CGA-580 Adapter for Helium with QD Nipple

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CGA-580 Adapter for Helium ( and other inert gases) with quick-disconnect nipple that mates with our booster and transfill deluxe hose kits.

CGA-580 Adapter for Helium with QD Nipple

CGA-580 Adapter for Helium with QD Nipple
CGA-580 Adapter for Helium with QD Nipple CGA580 Fitting Side View
  • This adapter fits CGA580 connectors found on Helium, Argon and other inert gas cylinders.

This adapter fits CGA580 connectors found on Helium, Argon and other inert gas cylinders.

Our booster and transfill deluxe hose kits already include one of these, but if you are a blender who wants to maximize your supply and minimize fill times then you are cascade filling using several supply cylinders. Having an additional fitting with a quick disconnect on each supply cylinder makes cascading easier by enabling the rapid movement of the supply side hose from one bottle to the next in your cascade.

More Information
Brand DGX
SKU DX-701500-HE
Weight 2.000000

Helium Grades for Breathing Gases in Diving

Helium is obtained from the ground during the production of natural gas. Some natural gas fields are rich in helium from millions of years of natural radioactive alpha decay of uranium and thorium in the surrounding granite rock. Companies that extract natural gas in those areas remove the helium as a byproduct. There are variety of grades of compressed helium gas widely sold in returnable supply cylinders with the CGA-580 connector inert gas valve. Helium refined from natural gas using modern methods is normally transported cryogenically as a liquid, and used to produce what is generically referred to as five nines or N5.0 helium gas with 99.999% purity.

Highly refined grades of helium differ in the nature of their impurities, which in turn affects their suitability for specific applications. Different gas suppliers describe highly refined helium using different product names, but some common examples are Ultra High Purity (UHP), Semiconductor, and Laser grade. A few gas suppliers offer grades of helium that are specifically described as suitable for breathing gas mixture applications using names such as Grade-A or Diving Grade. Because there are no standards for product grades, you should examine the supplier specifications for the maximum contaminant levels among their different helium products. Based on the IANTD specification for oxygen compatible air, the helium (He) product must contain no more than 2 parts-per-million (ppm) for carbon monoxide (CO) and no more than 25 ppm total hydrocarbons (THC.) Trace contamination with other inert gases, oxygen, carbon dioxide, or water vapor will be of no concern; but there should be no hydrogen sulfide (H2S) gas.

For diving applications we recommend avoiding helium grades where the contaminants are not specified; sometimes described as Balloon, Industrial, Medical, USP, or Zero (99.0%) grade. Diving physics tells us that any contaminants in mixed gases will have their partial pressures amplified by the absolute pressure when breathed at depth. This means as depth increases thus any unknown contaminants also become an increasing concern. From the early days of technical diving there are anecdotal stories of using contaminated helium to blend trimix that resulted in the onset of bizarre temporary symptoms at depth such as loss of visual acuity and intense skin sensations. The good news is because of modern production and transport logistics for liquid helium, the highly refined grades of helium gas are typically competitively priced relative to other grades.

See also How do the grades of compressed oxygen differ?

Is there a shortage of helium? Not really, large untapped reserves of helium are believed to exist. Although, like natural gas itself, commercial helium gas is generally considered a non-renewable resource. Availability of refined helium is an indirect function of energy demand for natural gas plus demand from medical and semiconductor applications, so helium supply fluctuates with both demand for natural gas and demand for helium itself. The supply and demand fluctuations occasionally cause brief shortages; most recently in the summer of 2019. High asking prices are often blamed on the "helium shortage" but the price is usually very negotiable so it can be worthwhile to shop around between local compressed gas vendors. In our experience, technical divers can get all the helium needed when willing to pay the asking price.

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