Keterangan :

retractable injection quill are device that deliver chemicals to a desired location inside piping. Generally , quills are used when relatively small amounts of chemicals are being injected. This usually done to assist in a more even dispersal of a chemical, especially in liquid streams. In other words to get maximum benefit from chemical. Retractable injection quills are also used in gaseous streams but unless there is a significant gas velocity the chemical is not adequately dispersed into the gas.