New Jersey Scuba Diving

Mohawk (older)

Shipwreck SS Mohawk
Not to be confused with the other S.S. Mohawk or the R.C. Mohawk.
Type:
liner, Clyde Line, USA
Name:
A tribe of Iroquoian Indians of the eastern New York area.
Built:
1908, Cramp Shipbuilding, Philadelphia PA USA
Specs:
( 367 x 48 ft ) 4623 tons, 290 passengers & crew
Sunk:
Thursday January 1, 1925
burned in a storm - no casualties
GPS:
40°25.025' -73°45.158' (AWOIS)
Depth:
25 ft
AGWI Lines Pennant

This Mohawk caught fire and burned in Delaware Bay. The burned-out shell of the vessel was demolished after sinking. Today she lies in 25 ft of water some 17 miles from Lewes, a flattened mass of wreckage covering an area some 60 ft by 300 ft in a northwest-southeast direction.

This is a tough wreck to dive on. The current can be very strong when the tide is running, so it is best to dive at slack tide. Visibility is also dependent on the tide, better visibility just at the end of an incoming tide. The strewn metal gives good cover for a variety of fish, hence her popularity with the fishing boats. Many boaters have severely damaged their vessels due to the twisted wreckage.

Shipwreck SS Mohawk New York Times
Shipwreck SS Mohawk
S.S. Mohawk Clyde Line Steamer by Night. Jacksonville, FLA. 1918

This ship's replacement, also named Mohawk, is sunk off Manasquan NJ. The Clyde Line also owned the Delaware.

Cape May Dive Sites, Dive Sites, Liners, New Jersey Dive Sites,

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Air Fills

The proper way to fill a scuba cylinder is very slowly so that the heat generated by the filling process can be bled away as it happens, and the tank does not become overheated. That's a great theory, but in real life, nobody does it that way. Most tanks are "hot-filled", that is to say, that they are filled too fast to prevent them from heating up during the process. If they are filled directly off a compressor, then they will receive a very hot fill. You would be surprised how warm the surface of a tank can get. This is not much of a safety issue, though, as it is well within the thermal limits of the material, either aluminum or steel.

The real issue here is that eventually ( after a few hours ) the tank will cool down, and as it does, the air inside will contract, and the pressure will drop. This typically results in about a 10% loss of pressure. At this point, you could top it off to the rated pressure again and have a truly full tank. Most of the time that's not an option. Therefore, if the shop hot-fills your tank to 3000, you will end up with 2700. To get 3000, you need to fill the tank to about 3300. While this is verboten, it is well within the 5/3 overpressure of the hydro test, and realistically there is no danger. The slight overpressure may wear out your o-rings a little faster, but o-rings are cheap - get a dozen of them at the hardware store for a buck.

More: Air Fills ...

Disclaimer:

I make no claim as to the accuracy, validity, or appropriateness of any information found in this website. I will not be responsible for the consequences of any action that is based upon information found here. Scuba diving is an adventure sport, and as always, you alone are responsible for your own safety and well being.

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