One of two methods in a fiber optic network installation is to lay the cable into place: blowing or pulling.
In this article, we’ll guide you through the entire fiber optic cable blowing procedure, highlighting the essential tools, the advantages over traditional methods, and the common challenges faced during installation.
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What Is the Fiber Optic Cable Blowing Procedure?
In fiber optic cable blowing, high-speed airflow is combined with a mechanical pushing force to produce the installation, known as blowing or jetting. This is the preferred method for pushing fiber optic cable through a pre-installed conduit.
Several hundred meters of cable are pushed into the duct before compressed air is injected into the duct inlet.
The fiber optic cable is attached to a blowing head with two seals that grip it tightly. As the air pressure builds up, the jetting motion pushes the cable through the conduit.
Maximizing Its Performance
Friction Reduction
Always opt for a fiber optic cable with a low friction coefficient (between the cable outer surface and the duct inner wall).
This will reduce the compressed air that pushes the cable through the conduit. Blowing lubricants such as oil can also reduce friction.
Conduit Size
The size of the conduit through which you’re blowing the cable is important. Choose a conduit slightly larger than the fiber optic cable. The cable will be to be blown into place with ease and require less compressed air.
Air Pressure
Too much air pressure from the blowing equipment can damage the fiber optic cable. Use the minimum pressure to push the fiber optic cable through the conduit.
Temperature
Temperature is an important factor in your installation. If the fiber optic cable is too cold, the cable jacket may become brittle and be more likely to break. Similarly, if the air is too cold, it will condense and freeze, damaging the fiber optic cable.
Air Flow
Use an air compressor with a high flow rate. This will help to reduce the pressure drop as the air moves through the system. If you need more clarification, conduct a pressure test solution before you begin.
Cable Length & Flexibility
The length of the fiber optic cable will determine the amount of time it takes to install. Some cable manufacturers specifically advertise their fiber optic cables as ideal for a blowing installation.
Duct Type
The duct size and type will also impact the ease of installation. It’s easier to install a fiber optic cable in a duct system with a smaller diameter than a larger diameter.
Duct Connectors
Pay attention to the connectors if the fiber optic cable is installed in an existing duct. Make sure they’re sealed tight so air can’t escape. This will also help to reduce the pressure drop and increase the efficiency of the installation.
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Blowing vs Pulling Cables: Which is Better?
The fiber optic cable blowing process is often preferred for installations due to its numerous advantages over the pulling method.
It minimizes damage to the cable, reduces the risk of jams in the conduit, and is faster, saving on manpower and resources.
However, using a pulling eye and a winch may be more suitable in certain situations.
Lack of Air Pressure
If the fiber optic cable is to be installed in a long conduit, it may be difficult to generate enough air pressure to accommodate the required blowing distance.
In this case, pulling would be a better option.
Installation Method Around Bends
The fiber optic cable blowing method is appropriate during the installation process because it avoids obstructions or bends. However, knowing the minimum bend radius of your cable can help you plan accordingly to avoid unnecessary obstructions during construction and installation.
The Network Installers can advise you on the best installation method if you need more clarification. We are supplying passive components for the fiber optic installation process.
Installation Process in Live Environments
Suppose the fiber optic cable will be installed in a live environment. In that case, it is often better to pull the cable as this minimizes the risk of disruption to your telecommunications service.
How Do You Bury Fiber Optic Cable in a Blowing Installation?
In a fiber optic installation, the cable is typically laid in an underground conduit to protect the cable jacket.
The blowing head is inserted into the conduit, and the fiber optic cable is fed through it. The air pressure from the compressor pushes the fiber optic cable through the conduit and into place.
How Do You Pull Fiber Optic Cable Through a Conduit?
In comparison, if you’re completing a pulling installation, a fiber optic cable is attached to a pulling head, with two seals that grip the cable tightly.
The pulling head is inserted into the conduit, and the fiber optic cable is fed through it. The air pressure from the compressor pulls the fiber optic cable through the conduit and into place.
Essential Fiber Optic Cable Blowing Procedure Equipment
- An air compressor creates the pressure to push the fiber optic cable through the conduit.
- A fiber optic cable will be blown through the conduit.
- A blowing head is a device that attaches to the fiber optic cable and allows it to be blown through the conduit.
- A duct is a pipe through which the fiber optic cable will be blown.
- A conduit is the length of pipe through which fiber optic cable will be blown. Fiber installation requires careful coordination of these components to ensure efficient and effective deployment.
Its Benefits on Fiber Optical Networks
- Speed of Installation: Allows for rapid deployment over long distances.
- Reduced Risk of Damage: Minimizes stress on cables, preventing physical damage.
- Longer Installation Lengths: Supports longer cable runs without joins or splices.
- Cost-Effectiveness: Decreases labor costs and enhances installation efficiency.
- Higher Cable Density: Maximizes the use of conduit space.
- Less Intrusive to Environment: Minimizes ecological disruption during installation.
- Compatibility with Various Cable Types: Adapts to different cable sizes and duct requirements.
FAQs
Is there a limit to the distance a cable can be blown?
The distance achievable by cable blowing depends on factors like duct condition, cable diameter, and the blowing equipment used. In optimal conditions, distances of up to 2,000 meters can be achieved.
What are the typical pressures used in cable-blowing machines?
The air pressure used can vary depending on the job and the equipment’s specific requirements, but it generally ranges from 10 to 15 bars. Proper calibration is crucial to ensure efficient and safe cable installation.
Learn More About the Fiber Optic Cable Blowing Method
If you have any questions about the fiber optic cable blowing procedure as part of a new installation or a cable repair project, please don’t hesitate to contact The Network Installers.
We offer comprehensive services for fiber optical networks and can provide efficient and innovative solutions to solve complicated tasks.
We’ll discuss the best options based on your individual fiber optic network configuration. Contact us today.
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