Specialty Gas Distribution Equipment for Western Michigan

Specialty gases are only as usable as the apparatus tasked to disperse them. The purity and precision these gases offer stand a good chance of being compromised in the absence of adequate pressure and flow control and absent the provisions to verify gas use.

Although the standard is that compressed gases, because of their nature, are best shipped in high-pressure gas cylinders, controlling that pressure in typical use is often put on the back burner. There are many distinctions between cylinder regulators created for oxy-fuel cutting and welding, general purge gas applications, and specialty gas use.

The PurityPlus® gas pressure-reducing regulators and flowmeters sold by GTW offer a level of quality in materials, design, and assembly that distinguishes them from regular industrial gas equipment. While more costly, this equipment generally provides a value that far exceeds its price. PurityPlus® regulators, for example, typically use diaphragms made of stainless steel instead of rubber. Rubber diaphragms tend to absorb moisture and impurities, then off-gas these contaminants as the cylinder supply pressure drops. This can wreak havoc in carrier gas flow and instrument response.

Equally troubling is the issue of crawl. As the pressure in a gas cylinder is made to fall, the pressure on the diaphragm is also lessened, and the outlet pressure can go higher. To compensate for this action and contain its effects, it is heartily advised that a two-stage PurityPlus® regulator be employed. The manufacturer presets the first-stage pressure reduction, typically around 300-500 psig, giving users the ability to  control the ultimate outlet pressure in the second stage. Setting an intermediate pressure dampens the crawl effect by the second stage to the point that  it’s just about non-existent until the cylinder pressure slips back below 150-200 psig.

Its worth comparing this, now, to an industrial gas single-stage regulator. As a result of the single-stage design, the single diaphragm experiences a continuous reduction in supply pressure accompanied by an unhurried but continuous increase in outlet pressure that could waver as much as 10-15 psig.

These are only a couple of examples that show clearly why the right gas also demands the right gas equipment. Contact us online or get in touch with us, GTW, at 616-754-6120. We not only have the right gases and the right equipment with the right options for you, but we also have the right answers to any question you might have about specialty gas control.