P C McKenzie Company

Industrial Boiler and Natural Gas Compressor Sales

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CALL US TODAY - 877-244-4883

  • Compressors
    • Sauer Natural Gas Compressor
    • IR Compressor Packages
      • IR 05H25NGSX
      • IR 05H25NGDX
      • IR 20H40NGSX
      • IR 20H40NGDX
    • CNG Rental Units
    • Small CNG Station for Fleet Vehicle Refueling
    • Natural Gas Compressor Valve Rebuild Program
    • IR Compressor Parts
    • IR Bare Blocks
    • Troubleshooting Guide
  • BOILERS
    • Boiler Service and Boiler Repair
    • Patterson Kelley Condensing Boilers
    • Patterson Kelley Non Condensing Boilers
    • Unilux Water Tube Boilers
    • Cast Iron Boilers
    • Hurst Boilers and Hurst Boiler Parts
    • Atlas Boiler
    • Ajax Boiler Gaskets and Ajax Boiler Parts
    • Venting Solutions
      • Engine Generator Turbine Exhaust
      • Zero Chase Grease Duct
      • Boiler Domestic Water Heater Venting
    • Draft Induction Fan
    • Boiler Burners
      • Industrial Combustion Lo-Nox Burners
      • Gordon Piatt Burner Parts
      • Weishaupt Burner Parts
  • AXELSON
    • Axelson Relief Valves
      • Axelson Relief Valve Maintenance
      • How Does an Axelson Safety Valve Work?
      • Garrett Safety Relief Valves
      • Axelson Orifice
      • How to Test Relief Valves – Axelson Test Stand for Pilot Valves
    • Axelson Spare Parts
    • Axelson ESP Pilot Sensor
    • Axelson ESPHL – High/Low Pressure Controller
    • Axelson Sand Probe Valve with Sensor
    • Axelson CRBBM Relay
    • Axelson Actuator Pneumatic Diaphragm Actuator
    • Axelson PRV Relay
    • Axelson Differential Pressure Sensing Unit
  • OIL CONTROL
    • Oil Level Regulator Davco Ren
    • Slow Flow Meter
    • Continuous Oil Change Module by Ren
    • Liquid Level Switch by Ren
    • Oil Supply Tanks
  • Boiler Parts
    • Boiler Pumps
    • A & F Chemical Feed Pumps
    • Chemical Feed Tanks
    • Everlasting Blowdown Valve
    • Kewanee
      • Kewanee Boiler Parts
      • Kewanee Vortex Damper Rebuild
      • Kewanee Boiler Gaskets
      • Kewanee Burner
      • Cam Assembly
      • Kewanee Burner Blower Wheel
    • Pressure Reducing Regulators
    • Boiler Gaskets
    • Flame Controls
    • Weishaupt
    • Gauge and Site Glass
  • AMOT
    • Amot Thermostatic Control Valves
    • 3-Way Control Valves
    • Diaphragm Operated Gas Valve
    • Air Intake Shut Off Valve
    • Bearing Temperature Detector
    • High Temperature Valve
    • Overspeed Sensing Valve
    • Master Safety Control
    • Metal Particle Detector
    • Amot Temperature Sensor
    • Amot Electric Trip Lever Switch
  • RESOURCES
    • CNG Safety – Is Compressed Natural Gas Safe?
    • CNG
    • CNG Storage Cascades
    • NGV Fast Fill Station
    • NGV School Bus Refueling
    • NGV Service Tips
    • NG Compressor Troubleshooting
    • Boiler Service Tips
      • Boiler Questions About Your Boiler
      • Boiler Glossary
      • Boiler FAQ
  • Charging Station

CNG Storage Cascades

cng-storage

One of the key components in a fast-fill NGV Refueling Station is the CNG Storage. In fact, the inclusion of ASME ground storage vessels really defines a fast-fill refueling application.

Fast-Fill stations allow vehicles to pull up and refuel in a short period of time. In order to fuel vehicles quickly, gas must be drawn from pre-pressurized storage vessels. Unlike gasoline stations, natural gas must be stored above ground. And because it is stored at high pressures it must be contained in ASME (American Society of Mechanical Engineers) coded vessels. Vessels are 20” in diameter and approximately 23 foot long. Each vessel will hold 10,000 cubic feet at 5,000 psi. They are arranged in a three bank cascade meaning that there is a low bank vessel, a medium bank vessel and a high bank vessel.

As a general rule of thumb, only 40% of the stored gas in a three bank cascade arrangement is available for refueling. This means that a 30,000 cubic foot storage cascade will deliver about 12,000 cubic feet of natural gas quickly. This equates to about 96 equivalent gallons of gasoline.

A priority sequential panel is used to direct compressor discharge to the high, then medium, then low bank. When filling, a vehicle will draw first from the low bank, then the medium bank and top off from the high bank. The Compressor will replenish the cascade by filling the high bank first, then the medium bank and finally the low bank.

Storage Spheres are an alternative to the long tubes shown previously. Another form of storage that has lost popularity are DOT bottles. They resemble welding bottles and have burst disks instead of ASME relief valve. We do not like these for a number of reasons. First they need to be re-certified every five years, and second they do not have any drain valves.

The amount of storage you need depends on the amount of vehicles, the amount of gas each vehicle requires, and the time frame in which the vehicles need to be filled.

There are four types of tanks available, designed to hold natural gas at pressures up to 3,600 psi:

Type 1: This is an all metal cylinder made of steel. There is no covering, other than paint, on the outside of the cylinder. This is the most common type of cylinder and least expensive. It is also the heaviest.

Type 2: This is a metal cylinder (steel or aluminum) with a partial wrapping that goes around the cylinder. The wrapping is usually made of glass, or carbon, contained in an epoxy or polyester resin. This design weighs less than the type one and costs more.

Type 3: This type of cylinder is fully wrapped with the same kind of material used for the partial wrapping of a Type 2 cylinder. This type of cylinder has a metal liner usually aluminum. They are lightweight and even more expensive than Type 1 or Type 2.

Type 4: This type of cylinder is fully wrapped with the same kind of material used for the partial wrapping of a Type 2 cylinder. This type of cylinder has a plastic liner, it is very light and the most expensive.

ll CNG cylinders are constructed to withhold up to 1.25 times their operating design pressure and include valves and other safety devices to prevent leakage.

Natural Gas for Our Future
Natural Gas an ideal fuel source for many reasons, including safety. Natural Gas is lighter than air. This means that it will not puddle (like gasoline) or sink to the ground like propane, which is heavier than air. Instead, Natural Gas will rise and dissipate in the atmosphere. Natural gas also has a higher ignition temperature. This means that it is much harder to ignite. Also the storage systems used for compressed natural gas are infinitely stronger that the gasoline tanks found on cars and trucks today.
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CONTACT US

Toll Free: 1-877-244-4883
Fax: 412-257-8890
Phone: 412-257-8866

SHIPPING ADDRESS
P.C. McKenzie Company
1365 McLaughlin Run Road
Pittsburgh, PA 15241

MAILING ADDRESS
P.C. McKenzie Company
P.O. Box 112638
Pittsburgh, PA 15241

- P.C. McKenzie Company is located South of Pittsburgh, Pennsylvania -


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