4" Dredge Instructions - Keene Engineering

Introductionto Hookah DivingThere are two air supply systemsthat are used for underwaterdiving activities. One system,known as Self ContainedUnderwater Breathing Apparatus(SCUBA), involves the use of highpressure metal tanks which areworn on the diver's back whilediving. The equipment used inSCUBA diving is quite technical innature, and SCUBA gear should notworld topside.There are many times when anunderwater diver does not need when the engine or motor thatthe total freedom that is afforded powers the compressor ceases toby the SCUBA air system, particularlyoperate. This makes for a trulyin cases in which the diver economical air system, which willbe used by persons who have not is submerged in a limited area for quickly pay for itself when comparedbecome a certified diver involvingexpensive, specialized instruction.long periods of time.For these applications, the to the cost of refilling aSCUBA tanks every hour or so.Without a certification card"Hookah" (Surface Air Supply) The only operating cost for aindicating completion of such acourse, you cannot purchase compressedwas invented. The The Hookah air Hookah system is fuel, since thesystem uses no high pressure airvast majority of Hookah compres-air.tanks of the type worn on a diver's sor units are gasoline powered.Of course, the SCUBA air systemback. Instead, it uses a small airIt is not uncommon to get twohas its advantages as well. compressor A which is located at the hours diving time on a single gal-diver using SCUBA gear is liter-surface. It is commonly poweredlon of gas, which shows just howally "an entity unto himself,"since he carries his life giving airsupply on his back at all times. Hecan go anywhere he chooses, completelyfree of any ties with theby a portable gasoline engine orelectric motor, and the air isdelivered to the diver via a floatingair hose. With the Hookahsystem, the diver has an unlimitedand nearly "cost free" air supplywhich will only stop flowing1