For removing dirt and debris from a flowing fluid stream, which device is used upstream to intercept large particles?

Introduction / Context:
Process lines often need protection from debris to prevent fouling or damage to downstream equipment like pumps, valves, and exchangers. A strainer provides a simple mechanical barrier.

Given Data / Assumptions:

• Dirt = relatively coarse solids carried in a liquid stream.
• Objective = quick removal with minimal complexity.

Concept / Approach:
Strainers are coarse filters (baskets, Y-strainers) that intercept larger particles. Coagulants aid in fine-particle agglomeration for sedimentation, not immediate debris interception. Gravity settlers and clarifiers are unit processes for bulk solids separation, not simple inline protection devices.

Step-by-Step Solution:
Match need (inline debris removal) with solution (strainer).Reject chemical/coarse clarification options.

Verification / Alternative check:
Plant P&IDs commonly place strainers upstream of pumps and control valves.

Why Other Options Are Wrong:
Coagulant: chemical aid, not a device.Settler/Clarifier: large equipment for bulk removal; not inline dirt interception.

Common Pitfalls:
Confusing strainers with fine filtration cartridges; strainers are coarse protection devices.

Final Answer:
Strainer (mechanical screen)