www.plastocor-international.com

plastocor/durocor – LIFE EXTENSION SYSTEMS FOR HEAT EXCHANGERS & CONDENSERS PROVIDING COOLING WATER CYCLE CORROSION AND EROSION PROTECTION

Since 1963, plastocor^® and later also durocor^® systems have successfully repaired and prophylactically protected thousands of heat exchangers and condensers from corrosion and erosion, thus preventing their owners from spending huge sums for replacement and shutdown costs. plastocor-international SA specialises in protective coatings for complete cooling water cycles, especially tubes and tube sheets in heat exchangers, turbine condensers, including tube linings and tube inlet coatings, pipelines, spent fuel tanks etc.

TUBE SHEET CLADDING 2000

The Epoxy Cladding System 2000 for tube sheets provides long-term protection for new and already-corroded tube sheets against galvanic corrosion and erosion.

Thin film tube sheet coatings (less than 1mm) are subject to mechanical and substrate deterioration because of long-term permeation. Therefore the Epoxy Cladding System 2000 was developed to completely cover the tube sheet and encapsulate the tube ends into an epoxy layer of 3mm to 5mm thickness.

In severe cases, it can be applied at a thickness of 10mm or more.

CONDENSER AND HEAT EXCHANGER TUBE-END INLET COATING

Since the 1970s over 2 million tube inlet and outlet ends have been coated. As an example, EDF recently reported in the internal weekly magazine of CNPE Cruas that within one year of operating with the plastocor^®/durocor^® inlet system in one unit at least 39 shutdowns were avoided, thus creating an additional € 1.18 million in operational profit for an expenditure of only € 120,000.

The tube-end inlet coating creates a feathered termination inside the tubes, eliminating the chance of step-erosion, a common problem with the use of plastic or metal inserts. This method can actually bridge small perforations of the tube wall, thereby repairing the tube and returning it to service. The need to retune is thus postponed or eliminated. The joining of the tube sheet cladding with the inlet coating creates a uniform and smooth transition from waterbox to tube interior. This reduces fouling and turbulence, which raises flow rate efficiencies. The tube ID is not significantly reduced which permits the unrestricted use of eddy current testing and most tube cleaning methods. The tube-end inlet coating system can indefinitely protect condenser tubes against inlet and outlet end erosion.

CONDENSER AND HEAT EXCHANGER EPOXY TUBE LINING SYSTEM

The heat transfer rate as well as the integrity of condenser and heat exchanger tubes will deteriorate with time because of fouling, corrosion and/or erosion, eventually making retubing necessary. Retubing, however, is highly time consuming and costly. Consequently, the internal coating of tubes is an attractive alternative to upgrade the efficiency and lifespan of condensers and heat exchangers.

Epoxy tube lining systems allow a layer of protective coating to be applied down the entire length of the inner tube surfaces on site within a short period of time. Tubes with a total length of up to 16m and an inside diameter starting from 16mm can be coated on site.

MAIN ADVANTAGES OF TUBE INLET COATING/INTERNAL TUBE LINING:

• Faster completion time compared to retubing
• Significant reduction of investment costs, i.e. up to 90%
• Shorter planning and lead time
• Most economic and fastest life extension of condensers and heat exchangers
• Enhances conformity with today's stricter environmental norms and regulations by preventing the discharge of copper and zinc ions into the cooling water, thus eliminating the need for excessive chemical water treatment

All materials used in plastocor-international's application systems are 100% solids non-VOC materials.

plastocor-international SA
Avenue General Guisan 5
CH 3960 Sierre
Switzerland

Tel: +41 27 456 49 55
Fax: +41 27 456 58 55
Email: info@plastocor-international.com
Web: www.plastocor-international.com