August 2001

Special Report: Fluid Flow

Hydro-tapping a 60-inch flue gas duct

Using a high-pressure water jet with abrasive grit met the requirements

Bowling, T., Team Industrial Services, Inc.

A southern refinery began a major modification to its fluid catalytic cracking unit. One modification called for a 60-in. diameter hot tap on a large rectangular duct carrying nitrogen and carbon dioxide at 4 psi and 467°F. Special requirements were met using a unique cutting method to perform the hot tap. Refinery engineers contacted a contractor specializing in high-temperature, high-pressure hot taps, line stops and tapping machine modifications for special applications to discuss feasibility of the project. Parameters included: The duct would have to remain in operation and at full pressure and temperature while the tap was being performed. Metal

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