Hydraulic signal
ISA 5.1-2009/2022 (instrument line symbols)
Drawn as
A thin line with small "L" marks at intervals.
Meaning
Hydraulic signal or power: wellhead control panel to SSV and SCSSV actuators, HPU lines. Not modelled, but it identifies hydraulic actuators.
Variants
- Hydraulic supply lines may also be drawn as process lines with the HYD service code
Not physical hardware. Read it, then skip it in the 3D model.