NGVConnection Newsletter - September 2012


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NGVi to Bring Compressed Natural Gas Fueling Expertise
to NACS Show Attendees 

Natural Gas Vehicle Institute (NGVi) gears up for an exciting event that will provide attendees multiple one-on-one opportunities with compressed natural gas fueling expert, Leo Thomason, at the NACS Show and PEI Convention. If you're attending the tradeshow, you're invited to stop by our booth in the Petroleum Equipment and Services Area (Booth 4935), October 8-10 at the Las Vegas Convention Center.

The NACS Show attracts more than 22,000 attendees from more than 60 countries and provides a comprehensive representation of products and services for the convenience and fuel retailing industry. As part of the tradeshow, Petroleum Equipment Institute (PEI) will host its annual convention, beginning on October 7 in the Petroleum Equipment and Services Area.

As gasoline and diesel fuel prices steadily increase, the petroleum equipment and services industry, encompassing PEI’s 1,600 member companies around the world, has responded with significant interest in compressed natural gas (CNG; average retail price of $2.08 per GGE) as a more economical way to power fleets and consumer vehicles.

NGVi founder and Executive Director, Leo Thomason will host a PEI 1-on-1 session: CNG Fueling Station Equipment, allowing attendees a chance to ask specific questions on the business opportunities and technologies involved in providing CNG as a transportation fuel. The session will take place in aisle 5400 in the Petroleum & Services area of the trade show floor from 2:00-3:00 p.m. on Monday, October 8.

During exhibit hours, Leo also will be available in the NGVi booth for one-on-one conversations with show attendees who seek advice on CNG fueling station issues on a first-come, first-served basis. Additionally, Leo and NGVi staff will share NGVi’s technical training options on CNG stations. The CNG fueling station training curriculum is designed for companies that are interested in or responsible for designing, building, operating and maintaining natural gas fueling stations, as well as equipment providers and those involved in permitting CNG stations. 


Reasons to visit NGVi’s Booth #4935

  • Exclusive opportunity for a one-on-one with compressed natural gas fueling industry expert Leo Thomason (To read Leo’s bio, click here.)
  • Information on NGVi technical training and consulting service options for CNG Fueling Station Sizing, Design, Operation, and Maintenance issues and NGVi Training class discount coupons
  • Daily Drawings for prizes include a top-of-the-line GPS navigation system, $250 airline gift card, and free registration for any NGVi live CNG Fueling Station Training Courses (valued up to $895)

Natural Gas Continues to Fuel Momentum in the Petroleum Equipment Industry
Conversations with Rick Long, General Manager, PEI

As interest in natural gas as a transportation fuel evolves within the petroleum equipment industry and the natural gas fueling infrastructure expands, Petroleum Equipment Institute (PEI) and NGVi have joined forces to provide CNG fueling station training services and products to industry members.


Recently, NGVi had the chance to sit down with PEI General Manager Rick Long, to gain insight on recent industry “buzz,” market trends, and PEI’s collaboration with NGVi .


Rick, can you provide a general background and company history about PEI?


PEI is a non-profit trade association that was founded way back in 1951. We represent companies whose businesses in one way or another revolve around the equipment that stores, meters or dispenses transportation fuel. As an organization, our mission is to be the leading source for the information our members need to succeed, adapt and thrive in what is obviously a constantly changing industry.

Can you tell us a little about who your members are and what they do?


We have 1600 member firms spread across four corporate divisions: manufacturers that make the fuel handling equipment; distributors who stock, install, and maintain that equipment; service & construction firms that also provide solutions to keep the equipment running; and affiliate members that offer a variety of supporting products and services. We also have a separate individual membership category for fuel marketing professionals—for example, managers who purchase fueling equipment for convenience store chains.


How did your members come to be interested in CNG as a transportation fuel?


For many years—decades, really—petroleum was the only game in town when it came to transportation fuel. But, obviously, that’s no longer the case. For the last several years, our members have been extremely interested in alternative fuels. What’s coming? How can they get involved? Where do the opportunities lie?  While a variety of alternative fuels are out there, compressed natural gas (CNG) is clearly at the top of the list among our members.  


