Suction line filters

Such inlet strainers, of course, do not remove any pump-generated contantina-tion, which is then fed directly into the system on the pressure side. Equally, they are not necessary in systems with closed reservoirs, with silt-control filtration on the return line, or where fluid is introduced into the system upstream of the return line filter. Suction line filters are cheap, but do not usually have indicators to show when they are dirty or blocked. 

Keep the delivery temperature below 140°C. It is easier to do this if the inlet filters are kept clean and the suction line is not throttled. On some rotary air compressors, a large oil surface is exposed to the air, deposits readily form and ignite, and the temperatures should be kept lower. 

Ab6aug(e) flasche, /. suction flask, filtering flask. haube, f. suction hood. kolben, m. suction flask, filter flask, -leitung, /. suction piping, suction line. 

Feedwater pipework will normally be gravity head suction from the hotwell or feed tanks to the pumps and at a pressure in excess of the boiler working pressure from the pumps to the boiler. Few problems occur on the pipework between pumps and boilers. However, inadequately sized suction lines can give rise to cavitation at the feed pump with subsequent boiler shutdown. The feed tank should always be positioned to suit the temperature of the feed-water and the pipework sized to give free flow at that head, taking account of bends, valves and filters. 

Strainers are used primarily to catch only very large particles and will be found in applications where this type of protection is required. Most hydraulic systems have a strainer in the reservoir at the inlet to the suction line of the pump. A strainer is used in lieu of a filter to reduce its chance of being clogged and starving the pump. However, since this strainer is located in the reservoir, its... 

Dorrco Continuous Suction Filter has, in contrast to Oliver, its filtering surface on the inside of the drum, and the suction line on the outside. It is described by Riegel (Ref 1, p287—88 Fig 232) and by Perry (Ref 2, p979 Fig 81)... 

As the 1.2-pm and the 0.8-pm filters allowed a significant amount of NG through, it was decided to introduce the 0.45-pm filter coupled with a more powerful pump (Edwards E2 M12 pumping rate -240 liters per minute), the increase in pump capacity to enable two suction lines to be run to two... 

The revised suction sampling device was tested by comparison with the previous device. Results are presented in Table 25.5. This represents a good recovery of NG when compared to Table 25.4 and illustrates that the device is effective. However, in this instance only one membrane filter was present in the suction line consequently, like is not being compared with like. The improved recovery may be due to a combination of factors. 

Just before a plant startup, the operations team wondered if the piping upstream of a flammable gas compressor may not have been cleaned sufficiently to prevent dirt from entering the precision machinery. Concerned employees had a temporary filter installed in the suction line. The operations team was correct there was a sufficient amount of foreign material in the upstream piping to plug up the filter. [8]... 

A filter is normally installed in the suction line to the high-pressure pump to protect the pump and the hard chromium-plated scraped-surface heat exchanger cyhnder from any foreign matter in the margarine emulsion. 

Fresh catalyst is normally delivered in hopper-bottom railroad cars. The catalyst may be withdrawn by gravity flow from the bottom of the car through a hose to a Fuller-Kinyon screw pump and transferred to the hopper by means of an air stream loss of catalyst is prevented by a cyclone on the air discharge from the hopper. Alternatively, the catalyst may be unloaded from the top of the ear by a vacuum lift. In this case, the suction line passes through a separator with bag filters, located above the storage hoppers. The catalyst collects in a chute and flows down through a rotating barrel-valve feeder into a screw conveyor which transfers the catalyst to the hopper (105). 

Low solids content in product slurry. The cause of this is probably a restriction in the slurry pump suction line. Lumps can cause such restrictions and act as partial filters. When the problem occurs, it can usually be corrected by flushing the slurry line. 

Sflow whenever the pump operates. Inlet line filters are recom-ed, but care must be taken not to cause excessive pressure drop on the suction side. Typical inlet filters use sieve openings of 0.0059 in (0.149 mm). 

For the Zaporozhe NPP, the 3 suction lines of the 3 trains of the low pressure injection system are connected to the containment sump. This sump is filled in normal operation with 630 m of borated water, A test was performed on Units 5 and 6 during which the spray pumps and low pressure injection pumps worked 72 hours to demonstrate that the design has been well adapted. The loss of water due to trapping in certain areas of the containment after spraying situation is estimated to be about 200 m. However the test showed that the filters into the sump should be modified in order to reduce the number of the filter-grids damaged by loose parts and plugged by thermal insulation material. 

Filter cost generally increases with increasing size and inaeasing ratio, with size having more effect. Since suction and pressure line filters must handle higher pressure flows, these installations may require larger, more expensive filters. Return line and bypass filters, on the other hand, operate at lower pressure and are usually less expensive. 

Vacuum systems (Fig. 21-12h) are characterized by material moving in an air stream of pressure less than ambient. The advantages of this type are that all the pumping energy is used to move the product and that material can be sucked into the conveyor line without the need of a rotaiy feeder or similar seal between the storage vessel and the conveyor. Material remains suspended in the air stream until it reaches a receiver. Here, a cyclone separator or filter (Fig. 21-12c) separates the material from the air, the air passing through the separator and into the suction side of the positive-displacement blower or some other power source. 

Polyarylsulfones offer materials with good thermal-oxidative stability, solvent resistance, creep resistance, and good hydrolytic stability. Their low flammability and smoke evolution encourage their use in aircraft and transportation applications. They hold up to repeated steam sterilization cycles and are used in a wide variety of medical applications such as life support parts, autoclavable tray systems, and surgical and laboratory equipment. Blow-molded products include suction bottles, surgical hollow shapes, and tissue culture bottles. PPS has a number of automotive uses including as an injection-molded fuel line coimector and as part of the fuel filter system. 

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