In the EN 13949 standard, which is a European standard, the requirements and marking methods for the independent open circuit compressed nitrox underwater breathing apparatus are explained and the test methods are defined. Nitrox is a mixture of oxygen and nitrogen, primarily used by divers as a breathing gas. This mixture contains a lower percentage of nitrogen than normally found in air, especially to reduce the risk of hail.
The EN 13949 standard contains requirements for nitrox SCUBA in addition to the requirements described in the EN 250 standard in general. The purpose of the requirements and tests described in the EN 13949 standard is to ensure a minimum level of safe operation of the nitrox mixture used, down to the maximum workable depth for the apparatus.
Open circuit self-contained compressed nitrox or oxygen underwater breathing apparatus with a portable source of compressed nitrox and oxygen carried by the diver, allowing him to breathe underwater and exhale into ambient water. When this device (SCUBA) is ready for use, it consists of a number of compatible sub-parts, each of which complies with the requirements of this standard.
Open circuit self-contained diving apparatus is basically known as air breathing apparatus. There are many types of such devices. In addition to the hose and SCUBA types, they are grouped according to the number of pressure reduction stages to be achieved in the demand valve:
Two-stage pressure reduction systems are grouped as follows:
In general, a two-stage pressure relief hose attachment is recommended for diving activities. SCUBA is used as escape device. The main interest of open-circuit independent diving apparatus construction is the demand valve. This valve reduces the pressure in the supply hose to the ambient pressure of the dive depth.
Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization also provides open circuit independent diving apparatus testing services for use with compressed nitrox and oxygen, within the scope of EN 13949 standard, with its trained and expert staff and advanced technological equipment. .
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