Baseplates

Ikai A, Yoshimura K, Arisaka F, Ritani A and Imai K 1993 Atomic force microscopy of bacteriophage T4 and its tube-baseplate complex FEBS Lett. 326 39... 

The furnace and thermostatic mortar. For heating the tube packing, a small electric furnace N has been found to be more satisfactory than a row of gas burners. The type used consists of a silica tube (I s cm. in diameter and 25 cm. long) wound with nichrome wire and contained in an asbestos cylinder, the annular space being lagged the ends of the asbestos cylinder being closed by asbestos semi-circles built round the porcelain furnace tube. The furnace is controlled by a Simmerstat that has been calibrated at 680 against a bimetal pyrometer, and the furnace temperature is checked by this method from time to time. The furnace is equipped with a small steel bar attached to the asbestos and is thus mounted on an ordinary laboratory stand the Simmerstat may then be placed immediately underneath it on the baseplate of this stand, or alternatively the furnace may be built on to the top of the Simmerstat box. 

Fig. 7. Mercury cathode electroly2er and decomposer (11) 1, brine level 2, metal anodes 3, mercury cathode, flowing along baseplate 4, mercury pump 5, vertical decomposer 6, water feed to decomposer 7, graphite packing, promoting decomposition of sodium amalgam 8, caustic Hquor exit 9, denuded mercury 10, brine feed 11, brine exit 12, hydrogen exit from decomposer 13, chlorine gas space 14, chlorine exit 15, wash water.

Standard Chemical Pump. In 1961, the American National Standards Institute (ANSI) iatroduced a chemical pump standard (29), known as ANSI B73.1, that defined common pump envelope dimensions, connections for the auxiUary piping and gauges, seal chamber dimensions, parts mnout limits, and baseplate dimensions. This definition was to ensure the user of the availabiUty of iaterchangeable pumps produced by different manufacturers, as well as to provide plant designers with standard equipment. A typical ANSI chemical pump, known as of the mid-1990s as ASME B73.1M-1991, is shown ia Figure 6. 

As an approximation, 50% of the Hst price should be added to account for auxiUaries such as motor, seal, baseplate, and coupling. Furthermore, the material upgrade from ductile iron constmction to stainless steel roughly doubles the price. Pump manufacturers use price bookmultiphers, eg, discounts, to arrive at a selling price. These vary, but as an estimate, a 30% discount is reasonable. U.S. pump manufacturers include the following. 

During startup, the baseplate heat shields ate lowered, thereby allowing pump-down through a large gap. The heat shields can then be raised to produce a narrow gap when maximum temperature is requited. 

Baseplate. Baseplates shall he rigid and suitable for mounting pump and motor. Baseplates shall he of channel steel construction. 

As the final part of the repair proeess, the expander underwent a trial assembly at the repair faeility. The aetual job assembly and disassembly fixtures were used during the trial assembly. No signi-fieant problems were eneountered and internal elearanees were to speeifieations. As the assembly bed plate at the repair faeility did not exaetly duplieate the user s baseplate, there was some eoneern that readjustment would be required in the field to obtain elearanees. To faeilitate the field assembly proeess, appropriate pins and fixtures were manufaetured to hold axial and eoneentrie positions of the diffuser and stator as they were in die repair shop. The entire expander trial assembly was eompleted one mondi ahead of sehedule. 

All vibration equipment shall eonform to API 670. The probes shall be properly loeked to prevent movement during operation. Conneetions from oseillator/demodulators to the Purehaser s wiring shall terminate at suitable terminal bloeks loeated within junetion boxes mounted at the edge of the unit or baseplate. The probes shall be externally removable and adjustable without unit shutdown. 

Connections by vendor il degasilier is mounted on compressor baseplate. 10 Degassing drum. 

The larger the gear unit, the more important this eheek beeomes, sinee large housings tend to be more flexible. Also, the use of baseplates furnished by the original equipment manufaeturer does not eliminate faee eontaet problems, and these inspeetion proeedures should be earried out. 

Either soleplates or baseplates should be furnished for most of the compressor types. Reciprocating compressors are sometimes directly... 

LUBE OIL COOLING BLOCK COOLING CONTROL UNIT BASEPLATE... 

SEAL SYSTEM CONTROL UNIT COMBUSTION CONTROLS BASEPLATE... 

Centrifugal pumps require a rigid foundation that prevents torsional or linear movement of the pump and its baseplate. In most cases, this type of pump is mounted on a concrete pad or pedestal having enough mass to securely support the baseplate, pump and its driver. The following general mles apply to foundation design. 

A mode curve exhibiting this shape could indicate that the motor mountings, or the baseplate under the motor, are loose and that the motor is moving vertically. In fact, in the example from which this figure was taken, this is exactly what was happening. The blower s baseplate floats on a one-inch thick cork pad, which is normally an acceptable practice. However, in this example, an inlet filter/silencer was mounted without support directly to the inlet located on the right end of the machine. The weight of the filter/silencer compressed the cork pad under the blower, which lifted the motor-end of the baseplate off of the cork pad. In this mode, the motor has complete freedom of movement in the vertical plane. In effect, it... 

Because most units are designed in such a manner that realignment is not intended, it is necessary to change this design feature. Specifically, the rabbet fit between the motor flange and the baseplate is the major hindrance to realignment. 

Figure 54.24 Diagram of a baseplate with hold-down bolts numbered...

Once the angularity has been corrected by making the necessary shim adjustments at each of the hold-down bolts, it is necessary to correct the offset by sliding the moveable unit (i.e., motor in this example) on the baseplate. The top dial indicator is used to monitor the movements as... 

Note The motor position on the baseplate must be adjusted in order to align the equipment, which may require machining or grinding of the rabbet fit. Remember, however, the rabbet fit is only a positioning device and is not a structural support. 

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