You are currently viewing Important Facts: Quiz on Heat Exchangers Access for Operation and Maintenance II 7 MCQs with Explanations

Important Facts: Quiz on Heat Exchangers Access for Operation and Maintenance II 7 MCQs with Explanations

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Access for Operation and Maintenance Quiz

1. Horizontal Clearance: Heat Exchangers Access

What is the recommended minimum horizontal clearance while planning Heat Exchangers Access between exchanger flanges or between exchanger flanges and piping?





2. Channel End Orientation

How should the channel ends of heat exchangers be positioned to facilitate tube bundle removal?





3. Access for Tube Bundle Removal

What is the recommended clearance for tube bundle removal access?





4. Mobile Equipment for Handling Tube Bundles and Covers

What is the recommended approach for handling tube bundles and covers at grade level?





5. Tube-Bundle Extractor

What is the function of a tube-bundle extractor in the context of maintenance?





6. Platform Arrangements for Air-Cooled Exchangers

What considerations should be taken into account when designing platform arrangements for air-cooled exchangers?





7. Easily Removable Spool Pieces, Flanged Elbows, Break Flanges, and Short Pipe Runs

Why is it recommended to incorporate easily removable spool pieces, flanged elbows, break flanges, or short pipe runs in the design?





Short Article on Heat Exchangers Access for Operation and Maintenance

Access for Operation and Maintenance

Horizontal Clearance

  • Maintain a minimum horizontal clearance of 900mm between exchanger flanges or between exchanger flanges and piping.
  • In limited-space scenarios, the clearance between alternate exchangers may be reduced.
  • Ensure that the clearance over insulation between channel flanges is never less than 600mm.

Channel End Orientation

  • Position the channel ends of heat exchangers facing the local access road to facilitate tube bundle removal.
  • Orient the shell cover towards the piperack.
  • Prevent pulled-out bundles from extending over the main access road.
Heat Exchangers Access

Access for Tube Bundle Removal

  • Provide a clearance of 500mm more than the bundle length for tube bundle removal access.

Mobile Equipment for Handling Tube Bundles and Covers

  • Utilize mobile equipment for handling tube bundles and covers at grade level.
  • Minimize the use of expensive built-in facilities such as lifting beams and monorails.

Tube-Bundle Extractor

  • Employ a tube-bundle extractor to eliminate the need for permanent tube bundle removal structures.
  • These compact mechanisms weigh around seven tons and can generate pull forces of approximately 500,000lbs.
  • The tube-bundle is held in position by a crane and balanced by the extractor’s leveling cradle.
  • Hydraulic force is used to pull the tube-bundle out of its shell using pull rod attachments.

Platform Arrangements for Air-Cooled Exchangers

  • Design platform arrangements for air-cooled exchangers to accommodate maintenance access requirements.
  • Consider fin-tube bundle removal, tube rodding out at header boxes, and motor and fan access.

Easily Removable Spool Pieces, Flanged Elbows, Break Flanges, and Short Pipe Runs

  • Incorporate easily removable spool pieces, flanged elbows, break flanges, or short pipe runs to facilitate exchanger maintenance.

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