Odorizer

Odorisation serves as a safety measure when using otherwise odorless gases and referred to the addition of odorants ( odorants ), which should have as a typical odor of danger odor.

Odorisation of natural gas and other fuel gases

Odorisation of natural gas and other fuel gases is an important security measure in the internal gas installation for gas customers. Enable the customer to notice leaks or faulty equipment quickly, the odorless by nature natural gas warning odors are added. For this purpose usually be volatile, typically smelling organic sulfur compounds such as tetrahydrothiophene (THT ), whose smell is reminiscent of the rotten eggs, and mercaptan used. Odorisation 280 part 1 of the DVGW worksheet G - described 3.

For some time a sulfur-free odorant with the trade name Gasodor S-Free is a mixture of more than 50 % of ethyl acrylate and methyl acrylate and 2-ethyl -3- methylpyrazine is used. This has a solvent- like odor, which is nevertheless brought under investigations by the DVGW of subjects with natural gas connection. The efficacy of this agent is controversial. The odorants are described in Practice G 281.

Since in a slowly emerging, initially small gas leak is a risk of habituation to the odor of Odorierungszusatzes, this admixture is often greatly increased at regular intervals. One then speaks of a Stoßodorierung.

Odorising extinguishing gases

In inert gas extinguishing systems usually a smelling of lemon odorant is used which makes the odorless gas extinguishing perceptible. If there is a danger that in low, unventilated spaces, such as in pits of presses and cellars of hydraulic equipment, can be injured by escaping quenching gas, it is prescribed in Germany to BG rules to odorize the extinguishing agent for odor perception by additives. In high- pressure inert gas extinguishing systems, the odorant is already added to the extinguishing agents while filling in the high -pressure gas cylinders in low-pressure inert gas extinguishing systems the quenching gas is added to the odorant until the erase operation by a so-called Odorierungseinrichtung.

Odorisation of oxygen for welding and cutting

Odorisation of oxygen for welding and cutting is made when there is a danger to enrich tight spaces with combustible gases or oxygen, because even a small increase in the proportion of oxygen in the air compared to the normal state by 21 percent by volume increases the flammability even flame retardant substances (eg as flame resistant protective clothing) and significantly increases the combustion rate and temperature.

Odorisation of formaldehyde, 1,2- dichloroethane or benzenes with Trichloronitromethane

Due to strict EU regulations (Directive 2000/29/EC ) to protect against the introduction of harmful organisms container, goods or packaging materials are often fumigated wooden overseas in the exporting country. The most commonly introduced gases are methyl bromide (90 %), sulfuryl fluoride, phosphine and formaldehyde. In addition, in the production of certain goods or other treatment substances are used which release gases during transport in health hazardous concentrations.

So far, proven gases hazardous to health in concentrations are benzene, formaldehyde, 1,2- dichloroethane. It serves Trichloronitromethane ( in all probability ) for odorising of fumigants and as an indication of ausgedünstete gases of the goods. Particularly common container with shoes (benzene ) and textiles ( formaldehyde) are affected by the excesses over the limits.

After finding these containers should be moved to ArbSchG adequate ventilation.

Analysis

For determining the concentration of odorants chromatography, ion mobility spectrometers or olfactometry used.

Swell

• Gas Technology
• Safety measure