September 2016, Vol. 243, No. 9
TechNotes
Economic Solution for Vapor Recovery Operations
Tulsa, OK-based Murphy by Enovation Controls has introduced its VRU Pro, a new controller designed specifically for vapor recovery applications. The flexible, out-of-the-box solution pairs with smaller horsepower compressors in vapor recovery operations and is certified for Class 1, Division 2 hazardous area operations.
The VRU Pro can be used with an electric motor or natural gas engine. It is designed to use either AC or DC power. The controller is equipped with 18 fit-for-purpose fixed digital, analog, thermocouple and frequency inputs, and nine field-effect transistor (FET) and analog outputs. The VRU Pro is rated to operate in temperatures from -40o to 185o F (-40o to 85o C).
The controller keeps the compressor in a ready-to-start condition until tank pressure reaches a preset level. At this point, it starts the compressor to recover the vapors and draw pressure back down to the set point, when it then turns off the compressor.
The system also has the ability to facilitate a variety of advanced control capabilities, including automatic speed, recycle and capacity control through three-way proportional integrative derivative (PID) monitoring of suction/discharges and engine loading.
The software inside the VRU Pro offers great flexibility and ease of use. Operators select from preconfigured options using a tactile keyboard and 3.8-inch monochrome LCD display. The controller features CAN JI939 engine communications with a closed-loop PID algorithm for monitoring and control.
As emissions restrictions on tank batteries continue to increase, vapor recovery applications will be in demand. The VRU Pro requires no custom programming yet enables advanced features such as automatic starting and speed recycle/capacity control.
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