Where do your members fit into the CNG fueling industry?


Well, that depends on the individual company’s business model. But the common thread seems to be using CNG as a way to extend the company’s existing expertise. CNG fueling stations represent not so much a change in strategy as a logical next step.

What feedback have you received from your members regarding their involvement in CNG fueling?


It’s an exciting time. A number of PEI members are now helping existing convenience store customers integrate CNG fueling infrastructure into their future plans. Just as important, CNG is proving to be a way for members to build relationships with an entirely new group of customers—often, municipalities, fleets and utilities that are converting to natural gas.

What challenges do you foresee for your members as they enter the CNG fueling market?

Expanding into a new arena is always a challenge. It takes good training, careful planning and a clear strategy. That’s one of the reasons we’re so excited about our relationship with NGVi and the insight they offer.

Can you expand on the partnership between NGVi and PEI?

We’ve had an extremely high regard for NGVi for a long time. Last February, our two organizations came together to offer a live two-day course on the design and construction of CNG fueling stations—the topics of greatest interest to our members. That initial course sold out in a matter of days. But even after registration was closed, the calls kept coming. Before long, we had a waiting list of more than 100 companies. That led us to add two more classes—both of which also quickly sold out. The new online course will allow many more members to take the course from the comfort of their own office. Leo Thomason, president of NGVi, also will be facilitating a CNG discussion at PEI’s October convention in Las Vegas—another great opportunity for our members to listen to and learn from a real expert.


How do you see the new online course fitting in with the member services you provide?

Some of our members just can’t afford to take several days off to travel to a live course. In those cases, the online video course is a perfect solution. Purchasers can fit the course into their schedule rather than the other way around. The 12+ hours of video are divided into 12 easy-to-digest modules that participants can view at their pace, at their convenience as often as they like over a three-week period. A company could, for example, work through the entire course with a series of short lunchtime training sessions. And, since the purchase license is for the company (not an individual), an entire team of technicians and managers can learn together for one low price—it’s a very cost-effective program.



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Eight Maintenance Practices to Help Ensure CNG Fueling Station Safety

By Annalloyd Thomason, Vice President/General Manager, NGVi

CNG fueling stations are designed and constructed according to a number of codes, standards and industry best practices—all with the purpose of ensuring safety.   Once construction is finished and the fueling station is operational, it is up to the maintenance technician to ensure its ongoing safety.  There are at least eight critical safety systems or devices installed at CNG fueling stations.  These systems and devices require regular evaluation and testing to ensure their operability.  Below we discuss the most common safety systems and devices, along with their recommended inspection and testing intervals.


Nozzles are the components of CNG fueling stations which facilitate the transfer of CNG from the station into the vehicles’ onboard fuel storage systems.  Nozzles are designed to not allow fuel to flow unless they are properly locked on the fueling receptacle on the vehicle.  Nozzles have a three-way valve controlling their performance.  The maintenance technician’s goal is to ensure that each nozzle performs as intended and at the highest level of safety.  While nozzles should be visually observed daily, NGVi recommends that at a minimum, nozzles be officially inspected every quarter or more frequently for high utilization stations.  Maintenance technicians should inspect the nozzles to determine whether the three-way valve handle is functioning properly and if the nozzle is capable of fully locking onto the receptacle.  Damaged nozzles must be replaced and sent to the manufacturer for repair.


Dispenser hoses are used to transfer CNG from the dispenser to the nozzle.  Generally, there are two types of hoses.  The first is made of four layers of synthetic materials.  Ideally, dispenser hoses should be visually observed every day for cuts, gouges, abrasions, soft spots, kinks, excessive heat exposure or other damage.  At a minimum, hoses should be officially inspected no less frequently than quarterly. This type of hose must be tested for electrical continuity periodically according to the manufacturer’s guidelines. This testing is usually performed by the CNG fueling station maintenance technician.

The second type of dispenser hose is made of two layers of synthetic material and one layer of steel braid.  The same visual inspections mentioned above should be conducted on these hoses, but this hose type does not require electrical continuity testing.

