Used Gas Handling & Controls for Sale

It's the parts that take gas from a cylinder, tank or pipeline and deliver it at a controlled pressure and flow: regulators, manifolds, valves, hoses and gauges. Regulators reduce supply pressure to the pressure you use. Manifolds connect several supply cylinders and must include approved pressure regulators.

Sources: ANSI — CGA E-4 scope · OSHA 1910.253

It depends on the manufacturer, so contact them before changing service. OSHA says pressure-reducing regulators may only be used for the gas and pressures they were built for, and regulator makers advise checking with them on gas properties.

Sources: OSHA 1910.253 · Harris — regulator life expectancy

Confirm the pressure and gas ratings match your application. Check for external leaks, and for internal leakage ("creep"), where a dirty or damaged seat lets outlet pressure keep rising. One maker recommends pulling regulators for inspection at least every five years. Inspection or rebuilding should go to the manufacturer, its authorized agent, or a properly trained mechanic.

Sources: Harris — regulator life expectancy · OSHA 1910.253

Oxygen doesn't burn, but it makes other materials burn much faster, so contamination in the gas path is a fire risk. OSHA requires regulators, hoses and fittings to be kept free of oil and grease, and CGA G-4.1 and ASTM G93 set out how to clean, inspect and package parts for oxygen service. Without cleaning documentation, treat a part as not oxygen-clean.

Sources: ANSI — CGA G-4.1 overview · OSHA 1910.253 · AMF — CGA G-4.1 vs ASTM G93

CGA G-4.1 covers planning, precleaning, cleaning, rinsing and drying, inspection, contamination limits, packaging and labeling. Methods include mechanical, aqueous, solvent and semi-aqueous cleaning. It applies where oxygen concentration is above 23.5%, and cleaned parts must be packaged to stay clean until installed.

Sources: CGA — G-4.1 · ANSI — CGA G-4.1 overview

Ask for the nameplate or body markings showing the model and pressure rating; CGA E-4 requires regulators to carry markings and information. For manifolds, OSHA requires each station outlet to be marked with the gas name. Where the service needs it, ask for the oxygen-cleaning record and packaging.

Sources: ANSI — CGA E-4 scope · OSHA 1910.253 · CGA — G-4.1

In industrial plants, it's usually ASME B31.3 Process Piping. It covers gas, air, refrigerant and cryogenic piping, including hydrogen and cryogenic plants, and sets rules for materials, design, fabrication, examination and testing, including piping inside packaged skids.

Source: ASME — B31.3