Tag
#isolation
3 topics across all disciplines.
Valve types — picking one for the duty, not the drawing
Gate, globe, ball, butterfly and check valves explained by what each is built to do. Why throttling with a gate valve destroys it, what double block and bleed means, and how check valves slam.
Energy isolation and lock-out — proving dead, not assuming it
Why a closed valve is not an isolation, what a personal lock actually protects, the energies people forget because they are not electrical, and why the return to service kills as often as the isolation does.
Permit to work — how a plant decides a job is safe to start
What a permit actually is and what it is not, why proving an isolation matters more than making one, why confined spaces kill rescuers, and the ways a permit system quietly becomes paperwork.