Seals for rotating shafts
contact person
Dennis Kranert
Area Sales Manager
+49 (0) 3925/288-164
When limited installation space restricts the use of new sealing systems
Initial situation
Technical challenge
The new seal had to adapt completely to the existing geometry. No modification of the system was planned.
This shifted the technical focus to the design of the seal itself. The solution had to be designed to function within the existing constraints.
Solution approach
A customized version of the SDF seal was developed for this application. The key factor was adapting the design to the installation conditions.
By combining a split housing, an enlarged outer diameter, and an integrated bearing housing, the seal could be designed to utilize the available installation space while also being integrated into the existing system.
Figure 1: Structure of the STASSKOL SDF Series
Implementation
The necessary components were manufactured and subsequently integrated into the existing conveyor system. Installation was carried out without any fundamental changes to the system. The design adaptation made it possible to fully integrate the new seal into the existing system.
Results
Following the retrofit, the seal was monitored in operation over a period of twelve months.
The results showed:
- no measurable wear on the internal parts after 12 months
- successful integration into the existing system
- a technical solution for a previously limiting installation situation
Figure 2 Left: Conveyor screw in installed condition
Figure 3 Center: Stuffing box packing with bearing unit
Figure 4 Right: Integration of the SDF seal in the stuffing box area
Transferability
The approach shown is particularly relevant for applications where existing systems are to continue to be used and design constraints must be taken into account.
Especially in bulk material processing, where installation situations are often predetermined, adapting the seal can be an alternative to modifying the system.
What does your installation situation look like?
Not every sealing system is a standard case. We assess your existing setup and evaluate whether a retrofit makes sense — both technically and economically.
FAQs
If the available installation space is insufficient, the seal is custom-designed. In the case shown, an SDF seal was designed so that it could be integrated into the existing screw conveyor – without modifying the system.
The installation space of the existing gland packing was too small for a standard SDF seal. Therefore, a customized sealing solution was necessary that adapts to the existing installation conditions.
During a retrofit, the existing seal is replaced without fundamentally altering the conveying technology. The goal is to integrate a technically suitable solution and avoid downtime and retrofitting costs.
The solution is based on a split seal housing with an enlarged outer diameter. This allowed the existing installation space to be utilized optimally and the seal to be integrated into the existing system.
The integrated bearing housing makes it possible to relocate additional functions directly into the seal. This allows the existing installation space to be used efficiently without having to add further components.
No. The case study originates from the glass industry (soda and potash conveying), but is applicable to many applications involving screw conveyors—particularly wherever limited installation space and existing equipment must be taken into account.
