How to extend the service life of your graphite heat exchanger?
Drawing on his field experience, Nicolas Floquet, Service Center Manager at Mersen’s Pagny-sur-Moselle facility, shares key recommendations to help operators maximize the performance and longevity of their graphite heat exchangers.
Service life
How can you avoid premature failures of a graphite heat exchanger?
Mersen, a leader in the design, manufacture, and maintenance of graphite heat exchangers for corrosive chemical applications, explains how to maximize the service life of these heat exchangers.
From proper operating practices to preventive maintenance, these practical tips can help ensure reliable operation for decades.
Material
Graphite, a material that is particularly resistant to corrosion
In many chemical applications, it is precisely this resistance that makes it the material of choice for heat exchangers, especially when the fluids in contact are highly corrosive.
However, like any industrial material, its service life depends heavily on how the unit is operated.
A properly sized graphite heat exchanger, used within its intended operating ranges and maintained regularly, can remain in service for many, many years.
The key points
-
Preventive maintenance
Early detection and resolution of potential issues, thus preventing them from escalating into major problems -
Monitoring Performance
Track key operating parameters to identify deviations before they impact reliability. -
Operating within design limits
Respect design limits, adhering to operating conditions
Operating conditions
Harsh chemical environment
It is essential to avoid sudden fluctuations in temperature or pressure, which can cause thermal or mechanical shock, but also to prevent the heat exchanger from becoming fouled. The sooner the heat exchanger is cleaned, the easier it is to carry out the work, and, above all, the lower the risk of the heat exchanger breaking.
Under optimal conditions, some heat exchangers operate for more than 40 years without any particular issues, while maintaining very high levels of thermal performance. There is no loss of performance over time unless the unit becomes fouled; however, in such cases, this is not related to the material itself.
In such cases, the graphite does not degrade: it continues to perform its functions of heat transfer and chemical resistance.
Conversely, a unit subjected to unsuitable operating conditions may show signs of fatigue much more quickly, sometimes after only a few months.
This is generally not due to the graphite itself, but rather to the stresses placed on the equipment:
- too rapid startups,
- significant thermal gradients,
- pressure surges (water hammer),
- maintenance issues,
- or use outside of the intended conditions.
It is therefore important to distinguish between the material’s theoretical service life and the actual service life of the equipment.
Graphite can have a very long service life when used correctly, but the service life of the entire unit also depends on its operating environment, operating cycles, the quality of its installation, the extent of fouling, and the thoroughness of its maintenance.
Nicolas Floquet
Service Center Manager, Pagny-sur-Moselle, France
In summary, there is no single service life that applies to all units. A graphite heat exchanger that is used and maintained properly can operate for several decades.
The key is to adhere to operating conditions, perform preventive inspections, and avoid thermal or mechanical shocks that can weaken the equipment. A build-up of dirt on the heat exchanger is the first warning sign that maintenance is required.
Contact
Need support with your graphite heat exchanger?
Whether you need preventive maintenance, performance assessment, or service support, Mersen's specialists are here to help. Get in touch with our team to find the right solution for your operation.
Products
Related Products
News
Related news
