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Choosing the right approach to water tower maintenance maximizes budgets and service life.
A vintage water tank, approximately 2 million gallon capacity, survives from the 1960’s into the 21st century to find its roof collapsing due to an inadequate paint job. A structural assessment and root cause analysis are made.
New methods for monitoring scale and corrosion inhibiting water treatment programs have been developed. These new patented methods utilize the measurement of system consumption of actives in the treatment program by fluorescence analysis.'-' The applied dosage of treatment program and the amount of actives available to the system are measured with inert fluorescent tracers added to the treatments.
System consumption of actives is defined as the difference between the amount of actives added and remaining in the system. 2,5- 7 Consumption measurements determine changes in the whole operating system (not a simulated, small portion of the system). Consumption measurements can also be made on individual portions of the system (heat exchangers). Changes in consumption of inhibitors and dispersants can .be related to changes in system operating conditions and performance. Reducing consumption of actives or maintaining consumption within a specified range can be related to optimization of the operation of the cooling system and treatment program.
Current and impending environmental regulations are leading to the development and use of new technologies in a variety of marine and protective coatings applications. Among the various challenges presented to the coatings industry, the desire to decrease the level of volatile organic compounds (VOCs) in traditional solventborne coatings ranks among the most prevalent.
This presentation briefly updates a two-part article printed in Water Engineering & Management in 2001. It begins with the benefits of waterborne coatings and gives examples of where they may be used.
Concrete and other cementitious surfaces are porous materials that will allow water and soluble contaminants to penetrate the structure leading to degradation. The effects of degradation can include efflorescence, laitance and physical defects such as cracking and spalling. Waterproofing concrete can protect it from freeze/thaw cycles, increase chemical resistance, and provide protection to imbedded reinforcing steel.
The Federal Highway Administration has a top-level technology goal targeted toward the development and deployment of the “Bridge of the Future.” This is a conceptual short span bridge that demonstrates significant improvements over the current state of the practice – particularly with regard to ease and speed of construction and long-term durability.
Boiler system is one of the most critical systems for a utility plant. A utility plant had experienced high percentages of boiler downtime owing to boiler tube sheet cracking failures. Investigations carried out revealed high stress at the tube-to-tube sheet joint in the boiler fire-side entrance. Tube-to-tube sheet joints at the boiler fire-side entrance had been fabricated by strength welding and without any expansion. The strength welded joint had created undue stress leading to cracking of the weld joint by thermal expansion. A higher quality expanded joint consisting of expanding, flaring and seal welding the fire-side entrance was implemented during the re-tube process. The utility plant has now zero downtime due to boiler tube failure. This article summarizes the description and history of failures with the boiler at the utility plant; investigations and corrective actions carried out; and the present improved condition of the boilers.