What is the purpose of spacers when an exchanger is blinded?

• A. To space open the exchanger side for steaming or nitrogen purge
• B. To seal leaks
• C. To stop flow
• D. To support insulation

Answer: (A)

When a heat exchanger is blinded, spacers create a clearance on that side so purge media can pass through. This space allows steam or nitrogen to circulate and flush the exchanger interior, removing air, moisture, and residual hydrocarbons before startup. The spacer’s job is not to seal leaks, stop flow, or support insulation; those functions belong to other components. The purge ensures a safer, cleaner condition inside the exchanger before it’s put back into service.