Vademecum

Here the description of an SCR to MCCR plus a dive in the Netherlands

A rebreather learner’s guide, by Dr. Richard Pyle

The operation of a CMF valve in detail

Read here about the principles of constant mass flow, an article by Nevil Adkins

Expert diver and rebreather builder Kevin Gurr explains the facts and fiction about rebreathers and Co2

How do semi-closed rebreathers work?

ECCR explained

In 2002, Pete Steggle made one of the first temperature sticks for measuring at the scrubber

Stages, your life-saver

The position of the counterlung

What should you pay attention to when choosing a valve for pure oxygen?

Some interesting information on diving cylinders

Can you tell from the cylinders which rebreather you are dealing with?

Why does an air spray can become cold when emptied and a scuba bottle become hot when filled?

The BOV, a lifesaver and luxury safety device

The rebreather mouthpiece plays a crucial role in the gas routing and safety of the diver.

Information about Full Face Masks FFM for rebreather divers

Where can I get training to learn to dive with a rebreather?

This article on scrubbers describes only part of the current knowledge on carbon dioxide absorbing systems. These descriptions cover scrubbers for breathing systems in mining as well as systems for underwater use.

Oxygen rebreathers based on a chemical process are among the oldest types. The system uses chemicals that absorb CO2 and generate oxygen. As early as 1930, a whole series of devices under the name Naszogen was put on the market in Germany.

Liquid oxygen has been used in breathing systems since the 1920s. The principle is relatively simple. Liquid oxygen has a temperature of approximately -185 degrees Celsius (-301 F) and will evaporate at room temperature.

Most oxygen rebreathers use a simple single counter lung. Materials used in the early days are finely-woven fabrics, impregnated with rubber or latex.

Split counterlungs are used when there are two counterlungs, one for the inhaled gas and one for the exhaled gas.

The most characteristic external feature is that a rebreather user uses a breathing hose with an inlet and an outlet. With the exception of oxygen rebreathers, almost all modern rebreathers have separate counter lungs and separate hoses for supply of oxygen-rich gas and removal of Co2-rich gas.

Counter lungs are in most cases made of flexible materials. In some special cases the designer chooses for a more rigid material.

This post is about the routing of breathing hoses. This technique has also created a special rebreather for underwater use, which is specifically used for narrow passages underwater.

Single hose systems are always pendulum systems. The original oxygen rebreather often had a single hose because this was constructively attractive.

We distinguish different types of counterlungs used with rebreathers. On land, the choice of whether the counter-lung is worn on the chest or the back will make little difference to the breathing resistance.

In 1920, the first rebreather was developed that operated with a then new mechanism. Until then, the supply of oxygen to the breathing circuit had been reserved for regulators that injected gas continuously, or by manually operated valves.

For applications requiring entering a room with high temperatures or breathing for long periods from a closed system, the temperature in the breathing circuit can become higher. For this reason, since 1930 some breathing apparatus has been equipped with an integrated cooler.

In 1920, the first rebreather was developed that operated with a then new mechanism. Until then, the supply of oxygen to the breathing circuit had been reserved for regulators that injected gas continuously, or by manually operated valves.

The use of manual addition in oxygen rebreathers is the oldest form of adding oxygen to the loop.

Oxygen rebreathers with build in scrubber placed in the couter lung.

This part with the theory of oxygen rebreathers deals with the technical principle of a constant mass valve.

I made this page because there were many questions in newsgroups about gas flow through an orifice. Many people are now developing manually operated constant-dosis rebreathers.

This page deals with the various design aspects of oxygen rebreathers. The page is a living page and can be completed with knowledge of the readers.