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Abstract
This document presents guidelines for high vacuum (HV) components for X ray beam experiments at the European XFEL facility. HV is vacuum in the pressure range of $10^{-3}$ to $10^{-7}$ mbar. The effective and reliable operation of the European XFEL X-ray experiment instrumentation is related to obtaining and keeping HV conditions. These guidelines for HV components at the European XFEL contain rules and important information on the design, manufacturing, cleaning, handling, and acceptance-testing of HV components to be installed in the European XFEL vacuum systems. Deviations from these guidelines must be clarified and accepted in advance by European XFEL