Hailey Tran
Oxygen is essential for human life, and hospitals require a constant supply of it for various purposes, including patient care, diagnostics, and equipment sterilization. While oxygen has traditionally been delivered to hospitals from cryogenic sources, on-site oxygen generation has emerged as a viable alternative. This method, known as Pressure Swing Adsorption (PSA), offers significant cost savings and a continuous oxygen supply with steady purity and pressure. Hospitals can install oxygen generators equipped with digital analyzers to monitor and maintain oxygen purity, ensuring uninterrupted oxygen supply for their critical operations.
| Characteristics | Values |
|---|---|
| How it's made | Industrial facilities freeze air so oxygen and nitrogen separate, allowing liquid oxygen to be formed. Ambient air is also taken at PSA plants and nitrogen is separated from oxygen, which is left in gas form. |
| Storage | Liquid oxygen is stored in giant tankers or bulk tanks. Hospitals typically rely on large liquid medical oxygen (LMO) supplies as their primary source. |
| Transportation | Liquid oxygen is transported in tankers or trailers. |
| Conversion to gas | Liquid oxygen is converted to gas when it is needed. Vaporizers convert liquid oxygen from bulk tanks into gas to feed the healthcare facility’s oxygen pipeline system. |
| Purity | Medical oxygen must be at least 82% pure and exceed 99.5% purity. |
| Contaminants | Medical oxygen must be free from contaminants and foreign odors. |
| Prescription | A prescription is required for medical oxygen. |
| Safety | Oxygen isn't flammable but can cause explosions and increase the intensity of fires. It can also cause cryogenic burns and frostbite if handled incorrectly. |
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What You'll Learn
Freeze air to separate nitrogen and oxygen, forming liquid oxygen
The process of separating nitrogen and oxygen by freezing air is known as fractional distillation. It is the most common method for air separation and is used to produce medical oxygen for hospitals. Atmospheric air is cooled to −181°C, which is below the boiling point of oxygen, causing it to liquefy. Since the boiling point of nitrogen is −196°C, it remains in a gaseous state.
This process is typically carried out in cryogenic air separation units (ASUs) designed to provide nitrogen or oxygen. The atmospheric air is compressed and cooled to a liquid state, and then the liquid oxygen is extracted. One liter of liquid oxygen provides approximately 860 liters of gaseous oxygen, making it a highly efficient system for transportation and storage.
The liquid oxygen is then transported and stored in large, highly insulated containers called vacuum-insulated evaporators. These containers are specifically designed to safely and economically transport and store liquefied gases at cryogenic temperatures. The liquid oxygen is stored at a pressure of approximately 130 psi.
When the liquid oxygen is needed, it is withdrawn from the storage container and routed through a vaporizer that converts it back into a gas. It then passes through a series of regulators that reduce the pressure to the hospital working pressure of approximately 50 psi. Copper alloy pipework is used to supply the medical-grade oxygen to the required location within the hospital.
This process of freezing air to separate nitrogen and oxygen, forming liquid oxygen, is a crucial step in ensuring a stable and pure oxygen supply for hospitals, particularly during times of increased demand, such as the COVID-19 pandemic.
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Convert liquid oxygen to gas using a vaporizer
Hospitals typically rely on large liquid medical oxygen (LMO) supplies as their primary source. LMO is produced by the process of fractional distillation in air separation units. In this method, gases from the air are separated into various components after cooling them to a liquid state, and then liquid oxygen is extracted. Atmospheric air is cooled to −181°C, the temperature at which oxygen liquefies.
Liquid oxygen is stored in a vacuum-insulated evaporator, a double-walled large insulating flask. As liquid oxygen evaporates, its mass decreases, reducing the pressure at the bottom of the container. To prevent this, a safety relief valve opens when there is less demand, allowing the pressure inside the vessel to rise. The inner vessel is maintained at a pressure of approximately 130 psi.
To convert liquid oxygen to gas, it is withdrawn from the vessel and routed through a vaporizer. Vaporizers convert the liquid oxygen into a gaseous state. A pressure control manifold then controls the gas pressure that is fed to the process or application. The gas is then supplied through a series of regulators that reduce the pressure down to the hospital working pressure of approximately 50 psi. Copper alloy pipework is used to supply the individual medical gases to the required location.
It is important to note that oxygen can exist in solid, liquid, or gaseous states, depending on pressure and temperature. Any gas can be made into a liquid if it is cold enough and under enough pressure. Gaseous oxygen is safe to breathe, and liquid oxygen can be warmed up slowly and converted back into a gas to be used in hospitals.
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Store oxygen in tanks, ensuring it's free of contaminants
Oxygen is a very reactive gas and can intensify fires when in contact with incompatible substances or heat. It is an oxidizer, which means that it will accelerate a fire if introduced at a higher content than exists in the air. For example, an oxygen tank explosion at a Baghdad hospital killed at least 82 people and injured 110. Therefore, it is important to store oxygen in tanks safely and securely.
Firstly, ensure that the equipment used is specifically designed for oxygen service. Check with the supplier if you are unsure about your equipment’s compatibility with oxygen. It is a requirement that workers fully understand the risks and hazards of using oxygen.
