E/EL Pulverizer bottom ring lifting clamp - Case study

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Courtesy of Babcock & Wilcox MEGTEC LLC

Purpose
Alert customers on safety procedures when using the Babcock & Wilcox bottom grinding ring lifting clamp.

Problem
The Babcock&Wilcox lifting clamp is designed only to lift the bottom ring off the ring seating surface of the yoke and to position the ring back on top of the ring seating surface of the yoke, when the bottom ring is completely inside the pulverizer housing (see Figure 1).

We have found that many customers use the lifting clamp to transport the used bottom grinding rings out of the pulverizer and transport new bottom grinding rings into the pulverizer. The possibility exists for the lifting clamp to slip, especially when transporting.

Recommendations:
The lifting clamp should be used in the following manner:

Ring Removal

  1. Grasp the ring with the lifting clamps and lift it just high enough to install wooden blocks between the ring and the ring seating surface of the yoke (see Figure 2).
  2. Lower the ring on to the blocks. (Attach rope to each block for easy removal.)
  3. Remove the lifting clamps.
  4. Wrap chokers around the ring for safe transporting out of the pulverizer.

Ring Installation

  1. Wrap chokers around the ring for safe transporting to and into the pulverizer.
  2. Lower the ring on to the wooden blocks.
  3. Remove chokers and grasp the ring using the lifting clamps.
  4. Remove the wooden blocks and lower the ring into place.
  5. Remove the lifting clamps.

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