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Critical Flow Restricting Orifices

Description: The installation of flow restricting orifices in both the nitrogen gas and instrument air supply lines in the D-Zero Building limits the flow available to the various users. These orifices are strategically positioned along the lines such that no one user can monopolize the gas supply and deprive others of their flow required to operate. Provided that the necessary orifice plates are machined in a manner similar to that of the prototypes, the orifices for the various lines were sized using the discharge coefficient for the round edge orifice because the calculated values were in good agreement with the empirically obtained values for this case. The final calculated orifice diameters for the round edge, sharp edge, and short tube cases are listed in Table 2.
Date: August 9, 1988
Creator: Kurita, C. H.
Partner: UNT Libraries Government Documents Department

End Calorimeter Support Carriage Analysis

Description: The design of the EC carriage is based on the design of the CC carriage documented in D-0 Engineering Note 3740.215-EN-14. The non-symmetric weight distribution of the EC cryostat results in uneven loading of the arms of the EC carriage. The design load on each rear arm is 220,000 lb, while each front arm supports 40,000 lb. (The CC carriage design load was 200,000 lb on all four arms.) ANSYS finite element models were made representing various combinations of plate thicknesses in an attempt to balance the deflections of the arms. In the final design a 3/4-inch curved top plate is used with an additional 1.75-inch thick 'doubler plate' incorporated into the rear arms. The bottom flanges are 2-inch and 3/4-inch for the rear and front arms, respectively. Web plates are 3/4-inch for all arms. The carriage bottom plate is 2-inch thick, and other details are similar to the CC design.
Date: February 26, 1991
Creator: Weber, K. & Luther, R.
Partner: UNT Libraries Government Documents Department

Flexible Support Liquid Argon Heat Intercept

Description: A device in the flexible support system for the Central Calorimeter is the Liquid Argon Heat Intercept. The purpose of this apparatus is to intercept heat outside the inner vessel so that bubbles do not form inside. If bubbles did happen to form inside the vessel, they would cause an electric arc between the read-out board and the absorption plates, thus destroying the pre-amplifier. Since this heat intercept is located in the center of the flexible support, it must also support the load of the Central Caloimeter. Figure 1 shows how the intercept works. The subcooled liquid argon is driven through a 1/4-inch x 0.049-inch w tube by hydrostatic pressure. the ambient heat boils the subcooled argon. The gaseous argon flows through the tube and is condensed at the top of the vessel by a 100 kW cooling coil. This process is rpesent in all four flexible support systems.
Date: May 18, 1987
Creator: Rudland, D.L.
Partner: UNT Libraries Government Documents Department