A Method of Preparing a System for a Maintenance Operation
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United States of America Patent
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Issued Date -
Jun 27, 2024
app pub date -
Apr 4, 2022
filing date -
Apr 16, 2021
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Abstract
A method of preparing a system for a maintenance operation having first subsystem, a second subsystem, and a third subsystem separated by sealing blocks. To reduce the hazard risk, the step of removing gas from the second subsystem via a bleed conduit includes applying the sub-atmospheric pressure using a venturi-pump into which an anoxic gas to drive said venturi-pump is introduced to mix with and remove gas from the second subsystem, said venturi-pump having a maximum venturi ratio Mvr.
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