PMC

(A) Digital render of the vacuum flange structure with components for vacuum sealing. The test piece was designed with a top hat profile with a diameter of 70 mm and indium sealed onto a stainless steel flange. The stainless steel flange had a bore hole of 30 mm in the centre and 6 M6 tapped holes to apply pressure to the indium seal. Once sealed the DN40CF flange is attached to the chamber using a standard copper gasket. The holes in test piece are compatible with a DN40CF flange. (B) The DN40 CF flange and test piece prior to Assembly.

Figure 3A. Dewar.
The cells shown in are shown in brackets at a. Stepped pressure-sensing tubes for cells B, C, and D are labeled bb’, cc’, and dd’ respectively. The steps are in thermal contact with liquid He⁴ refrigerant pot, f , at flange, e, and with liquid N₂ pot g, at flange, h. Copper radiation shields are bolted to f at flange, e, and to g at flange, h. To minimize the thermomolecular pressure gradient without unduly increasing heat leaks, tubes W and cc’ increase in inside diameter from 0.133 cm to 0.583 cm at e, and to 2.49 cm at h. Tube dd’ increases from 0.266 to 1.85 at e, and to 4.89 cm at h
Figure 3B. A sectional view shows the details of reducing couplings which also serve as radiation shields in each of the vapor pressure-sensing tubes.
The couplings are soft soldered to flange, h.

Flange joint load: (a) view of a bolt with a marked vector of the bolt-shortening direction; (b) view of the bolt assembly in the flanged joint; (c) joint load surface with 2 MPa pressure; (d) defining the displacement vector towards which the pipeline fragment was bent.

The acrylic negative pressure face shield oriented upright demonstrating inferior attachment flange (dotted arrows), flat upper surface, anterior access ports and suction port on the side