Levelling screws

Vertical leveling screws spaced for stability shall be provided on the outside perimeter of the baseplate. They shall be located adjacent to anchor bolts to minimize distortion during the process of installation. These screws shall be numerous enough to carry the weight of the baseplate, pump, and drive train components without excessive deflection, but in no case shall fewer than six screws be provided. 

L.4.5 The baseplate should be located in the desired position by snpporting it on shims or leveling screws and seeming it with anchor bolts. Approximately 25-50 mm (1-2 in.) of gronting clearance should be allowed between the bottom of the baseplate lim and the top of the scarified fonndation. 

A222 Vertical level screws VERT SCREW C 1 1 ryes (true) Or no (false)... 

Close the gate of a Bostwick consistometer and adjust leveling screws until the leveling bubble indicates that the consistometer is level. 

One satisfactory type of apparatus is illustrated diagrammatically in Mg. 7. There is a trough on three levelling screws (not shown), filled to the brim with water an instrument with two torsion wires for measuring... 

Figure E38-2. Apparatus for this experiment. (A) cover plate. (B) electrode. (C) baffles. (D) acetate strip. (E) agarose layer. (F) sample spot. (G) electrode plugin. (H) buffer. (I) leveling screws. (J) electrical connections. (K) power supply. (L) amperes. (M) volts. (N) coarse adjust. (O) fine adjust. (P) main switch. (Q,S) output plugs. (R) pilot light. (T) polarity switch.

Inspect the apparatus. If it has a multiple unit power supply, be sure the unused sections are shorted out so the remaining units will operate. Be sure the power is OFF, then remove the cover and locate the platinum electrodes, the support rack, the leveling screws, and the buffer level marker. 

Look careftilly at the leveling marks and the buffer level on both sides and adjust the leveling screws if necessary to level the tank. 

Weir distributors are prone to out-of-levelness more than any other distributor because the flow rate through a triangular notch is proportional to the liquid head raised to the power of 2.5 (flow rate through an orifice is only proportional to the liquid head raised to the 0.5 power). With weir distributors, an out-of-levelness of 1 or 2 in is sufficient to cause severe maldistribution (237, 436). One case was reported (436) in which a distributor in a 40-ft tower was installed to a level tolerance of Vie in to avoid this problem. Adjustable leveling screws are often provided and should always be specified with this distributor to enable an in situ level adjustment. The problem is most severe at low liquid rates and tumed-down conditions. 

Distributor levelness affects the quality of distribution, especially under turned-down conditions, when liquid head is low. Careful design and inspection are required to ensure that the distributors are level. Inspection with level gages is strongly recommended for weir-type distributors. Weir-type distributors should be specified with leveling screws to enable in situ level adjustment. 

Support beams must be installed level, or tray levelness may be difficult to achieve, especially in large columns. Support beams are often equipped with levelling screws (288) to permit on-site levelling. A less satisfactory alternative is using slotted holes on the joint of a major support beam to its shell support brackets. Slotted holes, however, are often used on the joints of minor beams to the major support beam to allow levelling. 

An out-of-level twist will increa.se wear and tear on the machine and tooling. If the Level indicates a twist in the bed, the isolator leveling screws. should be turned at the low comers. Adju.stments should be made in small increments until the bubble is precisely centered on both the right and left edges. 

Adjust the leveling screws in both isolators at the low and equally and alternately, making only small adjustments at a time, until level. 

Whatever method is used to install, mount, and level the machine, a recheck of leveling by the maintenance group should occur after the first 3-6 weeks of operation. If the level and flatness of the bed are still good, then it should be rechecked 6-13 weeks later, a third check 3-6 months later, a fourth at 6-12 months, and once a year thereafter. Fortunately, isolators make it easy to make needed adjustments, as the millwright simply loosens the locknut on the isolator, adjusts the leveling screw, and retightens the locknuts. Production can start again immediately. 

The press bed was leveled to the machine builder s specifications on all four edges by adjusting the isolators leveling screws. Flatness was within specifica-... 

Apparatus The coalescence experiments were carried out in a spinning drop interfacial tensiometer. Model 300, manufactured by the University of Texas. Inclination of the apparatus, which provides the buoyant force for coalescence, can be accomplished by turning a leveling screw. Use of this screw permits the tilting of the apparatus up to 7 upwards or 3° downwards. The angle is calculated from the location of a pointer placed on the end of the apparatus. 

Mount the beam on the adjustable stand with the plummet suspended (in air) from its hook. By means of the levelling screw and the threaded counterpoise (screw weight), balance the beam (without riders) until the indicator jKiints Dj and D>... 

A - Levelling screw C - Table E - Grease cup G - Hardened-steel tip I - Shaft K - Dial rod M - Circular dial... 

The scale can be graduated to take account of the liquid density, inclination, and cistern-level shift so that readings will be in convenient pressure units such as equivalent vertical inches or centimeters of water. A spirit level and leveling screws are usually provided so that the designed angle can be reproduced in installation. 

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