• An injector has one or more spray nozzles on a pipe and delivers a specific volume of fluid at a specified pressure drop. See Figure 1. The nozzle(s) convert fluid into a predictable drop size spectrum and provide specific spray characteristics. The use of spray nozzles allows more control over the distribution of the injected liquid into the receiving process fluid.

• A quill is a pipe with slots or holes. See Figure 2. The injected fluid flow is uninhibited. The receiving process stream breaks up and mixes the injected fluid.