HYBRID DOUBLE CONTAINMENT SHELL
MAXIMALE SICHERHEIT
without Compromising Performance
Pumping aggressive, explosive and highly toxic liquids requires the highest level of process safety. To protect people and the environment, leakage of the pumped liquid must be avoided – including in the event of a pump failure. For these most critical applications a magnetic drive pump equipped with a monitored, double containment shell still remains the safest solution. To reduce the heat generated by a purely metallic, double containment shell and at the same time to improve the overall efficiency of the pump, Klaus Union has developed and patented a new hybrid double containment shell.
ADVANTAGES
of the hybrid double containment shell
- Reduced heat input into the pumped process liquid
- Increased reliability when pumping liquids close to their boiling point
- Increased reliability when pumping liquids close to their boiling point
- Higher efficiency leading to power savings
- Wider application range than full metal, double containment shells
- Fully compliant with requirements for secondary containment system as defined by API 685, 3rd Edition, § 3.1.71
- Primary and secondary containment integrity is constantly verified by the pressure transmitter
- Easy and reliable detection of containment breach through a standard pressure transmitter
- High spare parts availability by using of standard Klaus Union components
- Ability to flush the area between shells (according API 685, 3rd Edition, § 6.7.9)
- Available across entire Klaus Union mag-drive pump range
- Reliable and maintenance friendly construction
Application Coverage
Nom. Pressure Range: max. PN 63Temperature Range: -60 °C to +400 °CMax. up to 1 MW
Sealless Technology
The hybrid double containment shell combines two separate shells. The inner shell is a highly corrosion resistant metallic containment shell while the outer, secondary shell is a non-metallic containment shell made from heavy duty technical ceramics. The increased electrical resistance of the materials used in this hybrid design reduces the eddy
current losses. It improves the efficiency of the pump putting it about on par to traditional metallic, single containment shells. Moreover the risk of vaporization, especially when pumping media close to the boiling point or under other critical operating conditions, is significantly reduced.
The gap between both shells is provided with a vacuum and can be monitored with a standard pressure sensor; typically a pressure transmitter following customer instrumentation standards. In the event of damage to either containment shell the sensor immediately detects the change in pressure and alerts the operator, identifying which shell has been breached. This immediate and detailed information allows the operator to take any necessary steps to avoid any leakage of the dangerous pumped liquid to the atmosphere.
The patented hybrid double containment shell design substantially increases safety and reliability for operators in all kinds of industries reducing operation costs for the most critical applications where leakage is not an option – ever.
Advantages
of Ceramic Containment Shells
Containment Shells made of Zirconium Oxid are not magnetizable. Due to this quality there are no eddy currents impacting the pump‘s performance. In consequence, the pumping fluid is not being heated in the process. In consequence, the pumping fluid is not beeing heated in the process.
This has the following advantages:
- Enables for dry run capable executions (RTZ-design) and executions without flush flow to cool the containment shell (OTZ-design).
- Enables for applications with high gas content.
- Pumps can handle fluids close to vapor pressure curve, e.g. liquid gas applications.
Further advantages:
- High mechanical strength; Extension of the application through higher pump speed.
- Vacuum tight up to 0 bar absolute.
- Large corrosion and erosion allowance; Zirconium Oxide is resistant against most lyes and acids.
- Excellent thermal shock resistance.
- Enhanced energy efficiency.
Retrofit of pumps with shaft seal:
- As there are no eddy current losses, shaft powers comparable to pumps with shaft seals can be achieved.
For quality control purposes, all Klaus Union containment shells are equipped with an individual, engraved serial number. Furthermore, Klaus Union provides material certificates on request.
Cost Savings
through the Application of Zirconium Oxid
- Ceramic containment shells are an important part of Klaus Union‘s modular pump system. Due to the universal casing cover containment shells can be easily and savely mounted or replaced. The operator saves stock capacities and service costs.
- Energy consumption can be lowered as there are no performance-impairing eddy currents. In fact, the required motor power can be reduced by 10 to 15 %.
- Due to the lower power requirement, smaller electric motors can be installed.
- The ceramic containment shell per se guarantees an absolute leak-free operation. In conjunction with the high durability of the material, both the risk and the maintenance costs are minimized.
