Dissolving Tank Agitators 2
||DISSOLVING TANK AGITATORS|
||Chesterton 1400 & 1730|
|Previous Packing Style:
||1 x 1730x 2 x 1400 x L/R x 2 x 1400 x 1730|
||Docherty Associates Technician|
||18th October 1999|
Excessive leakage was being experienced and large amounts of flush water were being consumed to ensure the packing set would last for the entire year.
This also ensured that green liquor would not leak from the gland.
To Reduce Gland Seal Water, Eliminate Sleeve Wear and to provide a Packing Set that would not require replacement between Boiler Surveys.
The Chesterton Technicians installed style 1400 with 1730 end rings on the 18th of October 1999. The 1400, 1730 combination Packing set was installed on the existing wear sleeves.Four Dissolving Tanks agitators were repacked on a Total Mill Shutdown.
The first ring of Packing installed was Chesterton Style 1730.This ring was located and firmly seated with the aid of a Chesterton Packing Tamping Tool.
Following this 2 rings of Style 1400 were added. The new Doxeal Lantern Ring Material was used to replace the previous lantern rings. A further two rings of Style 1400 were then added. These rings were located in the same manner as the first rings installed to ensure they were firmly and squarely seated. The packing ring joins were staggered at 90 degrees.
The gland follower was installed and the Packing Set was pulled up evenly until the gland nuts became very tight.
The Packing Set was then left in this position for fifteen minutes to die-form the packing set. Then the gland follower was removed.
The final ring of Chesterton 1730 was then installed and the gland follower refitted. The gland nuts were tightened to a full turn past finger tight.
The Chesterton combination Packing Set has reduced the Seal Water required dramatically and has almost completely reduced gland leakage. This sealing method has also provided 6 months without gland adjustment.
Four agitators were completed, one agitator leaked a small amount on start up, and this agitator had been recorded as having a shaft that was not concentric to the gland. It had been noted and recorded that the shaft had dropped and that the packing when installed was very loose at the top and extremely tight at the bottom.
This agitator is still performing better than the previous sealing method, with the gland water reduced and very little visible gland leakage.
None of the three other agitators have required any gland adjustment in that time.