Meco seals solve contamination and vacuum issues
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Meco Shaft Seals product story
Edited by the Engineeringtalk editorial team
Oct 2, 2008
Meco Shaft Seals has revealed how its Meco-DR shaft seals can solve contamination and vacuum problems in drying applications.
Two challenges encountered by processors who have to dry abrasive slurries are contamination of product by packing flecks and the loss of vacuum leading to longer and longer drying cycles.
The MECO-DR seal is designed to accommodate thermal shaft growth and effectively hold vacuum in a dryer
For most companies, the greater the vacuum, the shorter the batch time and the more profitable the process.
As the product in the dryer is heated, the shaft grows in length.
The dryer also undergoes thermal growth, and the shaft and vessel usually grow at different rates.
This creates a thrust motion of the shaft, which can pull abrasive product into the seal cavity, in a wiping action.
Packing in the stuffing box becomes abraded, and residue from damaged packing can contaminate the process material.
Constant abrasion of packing material can also cause damage to the shaft, and eventual leakage.
As the seal is compromised and atmosphere leaks into the process, the vacuum pump is taxed, requiring greater energy expense to run it.
At the same time, the machine is prevented from holding full vacuum, so it takes more time to achieve the necessary product dryness.
At best, this increases the batch time; at worst, atmospheric air contaminates the product and makes it less saleable - or not saleable at all.
Mechanical seals can usually eliminate the problems related to packing wear, but they are not able to handle the thrust motion which results from thermal growth.
One solution to this problem is Meco's Meco-DR custom shaft seals.
The MECO-DR seal is designed to accommodate thermal shaft growth and effectively hold vacuum in a dryer.
Product is excluded from the seal cavity, so abrasion damage to the shaft is prevented.
Seal faces co-rotate with the shaft, engaging on a plane perpendicular to it.
A low-flow air purge is used to maintain seal face pressure and to provide a monitoring tool to operators, indicating when seal face wear has occurred.
The seals need infrequent rebuilding and split internal rotating parts are quickly replaced.
Users have reported Meco-DR seals holding as little as 2-3 torr of vacuum, resulting in dryer cycle times 20-50 per cent shorter than using their previous seals.
Meco seals are available fully-split, in FDA materials.
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Contact Meco Shaft Seals
Tel +1 207 371 2210
Other Meco Shaft Seals stories
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Meco launches HB standard-sized seals
Meco Shaft Seals has announced the launch of the HB range of standard-sized seals for screw conveyors and similar equipment. -
Meco shaft seals take stand at POWTEX
Meco custom-engineered shaft seals will be on exhibit at the 17th International Powder Technology Exhibition (POWTEX) in Tokyo on 28-31 October 2008. -
Air-purged seals clear caramelised sugar
Unlike traditional mechanical seals, MECO seal faces are soft, fault-tolerant and almost impossible to break. -
Seal upgrades meet ATEX requirements
Meco has adapted two of its seal designs to comply with ATEX, which considers packing glands unsuitable for service in potentially explosive atmospheres -
Shaft seals reduce carbon dust emissions
In several plants carbon dust leakage has been eliminated by replacing packed glands with MECO Custom Shaft Seals.
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