Abonneer je op onze nieuwsbrief om op de hoogte te blijven
Klik hier
  • BLS Articles

Gases and vapours

Gases and vapours


Gases and vapours belong to those classes of substances that can threaten respiratory health and require specific regulations in the professional field.

 

Gases are characterised by their extreme volatility, as they are in an aeriform state at ambient temperature and pressure. (e.g. oxygen, nitrogen, carbon dioxide).

Oxygen, nitrogen and carbon dioxide are a few examples: their high kinetic energy produces random movements, giving this substance the advantage of moving from one place to another without hindrance.

 

Vapours, on the other hand, characterise substances that at ambient temperature and pressure are in a liquid or solid state and through processes of boiling or evaporation, pass to an aeriform state (e.g. acetone, toluene, hexane).

Acetone, toluene and hexane are some examples. Another example occurs when water is boiled: in this case it is called water vapour.

 

 

While sharing a gaseous origin, gases and vapours differ in a number of ways:

  • gases are invisible, but can be perceived by smell, whereas vapours are visible;
  • gases are the lowest form of state that can exist in matter, while vapours have an intermediate state between gas and liquid;
  • gases have a thermodynamic state at room temperature, while vapours exist as a mixture of two states at room temperature;
  • gases tend to disperse whenever there is a change in equilibrium, vapours remain the same even if the equilibrium state changes.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

What are inert gases?


Inert gases are toxic gases that do not support human respiration.

Inertisation limits the action of oxygen inside the system to prevent the formation of explosive atmospheres. Inertisation units are used when it is necessary to avoid:

  • emission of fumes into the atmosphere (contamination);
  • the entry of air into the plant (oxidation).

If materials are processed, whose exhalations combined with oxygen in the air result in the formation of an easily flammable mixture, any possible risk of explosion must be prevented. In practice, air is replaced by inert gas.

Inert gases are non-flammable substances which, because they do not react with combustibles, do not promote the ignition of fires.

Nitrogen, argon and helium are some examples and present some peculiar risks:

  • inert gases act without warning, as they are odourless, colourless and tasteless and therefore not easily detected;
  • asphyxiation by inert gases occurs without any premonitory physiological symptoms, or the victim often does not recognise the symptoms (dizziness, headache or difficulty in speaking, etc.);
  • inert gases act quickly and the speed of medical intervention is critical.

Inert gases are generally used to replace atmospheres containing oxygen (O2) or moisture (N2O) in order to protect products sensitive to the presence of these two components.

A substance that conveys a pungent, recognisable odour is generally added to the gases, thus increasing the level of safety for those exposed.

 

 

 

When does air become a hazard?


The air we breathe in the normal atmosphere has an oxygen content (%) at sea level ranging from a minimum of 19.5 % to a maximum of 23.5 %. 

However, in the presence of inert gases and oxygen deficiency (less than 18%), inhaled air ceases to be breathable to the point of causing asphyxiation and death to those exposed to it.

The severity of exposure to gases and vapours can vary from acute to chronic and the effect on respiratory health depends on the magnitude, duration of exposure and the specific agent.

Chlorine, phosgene, sulphur dioxide, hydrochloric acid, hydrogen sulphide, nitrogen dioxide, ozone and ammonia are among the most important irritant gases. Hydrogen sulphide is also a potent cellular toxin, which blocks the cytochrome system and inhibits cellular respiration.

A common exposure involves domestic mixing of ammonia with detergents containing bleach; this releases chloramine (NH2Cl), a highly toxic gas that when it comes into contact with mucous membranes decomposes and generates hydrochloric acid, which is toxic and corrosive, and free radicals, which are carcinogenic.

Acute exposure to toxic gases generally characterises industrial accidents, which occur as a result of the release of large quantities of the substance over a short period of time.

In 1984, the release of methyl isocyanate from a chemical plant in Bhopal, India, killed more than 2000 people.

 

Risk of asphyxiation in wine cellars


One of the industrial sectors where environmental gas pollution can be detected is in the many wine cellars in Italy.

In the environments of this sector, it is possible for gases such as carbon dioxide, nitrogen and argon to be released and the related risk of asphyxia to occur. Asphyxiation appears to be the leading cause of death in this type of confined space accident.

In particular, the risk of asphyxiation in cellars "is determined by oxygen deficiency (anoxic anoxia), a condition that occurs when oxygen is less than 21% by consumption in the same environment.

Oxygen consumption can occur while carrying out activities in confined spaces in the absence of adequate indoor air renewal.

 

How can you protect yourself?


In gas and vapour protection, the nominal protection factor is given by the type of mask (half mask or full mask) combined with the filter used.

