Abstract: A pollution control device having a tank provided with an inlet and an outlet arranged for passing a gaseous medium to be cleaned into the tank and through a bath of washing solution held in the tank. A blower unit, mounted outside of the tank, forces the gaseous medium through the bath. A line connecting the blower unit to the bath passes a quantity of washing solution through the blower unit for cooling the unit. Baffles are arranged partially immersed in the bath in the tank for creating a large surface across the gaseous flow and facilitating separation of particulate matter from the medium being cleaned. The baffles are advantageously in the form of a plurality of cylinders each constructed from a mesh material and tiered in one or more substantially vertical channels arranged within the tank.

Abstract: A pressure vessel adapted for connection in a high pressure gas line and having a coalescent type filter mounted to extract condensate; a vertical guide fitted with upper and lower magnetically operated switches at positions representing high and low condensate levels; a float carried by the guide for vertical reciprocation and having magnetic means for operating the switches; and an electrically operated valve connected to a condensate drain opening and to a control circuit connected to the switches whereby the condensate will be maintained within upper and lower limits.

Abstract: An airtight container, having two separated compartments, including an inlet to the first compartment and a flexible, gravel pick-up tube attached to the inlet. A cyclone separator is mounted on the second compartment with its separated particle outlet discharging into the second compartment. A connecting conduit connects the outlet of the first compartment with the inlet of the cyclone, so that the first compartment is a separator for gravel and dust and the second compartment is a dust container for the cyclone. A separate, high capacity air pump has its inlet connected to the cyclone's clean air outlet causing a flow of air through the unit for picking up gravel and dust through the flexible tube. For convenience the containers may be mounted on a truck, and both containers are unloaded through a common, sealable gate at the lower portion of the containers.