About: Diving helmet

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A diving helmet is a rigid head enclosure with a breathing gas supply used in underwater diving. They are worn mainly by professional divers engaged in surface-supplied diving, though some models can be used with scuba equipment. The upper part of the helmet, known colloquially as the hat or bonnet, may be sealed directly to the diver using a neck dam, connected to a diving suit by a lower part, known as a breastplate, or corselet, depending on regional language preferences. or simply rest on the diver's shoulders, with an open bottom, for shallow water use.

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  • A diving helmet is a rigid head enclosure with a breathing gas supply used in underwater diving. They are worn mainly by professional divers engaged in surface-supplied diving, though some models can be used with scuba equipment. The upper part of the helmet, known colloquially as the hat or bonnet, may be sealed directly to the diver using a neck dam, connected to a diving suit by a lower part, known as a breastplate, or corselet, depending on regional language preferences. or simply rest on the diver's shoulders, with an open bottom, for shallow water use. The helmet isolates the diver's head from the water, allows the diver to see clearly underwater, provides the diver with breathing gas, protects the diver's head when doing heavy or dangerous work, and usually provides voice communications with the surface (and possibly other divers). If a helmeted diver becomes unconscious but is still breathing, most helmets will remain in place and continue to deliver breathing gas until the diver can be rescued. In contrast, the scuba regulator typically used by recreational divers must be held in the mouth by bite grips, and it can fall out of an unconscious diver's mouth and result in drowning. Before the invention of the demand regulator, all diving helmets used a free-flow design. Gas was delivered at an approximately constant rate, independent of the diver's breathing, and flowed out through an exhaust valve against a slight over-pressure. Most modern helmets incorporate a demand valve so the helmet only delivers breathing gas when the diver inhales. Free-flow helmets use much larger quantities of gas than demand helmets, which can cause logistical difficulties and is very expensive when special breathing gases (such as heliox) are used. They also produce a constant noise inside the helmet, which can cause communication difficulties. Free-flow helmets are still preferred for some applications of hazardous materials diving, because their positive-pressure nature can prevent the ingress of hazardous material in case the integrity of the suit or helmet is compromised. They also remain relatively common in shallow-water air diving, where gas consumption is of little concern, and in nuclear diving because they must be disposed of after some period of use due to irradiation; free-flow helmets are significantly less expensive to purchase and maintain than demand types. Most modern helmet designs are sealed to the diver's skin at the neck using a neoprene or latex "neck dam" which is independent of the suit, allowing the diver a choice of suits depending on the dive conditions. When divers must work in contaminated environments such as sewage or dangerous chemicals, the helmet (usually of the free-flow type or using a series exhaust valve system) is directly sealed to a dry suit made of a fabric with a smooth vulcanised rubber outer coating to completely isolate and protect the diver. This equipment is the modern equivalent of the historic "standard diving dress". (en)
  • 다이빙 헬멧은 가 착용하는 헬멧을 말한다. 미국 해군의 와 한국 해군의 SSU 등 수중에서 작업을 하는 잠수사들은 다이빙 헬멧을 착용해 으로 산소를 공급받으면서 장시간 수중에서 작업한다. (ko)
  • Een duikhelm werd vroeger gebruikt door duikers, die met een koperen duikhelm, twill duikpak, zware lompe loden schoenen, een dito borst/ruggewicht of een gordellood om, vanaf een schip afdaalden. Hun helm was verbonden met een luchtslang, die om veiligheidsredenen werd vastgezet aan de helm. De duiker had om dezelfde reden een touw om zijn middel. Een duikhelm was van koper en had drie of soms vier glazen kijkvensters. Het voorste venster kon geopend worden. Links, rechts en soms schuin bovenaan, was er ook een venster voor een groter perifeer zicht. De duikhelm kon vanwege zijn gewicht niet door de duiker zelf op de halsschouderplaat geschroefd worden, dit gebeurde door helpers. Tijdens het onderwatergaan stroomden de helm en het duikpak vol lucht via de toevoer van de luchtpomp op het schip of aan de oever. Om onder water te kunnen gaan waren de loden gewichten noodzakelijk. In het geval dat de duiker onder water in een gevaarlijke situatie terechtkwam, kon hij door het verwijderen van de loden gewichten snel naar de oppervlakte.Echter door het drukverschil hiermee , kon het de gevreesde caissonziekte tot gevolg hebben, soms met fatale afloop. Heden ten dage worden ook andere duikhelmen gebruikt voor werken op grotere dieptes. Deze duikhelmen zijn op stalen duikpakken bevestigd, waarvan de 'handen' grijphaken zijn. De duiker bedient deze grijphaken van binnenuit met zijn handen. Deze zware stalen pakken kunnen de druk van het water verdragen tot op 400 meter diepte, terwijl de druk in het pak dezelfde blijft als aan de oppervlakte. (nl)
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  • Copper and brass three bolt Soviet diving helmet. (en)
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  • Diving helmet (en)
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  • Provision of breathing gas, communications, underwater vision and head protection to underwater divers (en)
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  • 다이빙 헬멧은 가 착용하는 헬멧을 말한다. 미국 해군의 와 한국 해군의 SSU 등 수중에서 작업을 하는 잠수사들은 다이빙 헬멧을 착용해 으로 산소를 공급받으면서 장시간 수중에서 작업한다. (ko)
  • A diving helmet is a rigid head enclosure with a breathing gas supply used in underwater diving. They are worn mainly by professional divers engaged in surface-supplied diving, though some models can be used with scuba equipment. The upper part of the helmet, known colloquially as the hat or bonnet, may be sealed directly to the diver using a neck dam, connected to a diving suit by a lower part, known as a breastplate, or corselet, depending on regional language preferences. or simply rest on the diver's shoulders, with an open bottom, for shallow water use. (en)
  • Een duikhelm werd vroeger gebruikt door duikers, die met een koperen duikhelm, twill duikpak, zware lompe loden schoenen, een dito borst/ruggewicht of een gordellood om, vanaf een schip afdaalden. Hun helm was verbonden met een luchtslang, die om veiligheidsredenen werd vastgezet aan de helm. De duiker had om dezelfde reden een touw om zijn middel. (nl)
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  • Diving helmet (en)
  • 다이빙 헬멧 (ko)
  • Duikhelm (nl)
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