Injection quill / point

ISO 10628-2 (groups 24-25, fittings and piping) / PIP PIC001 / company legend practice

Drawn as

A small branch entering the pipe (often after a check valve), with its end bent inside the pipe and pointing downstream.

Meaning

Chemical injection point: corrosion inhibitor, scale inhibitor, methanol, demulsifier, biocide. The supply comes from the chemical injection package. Listed, not modelled; the package is chemical-injection-skid.

Variants

Often drawn just as a small line ending in a dot or an arrow on the main line, with the chemical name
A check valve and a double block on the branch are typical