Dry Ice Blasting
Dry Ice Cleaning / Blasting
Dry Ice is a solid form of Carbon Dioxide Gas. Depending on the high velocity of air, high kinetic energy, and the thermal differentials dry ice particles are propelled through a gun in dry ice Blasting to impact and clean the surfaces
Advantages :
- 100% water free
- Not Abrasive
- No Secondary Waste
- Easy cleaning for complex surfaces
- Elimination of chemicals and solvents usage in cleaning
- Avoidance of Drainage into Watershed/Storm Drains
- Avoidance of Sand/Grit Entrapment
Industries served by the Dry Ice Blasting :
- Turbines, compressors and heat exchangers tubes cleaning
- Electric Panels, motors, and switchgear cleaning
- Reformers, Reactors, and Crackers shell and coils cleaning
- Haters and Furnaces tubes and coils cleaning
- Air coolers and water coolers shell and tube cleaning
- Belt conveyors and chains cleaning in food Industry
For further information please see Buzwair partner in dry ice cleaning website.
Cryogenic Gas
Cryogenic Liquids
What are cryogenic liquids?
A cryogenic liquid is a liquefied gas with a boiling point temperature that is typically below [-150 oC]. Examples of gases that can exist as a cryogenic liquid include: Nitrogen, Oxygen, Argon, Helium, Neon, Krypton and Xenon. Liquid Carbon Dioxide is also referred to as a cryogenic liquid although it has a higher boiling point.
Buzwair Gases has the capability to produce high purity liquid and gaseous Nitrogen, Oxygen, Argon and Carbon Dioxide.
Production Process at Buzwair Gases
Cryogenic Liquid Nitrogen, Oxygen and Argon are produced from fractional distillation of air using air separation plants and techniques. These products are referred to as LIN, LOX and LAR respectively.
Liquid Carbon Dioxide (LCO2) is produced from a controlled combustion reaction between LPG and air using the most modern and state of the art technology, equipment and processes.
Air Separation for cryogenic liquid production
The raw material for cryogenic Nitrogen, Oxygen and Argon is air. The concentration of breathable air contains, by volume, approximately 78% Nitrogen, 20.9% Oxygen, 0.9% Argon, 0.03% Carbon Dioxide and the rest being moisture and rare gases. Air is withdrawn from the atmosphere through a dust filter by a multi-stage heavy duty air compressor unit. As air is compressed from stage to stage, the heat of compression is removed by heat exchangers using cooling water as the cooling medium.
The compressed air is further cooled using a refrigeration circuit to aid in removing moisture and carbon dioxide from the air. Moisture and carbon dioxide can cause blockages when the air is super-cooled as it will freeze and form dry-ice or ice blocks in the piping and distillation column. The air first pass through a moisture stripping unit that removes the bulk of moisture using metal-adsorption-desorption techniques before it passes through the Pre-Purification Unit (PPU) which removes the remaining moisture and carbon dioxide.
The compressed air that is chilled, moisture-free and carbon dioxide free, enters a super-heat exchanger which converts the air into cryogenic liquid air before it enters the distillation column. In the distillation column, the liquid air begins to separate into its individual components based on the thermodynamic properties of Nitrogen, Oxygen and Argon. The purity of the products leaving the distillation process is attained by continuous online analysis and reflux adjustments to ensure the highest purity is attained in the respective products. Liquid Oxygen (LOX) is directly obtained from the distillation column while high purity Liquid Nitrogen and Liquid Argon is obtained through additional purification, expansion and refrigeration of the respective gases leaving the column.
Due to the low boiling points of cryogenic liquids, the products are stored in vacuum insulated storage vessels.
Liquid Carbon Dioxide Production
Buzwair Gases produces high purity liquid Carbon Dioxide (LCO2) by a combustion reaction between LPG (Liquefied Petroleum Gas) and air in a reactor under controlled conditions. The initial product generated is referred to as flue gas and contains gaseous Carbon Dioxide (CO2) with other gas impurities which include Nitrogen, Oxygen, Argon and moisture. Through a series of purification processes involving the use of scrubber units, absorption towers and stripping columns, the final high purity gaseous CO2 is obtained. The CO2 gas is compressed and liquefied to obtain liquid Carbon Dioxide (LCO2). The final product is stored in special storage tanks with heavy-duty insulation to preserve the product and quality in its liquid phase.