Dispenser Hose Breakaways

The dispenser hose breakaway is required by NFPA 52 and seals the hose and its connection to the dispenser in case of an accidental disconnection/drive away.  There are two types of breakaways.  One connects the hose to the dispenser—the second type is referred to as an “inline” breakaway, which means it is installed in the dispenser hose. Maintenance technicians should visually inspect breakaways to ensure that the main fuel line, as well as the vent line for each hose, has breakaways installed and that they are free of damage.  The interval for these inspections is the same as that recommended for nozzles and hoses.

Emergency Shut Down Device (ESD)

The ESD is designed to stop the flow of gas into the fueling station from the gas utility distribution pipeline as well as from the high-pressure storage system into the dispensers in the event of an emergency.   ESDs are required by NFPA 52 and should be periodically tested.  NGVi recommends these tests be performed at least quarterly. 

The only effective way for maintenance technicians to test EDs is to perform a manual test—which means the compressor must be operating and fuel must be flowing from the dispenser into the vehicle at the time each ESD is pressed.  This test ensures that the ESD is performing as intended (e.g., the compressor should shut down and gas should stop flowing immediately upon ESD activation.)  The ESD system is fail safe so the maintenance technician must clear the ESD event and manually re-start the CNG station equipment once each ESD is tested.

ESDs must be labeled with a specific sign that reads “CNG ESD.”  Maintenance technicians should verify that these signs are clean and visible during each CNG station inspection.

Safety Relief Valves (SRVs)

SRVs are over-pressure protection for various pressurized components of the CNG fueling station.  At a minimum, SRVs are installed on the dryer, inlet to the compressor, inter-stage on the compressor, on the blow-down tank, on the compressor discharge piping, on each ASME pressure vessel and on each dispenser hose.  These SRVs are required by NFPA 52 and must be re-certified every three years.  The maintenance technician’s role in this process is to remove the expired SRVs and replace them with recently certified SRVs.  The old valves are usually stored onsite until just before the valves in service are due to be replaced. They are then sent to a licensed hydrostatic testing facility for recertification.

Fire Extinguishers

NFPA 52 requires fire extinguishers to be installed in multiple locations throughout the CNG fueling station.  These extinguishers should be inspected by an authorized servicing organization once every year, and generally the maintenance technician is responsible for monitoring this process.  The types of fire extinguishers approved for CNG fueling stations include dry chemical and Purple K. 

Fugitive Leaks

It is unsafe to have any leaks of natural gas or liquids such as oil around a CNG fueling station.  NGVi recommends daily visual inspection of each major component of the station (dryer, compressor, skid, ASME pressure vessels, priority fill system and dispensers) to check for any gas or liquid leaks.  Detected leaks should be repaired as soon as possible.

NFPA Diamond Sign/Other Safety Signs

Each CNG fueling station is required to have one or more NFPA Diamond signs posted on or close to the ASME pressure vessels.  In the event of a fire or other incident, the NFPA Diamond sign tells firefighters that natural gas is being stored in the vessels so that they can address the hazards.  Maintenance technicians should include inspection of the signs in each visual inspection of the CNG station equipment and ensure that they are clean, legible and undamaged.

Additionally, most Emergency Evacuation Plans require the posting of emergency phone numbers to include fire department, medical, adjoining facilities and other relevant contact information in case of emergency.  Maintenance technicians should inspect these signs during each visual inspection of the CNG station and ensure they are legible. All other safety signs should be monitored by the Maintenance Technician to ensure they are clean and legible.

These minimum maintenance practices, along with other equipment specific practices, forms, checklists and other items, are included in NGVi’s two-day CNG Fueling Station Operation & Maintenance Training Course.  For more information, visit


NGVi Asks the Expert

Leo Thomason Speaks on the Petroleum Equipment Industry’s Recent Interest in

CNG Fueling Station Design, Construction, Operation, and Maintenance
By Kayla Vickaryous, Marketing Specialist, NGVi

In the past year or so, NGVi has witnessed growing interest in building CNG fueling stations from the petroleum equipment industry.  In your opinion, what is driving their interest? 

Because of the ten-year record low price of natural gas, demand for CNG as a transportation fuel is increasing rapidly nationwide.  Even a decade ago, CNG was considered by most as a niche fuel primarily for fleets, and there was a limited number of companies—primarily gas utility companies and a handful of specialized CNG retailers—that provided CNG fueling stations mostly for captive fleet customers. 

