Vacuum Systems Consensus Guideline for Department of Energy Accelerator Laboratories Page: 7 of 14
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Vacuum Guideline Final - 9/9/08
Pressure Safety Committee (PSC) - A committee appointed by the laboratory director or other
responsible manager to provide guidance and oversight to the Laboratory with regard to
pressure safety. Depending on local practices at each institution, the PSC may review new or
modified designs of vacuum/pressure systems subject to this guideline and/or serve as the
authority having jurisdiction for matters of pressure safety for the facility.
Responsible vacuum system design engineer - The person responsible for the engineering
design of a vacuum system. This person must meet the qualification requirements defined in
Section V, and is normally appointed by a responsible manager of the organization accountable
for operation of the vacuum system.
Vacuum system - A system consisting of a vessel and its associated piping and components
evacuated below atmospheric pressure. Guidelines for vacuum vessels are determined
according to the category that describes the vessel:
Category I Vacuum vessels in which the differential operating pressure across the
vacuum boundary can never exceed 15 psi
Category 11 Vacuum vessels that are protected from credible failures that could create
pressurization exceeding 15 psi through the use of engineering controls such
as pressure relief devices
Category Ill Vacuum vessels that are not or cannot be protected from credible failures
that could create pressurization exceeding 15 psi
A responsible manager for the organization designing or operating a vacuum vessel assures
implementation of this guideline. He/she assigns a qualified responsible vacuum system design
engineer to design the vacuum system in accordance with applicable codes and to prepare the
required engineering evaluation. A responsible manager also assures operation and
maintenance of the vacuum system consistent with this guideline throughout the operating
period of the system.
The authority having jurisdiction at an institution is responsible for the official interpretation of
codes, standards, and practices relating to this guideline and the ASME Codes. All issues
regarding interpretation and application of this guideline should be referred to this authority for
The Pressure Safety Committee advises the operating organizations and laboratory director
regarding pressure safety issues associated with all facility operations. In some organizations
the Pressure Safety Committee is responsible for independent review of vacuum/pressure
system design and may serve as the authority having jurisdiction for matters of
Responsible Vacuum System Design Engineer
The responsible vacuum system engineer should possess extensive relevant knowledge,
training, and experience. In addition, the engineer should have successfully demonstrated
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Casey,R.; Haas, E.; Hseuh, H-C.; Kane, S.; Lessard, E.; Sharma, S. et al. Vacuum Systems Consensus Guideline for Department of Energy Accelerator Laboratories, report, September 9, 2008; United States. (https://digital.library.unt.edu/ark:/67531/metadc901857/m1/7/: accessed May 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.