QuestionFebruary 1, 2026

Select the choice that best completes the following statement. The safest form of isolation method is: a) Single block valve and line blank b) Double block valve and controlled bleed c) Engineered process plugs d) Control valves

Select the choice that best completes the following statement. The safest form of isolation method is: a) Single block valve and line blank b) Double block valve and controlled bleed c) Engineered process plugs d) Control valves
Select the choice that best completes the following statement. The safest form of isolation method is: a) Single block valve and line blank b) Double block valve and controlled bleed c) Engineered process plugs d) Control valves

Solution
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Answer

a) Single block valve and line blank Explanation 1. Identify safest isolation practice The safest isolation in process safety is achieved by physically blocking the flow and ensuring complete isolation; physical methods like line blanks provide zero-leak possibility. 2. Evaluate given options Among listed, **single block valve and line blank** is the most secure because the line blank is a physical barrier with no reliance on valve sealing alone.

Explanation

1. Identify safest isolation practice <br /> The safest isolation in process safety is achieved by physically blocking the flow and ensuring complete isolation; physical methods like line blanks provide zero-leak possibility. <br />2. Evaluate given options <br /> Among listed, **single block valve and line blank** is the most secure because the line blank is a physical barrier with no reliance on valve sealing alone.
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