LAr Dewar Condensing Coils at D0

Technical Report · Tue Dec 05 04:00:00 EST 1989

DOI:https://doi.org/10.2172/1031859· OSTI ID:1031859

Michael, J.; Clark, D.

These internal coils are used to condense and cool the gaseous argon contained in the LAr storage dewar at D0, at a rate not to exceed 40KW. The coolant is LN{sub 2}, piped in from another, similar, dewar of 36-feet higher elevation (see Diagram A). The specific design of the coils are outlined in Process Engineering drawing C-32545, attached. The material components are as follows. The internal coil piping material is constructed of 165-feet of 1 1/2-inch NPS schedule 40 pipe, of type 5083 aluminum. 3-inch NPS schedule 80 type 5086 aluminum pipe is used for the headers of the triple hairpin coil welded assembly. The coils are supported by a series of aluminum brackets fixed to the roof of the dewar. Note 35 on the drawing points out the brackets which hold the coils to the roof of the dewar. They are not connected in any way to the coils, and act only as supports. This feature allows for contraction of the coils, and avoids any longitudinal thermal contraction stresses at the vessel nozzles that might have occurred. A stress analysis of the internal coil feed lines is outlined in DO engineering note 239. The analysis shows that the stresses experienced by the nodes where the coil feed lines pierce the inner vessel are on the order of one fifth of the stresses allowable for this design. The coils have been pressure tested at Process Engineering at 200 psi, which is above the accepted percentage for pressure tests of vessels of 125% of maximum allowable working pressure. The maximum pressure which could theoretically develop in the condenser coil is 150psi. Anything above this pressure will vent through PSV614N, set at 150psi. In addition, the coils have been satisfactorily leak checked at PEI and at Fermilab.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: DOE Office of Science
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1031859
• Report Number(s): FERMILAB-D0-EN-234
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALUMINIUM
ARGON
CONTRACTION
COOLANTS
DESIGN
DEWARS
ENGINEERING DRAWINGS
Experiment-HEP
FERMILAB
NOZZLES
ROOFS
SCHEDULES
STORAGE
STRESS ANALYSIS
STRESSES