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as of 08/27/14

 

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DESCO HELMETS

All current production

DESCO helmets

 

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DESCO Two Diver

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as of 09/11/14

 

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DRYSUITS

Third party dry suits

sold by DESCO

 

DEEPSEA B-2 HELMET

Composite Beat Engel

Demand Helmet

 


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SAFETY

Update 11-22-12 

 

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DIVING REGULATIONS

OSHA, USCG,

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Manuals & service guides

 

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General Diving & Equipment

 Information

 

SURFACE SUPPLIED DIVING

What gear it takes to dive.

 

CONTAMINATED WATER DIVING

 

HELMET CONSTRUCTION

What goes into making

a diving helmet

 

HELMET IDENTIFICATION

Real or Replica?

 

HELMET DETAILS

Features of the various

helmet models

 


 Company

History

 

COMPANY HISTORY

How DESCO started

 

DESCO PEOPLE

Those who built DESCO

 

DESCO PRODUCT HISTORY

General product history. Catalogs, significant orders, etc.

 

OLD EQUIPMENT

Discontinued DESCO Products

 

MIXED GAS & REBREATHERS

DESCO A, B, C Rebreathers Recirculating Helmets 

 

DESCO SPORTING GOODS

SCUBA Lungs, Water Skis, and Miscellaneous Water Sports Products

 


Galleries

 

MEDIA

Magazine or News

articles related to diving.

Links to online diving videos.

 

GALLERY 1

DESCO company photos

and photos from our archives

 

GALLERY 2

Commercial Diving Photos supplied by customers

 

GALLERY 3

Classic equipment &

hobby diving photos

 

GALLERY 4

Photos of helmets from

other manufacturers

 

GALLERY 5

Photos of equipment

 in museums

 

GALLERY 6

Photos from some of

our repair projects

 

GALLERY 7

DESCO Historical Item Collection

 

GALLERY 8

Miscellaneous Photos,

Old diver and/or equipment photos

 

 

 

 

Surface Supplied Diving

On this page we will provide information on the methods, equipment, and history of surface supplied diving.

 


 

Surface supplied diving as opposed to SCUBA uses a air compressor and hose to deliver breathing gas to the diver. This type of diving is more complicated than SCUBA in that the diver requires a tender to operate and monitor the compressor and umbilical lines. While surface supplied diving does restrict freedom of movement (particularly vertically in the water column) the advantages are full communications capability with the surface, and duration only limited by the diver's endurance.  It is superior in contaminated water as the diver remains completely dry, and with a free flow system is unlikely to get back flow through the exhaust valve. The heavy weight of the diving outfit which is a impediment on the surface, becomes an asset when working underwater on fixed objects. Where a diver in SCUBA remains near neutrally buoyant a heavy gear diver can virtually anchor him/her self to the bottom. This allows for more natural use of tools as leverage can be applied easily.

 

Setting up and dressing in a heavy gear diver is a complex process. Below are some interesting videos on You Tube:
 

Deep Sea Diving: "The Diving Dress" pt1-3 1943 US Navy http://www.youtube.com/watch?v=vsMNENXOues

Deep Sea Diving: "The Diving Dress" pt2-3 1943 US Navy http://www.youtube.com/watch?v=xFm2jwlCFFg

Deep Sea Diving: "The Diving Dress" pt3-3 1943 US Navy http://www.youtube.com/watch?v=XhaEZmWoAHU

Deep Sea Diving: Assembling the Deep Sea Suit pt1-2 1963 US Navy  http://www.youtube.com/watch?v=yp0JLRnA1mA

Deep Sea Diving: Assembling the Deep Sea Suit pt2-2 1963 US Navy http://www.youtube.com/watch?v=5s0CeqeT60I

 

Surface Supplied Diving Equipment

 

In surface supply the helmet gets all the glory. Collectors worldwide have made the US Navy Mark V Diving Helmet an icon. The Mark V helmet is probably the most collected and widely available diving helmet. No serious collection would be without at least one Mark V.

A diving helmet is useless though without all of the other gear that makes up an "outfit".

 

Excerpted from the 1959 USN Diving Manual

 

 



Page from late 1940's DESCO Catalog

 

First for a diver to survive he needs AIR which is supplied by a compressor through a hose. If more than one diver is working valves and fittings are needed to adapt to the situation.

   

 

 

The diver needs an environment where he can function and this is provided by the helmet and dress. In cold water extra protection is needed. Thermal underwear become a necessity. The sleeves of the dress can be sealed by rubber cuffs or by clamps which attach waterproof gloves or mittens to them. The helmet is heavy and a helmet cushion protects the diver's shoulders on the surface.

     

 

 

   

 

  

The dress and helmet displace water so to achieve and maintain depth the diver needs ballast in the form of weight on his belt and shoes. Weightbelts and shoes come in either light or heavy models depending on what type of helmet or dress are used. The size of the diver also contributes to the need for weight.

 

A properly equipped diver never goes into the water without his knife. Where conditions warrant a diver may take a light with him, either battery powered or powered from the surface.

       

 

 

For safety and efficiency the diver and surface must be able to communicate. A diver's telephone connects to the helmet and allows the tender to monitor the diver. In a two wire system the tender operates a switch on the telephone when he wishes to talk to the diver. The tender also controls talk between divers.

 

Getting the diver into and out of the water is done by ladder or by using a lifting stage.

           

 

For emergencies a decompression chamber is needed to treat the "Bends". The "Bends", called that from a sufferer's natural inclination to bend over from the pain, is nitrogen gas which has been saturated in tissues in the body is released too fast, creating bubbles in the blood and joints. The nitrogen is from common air which under pressure dissolves into muscle and tissue. Experimentation found that Helium will absorb and disperse much faster than nitrogen in the body and has become a substitute in divers breathing mixture for nitrogen on deep dives.

The Bends can afflict surface supply divers and SCUBA divers alike. Other workers too can suffer from them. The common name for the Bends is Caisson Disease. It comes from deep tunnel workers suffering from the Bends after coming to the surface when their shifts ended. Caisson's are built at the top of the tunnel so it can be pressurized to prevent flooding. Early hyperbaric research focused on tunnel miners, not divers. Major turn of the century (19th - 20th) underground construction projects like railroad tunnels under rivers, bridge piers, subways, aqueducts, and water intakes all had cause to worry about the Bends.

       

 

The Bends are treated by placing the sufferer back under pressure and slowly allowing the nitrogen to dissipate via decompression. This is achieved using a chamber, or by taking the diver back underwater then returning to the surface in stages.

 

An assortment of tools, spare parts, and materials.

   

        

 


     

 

     

 


 

 

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