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Nitrogen Tire Inflation Membrane vs. PSA

This detailed analysis dives into the key differences between PSA and nitrogen tire inflation technologies, focusing on factors like performance, pricing, purity levels, and maintenance. Discover insights regarding carbon molecular sieve, contamination risks, fill times, and the implications of Parker Hannifin PSA features. Uncover the truth about long-term performance, serviceability, and the overall value these systems offer. Evaluate the importance of purity, pressure, and the potential deceptive practices in the market. Find out what's best for automotive applications and why customer focus and reliability should be paramount in decision-making.

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Nitrogen Tire Inflation Membrane vs. PSA

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  1. Nitrogen Tire InflationMembrane vs. PSA

  2. Parker Hannifin PSA • We make PSA units in Baltimore • Typically for high flow, high purity applications • Do not believe it meshes w/ auto market due to increased attention required

  3. PSA System Operation

  4. The Case for PSA • Touted as new technology • NOTE: It is an old technology that is well known outside Autos • Price per scfm • Fuzzy math on the flow rate • Lower price, lower quality from China • NOTE: Nearly equivalent price, or higher in USA • Air Factor • Much better at higher purities • NOTE: Relatively close at lower purities • Dewpoint • Will approach -70F vs. -40F for membranes vs. +45F for dry air • NOTE: 11ppm vs. 79 ppm vs. 6500 ppm @ atmosphere • Purity • 99.99% is possible, usually touted at 99% • NOTE: Need about 97%+ in the tank to get 95% in the tire

  5. PSA Facts – Carbon Molecular Sieve • CMS • Adsorbs oxygen under high pressure, desorbs at atmosperic pressure • Controlled by valve cycling • High grade CMS vs. low grade CMS • Has a finite life significantly hampered by contamination • Water or oil or oil vapor

  6. PSA Facts – Contamination • CMS behaves just like a carbon filter • Releases adsorbed oxygen and water vapor • Oil, water and hydrocarbon vapor attach, plug up the pores and compromise life and performance.

  7. PSA Facts – Proprietary Fill Technique • Ensures long term performance • Eliminates ratholing, channeling, dusting, etc. • Hampers long term performance & life of unit • Buffer differential pressure • Fluidization • Carbon integrity • Vessel Sizing • Gas velocity

  8. PSA Facts - Portability • If towers are not packed properly, carbon will shift as moved • As carbon shifts, ratholing, channeling and dusting will occur • Units life & performance is compromised • Very heavy and difficult to move around, especially on casters

  9. PSA Facts – Maintenance • Membrane: passive vs. PSA: active • Membrane is more trouble free • Solenoid Valves • Frequent cycling - wear • Maintenance team • Stock replacements • Controllers • Valve timing

  10. PSA Facts - Pressure • No benefit from higher pressure found in most auto shops • One mfg advertises 8 scfm equivalent membrane flow. • True flow is 6 scfm • At what purity? • 40% drop 95% - 98% • Say flow in equivalent membrane is 8 scfm

  11. PSA Fill Times – No Tank • N2 fill cycle: 8 mins • Purge time: 6 mins • Fill time: 2 mins • Without tank, no N2 produced during long purge cycle • Compare membrane vs. PSA in 10 cf tire (40 cf tot) • 5.1 scfm membrane w/ tank: • Makes N2 during purge • Cycle = 40/5.1 = 7.84 mins • 6 scfm psa, no tank • No N2 during purge • 7 mins fill time • Cycle: 7 mins + 6 mins = 13 mins

  12. Parker Hannifin PSA Features

  13. Built in China Quality? Issues? For sale? Ownership? Membrane & steel price increase What’s best for customer? Deceptive flow Deceptive price What is true price? Long term focus? Serviceability is now their responsibility Reports of other Chinese PSA providing 81% N2 Tank often an option Membranes for stationary units Couldn’t compete w/ portable PSA for Tire Inflation

  14. Take a Look Inside • This is a picture of a PSA unit designed for tire inflation • Compare w/ membrane • Too many chances for critical failures • Not making money when nitrogen is down • Is this, coupled with all of the other factors, truly worth the savings?

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