Buzwair Gases can supply Liquid Nitrogen, Oxygen, Argon and Carbon Dioxide in the following packages to customers.
Product |
Purity [%] |
|---|---|
| Liquid Nitrogen (LIN) | > 99.999 % |
| Liquid Oxygen (LOX) | > 99.98 % |
| Liquid Argon (LAR) | > 99.999 % |
| Liquid Carbon Dioxide (LCO2) | > 99.97 % |
Delivery options
|
|
Purging and Inerting
Buzwair Gases provides safe and reliable purging and inerting services to customer’s industrial and maintenance requirements. Buzwair Gases proves its technical competence in providing safe and efficient purging and inerting services through successful longterm experience from customers in the oil and gas industry. Buzwair Gases supplies pure gas quality, certified equipment, accurate moisture level monitoring during the purging services, Buzwair purging team consist of highly qualified, experienced well trained personnel.
Purging
Purging is a short term process of replacing the air or hazardous gases in the space of a vessel and pipes by inert gas nitrogen. It is done either by displacement or dilution of the gases, depending on the type of vessel or equipment. Purging is mainly done during shutdown and startup of maintenance services or decommissioning of a process. It prevents the formation of combustible gas by lowering the oxygen content until it reaches the lower explosive limit.
- Dry-Out Procedure : Purging of heated nitrogen gas is used to lower the moisture level inside the vessel or pipeline to prevent the oxidation on the wall of a vessel.
- Cool-Down Procedure : For maintenance services, the shutdown of equipment and catalyst speeds up by nitrogen gas purging and lowering its temperature. It ensures a stable, non-reactive atmosphere during maintenance and change-over of a catalyst or reactor.
Inerting
Inerting is a long term procedure of displacing the atmosphere of a vessel such as fuel tanks and tankers with nitrogen gas. The flammable gas and air are replaced by an inert gas to lower the oxygen level in the space of a vessel and prevents unwanted combustion and the risk of explosion during storage or transportation.
Cylinder Maintenance and Hydraulic Pressure Testing
Seamless steel, aluminum and composite compressed gas cylinders requires periodic re-qualification process after certain years depending on the cylinder manufacturing standards.
Generally, the re-qualification process is divided into two sections:
Visual inspection :
- Before any work is carried out, the relevant cylinder data and its contents and ownership shall be identified. Each cylinder shall be cleaned and have all loose coatings, corrosion products, tar, oil or other foreign matter removed from its external surface.
- The external surface of each cylinder shall then be inspected for dents, cuts, gouges, bulges, cracks, lamination or excessive base wear heat damage, torch or electric arc burns Corrosion.
- Each cylinder shall be inspected internally also (with the valve removed), using adequate illumination to identify any defects.
Hydraulic Pressure Testing
- It is a hydraulic system to determine the volumetric expansion of seamless steel gas cylinders.
- When carrying out a pressure test, a suitable fluid, normally water shall be used as the test medium.
Buzwair Gases is one of few companies in the region which has an approved testing facility from Department of Transportation USA (DOT) since 2012. Our workshop is fully equipped with modern testing console, all the special tools and machines for steel shot blasting, internal cylinders drying, valving/de-valving, internal inspection and cylinders stamping.
Buzwair Gases installs first Liquid to Gaseous Nitrogen system for Laser in Qatar
Buzwair Gases Qatar has installed its first Liquid Nitrogen to Gas system in The State of Qatar July 2018.After long and intense negotiations to find the correct technical system at a suitable price level for both parties, Buzwair Gases and Pro- Suppliers signed a 5 year gas supply agreement to install a bulk nitrogen system that will give high purity nitrogen at high pressure and volume flow rates.Nitrogen is generally used when cutting stainless steel or aluminum in order to achieve excellent quality unlike oxygen, Nitrogen serves as a shielding gas in cutting light gauge materials to stop the burning process and allows the Laser to vaporize the material.
The system involved installing a 10,000 high pressure bilk liquid Nitrogen tank and vaporizing system that will feed nitrogen of 99.999% purity at 36 bar pressure.A stainless steel pipeline was installed from the Vaporisor and pipe routed from outside the main fabrication and cutting workshop of Pro-suppliers to a gas safety control system that controlled the flow and pressure of the nitrogen before entering into 2 Laser steel cutting machines.Buzwair Gases produces industrial, medical & speciality gases in the state of Qatar and was founded in 1954.
