Survey, troubleshooting

The simple checks need to be made first. These include column liquid level, temperature profile, pressure profile and stream flow rates. In addition, a Delta-P. survey using test gauges should be made in the field and if not by the troubleshooter then under his direct supervision. Just... 

Such a survey becomes a combination of an annual inspection and a troubleshooting exercise. The fact is that operating practices change with time the production process may be adjusted or new sections of cooling systems are added to the main plant, or pumps, heat exchangers, and other items of equipment are periodically replaced. The personnel also change. 

A recent survey (27) touched on several other applications AIWARE has built a system which troubleshoots grinding operations in a factory Global Holonetics LIGHTWARE performs quality control on an assembly line Widrow has developed a neural network which eliminates echoes in telephone lines, and is used in modems and other signaling devices Carleton University s Neuroplanner is a set of networks which enables a robot to navigate its workspace. 

Cathodic protection troubleshooting Leak survey and classification Emergency plans and public relations Odorization Pipeline leak repair... 

Literature surveys, field consultation, and troubleshooting, along with a great deal of proof testing, empirical observation, and hypothesis testing, have led us to believe the following ... 

While X-ray pictures of tower internals easily detect most types of tray damage, this can be a cumbersome and expensive troubleshooting procedure. A simpler way to obtain almost the same information is by a pressure survey. Tower pressure drops of less than 1 in. of water per tray typically indicate tray damage, assuming a tray spacing of 24 in. 

FIGURE 13-3 Pressure survey is key to troubleshooting high Hash-zone pressure. 

The key tool in troubleshooting flash-zone pressure problems is a vacuum-tower pressure survey. The time to initiate this survey is just after start-up when the trays, demister, and ejector system are clean and in good condition. Pressures are best measured with a portable mercury-filled vacuum manometer. Using a vacuum pressure gauge will reduce the accuracy of observed pressure drops. Relying on permanently installed gauges for pressure drop data will not give reliable results. 

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