To date, the toxic gases recognised as such under RD No. 147/1927 are as follows:

  1. Hydrogen cyanide
  2. Ammonia
  3. Sulphur dioxide
  4. Petrol containing organometallic compounds
  5. Cyanides of: potassium, sodium, calcium, barium, silver, cadmium, copper and zinc
  6. Chlorine
  7. Chloropicrin
  8. Cyanogen: bromide and chloride
  9. Cyano-carbon ether
  10. Phosgene
  11. Isonitriles
  12. Ethylene Oxide
  13. Tetraethyl lead
  14. Carbon disulphide
  15. Hydrogen phosphorus
  16. Methyl bromide
  17. Tetramethyl lead
  18. Methyl sulphate
  19. Methyl chloride
  20. Hydrofluoric acid
  21. Boron trifluoride
  22. Methylmercaptan
  23. Tetrahydrothiophene
  24. Dimethylsulphide
  25. Ethylisopropylsulphide
  26. Ethylmercaptan
  27. Diethylsulphide

To select the right protection, it is necessary to know the chemical nature of the pollutant by ensuring that the oxygen level is above 17%.

For more information on the nominal protection factor (FPN) and the PPE selection read the last paragraph of our article on Health Risks of Welding: PPE selection.

The European Standard EN 14387:2004+A1:2008 defines protection against gases and vapours according to the following table:

 

 

Every protection has its own colour: which is yours?

 

 

The products that BLS offers you to protect your health from toxic gases and vapours are half masks and full face masks with a wide range of models that vary in terms of type of connection, materials and method of use.

Choose the one that is right for you. 

Single-filter products are associated with the BLS 400 universal connection filter series. Bi-filter products are associated with the BLS 200 filter series with b-lock connection, the bayonet connection made by BLS.

 

Stay informed, stay safe.

 

Gerelateerde artikelen

februari 10, 2022 Kampioenen in veiligheid | Yamaha Motor Racing Partnerschap

BLS Group is de nieuwe officiële partner van Yamaha Motor Racing Yamaha team kiest BLS maskers om rijders en personeel te beschermen We zijn trots om onze samenwerking met Yamaha Factory Racing aan te kondigen en om de MotoGP wereldkampioenen en het hele team te beschermen. BLS & Yamaha Motor Racing - [...]

Link
november 14, 2023 Werknemerservaring: Veiligheid

L’importanza dell’employee experience sul tema della sicurezza sul lavoro. Come BLS garantisce la protezione dei lavoratori con i propri prodotti, permettendo alle aziende di rispondere al top trend 2024 del mondo del lavoro.   Nel contesto dei trend HR 2024, l’employee experience (esperienza dei dipendenti) risulta ai primissimi posti. Le aziende comprendono che oggi l'esperienza del […]

Link
oktober 23, 2023 A+A 2023 beursopening

BLS è alla fiera A+A 2023 Düsseldorf  (Germania), 24-27 ottobre 2023 A+A è l'evento più grande e importante al mondo quando si parla di sicurezza, protezione e salute sul lavoro, che quest'anno si svolgerà a Düsseldorf (Germania) dal 24 al 27 ottobre tutti i giorni dalle 09:00 alle 18:00.   Fondato nel 1954, questo prestigioso evento si è […]

Link
Abonneer op onze nieuwsbrief
Ricevi aggiornamenti sui nostri eventi, le novità in catalogo e le prossime iniziative.
Abonneren

Neem contact op

Scrivici per ogni tua esigenza, ti risponderemo entro 48 ore.
Richiedi informazioni

BLS S.R.L.
Eenpersoonsbedrijf
via dei Giovi, 41 - 20032 Cormano (MI) - Italië
t/f +39 02 39310212 / 66200473
info@blsgroup.it
Privacybeleid - Cookiebeleid

Geregistreerd kantoor
via dei Giovi, 41 - 20032 Cormano (MI) - Italië
Aandelenkapitaal: 600.000,00 euro i.v.
C.C.I.A. - R.E.A.: MI 1186898
BTW-nr.: IT12296780153
C.F. e Iscrizione al Registro delle Imprese di Milano: 07822320151

BLS IERLAND / Av. Pau Casals, 8 08182 Sant Feliu de Codines Barcelona - Spanje
BLS NOORDWEST / Reeweg, 132 3343 AP H.I. Ambacht Rotterdam - Nederland
BLS DO BRASIL / Rua Alvarenga Peixoto, 307 05095-010 Sao Paulo - SP - Brazil
BLS DUITSLAND / Steindeich 1a, 25377 Kollmar - Duitsland
BLS FRANKRIJK / 18 Porte du Grand Lyon 01700 Neyron - Frankrijk

kruismenuchevron-donskruiscirkel
NL