CNG Storage Spheres


Allied Equipment designs and manufactures products and services for CNG and hydrogen refueling and for nitrogen and oxygen storage. Our first CNG storage sphere was designed and manufactured more than two decades ago, and today we are the largest American-owned manufacturer of spherical CNG storage. The design and engineering teams at Allied Equipment have succeeded in making our storage spheres the most valued units on the market. We also offer spheres for compressed air applications, and 36″ ID sizes if needed.

Allied Equipment continues to lead the industry with our unique technology by introducing our stackable design. This unit allows for capacity upgrades at CNG refueling stations without the need to acquire more land.

CNG Storage Spheres (Div 2) range from 5,500 to 10,000 PSI :

  • 48” inside diameter
  • 33.5 cubic ft. water volume
  • 250 gallon capacity
  • 1” relief valve with isolation and bleed block included
  • 1/2” drain valve included
  • Outer dimensions (63”(H) x 56”(W)
  • Weight 8,735 lbs.
  • White epoxy paint

The Allied team is dedicated to advancing alternative fuels. We actively incorporate all efforts to comply with environmental safety precautions and are involved with the Department of Energy’s Clean Cities Coalition, the Texas Natural Gas Vehicle Alliance, and other alternative fuel industry associations.

Need a quote? Complete the RFQ form, or call now (432) 367-6000 to reach our CNG sales department.


Allied Equipment takes a proactive approach to new product development and our engineering staff takes pride in solving design challenges.  The small foot print of our 48″ ID spheres maximizes opportunities to locate CNG fueling stations on limited real estate.  A typical station will have three spheres that measure only 17’ properly spaced side by side, compared to the 23’ of standard cylinder tubes. Configuration flexibility, such as installing spheres in a triangle or ‘L’ shape, allows the station installer to utilize existing space that may not accommodate other storage tanks. With Allied Equipment’s stackable CNG storage sphere, virtually any installation challenge can be overcome.

Project – Greer, South Carolina’s first CNG fueling station posted by Greer Commission of Public Works for their CNG Infrastructure and Vehicles Project. Greer Commission of Public Works

Using your customized specifications or our innovative standard designs, we strive to produce the highest quality products built to the strictest standards in the oil and natural gas industries. All of our installation services can include contract maintenance, as well. Test our reputation for outstanding dependability and call today for CNG storage solutions.

Just getting started exploring the cost benefits of switching your fleet to compressed natural gas?

Here are some helpful resources to guide you, available from the Dept of Energy’s Alternative Fuel Data Center: