English to Russian Tech/Engineering Other

Химическое производство

When doing Hot Work on lines or equipment that last contained flammables or combustibles, then the energy sources have been isolated using at least one of the following methods:
Disconnection of the piping to provide an air gap such that no material can enter the equipment or area where the hot work is being performed.
Installation of blinds, *pancakes or spectacles* which are appropriate for the chemical, temperature and pressure of the service.
Double blocks and bleeds.
When using double block and bleeds as an isolation method, then it has been confirmed that the isolating devices are isolating the energy sources and that they are secure from inadvertent operation (for example: the block valves have the handles removed, are closed and are holding and the bleed valve is open, unplugged and not leaking.)