fitters form a team able to carry out all the activities connected to the realization of modular plants and skid-based packages.

Our software engineers can manage complete FAT with customer for a full check of package features prior to delivery.

Biomass Power Plant

Copenhagen’s ambition is becoming the world’s first CO2-neutral capital by year 2025, and the whole project was born as environmental-friendly.

North Field East Project (NFE)

Unidro has been awarded the water treatment packages by CTJV, a joint venture of Chiyoda Corporation (Japan) and Technip Energies, for the North Field East Project (“NFE”). The NFE Project covers the delivery of 4 mega trains, each with a capacity of 8 million tons per annum (“Mtpa”) of Liquified Natural Gas (“LNG”), and associated utility facilities.

Southern US

The availability of low cost natural gas has reduced operating costs of large petrochemical plants down to modern day record lows which has created a “once in a century opportunity” for the petrochemical industry.

KNPC

This is one of the strategic mega-projects of Kuwait National Petroleum Company (KNPC) with the goal to upgrade and expand the two existing KNPC refineries at Mina Abdulla (MAB) and Mina Al-Ahmadi (MAA).

Papua New Guinea LNG Project

Started in 2008 and completed in 2014, Papua New Guinea (PNG) LNG project is an integrated development that is commercializing the gas resources of Papua New Guinea.

Rasgas, LNG and Gas Processing Trains, Ras Laffan (Qatar)

Ras Laffan Liquefied Gas Company (Rasgas) was established in 1993 by Qatar Petroleum and ExxonMobil.

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[ Pressure equipment shop ]

As part of Unidro scheme of Vertical Integration intended to provide quality and value to our customers, we manufacture our engineered pressure equipment in our own facility.

Located 20 km away from Milano and from Unidro Head Office, the features and the equipment of the workshop, the professional capability and record of the personnel, the qualifications and the certifications the company can boost place our production in the high range of the market for industrial pressure equipment.

Quality

UNI EN ISO 9001:2008
ASME U-STAMP
NATIONAL BOARD
Welded Pressure Vessels Class 1, Class 2.1
Welding Procedures Record Qualifications (according to EN and ASME)
Welding Operator Qualification

Some numbers

covered area 3,000 m2
uncovered area 2,000 m2
Vessel diameter 4.5 mt
Vessel length 25 mt
Weight 70 tons (with additional cranes)
Welding capacity 200mm

What we do

Heat exchangers of different type and material of construction
Vacuum degasifiers, ejectors and vacuum groups
Phase separators, Flash Drums
Thermal deaerators, , strippers
Vane Separator, Cyclone Separator, Wire Mesh Separator
Cartridge Filter, Basket Filter
Carbon Canisters
Direct & Indirect Heaters
Reboiler Combustion Chamber

Biomass Power Plant

Copenhagen’s ambition is becoming the world’s first CO2-neutral capital by year 2025, and the whole project was born as environmental-friendly.

North Field East Project (NFE)

Southern US

KNPC

Papua New Guinea LNG Project

Started in 2008 and completed in 2014, Papua New Guinea (PNG) LNG project is an integrated development that is commercializing the gas resources of Papua New Guinea.

Rasgas, LNG and Gas Processing Trains, Ras Laffan (Qatar)

Ras Laffan Liquefied Gas Company (Rasgas) was established in 1993 by Qatar Petroleum and ExxonMobil.

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[ Unidro Products for Flotation ]

Dispersed oil may be efficiently removed from contaminated water by means of flotation, i.e. by injecting a suitable amount of gas. Usually air is used but when oxygen should not be added to the water to limit corrosion or also to avoid potentially explosive gas mixtures nitrogen or fuel gas can be chosen.

Unidro has know-how to size, design and fabricate different type of flotators.

Induced Gas Flotators IGF/IAF

Both turbine type and ejector type flotators are available.

Mostly applied for treating produced water, when a coars deioiling is required, Unidro IGF are efficient and simple and can treat large flowrate.

Dissolved Gas Flotators (DGF or DAF)

Dissolved air flotator is very effective in removing finely dispersed oil and light suspended solids. Their application includes refinery oily water, biologically treated effluents, produced water and open drain. The system includes gas saturation vessel and recirculation pump. We have rectangular or circular DAF, tank in concrete or steel.

Vertical Type Flotators (CFU)

Increasingly stringent environmental discharge requirements plus the constant pressure to reduce equipment footprint have led to the development of the Compact Flotation Unit (CFU). Unidro has brought the experience on traditional flotators ahead to match this new challenge as well.

