Injection points are locations where water, steam, chemicals or process additives are introduced into a process stream at relatively low flow/volume rates as compared to the flow/volume rate of the parent stream.
- NOTE: Corrosion inhibitors, neutralizers, process anti-foulants, de-salter demulsifiers, oxygen scavengers, caustic, and water washes are most often recognized as requiring special attention in designing the point of injection. Process additives, chemicals and water are injected into process streams in order to achieve specific process objectives. Injection points do not include locations where two process streams join (see 3.1.60, mixing points).
- EXAMPLE: Chlorinating agents in reformers, water injection in overhead systems, polysulfide injection in catalytic cracking wet gas, antifoam injections, inhibitors, and neutralizers.
Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global Standards