Tray clips

Actually, the tray decks are not ripped away from the support ring. Inspection of damaged trays indicates the decks have been bent at the ring. The trays are not bolted to the tray ring they are clipped to the support ring (see Fig. 3—5). In the course of bending, the tray pulls the tray clips away from the support ring. 

Tray clips tight. Trays bolted together tight. 

A Beckmann Freezing-point Apparatus.—The form of apparatus is shown in the accompanying Fig. 30. It consists of a glass jar standing on a metal tray and furnished with a stirrer. The cover of the jar has a wide slit to admit the stirrer, and a circular aperture with clips to hold a wide test-tube. 

Hold one edge of trie paper by means of two clips, dip it into the trough up to the upper edge, and then draw the paper slowly (in about 5 seconds) thru the soln and up and over the side of the trough in order to remove the excess liq from the paper. Hold the paper in a vertical position over the tray until the liq starts to drip, then grasp the bottom edge by use of two clips. Wave the strip gently to and... 

Since a large part of the beer market is take-home beer, brewers must provide retailers with packs that are easily handled and stored. Clear shrink wrapping has become a dominant feature because it permits the content of the pack to be seen. Other packaging methods are Shrink Wrapped 2 dozen Tray Pack, Cardboard Sleeve, Hi Cone 3 Pack, Hi Cone 6 Pack in Tray, and Top Clip Botde Pack (see Packaging MATERIALS). 

Tanks similar to those for descending development can be used, with paper sheets, suspended from the lid, a glass rod, or a frame, dipping into solvent held in a tray on the floor of the tank. Alternatively, the paper can be stood in solvent by rolling it into a cylinder held together by staples or plastic clips [7]. This allows wider sheets to be developed in low volume cylinders or tanks. Special frames can accomodate several sheets for simultaneous development [39] (Fig. 5.9). 

Conductor cross- sectional area Reference Method A (enclosed in conduit in an insulated wall, etc.) Reference Method B (enclosed in conduit on a wall or ceiling, or in trunking) Reference Method C (clipped direct) Reference Method E (on a perforated cable tray) or in free air OD D CO O (D... 

The cable may be laid directly in the ground, in ducts, on cable tray or clipped directly to a structure. It is not affected by water, oil or the cutting fluids used in engineering and can withstand very high temperatures or even fire. The cable diameter is small in relation to its current-carrying capacity and it should last indefinitely if correctly installed because it is made from inorganic materials. 

Individual conductors may be installed in trunking or conduit and individual cables may be clipped directly to a surface or laid on a tray using the wiring system which is most appropriate for the particular installation. The installation method chosen will depend upon the contract specification, the fabric of the building and the type of installation - domestic, commercial or industrial. 

The rigid aluminum TLC frame, 10 cm plastic bag, filter paper saturator strips, aluminum developing tray, and clamp and fishhook are assembled, and the mobile phase is added. The TLC sheet is attached to the aluminum frame with the clip and lowered into the plastic bag with the fishhook. Paper clips are placed behind the sheet (between the sheet and the aluminum frame). The sheet is essentially suspended in space and is held only with the clip. The mobile phase will advance in a straight line. The sheet is allowed to stay in the bag without contacting the mobile phase for about 5 min to reach equilibrium, after which the plastic bag is pulled down to allow the mobile phase to contact the lower 1 cm of the layer. Development is carried out to within 1 cm of the top of the sheet with 15-18 ml of the mobile phase specified for the particular drug being analyzed methanol-conc. ammonium hydroxide (25 0.38), methanol-acetone-conc. ammonium hydroxide (13 17 1), or ethyl acetate-glacial acetic acid-conc. ammonium hydroxide-water (12 12 4 4). The development bag and back-to-back aluminum trays will accommodate two sheets at a time. 

Beam seats and clips allow the top flange, or top of beam, to be level with the top of the support ring. This is a very convenient feature for this type of support. In effect, it creates a level surface to support the grating or tray plates. Conversely, if the beams are supported by the support ring, then the bottom flange of the beam will sit on top of the support ring. For most applications this would be unacceptable. In order to make the... 

Maintenance Loads Tray support members (all beams, support clips, etc.) shall be designed for a concentrated load of 300 Lbs (135 Kg) at any point on the installed assembly. The design shall be based on the corroded thicknesses and an allowable stress of. 9 Fy. For maintenance loads, stresses in tbe tray plates need not be considered. 

To avoid this problem of intrinsic tray weakness, the support lips (also called "integral trusses") are attached to the vessel wall. As shown in Figure 3-5, a bracket is welded onto the vessel wall below the ring. The support lip is attached to this bracket with a "shear clip." Now tlie trays integral truss is attached to the vessel wall. 

The shear clip must be designed to break away from the vessel wall at some predetermined stress. Otherwise, a powerful pressure surge could deform the wall of the vessel itself. However, if the shear clips can be designed to be strong enough to withstand a AP across the tray deck of about 0.6 psi (i.e., about 2 ft of hydrocarbon liquid) the downcomers would blow clear before the shear clips would fail. Hence, the downcomers would act as a partial safety bypass and protect the tray decks from damage. 

The applications of materials produced using the sintering technique are wire baskets, trays, door accessories, clips, books, clamps, metal containers and tanks for corrosive liquids and pastes, metal fittings used in joining with PE and other plastics, stirring equipment used in chemical laboratories and industry, and many others. 

Shear clips Weld the shear clip to the underside of the tray as shown in Fig. 5.8, but certainly not to the tray ring. 

Figure 9.4 Shear clips improve the mechanical integrity of the tray deck.

Bolt the trays to the tray ring, or use back-to-back trays with shear clips (see my book. Process Design for Reliable Operations, for mechanical details). This will help to avoid tray failures due to pressure surges caused by high liquid levels. 

Figure 8.4 Shear clips Improve the mechanical Integrity of the tray deck.

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