Then came the huge recoveries of natural gas from shale formations in the United States, which has increased our gas supply in the U.S. to 150+ years—and growing. Couple that supply with the fact that natural gas is a domestic fuel—produced right here in the United States—and CNG has become the darling of transportation fuels.

It is logical, then, that the petroleum equipment industry become involved in building CNG fueling infrastructure.  They are the companies that have built the network of more than 160,000 liquid fuel stations over the last century, and it makes sense that they will play an important role in the development of the public CNG fueling network going forward. 

And Gas Exploration and Production companies have done a lot to encourage their involvement.  For example, Chesapeake Energy is partnering with Love’s Travel Stops to add publicly-accessible CNG to Love’s existing liquid fuel stations across Oklahoma.  It’s a win-win for both organizations.  Chesapeake is transitioning its entire 4,500 vehicle fleet to CNG, and the resulting fuel demand helps support the development of public CNG fueling infrastructure to serve additional customers in the entire state of Oklahoma. 

So it’s great that the petroleum equipment industry is getting involved with CNG, but aren’t there significant differences between building a liquid fuel station and a CNG station? 

Yes—the two types of fuel are entirely different just based on their physical states—liquid versus gas.  In a conventional fueling station, liquid fuel is delivered to the station in a truck and then stored in underground tanks.  Liquid pumps then pump the fuel into the vehicles, which is done at atmospheric pressure.

In a CNG fueling station, natural gas is delivered via an underground distribution pipeline from the local gas utility, where it is highly compressed and then stored in above ground ASME pressure vessels.  CNG is not pumped—it is transferred into vehicles based on pressure differential between the vehicles’ onboard fuel storage cylinders and the fueling station ASME pressure vessels. 

There are components required for a CNG fueling station that are not necessary at liquid fueling stations —including the natural gas dryer, compressor, high-pressure storage and dispensers that are designed specifically to handle pressurized gas.

So what challenges do these differences present for companies accustomed to designing and building liquid fuel stations who now want to also build CNG stations?

Basically, traditional liquid fueling station suppliers/builders need to learn an entirely new system.  CNG fueling stations are governed by different codes and standards.  Additionally, those who build liquid fueling stations are accustomed to using entirely different building materials and they utilize different design and construction practices than for CNG.

One seemingly tiny, but important difference is that liquid fuel stations use threaded steel pipe to connect the underground fuel storage to the dispenser. Because CNG is a high-pressure gas, we use stainless steel tubing that is smaller in diameter. While liquid fuel pipe is buried directly into the ground, a CNG station’s stainless steel tubing is installed in conduit which is then buried underground.

Another example is gas drying.  Because there is water in almost all natural gas that comes from a utility distribution system, a gas dryer is used at the station to remove the water from the gas.

I could go on citing hundreds of examples, but you get the idea.

I’ve heard that one of the most significant differences between CNG and liquid fueling stations has to do with sizing.  Can you explain this more?

Yes. If demand at a liquid fueling station exceeds its current capacity, you can relatively easily increase the underground storage, pumping capacities, dispensers—or a combination of all three.  In the short run, you can increase the number of deliveries made by the tanker truck, so that customers are never unable to fuel and become frustrated and dissatisfied with the station’s performance.

CNG fueling stations, on the other hand, are sized based on peak demand at peak fueling times.  If the station is sized too small, a range of negative outcomes is possible including taking an inordinate amount of time for a customer to get fuel to customers being totally unable to fuel.  Both of these situations result in dissatisfied customers.  On the other hand, if you broadly oversize a station, the owner will have invested significantly more capital in the station than optimal, which will negatively impact his or her return on investment.

So if the design and construction of a CNG station is unique, are the operation and maintenance practices also different?

Yes. The operation and maintenance practices for CNG stations are equally different than those for liquid fuel stations.  Because of the unique CNG station components (especially dryers, compressors, and high-pressure storage), the maintenance practices have to be tailored to the high-pressure fuel. One of the main goals for CNG fueling station maintenance practices is to ensure gas quality.

