Micro-Design, Inc. (MDi) offers a complete line of standard CNG packages ready for use in any of your applications. We have small packages that will serve small CNG fleets ranging from 2 to 20 vehicles and larger packages that will serve 10 to 150 vehicles including transit buses, airport shuttle buses, garbage trucks, road sweepers, transports, etc. The heart of all medium to large packages is the high quality, industry proven GE Gemini compressor. It is a horizontal, balanced, opposed design that has been working out in the Oil and Gas industry for over 20 years,and has been employed in hundreds of CNG stations.

MDi offers complete CNG station solutions using these versatile packages along with storage, valve panels, dispensers and state-of-the-art controls. Special care is taken with both motor and engine alignment on MDi skid packages. A slight deviation from the true alignment can quickly cause seal and bearing problems on these high-pressure units. Each component is carefully selected to assure proper fit and all piping and tubing meets ASA B31.3 specification for high pressure applications.

Pipe flow rates are calculated based on the mass flow at operating conditions. Piping is normally Schedule 80 or 160 or is stainless steel tubing with extra heavy construction. All components are protected with relief valves, which are vented away from the package. Fire protection “Failsafe” valves are included on gas inlets and engine fuel lines. Each system includes an automatic blow-down of the high-pressure system. All lubrication systems include replaceable filters and all gas lines include either replaceable or “y” type strainers. The units are designed such that all parts are easily accessible for maintenance and replacement.

Electrical components are selected based on customer specifications and are available for compliance with Class 1, Div. 1 or Class 1, Div. 2 Rated Hazardous locations. The units comply with all requirements of NFPA52. Each skid is fitted with gas detection as standard and fire detection optionally. Standard MDi controls are CSA/Factory Mutual approved for operation in the specified areas. Each skid is thoroughly tested at the factory for full performance and all cylinders are monitored and adjusted during test for proper balance and load sharing.

MDi’s packages include Standard electric motors rated for C1D2 with soft start units shipped separately. Standard controls include 1 year of LevelCon web based service and ScadaPoint graphical interface. Sensors are provided for all pressure and temperature parameters including oil pressure, oil level, vibration, gas detection, etc.

Compressed Natural Gas is one of the cleanest burning motor fuels available to the world market. MDi fueling systems offer the most advanced technology and highest efficiency for vehicle fleet fueling available in the market. The MDi fueling systems are custom designed to meet the needs of the client. Systems are available in various configurations, pressures and flow rates. Small to large systems are available utilizing inlet pressures as low as 5 psig/ 34.6 kPa with discharge pressures to 5000 psig/ 344 bars. These CNG packages are designed to operate in the 100 SCFM (200 m3)/hr to 1500 SCFM (2411 m3)/hr capacity ranges.

MDi also offers High Flow Valve Panels and Controls for Bank Fill Priority and Banks/compressors Gas Flow Sequencing for Fast-Fill and Timed-Fill systems. Controllers incorporate Industry Standard “Accufil” type Fast-Fill algorithms for temperature compensated fills The Compressed Natural Gas (CNG) fueling industry utilizes a variety of sizes and compressor configurations to keep the fleets fueled and running. Mdi offers a wide range of compression systems to the CNG market. The standard Mdi compressor-charger assembly includes all of the components necessary for the compressor unit to operate 24 hours a day 365 days a year in most cases unattended. Sizing from 100 SCFM to 1800 SFM are in our normal range.All of the packages start with a structural steel base designed for the weight and torque of the particular application. All systems are designed on CAD 2000 systems so that all tolerances are predetermined before any assembly begins.

The main components of the Mdi compressor package include high pressure multi stage reciprocating compressors. Most units are either three or four stage depending on the inlet and outlet pressures. The prime mover for the compressor is selected to meet both the speed requirements and horsepower of the compressor at its most severe condition. Our policy on driver selection is to be conservative. The next size up will normally alleviate many operational problems and allow for future increase in capacity. The interstage gas coolers and engine oil coolers are all computer selected based on the engine and compressor manufacturer data sheets. All coolers are sized to meet the local conditions plus some. Enclosures are selected per Sound Suppression requirements and coolers are louvered to meet the requirements.

SENA Corporation’s Tank Level Monitoring provides instant notifications of low inventory or high usage through special sensors which can constantly monitor the levels of oil, industrial gas, water or any multitude of liquids in remote tanks. SENA is also capable of propane (LPG) tank monitoring, soil moisture monitoring, and fertilizer monitoring. User defined thresholds result in alert generation anytime there is an excellence of a defined tolerance allowing for timely corrective actions.