1. Overview

During Ballasting, the AFU(Auto Filter Unit) automatically activates Backflushing if the Filter Element becomes clogged.

📌 Issue:

• If the Teflon Nozzle inside the AFU is worn out, it may fail to make proper contact with the Filter Element.
• This may cause Backflushing to malfunction, leading to persistent filter clogging.

📌 Solution:

• Regularly inspect the Teflon Nozzle for wear and replace it if necessary.
• Follow the procedure below for inspection and replacement.

2. Teflon Nozzle Wear Inspection

1. Remove the Suction Unit from the AFU.
2. Check the wear condition of the Teflon Nozzle:
   • The yellow line in the reference image marks the surface in contact with the Filter Element.
   • The height between the yellow line and the red line is 38.5 mm.
     
3. Replacement Recommendation:
   • The Teflon Nozzle is a consumable part.
   • If the nozzle is too worn to make proper contact with the Filter Element, replacement is required.

📌 Purchasing Replacement Parts:
For orders, contact hanla@hanlaims.com.

3. Teflon Nozzle Replacement Precautions

1. The Suction Unit and Teflon Nozzle are assembled using:
   • Plain Washer
   • Spring
   • Hex Wrench Bolt
2. Before replacing the nozzle:
   • Use a Vernier Caliper to measure the gap between the Suction Unit and the Teflon Nozzle.
   • Reassemble the new nozzle with the same gap measurement.
   • The standard gap is generally 6 mm or 7.46 mm, but it may vary depending on the vessel's design and operating conditions.
     

📌 Why?
Maintaining the same gap ensures optimal Backflushing performance.

4. Summary of Key Actions