What do you mean by gas quality?

Gas quality is one of the most significant factors that can adversely affect CNG fueling station components and vehicle performance. Today’s natural gas engines require clean, dry gas—free from water, oil and other contaminants.  Gas quality is determined by the chemical composition of natural gas, which varies from location to location, as well as water content, oil, particulate matter, propane that may be used in the utility distribution system for peak-load shaving and other factors.  CNG fueling station components most frequently affected by poor or low gas quality include the gas dryer, compressors, high-pressure storage systems and dispensers. Maintaining this equipment requires special filtration and maintenance practices

So how can those who are unfamiliar with the differences in designing, building, and maintaining a CNG fueling station acquire the appropriate education?

I’m happy to say that 17 years ago, we developed specific training curriculum on CNG Fueling Station Sizing, Design, Operation and Maintenance.  We later split that curriculum into two distinct courses—CNG Fueling Station Sizing, Design and Construction and CNG Fueling Station Operation & Maintenance. Today NGVi offers the only technical training available in the United States on all aspects of both building CNG fueling stations (including planning, budgeting, equipment specifications, safety, codes and regulations, permitting, construction and more) as well as CNG fueling station operation and maintenance. We continually update the curriculum to keep it current, and have trained hundreds of satisfied technical professionals across the country.

Last spring, NGVi partnered with the Petroleum Equipment Institute to offer a customized version of our live CNG Fueling Station Design and Construction training to PEI members.  We delivered three classes—one each in in Las Vegas, Chicago and Baltimore.  We recorded the Baltimore class live, and NGVi and PEI have partnered to make that video available via the PEI website. 

To learn more about NGVi’s consulting services and training options, visit


If you have are attending the 2012 NACS Show, October 8-10, and have specific questions regarding NGVi consulting services and training options for your company, Leo Thomason will be available for one-on-one in the Petroleum Equipment and Services area (Booth #4935).

Additionally, Leo Thomason will host a PEI 1-on-1 session: CNG Fueling Station Equipment, allowing attendees a chance to ask specific questions on the opportunities and infrastructure surrounding CNG as a transportation fuel. The session will take place in aisle 5400 in the Petroleum & Services area of the trade show floor from 2:00 - 3:00 p.m.

Four Major Challenges for CNG Retailers

By Kasia McBride, Marketing Manager, NGVi

While there are many participants involved in CNG infrastructure development, CNG retailers are one of the most influential groups because of their direct impact on customer experiences and their ultimate decisions about using natural gas as a transportation fuel.

To enhance customer satisfaction, retailers must make using CNG convenient, reliable, cost competitive and user friendly.  This may sound easier than it actually is.

Retailers take the most financial risk in infrastructure development.  Publicly-accessible CNG stations can cost hundreds of thousands—if not millions—of dollars, depending on the size.  Building a CNG station for retail use requires careful planning and forecasting of current and future demand so that the station can be sized appropriately. In addition, retailers must determine optimal locations for CNG stations, identify and grow their customer base, and be able to control cost factors so that they can price fuel competitively with gasoline, diesel—or even other CNG retailers.

In a study conducted by NGVi, we interviewed existing CNG retailers about their major challenges and the strategies they are using to overcome them.  They reported three major challenges described below.

1. Generating demand fast enough at new stations.

One of the most significant challenges for the start-up CNG retailer is building demand fast enough to facilitate positive ROI. The primary strategy that is used to help overcome these challenges involves using anchor fleets to create a consistent base demand. This is usually accomplished by identifying one or more fleets that provide significant demand and that will agree to purchase/use natural gas vehicles and obtain fuel at that station and/or from that retailer over a longer time period.  Obviously, the quicker a major and consistent quantity of fuel is sold at the station, the quicker cash flow goes positive for the retailer and the better the ROI. 

