Technical Papers

Natural Gas Fueling Station Maintenance Overview and Commonly Overlooked Items

NGV Maintenance Facilities Modification Requirements

Effective CNG station maintenance can determine the success or failure of both a CNG station and the overall NGV program. However, maintenance is perhaps the most overlooked issue affecting CNG fueling stations.  In many areas, there is a severe lack of experienced and qualified maintenance and repair technicians. 


In this technical paper, NGVi outlines the why, what, who, when and how of utilizing a proactive CNG fueling station maintenance plan and some of the often overlooked maintenance issues.

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Bid Specifications for Natural Gas Vehicles

NGV Maintenance Facilities Modification Requirements

Fleet managers and their staff are experts at writing vehicle specifications for gasoline and diesel vehicles.  Natural gas vehicles (NGVs), on the other hand, are not exactly like their gasoline and diesel counterparts.  NGVs have unique characteristics that fleet managers should be aware of that will help ensure successful incorporation of NGVs into the fleet.  

In this technical paper, NGVi outlines four considerations unique to compressed natural gas (CNG) that will assist writing bid specifications for NGVs.

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Facilities Modification for Natural Gas Vehicles

NGV Maintenance Facilities Modification Requirements

Vehicle maintenance facilities where natural gas vehicles are serviced must be modified or constructed to conform to safety requirements related to the unique properties of natural gas. These modifications must meet the basic safety requirements, but do not need to be expensive. This technical paper describes the basic modifications that need to be made in order to be in compliance with the National Fire Protection Association (NFPA), the overarching organization responsible for the codes that govern NGV maintenance facilities.

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An Ounce of Prevention: The Nuts and Bolts of CNG Fuel System Inspection
CNG Fuel System Inspection Leo Thomason is the Executive Director of Natural Gas Vehicle Institute, where he applies his more than 25 years of natural gas vehicle experience to developing and serving as the lead instructor for a variety of natural gas related training courses for fleets around the world. Leo developed and is the lead instructor for NGVi’s natural gas vehicle fuel system and fuel storage cylinder inspection training course. In this Technical Paper, Leo answers the most commonly asked questions about compressed natural gas (CNG) fuel system inspections.
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Clause and Effect: What to Look For In an Effective Natural Gas Transportation Fuel Contract
Clause & Effect Choosing a third-party operator to provide natural gas fueling can be an excellent option for fleets who don’t want the responsibility of owning or maintaining fueling equipment. However, fleets who choose this option need to understand how natural gas fueling works and must articulate your needs clearly to avoid the need for costly remediation. This, of course, requires an impartial expert who understands the subtleties of what is involved in the contractual relationship between a fuel provider and a fleet operator. Omissions or vague and uncertain provisions are usually settled in favor of the party drafting an agreement. Usually that party is the one that controls the money. NGVi highlights these contract suggestions, learned from our experience in working directly with fleets, which will save you money and headaches down the road.
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The Achilles Heel of Natural Gas Vehicles: The Symptoms, Diagnosis and Prevention of Oil Carryover
Oil Carryover A large transit agency was experiencing engine performance problems with their natural gas buses. Their contracted service technician, responsible for maintenance of the fueling station, diagnosed the problem as an engine issue. NGVi was brought in after explaining to agency management that the sealed fuel system onboard the vehicle allows gas to flow only one way, making it improbable that the oil could leak from the engine into the onboard fuel system.

The technician in question, like many working on natural gas vehicles, assumed a vehicle problem even though the majority of engine performance issues are attributable to oil carryover, which is a problem that begins at the fueling station. If the vehicle is hard to start, hesitates under acceleration, runs rough or stalls frequently, chances are the problem is with oil from the natural gas fueling station compressor carrying over into the vehicle fuel system.
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Upcoming Training

Level 1: NGV Essentials
and Safety Practices

May 8, 2018
Olathe, KS

Level 2: CNG Fuel System
Inspector Training

May 9-10, 2018
Olathe, KS

Level 1: NGV Essentials
and Safety Practices

June 12, 2018
Minneapolis, MN

Level 2: CNG Fuel System
Inspector Training

June 13-14, 2018
Minneapolis, MN

Essentials of CNG Station Planning,
Design and Construction

September 24-25, 2018
Las Vegas, NV

Essentials of CNG Station
Operation and Maintenance

September 26-27, 2018
Las Vegas, NV


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About NGVi

Natural Gas Vehicle Institute is North America’s leading provider of training and consulting on natural gas as a transportation fuel.

Our services address the full range of natural gas vehicle and fueling issues, including:

Technical consulting services – Sizing and designing compressed natural gas fueling stations, vehicle assessments and technical assistance for fleets, CNG fueling station troubleshooting, natural gas vehicle maintenance facilities upgrades, liquefied natural gas fleet and fueling management.

Technical training – NGV Essentials and Safety Practices, CNG Fuel System Inspector Training, Heavy-Duty NGV Maintenance and Diagnostics Training, Light-Duty NGV Maintenance and Diagnostics Training, CNG Fuel System Design and Installation Training, Essentials of CNG Station Operation and Maintenance Training, Essentials of CNG Station Planning, Design and Construction Training and CNG/LNG Codes and Standards Training for Fire Marshals and Code Officials.


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