Graphite Heat
Exchangers
Our graphite heat exchanger offer an excellent (price)competitive solution with very high and constant quality. The dimensions comply with the specified standards for each particular diameter and pressure class and are therefore easily for replacement of graphite heat exchangers from competitors. Furthermore, the versatile design makes these units ideal for a wide range of services: cooler, heater, condenser, reboiler, falling film absorber and evaporators.
Graphite Block Heat Exchangers (Graphec® RB and SB)
There are two models of such a kind of unit:
Graphec® RB (cylindrical blocks)
Graphec® SB (prismatic blocks)
The blocks are available in materials:
Graphec® iSP (fine-grained, max 200 °C)
Graphec® ILP (ultra-fine grit, max 220 °C)
Graphec xLP (with special impregnation, up to 430 °C).
Technical Specifications
- Diameter and type of holes
- Drilling path
- Number of blocks and passes
- Accurate design and faultless construction ensures a longer lifetime.
- Up to 900 m2 of exchange surface.
- Many combinations of materials and coatings.Many combinations of materials and coatings.
- Accessories, like inpingement plate, blocks sacrifice anti-erosion, overflow crowns, make the Graphec® RB and Graphec® SB block heat exchangers suitable for many specific services.
Graphite Shell & Tube Heat Exchangers (Graphec® ST)
Shell & tubes, block type and plates heat exchangers can be made of graphite, exotic metals or silicon carbide. We make available a wide range of competences related to heat transfer to identify the best possible solution. Construction material selection, geometry identification, set up of the useful accessories, optimal thermal sizing, safe mechanical calculation, advanced manufacturing system and a full set of international certifications: every step of heat exchangers production is carried out to minimize the total cost of ownership for our customers. Graphec®: heat transfer among corrosive fluids.
Graphec® ST are composed by graphite tube bundle fitted in a metallic cylindrical shell. Graphite S&T heat exchangers ensure complete and safe segregation between service side and process side, due to lack of gaskets or welding between tubesheets and tubes, which are joined by thermal cementing. The tubesheets are the most critical components of the heat exchangers since they are continuously under stress during operations. The bundle is a unique monolithic piece, resistant to thermal shock, fully cleanable and easy to run.
Technical Specifications
- Graphec® ST covers almost all common heat exchanger process needs:
- Exchange Area: 0.35 m2 up to >1000 m2
- Maximum Pressure: 20 barg
- Maximum Temperature : 220 °C
Maintenance and Operation
Fully cleanable, so they can be used in very dirty applications, like phosphoric acid. Header can be disconnected to have direct access to the bundle and perform easy and quick repair. Replacement of tubes can be done in short time,
Product Benefits
Corrosion
Resistance
High Thermal
Conductivity
Cost Efficiency in
Corrosive Duty
Good Thermal Shock
Resistance
Non-metallic Material
Benefits
Lower Maintenance
Requirements
Frequently Asked Questions (FAQ)
Graphite heat exchangers and silicon carbide (SiC) heat exchangers are both used in corrosive chemical environments, but they differ significantly in material properties, performance, durability, and cost.
| Feature | Graphite | Silicon Carbide (SiC) |
|---|---|---|
| Corrosion resistance | Excellent (non-oxidizing acids) | Excellent (including oxidizing acids) |
| Oxidizer tolerance | Low | Very high |
| Thermal conductivity | Higher | High |
| Mechanical strength | Low | Very high |
| Pressure capability | Low | High |
| Temperature capability | Moderate | Very high |
| Cost | Lower | Higher |
| Typical use | HCl, phosphoric acid | HNO₃, hot H₂SO₄, high-purity processes |