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Coal tar enamel provides an extremely long service life, under the right conditions. The Bureau of Reclamation (Reclamation) has observed more than 80 years of corrosion protection at facilities such as Hoover Dam. The coal tar enamel linings in penstocks and outlet works that are buried, encased, or in tunnels maintain excellent condition with minor damage. However, when temperature fluctuates between hot and cold, the enamel is stressed and develops alligator cracking.
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Consistent coating inspections and planned maintenance are essential to asset integrity. Non-existent, delayed, and cursory inspections can allow premature coating breakdown, corrosion, and costly failures. On the other hand, improper maintenance can be ineffective, costly, and wasteful. The challenge involved in executing informative inspections and effective maintenance practices is identifying and understanding the numerous conditions that can contribute to a reduction in the lifecycle of an asset. This paper will discuss some of the aspects involved in identifying coating conditions that are likely to result in failures and developing cost effective coating repair strategies that will extend the life of the asset.
Inspection of deaerator system welds. Boiler feedwater deaerator cracking. Design and fabrication of vessels and repair of existing vessels. Operational and water chemistry parameters. Historical Document 1990
Inspection of deaerator system welds. Boiler feedwater deaerator cracking. Design and fabrication of vessels and repair of existing vessels. Operational and water chemistry parameters.
The new epoxy based repair materials offer significant advantages over conventional patching compounds. Ease of use, the ability to conduct large and complex repairs with long-term durability make epoxy based repair materials the choice for today’s painting contractor.