Free-flow helmet

Free-flow helmet is a type of diving helmet used in commercial diving and underwater diving. It is designed to provide a continuous flow of breathing gas to the diver, hence the name "free-flow".

Design and Function

The free-flow helmet is typically made of durable materials such as stainless steel or fiberglass to withstand the harsh underwater environment. It is equipped with a non-return valve that ensures a constant supply of fresh air, preventing the buildup of carbon dioxide inside the helmet. The helmet also includes a communication system that allows the diver to communicate with the surface team.

The primary function of the free-flow helmet is to provide a safe and efficient breathing environment for the diver. The continuous flow of gas helps to maintain a positive pressure inside the helmet, preventing water from entering. This is particularly important in deep-sea diving where the pressure can be several times greater than at sea level.

Usage

Free-flow helmets are commonly used in commercial diving operations such as underwater welding, underwater construction, and salvage operations. They are also used in scientific research and military operations. The helmet's robust design and reliable performance make it a preferred choice for demanding underwater tasks.

Advantages and Disadvantages

The main advantage of the free-flow helmet is its ability to provide a constant supply of fresh air, reducing the risk of hypoxia and hypercapnia. It also offers superior protection against impacts and falling objects compared to other types of diving helmets.

However, the free-flow helmet also has some disadvantages. The constant flow of gas can lead to a rapid consumption of the air supply, requiring careful management of the gas reserves. The helmet can also be quite heavy, which can cause fatigue during long dives.

See Also

• Diving suit
• Scuba diving
• Underwater breathing apparatus