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Diving helmet

Types

Historically, deep sea diving helmets ranged from the two bolt to four bolt helmets; helmets with six, eight, or 12 bolts; and Two-Three, Twelve-Four, and Twelve-Six bolt helmets.

Notable modern commercial helmets include the Kirby Morgan Superlite-17 from 1975 and developments from that model. These helmets are of the demand type, built on a fiberglass shell with chrome-plated brass fittings, and are considered the standard in modern commercial diving for most operations.

The Desco "air hat" is a metal free-flow helmet, designed in 1968 and still in production. Although it has been updated several times, the basic design has remained constant and all upgrades can be retrofitted to older helmets. Its robust and simple design (it can be completely disassembled in the field with only a screwdriver and wrench) makes it popular for shallow-water operations and hazardous materials diving. The Desco is secured to the diver by means of a "jock strap" which runs between the legs, and its buoyancy can be fine-tuned by adjusting intake and exhaust valves.

Light-weight transparent dome type helmets have also been used. For example the Sea Trek surface supplied system, developed in 1998 by Sub Sea Systems, is used for recreational diving.. Also the Lama, developed by Yves Le Masson in the 1970s, has been used in television to let viewers see the face and hear the voice of the presenter speaking underwater.

History

See Diving helmets appear for the history of the diving helmet.

Augustus Siebe is known as the father of Diving. In the year 1837 German-born inventor Augustus Siebe, then living in England, developed a Diving Helmet which was sealed to a watertight, air-containing rubber suit. The closed diving suit, connected to an air pump on the surface, becomes the first effective standard diving dress, and the prototype of hard-hat rigs still in use today. In his obituary Siebe is described as the father of diving.

Siebe Gorman & Co was notable for developing the losed diving helmet of the standard diving dress and associated equipment. As the helmet was sealed to the diving suit, it was watertight, unlike the previous pen helmet systems. The new equipment was safer and more efficient and revolutionised underwater work from the 1830s.

However, Alexander McKee proposed that brothers John and Charles Deane were the true inventors, and that Siebe was the leading manufacturer of their designs.

Commercial diver Joe Savoie is credited with inventing the neck dam in the 1960's, which made possible a new era of lightweight helmets including the Superlite series. Savoie chose not to patent his invention because of his desire to improve diver safety.

Nowadays

An alternative to the diving helmet that allows communication with the surface is the full face diving mask. These cover the diver's face and are held onto his head by adjustable straps.

"Diving helmet" sometimes means a hard safety helmet like a workman's helmet that covers the top and back of the head, but is not sealed. These may be worn with a full-face mask to provide impact protection.

During the First World War the British Army used a few diving helmets out of water as emergency protection from mustard gas.

See also

Standard diving dress

Three bolt equipment

References

^ Curley, MD (1986). "Human Factors Evaluation of the Superlite 37B Helmet in the Surface- Supplied, Open-Circuit Mode". US Navy Experimental Diving Unit Technical Report NEDU-11-85. http://archive.rubicon-foundation.org/3527. Retrieved 2008-09-09. 

^ Kirby Morgan DSI dive helmets

^ Sea Trek dive helmet

^ Lama dive helment

^ The Infernal Diver by John Bevan, Hardcover - 314 pages (27 May, 1996), Submex Ltd; ISBN 0-9508242-1-6

External links

Modern helmet photo collection

U.S. Navy Mark V Diving Helmet

Diving helmets collection of Diving Heritage museum

Siebe Gorman - The father of Diving

St Maarten Helmet Dive photo collection

Categories: Underwater work | Diving equipment | HelmetsHidden categories: Articles needing cleanup from November 2009 | All pages needing cleanup
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Does "Gasket Maker" actually make gaskets, eliminating the need to use real ones?

I need to replace my valve cover gasket because its leaking oil, and I have some of the high temp gasket maker (in the red tube).

I'm wondering though, is this merely a gasket dressing, or does it actually "make" a gasket, eliminating the need to buy a $30 gasket from the part store?

It dries to make a rubbery piece of the thickness you want. If you go around carefully avoiding the holes and the bolts you will have a gasket surface everywhere you need it between the two parts. It will not look like the store-bought one but it will act as a gasket.

Clean the surface you will apply it to, including getting off all of the old gasket. Apply it over the path you need in one pass. Don't skip an area and then try to go back later.

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