All cutting operations should be conducted using DC (-Ve) polarity. In addition, there must be a positive operatingdisconnecting switch (also referred to as a knife switch) in the circuit. We recommend our product 400-amp duelpole, certified, isolation switch. This switch shall not be operated unless specifically directed by the diver. Whenthe divers calls for a change the tender must confirm that change to the diver. A procedure shall be developed to check the integrity of the electrical circuit before commencing any cutting operations.
Underwater cutting operations use oxygen, therefore, all safety precautions concerning the use of oxygen mustbe observed. Oxygen itself is not flammable, however, the presence of oxygen will drastically increase the speedand force with which burning takes place. For cutting in a closed compartment, pipe, tank, tubular, etc a meansmust be provided to permit the escape of all entrapped . Having the diver work from the highest point downmay reduce the possibility of trapping mixture that could lead to explosions, in any event, a means to allowun-burnt to escape must be made before cutting operations begin. When cutting a vent hole the followingfactors should be considered.
a) if there is a pressure dfferential between the inside of the enclosed space and the surrounding water there canbe a danger of pressure release, or sunction
b) if the presence of flammable is suspected before cutting operations start, the cutting of a vent hole shouldbe made using cold cutting methods.
Cylinder should be stored upright in a well ventilated area, whether full or empty and away from sources ofheat and ignition. Never store other products in a cylinder store, or have them nearby, particularly oils, paintsand corrosive liquids. Always open cylinder valves and with care, using the correct spindle key and ensure theregulator is fully wound out to ensure damage is prevented to the gauge, otherwise the sudden inrush of pressurefrom the gas cylinder may permanently damage the regulator. Never allow oil, grease or other petroleum basedsubstances to come in contact with cylinder valves, regulators, hoses or any other part of the oxygen supply system. Ensure the pressure gauge is suitable for the total pressure within the cylinder. Pressure regulators forgas cutting are of the multi- stage type. Always treat a pressure regulator as a precision instrument. Check that theregulator offers a suitable working pressure for the cylinder pressure, also check the bullnose seating for damage.
Cutting operations produce extreme localized heat and molten material Never attempt to cut without the properfilter lens to protect eyes. Skin should also be protected from heat and molten material. Always wear suitableprotective gloves.
