Splash packing

Possible reduction in pumping head (e.g. the change from a splash pack to a high-density film-type pack can save power by installing the new pack at the bottom of the former splash area and lowering the pump inlet). If the correct design is used it may be possible to... 

The two major types of fill arrangements are splash packing and film packing. Both are illustrated in Figure 4.13. The role of any packing material is to generate as much air-water interfacial contact area as possible within the limitations of minimum air-pressure losses. 

In general, film-type fill occupies less volume and requires less shell height than the splash type however, the film type is subject to clogging and fouling. Splash packing are often easier to repair or replace. 

Figure 4.13 Operating principles behind splash-packing and film-packing arrangements.

Can any sagging of the fill/splash-pack be seen from inside the plenum Are the surfaces clean Are the distribution pipes sound ... 

I. High-voidage packings, cooling towers, splash-grid packings... 

Cellular Film Asbestos fill packing that converts water droplets into a thin molecular filter for more efficient cooling. Less static pressure is encountered than with splash-bar fill, thus permitting the use of higher air velocities. 

Fill Packing Specially designed baffling used to provide a large surface area for heat transfer. Two classes of materials are used splash bars of wood, metal transite or plastic and film pack (cellular fill). The splash type cools the water as the droplets bounce down a series of bars in the air stream film packing converts droplets into a thin film. 

The frame lubrication system circulates oil to the frame bearings, connecting rod bearings, crosshead shoes, and can also supply oil to the packing and cylinder lubrication system. Splash lubrication systems are... 

This latter type appears similar to some previously discussed, closely spaced structural packing, but is specifically designed for this application. Beyers [148] recommends film fill as the best choice if the water conditions of Table 9-49 are appropriate. For scaling or plugging water conditions, select splash fill. 

Bearings pre-packed with grease will function for extended periods without attention. Another advantage is the almost complete elimination of drip or splash, which can be a problem in certain applications. Grease is also able to operate effectively over a wider range of temperatures than any single oil. 

The type of packing used can be as simple as splash bars but is more likely to be packing similar in form to that used in absorption and distillation towers. The temperature limitation of the packing needs careful attention. Plastic packing has severe temperature limitations, as far as the cooling water return temperature is concerned. If the... 

The gravity distribution basin located at the top of a crossflow tower is left open to the atmosphere. Water gravitates through orifices to the tower packing below, thus providing a splash-type pattern. 

Low liquid rates. With the aid of serrated weirs, splash baffles, reverse-flow trays, and bubble-cap trays, low liquid rates can be handled better in trays. Random packings suffer from liquid dewetting and maldistribution sensitivity at low liquid rates. 

Go to the Turks and Caicos Islands and you ll need to pack a color chart along with your swimsuit. How else to identify the dozens of variations of blue that radiate out from the islands beaches First, you wade through inch-deep aquamarine. Then you splash through cerulean, pale turquoise, hght jade and cyan, before reaching a 7,000-foot-deep coral wall bathed in Prussian and cobalt blue. 

In pipe-orifice distributors, each orifice delivers a liquid stream to the packed bed. Pipe orifice distributors have the advantage that they are relatively compact and occupy a small vertical space in the tower. However, they tend to be very expensive. A separate orifice is needed for each drip point onto the packing. Typical designs call for between 5 and 15 drip points per square foot (50 and 150 drip points per square meter). The minimum orifice size is set by the fouling tendency of the system. Liquid velocities leaving the orifice should be kept to under lOft/sec (3m/sec). This prevents excessive liquid splashing on the top of the packed bed. 

Picket fence weirs are used in low-liquid-rate applications (Fig. 8). Picket fence weirs can serve two purposes at low liquid rates. First, they reduce the effective length of the weir for liquid flow increases the liquid height over the weir. This makes tray operation less sensitive to out-of-level installation. Second, pickets can prevent liquid loss (blowing) into the downcomer by spraying. This occurs at low liquid rates when the vapor is the continuous phase on the tray deck. Picket fence weirs should be considered if the liquid load is less than 1 gpm per inch of weir (0.0267 ft /sec/ft, 0.00248 m /sec/m). At liquid rates lower than 0.25 gpm per inch of weir (0.00668 ft / sec/ft, 0.000620 m /sec/m) even picket fence weirs and splash baffles have a mixed record in improving tray efficiency. Operation at liquid rates this low strongly favors the selection of structured packing. 

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