Abstract: A method for providing a continuous injection of a constant amount of a desired treatment chemical into a flowing stream is described. This method insures that the concentration of the desired treatment chemical is maintained at a relatively uniform concentration throughout the flowing stream. A constant flow pumping apparatus for providing the continuous injection of the treatment chemical is also described. The pumping apparatus includes multiple positive displacement pumps which are driven by a cam that such that the rates of displacement of the displaceable members of the positive displacement pumps is a constant positive value. This insures that the pumping apparatus provides a constant flow of the treatment chemical being injected into a flowing stream. Providing a uniform concentration of a treatment chemical in a flowing stream maximizes the benefit of the treatment chemical.

Abstract: A method for providing a continuous injection of a constant amount of a desired treatment chemical into a flowing stream is described. This method insures that the concentration of the desired treatment chemical is maintained at a relatively uniform concentration throughout the flowing stream. A constant flow pumping apparatus for providing the continuous injection of the treatment chemical is also described. The pumping apparatus includes multiple positive displacement pumps which are driven by a cam such that the rates of displacement of the displaceable members of the positive displacement pumps is a constant positive value. This insures that the pumping apparatus provides a constant flow of the treatment chemical being injected into a flowing stream. Providing a uniform concentration of a treatment chemical in a flowing stream maximizes the benefit of the treatment chemical.

Abstract: Apparatus for determining the corrosion rate of petroleum distillation equipment so that corrosion inhibitors may be effectively utilized to control corrosion. The apparatus includes a water box having a coil arranged in the box through which hydrocarbon vapors are directed. Cooling water is forced through the box in a counterflow direction to cool the vapors and simulate cooling that will take place in heat exchange units. Corrosion and temperature probes are arranged along the coil to determine corrosion rates at the various temperature levels of the hydrocarbons so that a corrosion profile can be established and related to the temperature of the vapors at various locations in the heat exchange units of the equipment.