The facilities dedicated to water desalination operate continuously and are part of a strategic sector for the supply and management of an essential resource.
Within these systems, the mechanical seal plays a vital role, and the correct selection of the mechanical seal for a desalination plant directly influences the reliability of the installation, the energy efficiency of the process, and the ability to avoid unplanned shutdowns that can compromise service continuity.
In Lidering we are specialists in sealing systems for the water sector, developing specific solutions for applications such as desalination plants, treatment and purification. This experience in mechanical seals for the water sector allows us to address high-pressure applications and demanding conditions with a technical, process-oriented approach. We’ll tell you about it.
Challenges facing mechanical seals in desalination plants
Desalination plants present especially demanding operating conditions for any sealing system. The pumps operate continuously, at very high pressures and in contact with fluids with high chloride concentrations, which causes the metallic components of the mechanical seal to work in a highly corrosive environment.
What happens if the sealing system has not been chosen correctly for these conditions? Essentially, problems such as the following may arise:
- Leaks of water or treated fluids, with environmental impact.
- Unplanned shutdowns in continuous service facilities.
- Increased energy consumption and loss of efficiency.
- Higher maintenance and repair costs.
- Risks of non-compliance with environmental and service requirements.
What actually happens is that these effects are not usually associated with a single factor, but rather with a combination of several: pressure, fluid composition, unsuitable materials, and a lack of adaptation of the cartridge design to the real application. This is where plant or maintenance managers, or design or development engineers, must know how to choose the best mechanical seal for desalination plants or desalination units for their facility.
Technical criteria for the selection of mechanical seals in desalination plants
In the desalination sector, the mechanical seal should not be considered a standard or interchangeable component. Each application requires a prior analysis that takes into account the pump’s hydraulic conditions, operating regime, working pressure, and the chemical aggressiveness of the fluid. From there, it is necessary to decide which mechanical cartridge and with which specific characteristics of size, material, and resistance works best in each case.
A wrong selection of the seal can directly affect the efficiency of the process and the sustainability of the installation. Conversely, a properly sized sealing system helps reduce leaks, improve operational stability, and ensure service continuity, aspects that are especially relevant in a sector considered strategic.
Materials and design of the mechanical seal for desalination
One of the most critical technical aspects in desalination applications is the resistance of materials to high chloride concentrations. These compounds can attack the metal components of the seal (such as springs, sleeves, or bellows) through pitting corrosion processes that, in the long term, compromise the integrity of the system.
For this reason, mechanical seals used in desalination plants must:
- Corrosion-resistant metallic materials, such as Super Duplex steels or titanium, especially in the metal parts of the seal exposed to the fluid.
- Specific designs for high pressures, capable of maintaining stable performance under demanding operating conditions.
- Solutions that enable reliable operation and continuous performance at all times.
And, as we have mentioned previously, each installation has its own technical and operational requirements, so a universal mechanical seal for desalination plants is not possible; it must be customized.
LSC10B-FQ: single cartridge for high-pressure applications in water treatment
As an example of a solution adapted to this type of application, Lidering offers the LSC10B-FQ, a single cartridge mechanical seal designed in accordance with API 682 standards, to operate under high-pressure conditions and demanding environments such as those found in water treatment and desalination facilities.
This model incorporates connections that allow flushing between the friction faces and a Quench system with non-pressurized fluid for cooling, which helps maintain stable sealing performance in critical applications.
Additionally, its design provides high robustness and reliability, key aspects in continuous operation installations.
The LSC10B-FQ allows axial movement of up to ± 2.0 mm (depending on diameter and installation), facilitating adaptation to the tolerances and dynamics typical of the pumps used in desalination plants.
The impact of mechanical seals on efficiency, sustainability and service continuity
Proper engineering of the mechanical seal has a direct impact on the overall performance of a desalination plant. By reducing leaks and stabilizing pump operation, it contributes to:
- Reduce unplanned shutdowns in critical facilities.
- Achieve lower maintenance costs thanks to the correct selection of the mechanical seal.
- Optimize pump energy consumption by ensuring stable operation.
- Minimize the environmental impact resulting from possible fluid leaks.
- Align operations with sustainability criteria and responsible water use.
- Provide sealing system reliability in a sector considered strategic.
- Deliver solutions aligned with quality standards and environmental requirements.
And if we look at these benefits, we realize that they do not depend solely on the product, but also on the correct selection of the seal and the supplier’s ability to analyze the application and respond quickly to incidents.
Mechanical seal technical service and responsiveness
In a sector such as desalination, where service continuity is essential, it is important to have a supplier with technical experience and decisive response capability. The combination of process knowledge, proper selection of the mechanical cartridge, and technical support is what truly enables rapid action in the face of incidents and minimizes the economic and operational impact of any failure.
At Lidering, we are not only manufacturers of mechanical seals for desalination plants, but we also provide technical support to our customers in an environment where reliability, efficiency and sustainability are top priorities. Contact Lidering’s technical team and we will be happy to advise you.