Secondly, when storing oxygen tanks, ensure they are at least 20 feet (6.1 m) from the kitchen, open flames, heat sources, and combustible materials such as paint, grease, and oil. Store cylinders in a well-ventilated location and secure them against theft. Post 'No Smoking' signs at your door to alert anyone entering that it is an oxygen-rich environment. Ensure you have easy access to a fire extinguisher and that your smoke detectors are in working order.
Thirdly, secure all compressed gas cylinders in racks, stands, or on flat floors to prevent them from tipping over and becoming damaged. Keep cylinders upright whenever possible. If you must store cylinders horizontally, ensure they can’t roll into other cylinders or objects. Regularly inspect your cylinders for damage or leaks.
Finally, clearly label full, partial, and empty cylinders with appropriate identification. This can be done through an integral pressure gauge, individual signage, or separated group signage (for cylinders being stored together). Empty cylinders shall be marked as such to avoid confusion and delay if a full cylinder is needed in a rapid manner.
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Transport oxygen in tankers, maintaining cryogenic temperatures
Cryogenic transportation is a process that involves storing, handling, and moving materials at extremely low temperatures, typically below -150 °C. This process is crucial for transporting oxygen for medical use, as it needs to be kept at -185 °C to maintain its liquid state. Cryogenic transportation enables the safe and efficient transfer of liquefied gases, such as liquid oxygen, ensuring that it remains stable during transport.
To transport oxygen in tankers while maintaining cryogenic temperatures, specialized containers called cryogenic tanks are used. These tanks are designed with advanced insulation materials and vacuum spaces to minimize heat transfer and preserve the required low temperatures. The construction of a cryogenic tank is similar to a vacuum bottle, with an inner and outer vessel. The air between the two vessels is removed to act as an insulating medium, preventing heat from reaching the liquid oxygen inside.
Cryogenic tanks are essential for transporting oxygen due to its highly reactive nature. Oxygen reacts with almost all organic materials and metals, and its ignition can lead to dangerous fires. Cryogenic tanks are specifically designed to prevent oxygen from igniting by maintaining the ultra-low temperatures required. Additionally, these tanks are equipped with multiple pressure relief devices to handle the enormous pressure created during the vaporization of liquid oxygen.
The process of loading oxygen into cryogenic containers is carefully executed to maintain cryogenic temperatures. Specially designed vacuum jacketed pipes are used to transfer oxygen directly from the source to the container. The use of cryogenic transportation ensures the efficient and safe transport of oxygen, allowing for its preservation and global distribution. This method is particularly important for the healthcare sector, as it enables the delivery of oxygen to hospitals, where it plays a critical role in medical treatment and oxygen therapy.
In summary, transporting oxygen in tankers while maintaining cryogenic temperatures involves utilizing specialized cryogenic tanks that are designed to withstand extremely low temperatures and prevent oxygen ignition. The loading process employs vacuum jacketed pipes to maintain temperature control. Cryogenic transportation is a complex and highly specialized process that ensures the safe and efficient distribution of oxygen for medical purposes.
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Ensure oxygen exceeds 99.5% purity and meets FDA requirements
To ensure oxygen exceeds 99.5% purity and meets FDA requirements, it is important to understand the standards and regulations set by the Food and Drug Administration (FDA). Here are the key steps and considerations:
Purity Standards
Medical-grade oxygen must meet or exceed a purity level of 99.5%. This standard is set by the FDA and other regulatory bodies to ensure the safety and effectiveness of oxygen used in medical settings. Pharmaceutical companies typically require oxygen purity to be between 90.0% and 96.0%. However, for medical use, higher purity is necessary to avoid any adverse health effects.
Contaminant-Free Oxygen
Medical oxygen must be free of contaminants. Even trace levels of contaminants can pose severe health risks when inhaled by patients. The FDA requires all medical oxygen cylinders to be contaminant-free before storing and issues specific guidelines to prevent contamination during the production, distribution, and storage processes.
Testing and Certification
Rigorous testing is required to ensure oxygen purity. Independent ISO-certified labs can verify the quality of medical oxygen. Regular testing is crucial to maintain purity standards, especially in medical environments. Additionally, proper testing and certification are necessary for classifying oxygen as medical-grade.
FDA Regulations and Compliance
The FDA sets strict parameters for medical oxygen regarding cleanliness and the elimination of harmful contaminants. They have established regulations for the production, labelling, and distribution of medical gases. These regulations include specific naming and colour requirements to accurately identify the contents of medical gas containers and reduce the risk of mix-ups. FDA compliance is mandatory for medical oxygen suppliers and manufacturers, who must adhere to current Good Manufacturing Practice (cGMP) regulations, particularly parts 210 and 211.
Prescription Requirements
The FDA requires a prescription for medical oxygen to ensure user safety. Medical oxygen is classified as a drug and is only intended for patients with specific medical needs. As such, a prescription from a primary care physician is necessary to obtain medical-grade oxygen. This regulatory step helps to ensure that medical oxygen is used appropriately and under the guidance of a medical professional.
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Frequently asked questions
The most common commercial method for hospitals to produce oxygen is the separation of air using either a cryogenic distillation process or a vacuum swing adsorption process.
The cheapest method for hospitals to produce oxygen is through the use of an oxygen generator, which costs around Rs. 10 per cubic meter.
The simplest method for hospitals to produce oxygen is to install an online oxygen generator, which provides a non-interrupted supply.
Oxygen can be produced using a variety of methods, including cryogenic distillation, vacuum swing adsorption, electrolysis, and photo-synthesis.
