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Maintenance

Why have a plan?

  • Safety of operation, general
  • Safe use of high pressure filling equipment, in particular
  • Customer service
  • Uptime and efficient operation
  • Protect capital investment

What does the plan do?

  • Manages activity
  • Monitors station performance
  • Provides emergency fueling support
  • Improves equipment reliability
  • Delivers clean fuel to vehicles

When do you perform maintenance?

  • Proactive
  • Scheduled
  • Reactive/emergency

How do you do maintenance?

  • Documented on operation and maintenance forms.
  • Detailed – date, time, weather conditions, temperature, list of items to be checked, recorded, drained, or added.

Commonly overlooked items

  1. Removal of hazardous materials – dryer desiccant, liquid from dryer regeneration, filter cartridges, compressor lubricants.  OSHA fines.
  2. Improper compressor readings (suction, interstage, discharge) pressures & temperatures
  3. Not draining coalescing filters and ASME cylinders:  compare oil added to compressor to oil drained from filters and cylinders.  The difference is oil carryover into vehicles. 
  4. Not re-certifying safety relief valves at dryer, compressor, cylinders, and dispenser to NFPA 52 (3 yrs; CA: 1 yr)
  5. Testing the methane detector inside the compressor enclosure

See also:  National Fire Protection Association (NFPA) http://www.nfpa.org/index.asp

NGVi’s Oil Carryover Technical Paper: The Achilles Heel of Natural Gas Vehicles: The Symptoms, Diagnosis and Prevention of Oil Carryover


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