Before start of the work, construction supervisor and pre-commissioning supervisor jointly check and confirm that the precautions/measures are provided and observed as per the “Permit to Work”.
During the check, special attention shall be paid that valve position (open/close), and isolation blind are set with caution tags for isolating live systems/lines as per the “Permit of Work”.

Не совсем понимаю фразу "valve position (open/close), and isolation blind are set with caution tags " и до конца.
Предупредительные ярлыки должны быть прикреплены на сами клапаны или где-то еще?

Спасибо большое.