SIMULATION OF THREE STAGE VAPOUR COMPRESSION REFRIGERATION …
WHY TWO-STAGE COMPRESSION?
Transcript of WHY TWO-STAGE COMPRESSION?
WHY TWO-STAGE COMPRESSION?
High pressure capabilities (pressure to 500PSIG)
Improved energy efficiency (higherCFM/Horsepower)
Reduced compression ratios per stage
Reduced internal leakage losses
Longer bearing life
APPLICATIONS
Gas Gathering
Well-head Gas compression
Fuel Gas Boosting
Vapor Recovery
Inert Gas Boosting
Landfill Gas Compression
Biogas Compression
Syngas Compression
Two-stage rotary screw compressors are very cost-effective for handling high volumes of gas at higher
pressures in field gathering, vapor recovery and other
applications. The work is divided between two-stagesreducing the forces on the rotating elements and
bearings.
6400 Series package features include our Evolution Xmicroprocessor based control panel with touch-screen.This easy to operate panel provides clear LCD read-out
of actual pressure and temperature status, shutdown setpoints, operating history etc. Recycle valves are
controlled by digital smart positioners.
In many applications, rotary screw gas compressors offer
a lower initial investment, reduced maintenance costs andimproved operating efficiencies over conventional
reciprocating gas compression equipment.
Low maintenance and high reliability are inherent with
rotary screws because they have few moving parts.There are no valves, rings or packing to wear out or cause
loss of efficiency.
Smooth operation results from no unbalanced forces andno pressure pulsations. No foundation is required.
Gas differential pressure provides oil circulation for properlubrication at differential pressures over 60 PSI. An
optional oil pump is available for applications with lessthan 60 PSI differential pressure.
Lower Initial CostsThe up-front cost of a rotary screw compressor is
considerably lower than that of a reciprocating type unit
with the same capabilities. The compressor blocks are
complete with no need for special cylinder sizing or
pulsation vessels and take up far less space in the overall
package design. Package design also requires less
interconnecting piping, which lowers the assembly timeand costs.
Lower Operating Costs
With few moving parts and long-life bearings, the rotary
screw compressor provides a lower operating cost thanreciprocating and rotary vane compressors. With properpreventive maintenance, a rotary screw compressor will
provide years of trouble-free service. They require verylittle maintenance – only changing of the oil filters
regularly, monitoring the oil for contaminants orbreakdown and changing the oil when necessary.
Increased FlexibilityRotary screw compressors are proven to be the most
cost-effective solution for many gas compression
applications. Their ability to operate throughout a widerange of conditions gives the rotary screw a distinct
advantage over all other types of compressors.
Pulsation Free CompressionRotary screw technology eliminates pulsations, common
in other compressor types, virtually eliminating anyexcessive vibration possibilities.
THE LOGICAL CHOICE WHEN THERE’S NO TIME FOR DOWN-TIME
FULLY PACKAGED - Every Vector 6400 Series two-stage compressor package is completely assembled and testedunder load to make sure it leaves our plant in perfect operating condition.
FIELD PROVEN DESIGN - Vector 6400 Series packages incorporate field proven LeRoi oil-injected rotary screw
compressors which are manufactured right here in North America.
INTEGRAL GEARING – With a wide range of standard gear ratios available, LeRoi offers the most cost-effective andefficient compressor selection in the industry. This wide selection of gear ratios, allows us to optimize the compressor
performance in relation to drive speed and horsepower.
LONG BEARING LIFE – Using roller bearings on the inlet end and tempered roller bearings on the discharge endresults in a long bearing life. All bearings also have steel cages for corrosion resistance and custom designed internal
clearance.
HEAVY DUTY CONSTRUCTION - All iron and steel construction, with no copper or copper alloys, makes LeRoi
compressors compatible with a variety of gases including both sweet and sour natural gas, biogas, syngas, nitrogenetc. Positive rotary shaft seals keep lubricants in and air out.
FULL RANGE OF ELECTRICAL CLASSIFICATIONS – Vector 6400 Series compressor packages are available forunclassified, Class 1, Division 2 and Class 1, Division 1 electrical classifications.
ENGINEERED FOR MAXIMUM SAFETY – All packages are manufactured to ASME code and all provincial/state
electrical code requirements. Pressure vessels are hydrostatically tested for complete user safety and equipped withapproved ASME code safety relief valves.
VARIABLE Vi/INTERNAL PORTING – LeRoi’s adjustable Variable Vi on the HGS17, HG17, HG24, LG30 and LGL30gas compressors allows discharge porting to be selected “on the go”. This matches the internal compression to the
application requirements for maximum compression efficiency. For HG10 and HG12 units, low, medium and highratio internal porting is available.
EVOLUTION X CONTROL PANEL – Evolution X is a full-featured compressor control panel that brings managementof all systems together on a 5.7” color touch-screen. Suction and discharge pressures are managed using a
combination of analog I/O and onboard PID capability. Compressor operating parameters, relay status and system
fault information are clearly displayed on-screen, so users can easily make necessary adjustments. Because
Evolution X control panels use analog outputs and dry contacts, they can communicate with virtually any variablefrequency drive or across-the-line motor starter.
OPTIONAL OPTIMIZER PLUS VARIABLE CAPACITY CONTROL SYSTEM – Applied Compression System’sOPTIMIZER PLUS step unloading system is an available option on Vector 6400 Series compressor packages. This
system utilizes a series of by-pass ports that are located on the side of the compressor so that progressive steps ofby-pass to the inlet cavity can be obtained, reducing the volume of gas trapped for compression. The result is a
reduction in capacity and horsepower. The amount of turndown depends on the number of ports that are opened.
As each valve is fully opened the capacity will be reduced by approximately 13% and the power reduced by 6%.Depending on the compressor speed and operating conditions, up to 50% capacity turn-down can be achieved, as
well as corresponding energy saving of up to 25%.
CUSTOM DESIGNED PACKAGES – Applied Compression is dedicated to servicing custom design applications. Ifone of our existing models does not meet the exact specifications of your application, we offer custom applicationassistance to either modify an existing model or develop a customer specific compressor. The flexibility of our Custom
Design Services makes Applied Compression the perfect solution for your custom application needs.
STANDARD FEATURES
STANDARD FEATURES
Asymmetrical rotary screw design
ASME code oil-gas separator with oil level gauge and drain valve
High discharge pressure or low suction pressure recycle control valve
Inlet check valve
Discharge check valve
Discharge minimum pressure controller
Inlet separator with automatic dump valve
Air or water-cooled gas aftercooler
Air or water-cooled oil cooler
Thermal bypass valve
Suction pressure indicator
Discharge pressure indicator
Suction temperature indicator
Discharge temperature indicator
Evolution X compressor control panel (Class 1 Div. 2 rated)
Low suction pressure safety shutdown
High suction pressure safety shutdown
High discharge pressure safety shutdown
High discharge temperature safety shutdown
High inlet separator liquid level shutdown
OSHA approved coupling guard
Structural steel skid with checker plate deck and lifting lugs
Initial fill of lubricant
Available in Class 1 Div. 2 (standard) and Class 1 Div. 1 (optional electrical rating.
Toll Free (855) 417-2396Fax (250) [email protected]
CANADIAN ADDRESS400 Industrial Road ACranbrook, BC V1C 4Z3
U.S. ADDRESSPO Box 111Eastport, ID 83826