Question

The closure of a pipe, line or duct by closing and locking or tagging two in-line valves and by opening and locking or tagging a drain or vent valve in the line between the two closed valves is called _______________.

Option 1. Line isolation
Option 2. Double lockout
Option 3. Blanking
Option 4. Pipe closure

Answer 1

The procedure of closing and locking or tagging two in-line valves with a drain or vent valve opened in between is known as line isolation.

Step-by-step explanation:

The process you are referring to is known as line isolation. It is a safety procedure used in various industries such as plumbing, heating, and cooling, as well as in oil and gas operations, where it is critical to ensure that no hazardous fluids or gases pass through a section of piping while maintenance or repairs are being performed. To perform a line isolation, two in-line valves are closed, locked, or tagged, and a drain or vent valve in the line between the two closed valves is also opened and locked or tagged. This effectively isolates the section of the pipe and prevents the passage of materials between the two closed valves.