PTW - hot work operation card: Permit-to-work, gas-free + stand-by.
Formula
$$ \text{Op} = \text{PTW - hot work} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $PTW - hot work$ | Permit-to-work, gas-free + stand-by | - | IMCA / IOGP |
Sources
- IMCA / IOGP Industry Guidelines.