The complete in-house design and fabrication

The complete equipment, vessels, ejectors, distributors and skimmers as well as the structural internal parts are manufactured and assembled in our shop, which is qualified by National Board and U-Stamp holder. The extent of shop pre-assembly is evaluated case by case, with our customers.

Produced water treatment

With experience in water treatment, a wide separation equipment portfolio and a specific know-how on wellhead processes Unidro is a highly qualified partner for PWT.

Waste water treatment and reuse

With a wide experience in the treatment of industrial wastewater and the knowledge to treat difficult process streams, we can match the most demanding regulations worldwide and handle the critical problem of water reuse.

Cartridge Filters

Nutshell filters

When the issue is the removal of oil and suspended solids form difficult water streams, the Nutshell Filters often represents the most efficient and reliable treatment technology.

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[ Precoat Filters ]

The Process Principle

Precoat filtration is used in order to prevent filter elements from clogging and to secure fine filtration efficiency. Filter elements are protected by depositing on their surface a layer of precoat material (normally cellulose, diatomaceous earth, or similar), prior to filtration. For this purpose, precoat slurry is introduced into the filter vessel prior to start the filtration process.

Generally precoat filtration is used in the treatment of lean amines slip streams, saturated brine for chloralkali plants and turbine condensate return streams.

Precoat Filters – Candle Type

The Unidro candles precoat filters consist of a vertical cylindrical vessel with conical bottom, with filtering candles fixed at their top on horizontal nozzle sheet or collecting manifolds.
The backwash procedure may be different for each application and project requirements. The Unidro systems can be designed for slurry discharge or dry discharge, the latter involving a drying gas stream which allows delivering a dry cake for disposal.

Precoat Filters – Leaves Type

The Unidro leaves precoat filters consist of a horizontal cylindrical vessel, equipped with circular filtering leaves installed on a central internal collecting header.
The filtering elements are vertical round leaves, which can filter inward through each side. They are hold by a central shaft, which also acts as filtered liquid collector.
When the washing procedure starts, the shaft rotates the filtering leaves. A strong blade jet on the rotating filtering leaves cleans them effectively.

Lean amine treatment

Alkanolamines such as MDEA or DGA are solvents of common application in gas sweetening plants.

Brine purification

In chlor-alkali production plants based on membrane electrolysis, the feed sodium chloride (or potassium chloride) brine must be treated to a very high quality i.e. no suspended solids and very low residual hardness is admitted.

Cartridge Filters

Media Filters

Unidro Media Filters can remove more than 95% of suspended solids down to few microns size and traces of insoluble hydrocarbons.

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[ Hairpin-Type Heat Exchangers ]

The principle

Hairpin exchangers are jacketed ‘U’ tube exchangers operating in a true countercurrent flow, allowing also temperature cross (hot fluid outlet temperature is below cold fluid outlet temperature) with a very efficient design.

Another important feature of hairpin exchangers is the closure type, which allows the removal of the tube bundle and accommodate thermal expansion without requiring expansion or packed joints.

The configurations

Hairpin exchangers are available in two configurations: a single tube (Double-pipe) or multiple tubes (Multi-tube) within the shell.

Double-pipe heat exchangers utilize a single pipe-within-a-pipe design and are commonly used for high fouling services, such as slurries where abrasive materials are present, and for smaller duties. Standard shell diameters range from 2” to 6”.
Multi-tube heat exchangers are used for larger duties, with standard designs for shell diameters up to 30”.

Finned tubes, U-tubes, straight tubes (with rod-thru capability), fixed tubesheets and removable bundle are also options.

Advantages

Process advantages: Hairpin units are preferable and more economic than TEMA-type for extreme temperature crossing, high pressure, low pressure drop, high temperature
Operation and maintenance advantages: easy mechanical cleaning on the shell side thanks to the removable bundle
Flexibility: Double Pipe Hairpin can accommodate streams flow rate or other conditions change. Unlimited numbers of sections can be re-arranged in parallel and series to fit new conditions

Process Filters

Unidro process filters cover a wide range of application for gas and hydrocarbon filters, including solid removal from gas and liquid, liquid/gas and liquid/liquid separation.

Produced water treatment

With experience in water treatment, a wide separation equipment portfolio and a specific know-how on wellhead processes Unidro is a highly qualified partner for PWT.

Flotators

Dispersed oil may be efficiently removed from contaminated water by means of flotation, i.e. by injecting a suitable amount of gas.

BTEx stripping

BTEX (Benzene, Toluene, Ethyl Benzene and Xylenes), are one of the most water soluble Hydrocarbon processed in a typical Oil & Gas field.