Advantages of Using Oxygen and Propylene, compared to Oxygen and Acetylene
Safety:
– Lower Flammability Range. Propylene has a narrower flammability range compared to acetylene, making it safer to use and store.
– Non-toxic: Propylene is less toxic than acetylene, which reduces health risks for workers.
– Stable Storage: Propylene can be stored in liquid form at relatively low pressures, while acetylene must be dissolved in acetone in special cylinders to prevent explosive decomposition.
Cost:
– Lower Cost: Propylene is generally cheaper than acetylene. This cost advantage can be significant in large-scale operations.
– Lower Cylinder Rental Costs: Propylene cylinders tend to be more affordable to rent compared to acetylene cylinders.
Equipment Longevity:
– Reduced Wear and Tear: The combustion of propylene produces less carbon soot, which can prolong the life of torch tips and other equipment components.
Versatility and Efficiency:
– Heat Distribution: Propylene produces a broader and more even heat distribution, which is beneficial for brazing and heating large surfaces.
– Higher Total Heat Output: Although acetylene has a higher flame temperature, propylene can deliver more total heat due to its higher combustion energy, making it effective for cutting thicker materials.
Equipment Required
Common Equipment for Both:
– Oxygen Regulator: Controls the flow of oxygen from the cylinder.
– Torch Handle: The main body of the torch where the gases mix and are controlled.
– Hoses: Flexible tubing to transport gases from the cylinders to the torch.
Specific Equipment for Propylene:
– Propylene Regulator: Specifically designed to handle the properties and pressure of propylene.
– Cutting Tips: Specially designed tips for the torch to accommodate the different flame characteristics of propylene.
– Flashback Arrestors: Safety devices to prevent flashbacks, must be compatible with propylene.
Setup Process
Cylinder Placement:
– Secure the oxygen and propylene cylinders in an upright position using cylinder carts or stands to prevent them from tipping over.
Regulator Installation:
– Attach the oxygen regulator to the oxygen cylinder and the propylene regulator to the propylene cylinder. Ensure the connections are tight and secure to prevent gas leaks.
Hose Connection:
– Connect the oxygen hose to the oxygen regulator and the torch handle.
– Connect the propylene hose to the propylene regulator and the torch handle.
– Use color-coded hoses (typically blue for oxygen and red for propylene) to avoid confusion.
Check for Leaks:
– Open the cylinder valves slightly to pressurize the system and use a soapy water solution to check for leaks at all connections. Tighten any connections if bubbles are observed.
Torch Tip Installation:
– Attach the appropriate cutting or brazing tip to the torch handle. Ensure the tip is securely fastened to prevent gas leakage.
Pressure Adjustment:
– Open the cylinder valves fully.
– Adjust the regulators to the recommended operating pressures for oxygen and propylene. Typical settings might be around 20-30 psi for oxygen and 5-15 psi for propylene, but always refer to the manufacturer’s guidelines.
Ignition:
– Open the propylene valve on the torch handle slightly and ignite the gas using a spark lighter.
– Gradually open the oxygen valve on the torch handle to adjust the flame to the desired intensity and shape, achieving a neutral flame for most operations.
Operational Checks:
– Perform a final check of the flame and adjust the regulators and torch valves as necessary for optimal performance.
Summary
Switching to an oxygen and propylene setup for heating, cutting, and brazing can offer numerous advantages, including enhanced safety, cost savings, extended equipment life, and efficient heat distribution. While the basic setup process and equipment required are similar to an oxygen and acetylene system, specific components like regulators and torch tips must be suited for propylene to ensure safe and effective operation.
