Vacuum Systems Consensus Guideline for Department of Energy Accelerator Laboratories Page: 6 of 14
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Vacuum Guideline Final - 9/9/08
recommendations for, testing, inspection, repair, and maintenance of vacuum piping, vessels,
For connected sections, such as particle accelerator rings, the boundary of the vacuum vessel
extends to the bolted flange or circumferential weld that connects the sections.
This guideline applies to all vacuum vessels except those with a total energy less than 20,000
joules3 (J). This excludes:
1. Any vacuum vessel with a volumetric capacity of less than 7 cubic feet (ft3)
2. Any vessel under external pressure whose product P x V is less than 73 (psi-ft3), where
P is the external differential maximum allowable working pressure (MAWP) in pounds
per square inch (psi) and V is the volumetric capacity in ft3
In addition, this guideline does not apply to any vacuum vessel with a cross-sectional area less
than 28 square inches (in2). (This is equivalent to the cross-section of a 6-inch diameter pipe).
There is no limitation on the length of the vacuum vessel.
Vacuum vessels with thin or brittle vacuum windows require special consideration not
addressed in this guideline; however, windows are likely to be the weakest component of the
vacuum vessel in terms of an implosion hazard.
Any vacuum vessel that cannot be protected against credible failures that result in internal over-
pressurization greater than 15 psig is subject to this guideline.
Note: The position titles used in the following paragraphs are generic.
Authority having jurisdiction (AHJ) - The person or committee identified by the laboratory
director as having the experience and knowledge of pressure/vacuum codes and standards to
make sound judgments with respect to laboratory pressure safety policy
Engineering evaluation - A document prepared by the responsible engineer that
demonstrates that a given system satisfies the requirements of this guideline. The evaluation
provides a basis for independent review of design and installation, as well as a record of the
system design parameters for future system users. The evaluation is expected to address the
topics listed in Appendix A of this guideline.
Independent design professional - A person responsible for independent review of the
design of a vacuum system subject to the requirements of this guideline. This person is normally
appointed by the division manager or other responsible manager and must meet the
qualification requirements defined in Section V.
3 For more discussion of this threshold, see ASME PCC-2-2006 "Standard For The Repair Of Pressure Equipment
And Piping", Article 5.1, Appendix II, "Stored Energy Calculations for Pneumatic Pressure Test", and Article 5.1,
Appendix Ill, "Safe Distance Calculations for Pneumatic Pressure Test". Additional information is also available in
Los Alamos National Laboratory. Laboratory Implementation Requirement (LIR) 402-1200-01.0, Pressure, Vacuum,
and Cryogenic Systems, October 1, 1999. Los Alamos National Laboratory.
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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/m1/6/: accessed May 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.