CNG Gas Dryer - STCNG24-VZ1 Natural Gas Dryers, inlet 150 psi, flow 200-500 scfm

What pressure, flow and temperature is it rated for?

This unit is rated for 150 PSI MAWP at 500°F with a flow capacity of 200-500 SCFM. The minimum design metal temperature is -20°F at 150 PSI. The inlet pressure listed is 150 PSI, which matches the MAWP, so confirm with the seller whether the unit requires full inlet pressure to operate or if it can function at lower pressures within that range.

What gases is it compatible with, and has it been oxygen cleaned?

This unit was manufactured for natural gas service and holds CRN registration D1209.6, which is specific to natural gas applications. The listing does not indicate oxygen cleaning or compatibility with other gases. Natural gas dryers use desiccant beds that can retain hydrocarbons, so switching to oxygen service would require complete media replacement, thorough cleaning, and re-certification — ask the seller about service history if you're considering other applications.

What should I inspect before putting it into service?

Inspect the desiccant beds for contamination, caking, or degradation — after 24 years, replacement is likely necessary regardless of apparent condition. Check all vessel welds, inlet/outlet connections, and the regeneration heater circuit (480V) for corrosion or damage, and verify that the Autodew control system powers up and cycles properly. Confirm the CRN registration is current for your jurisdiction and that the unit has pressure relief devices with valid inspection dates; most jurisdictions require periodic re-inspection of pressure vessels depending on local codes.