Fuel Vapor Recovery System

Currently between 7 000 and 9 000 vrus are installed in the oil production sector with an average of four tanks connected to each vru.

Fuel vapor recovery system.

Vapor recovery units vrus on storage tanks. Vapor or vapour recovery is the process of recovering the vapors of gasoline or other fuels so that they do not escape into the atmosphere this is often done or required by law at filling stations in order to reduce noxious and potentially explosive fumes and pollution. These vapors are then burned through the combustion chamber during vehicle operation preparing purging the canister for the next refueling event. As of 2000 all new light duty gasoline powered vehicles sold must be equipped with orvr systems.

The negative pressure created in the underground storage tank by the withdrawal combined with the pressure in the. Vapor recovery unit how it works vrus are mechanically driven and are powered by an electric motor or gas engine depending on what s available. The epa adopted regulations implementing this requirement in 1994. Vapors recovered as liquids have yielded 0 1 1 0 of the volume of gasoline loaded depending on many variables i e.

The 1970 71 ecs used a complicated fuel tank which had a small inner tank at the top connected to the main tank chamber by a very small passageway to prevent overfilling. Stage ii vapor recovery systems differ from stage i by collecting gasoline vapors displaced from the vehicle fuel tank when a customer dispenses fuel from a gas pump. Onboard refueling vapor recovery orvr is a vehicle emission control system that captures fuel vapors from the vehicle gas tank during refueling. Vrus are relatively simple systems that can capture about 95 percent of the btu rich vapors for sale or for use onsite as fuel.

Stage ii vapor recovery systems were once required in area a phoenix metro but have since been decommissioned and are now prohibited from use. A system for recovering vapor and liquid emerging from a tank as it is being filled in which the volumetric flow of a recovery pump that withdraws the vapor through a recovery tube is made equal to the volumetric flow of a fuel delivery pump with a microprocessor. Temperature vapor pressure etc. Chrysler s version was dubbed vapor saver or ecs evaporation control system.

Page needed there are two types of vehicle emission control systems. The orvr and the stage ii vapor recovery system without either of these two systems fuel vapors trapped inside gas tanks would be. For example a vapor recovery system for storage tanks can be used to recover vent gas from crude oil and distillate tanks at storage facilities. An onboard refueling vapor recovery system orvr is a vehicle fuel vapor emission control system that captures volatile organic compounds voc potentially harmful vapors during refueling.