dive gearCompressors – Sales and Servicing

Hobby diver, professional diver, diving club, or the owner of a Dive Shop – If you buy a compressor from the Dive Doctor you are choosing uncompromising quality and absolute safety for your breathing air supply.

We are a market leader with over 25 years of experience in breathing air compressors and systems throughout New Zealand and the Pacific Islands. We also supply the NZ Navy, Police, DOC, NIWA, Customs, Universities, Dive shops and private individuals.

The Dive Doctor offers a full range of compressors by leading manufacturers including Alkin®, Bauer® and Coltri-Sub® and high pressure parts by Midland Diving® and Lawrence Factor®.

At the Dive Doctor we have a full service workshop with engineers that have been repairing compressors for over 25 years. The Dive Doctor specialises in the maintenance and repair of all brands of breathing air compressors. We stock a full range of spare parts and can ship worldwide with a very quick turnaround.

The quality of your breathing air is directly related to your filtration and we have a large stock of prepacked filters, activated carbon, molecular sieve, filter pads of various size and Hopcalite/Monoxycon and Anderol® synthetic compressor lubricants. We provide an air quality testing service to AS/NZ 2299.1 and AS3848.2

Another area of expertise is Hydrostatic (hydro) test panels for testing of cylinders and booster pumps. We have factory trained service technicians for servicing Haskel® & Hydraulics International® pumps with quick turn around and loan pumps available.

The Dive Doctor is your one stop shop for all your high pressure equipment.

When is bad breathing air dangerous?

“My breathing air is pure!” is what you want to be able to say before your next dive. Diving into the shimmering underwater world must not be allowed to endanger one thing in particular: your health. The greatest danger lurks in bad breathing air. Excessive water contained in breathing air can cause serious material damage to dive cylinders, as they can start corroding from the inside. Moreover there is the risk that the breathing regulator will ice up during a dive. Impurities due to oil residues (aerosols) are also not to be taken lightly. Among the more harmless consequences is a headache. Extreme caution is to be observed if there is an oily aftertaste. This indicates residual oil content considerably over the safety limit and is hazardous to health: These oil residues can form a permanent deposit in your lungs, damaging the pulmonary alveoli.

When can it be life-threatening to you?

Carbon dioxide (CO²) is a natural component of our breathing air. However, it also applies here that high concentrations of CO² are dangerous. Headaches are normally the first warning sign. If the CO² concentration is greatly increased, you risk an accelerated pulse, rise in blood pressure and shortness of breath. The latter is caused by hyperventilating: Breathing is accelerated and panic arises. As a result, there is the danger of unconsciousness and in extreme cases, death. Of much greater danger is carbon monoxide (CO) which is a colourless, odourless and tasteless toxic gas. It is generated during an incomplete oxidation of carbonaceous substances. This occurs, for example, during combustion of fuels in the petrol or diesel engine of a compressor as well as in car exhausts. Inhalation of excessive carbon monoxide causes nausea, tinnitus, unconsciousness and an impairment of the heart function as oxygen uptake in the blood is blocked. Even small concentrations of carbon monoxide in the breathing air suffice for chronic damage to heart and nerves. Prolonged inhalation of increased doses of CO is lethal.

How is polluted breathing air generated?

A centre owner with a sense of responsibility and competence knows the causes for the generation of polluted breathing air and is therefore able to exclude the risks.

Where are the greatest dangers lurking during cylinder filling?

Cartridges supplied by other parties and not matched to the purification system and cartridges not being exchanged in due time are unable to absorb either all or some of the pollutants. During the self-filling of cartridges, wrong filter materials are used, or the materials are layered in the wrong order or in wrong proportions. This can also arise from improper storage where the drying agent is already in saturated form before being used. Wrong conditions within the compressor room (e.g. overheating) may result in the breathing air, which is being filled into the cylinders, being polluted due to over-saturation of the filter cartridge. For guaranteeing perfect breathing air it is indispensable that the filter cartridge is exchanged on time and not at discretion.

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