Standard MVI catalogued models range in capacity from 40 to 4,749 tons of refrigeration for ammonia depending on the high stage suction temperature and are based on a 95°F liquid feed temperature.

Depending on the method chosen to pre-cool the liquid feed to the low temperature side of the the refrigeration system, the MVI can be arranged to to either flashcool or sub-cool the liquid. Flashcooling provides for the most economical equipment and operating cost. The sub-cooling method is recommended for applications where the liquid is being fed to a remote location. It is accomplished by adding a pipe coil inside the vessel. This arrangement changes the model nomenclature from MVI to MVIC.

Surge volumes for the MVI range from 5.2 to 766 cubic feet and for the MVIC range from 2.9 to 238.3 cubic feet.

Matrix LLC – Liquid Level Control

• Reads 4-20 mA signal from level probe and provide visual readout in digital and color bar graph form on panel
• Adjustable high and low level alarms and cut outs
• Two 4-20mA analog outputs for control of proportional feed valve(s)
• Built in transformer for 24 VAC or 24 VDC power to motorized valve
• Door mounted (7) button keypad – no need to open enclosure to change settings
• Easy-to-read 16-character alphanumeric display with LED dual color bar graph
• Communication via industry standard protocol MODBUS-RTU over RS-485
• Capable of remote monitoring and control of system parameters
• UL/cUL listed NEMA 4 steel enclosure
• Factory mounted and wired requiring only a single power connection in the field

Standard Vessel Design

• ASME, 250 psig, with dual vapor relief assembly
• National Board registration
• Stainless steel nameplate bracket and standoff to prevent corrosion
• Vertical vessel configuration in 16” to 144” outside diameter range and vessel lengths of 96” to 195”
• Internally routed oil pot vent piping reduces insulation cost and potential for shipping damage (not available on small models)

Oil Pot

• ASME, 400 psig, with single, replaceable, cartridge style vapor relief assembly set at 150 psig
• Relief discharge piped internal to the main vessel
• Optional dual relief assembly and/or relief to atmosphere

Liquid Level Column

• Level indicating column with valves, level eyes, frost shields, and oil drain
• Cable type, electronic level probe as standard
• High level shutdown float switch for compressor protection

Proportional Liquid Feed Assembly (Optional)

• Modulating valve minimizes pressure surges and protects pumps from cavitation
• Backup solenoid valve provides positive shutoff in the event of a power failure
• Can configured as a single or dual liquid feed assembly

Finish

• Vessel hydrostatically or pneumatically pressure tested
• Factory package piping welded and tested in accordance with ASME B31.5
• Surface prepped to SSPC-SP6 and painted with high quality two component, high solids epoxy coating
• Entire assembly is evacuated to eliminate moisture and shipped with 15 psi dry nitrogen charge

• Sub-cooling coil
• 300, 350 and 400 psig vessel design rating
• Corrosion allowance on vessel shell and heads, and/or nozzles
• Post Weld Heat Treatment (PWHT)
• SA333 Grade 6 Low temperature pipe
• 1.5 kw Oil pot heater
• Radiography of pipe welds
• Seismic design calculations
• Conventional on/off solenoid and hand expansion liquid feed assembly (single or dual)