2. Minimizing costs.


Minimizing costs is the opposite side of the ROI see-saw from generating demand.  Both capital and operating costs are included as factors.  Strategies that help reduce natural gas costs and overall station investment costs have the most impact on the competitiveness of fuel price, which influences demand and consequently enhances return on investment (ROI) for the fuel retailer.   Specific strategies that can help accomplish this goal include:


  • Keeping overall gas prices as low as possible.  There is a fine line here for the retailer between the desire to earn maximum margin on the early sales of fuel from the station and keeping CNG costs competitive.
  • Taking advantage of special tariffs established by gas utility companies for the sale and use of natural gas as a transportation fuel .
  • Taking advantage of capital cost offsets, which could be in the form of federal tax credits, state or local incentives, or other partnership arrangements between a retailer and other members of the natural gas supply chain.


3. Being able to properly size and build CNG stations that are adequate to accommodate current and future demand.

CNG retailers must hit that sweet spot when sizing a CNG station.  What that means is that the retailer must size each station to adequately meet current (short-term) demand AND near-term projected future demand as closely as possible.  The ultimate goal is to build a station so that it is neither undersized nor oversized.  If a CNG station is sized too small, customers may not be able to get the fuel they need and will be dissatisfied.  If it is sized too large, the retailer will have invested perhaps tens or hundreds of thousands of dollars in excess compression or storage capacity and will not achieve positive ROI as quickly as projected.  CNG retailers sometimes have the option of building stations modularly so that the cost of expansion, when necessary, is minimized. 


4. Lack of well-trained maintenance technicians.

Maintenance is also a critical issue for CNG retailers for obvious reasons.  Ensuring fuel quality is critical to ensure vehicle performance and customer satisfaction.  This requires routine preventative maintenance, and when stations fail, they need to be repaired as soon as possible.  Maintenance technicians must be familiar with the equipment and its functions, as well as the specialized maintenance practices that will ensure optimum performance of the CNG station—and reduce the risk of providing poor quality fuel that can damage engines. 

CNG retailers have great opportunity—coupled with great challenges.  They must foster long-term relationships with their customers. They must guarantee high-quality fuel and the best possible experience for customers while providing competitively priced CNG. And they must find the right balance between providing fuel that is cost competitive while earning an acceptable rate of return.  Ultimately, customer satisfaction will depend equally upon the performance of their vehicles and the reliability and consistency of their experience with the fuel.  Both of these factors are in the CNG retailer’s hands.

CNG Fuel Price Report
From Clean Cities Alternative Fuel Price Report published by Argonne National Laboratory for DOE's Clean Cities Program

Overall Average Fuel Prices (as of July 2012)


Nationwide Average Price for Fuel This Report

Nationwide Average Price for Fuel Last Report

Change in Price This Report vs. Last Report

Units of Measurement

Gasoline (Regular)




per gallon





per gallon





per GGE

NGVs & CNG in the News

Horsepower Group Ready to Saddle Up Natural

Sept. Closes Strongly With Multiple CNG Sites Now Open For Fueling--NGT News

Kansas City Transportation Company Begins Deployment Of Compressed Natural Gas Cabs--NGT News

Phosphorus-Free Lakes, Natural Gas Vehicles Two Goals in 2013 County Budget--The Cap Times

Growing Number of Trucking Companies Consider Switching to Natural Gas--Calgary Herald

To read more, click here.

Upcoming Training from NGVi

CNG Fueling Station Design Training

November 13-14, 2012 | Downey, CA

Training for public and commercial sector professionals on the most up-to-date methods and practices for sizing, designing, specifying, and constructing a CNG fuel­ing station.

CNG Fueling Station Operation & Maintenance Training

November 15-16, 2012 | Downey, CA

Comprehensive curriculum covers everything from a basic introduction to compressed natural gas (CNG) to how to conduct a natural gas fuel station safety inspection.


Click here to Register

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Upcoming Training

Level 1: NGV Essentials
and Safety Practices

August 21, 2018
Atlanta, GA

Level 2: CNG Fuel System
Inspector Training

August 22-23, 2018
Atlanta, GA

Level 1: NGV Essentials
and Safety Practices

September 11, 2018
Boothwyn, PA

Level 2: CNG Fuel System
Inspector Training

September 12-13, 2018
Boothwyn, PA

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

Level 1: NGV Essentials
and Safety Practices

October 2, 2018
Sacramento, CA

Level 2: CNG Fuel System
Inspector Training

October 3-4, 2018
Sacramento, CA


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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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