What's the difference between bulkhead and cofferdam?

Bulkhead


Definition:

  • (n.) A partition in a vessel, to separate apartments on the same deck.
  • (n.) A structure of wood or stone, to resist the pressure of earth or water; a partition wall or structure, as in a mine; the limiting wall along a water front.

Example Sentences:

  • (1) Previous studies have demonstrated leaching from chromated-copper-arsenate (CCA)-treated wood, which is used in pilings and bulkheads, and resulting toxicity to various estuarine organisms.
  • (2) US Navy naval architects devised a plan where the superstructure was stripped as far as possible to lighten the ship then watertight bulkheads were fitted internally to form buoyancy chambers.
  • (3) The cabin and bulkheads of Plastiki have also been constructed out of a special recycled material called srPET, made of webs of plastic.
  • (4) The effects of chromated copper arsenate (CCA), used for treating wood in docks, pilings, and bulkheads, were studied in several estuarine organisms.

Cofferdam


Definition:

  • (n.) A water-tight inclosure, as of piles packed with clay, from which the water is pumped to expose the bottom (of a river, etc.) and permit the laying of foundations, building of piers, etc.

Example Sentences:

  • (1) In early May, the cofferdam failed due to a build up of crystallised gas , and as the oil began to wash ashore, BP focused instead on trying to capture some of the leaking oil, rather than stopping the flow all at once.
  • (2) Deepwater team attempts to put 100-tonne box over blown-out oil well Video recreation of cofferdam method A fishing ban for federal waters off the Gulf is extended to 17 May.
  • (3) 30 patients who had experienced contact urticaria after exposure to gloves, contraceptives, balloons or dental cofferdams went through a detailed examination including interviews on: exposure to rubber; local and distant symptoms; provocation tests; skin prick tests with (among other substances) latex extracts from the rubber tree Hevea brasiliensis; patch testing, IgE and RAST analyses.
  • (4) While beginning this drilling, the company successfully stemmed one of the three leaks by attaching a valve to the end of the crippled drilling pipe, and after constructing three huge cofferdams – or containment domes – tried to lower one over the main source of the leak.

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