It varies based on the actual application demands where this mechanical device is used.

Some applications would require a relatively raised angle, whereas others may need a much-lowered angle.

When designing this equipment, it is important to note that a higher inclination angle often leads to a higher particle production rate.

Technically, a higher inclination angle increases a higher production rate because of the increased particle velocity but at the cost of screening efficiency.

On the contrary, reducing the inclination angle leads to longer particle residence time within the equipment system.

In the long run, it increases the screening efficiency.

However, a suitable elevation angle for rotary drum screens in most applications ranges from 30-35 degrees.

In essence, this angle facilitates you to obtain a comparatively large filtration area than a vertical or steeply inclined way.

At this angle, you also attain low headloss and quite a high separation efficiency.

Generally, the design construction of this mechanical device in relation to its actual applications makes it quite durable.

It can last for several years, but the exact durability is dependent on many factors such as the following;

Welding Technology

Ordinarily, the welding technology used for constructing the different components of this device, including the base frame, determines its durability.

Using a welding technology, which can hide and improve strength of the weld, is important in increasing the service lifespan of this equipment.

Type Of Material

Rotary drum screen is made of different components, which are also designed from a wide range of materials.

However, different materials exhibit varied technical characteristics, which ordinarily determine the overall longevity of the equipment.

Thus, a rotary drum made from high tensile materials such as stainless steel would provide a better service lifespan.

Application Conditions

This mechanical equipment is used in a wide range of applications in various industries.

But the specific applications require different conditions such as temperature variance, operating duration, chemical content, etc.

Therefore, the actual longevity of this equipment is heavily dependent on the particular conditions of the application.

Condition Of The Equipment

You can always get a new or used rotary drum screen.

In these instances, the condition of the equipment will vary significantly.

A new rotary drum screen will last longer than a used one because it is in fine condition.

Used rotary drum screen, on the other hand, may have short durability depending on its physical condition.

In other words, this mechanical device generally exhibits more extended durability under normal circumstances.

However, the actual longevity is dependent on many factors, including the few mentioned above.

Ideally, a rotary drum screen is an essential device used in many commercial and industrial applications.

It means it is a worthy investment since it offers several applications such as the following;

       i. High Capture Rate

Since the drum is fed internally, it makes it easy to catch different debris such as rocks, rags, fibers, grits, organics, wipes, etc.

It has a perforated plate, which provides a high capture rate of different materials as tiny as 800 microns.

Of course, this is important because it makes it an ideal solution for fine screening.

      ii. Simple And Reliable Construction

The screening mechanism of this component is hi-tech and rarely requires any maintenance.

It features a relatively basic construction but offers and guarantees higher reliability, which is vital in most of its applications.

    iii. Features An Integrated Bypass

You can find a rotary drum screen with an integrated bypass that enables the sensor to stop the drum.

It also makes the overflow route to a different tank containing a manual rack enhancing the overall efficiency of the equipment.

    iv. Minimal Maintenance

The design construction of this equipment is pretty simple hence requires insignificant maintenance.

Furthermore, it has a screen net, which can clean itself when operating.

It also operates at moderate speeds; thus, the gravel and hard other hard objects can hardly damage its components.

      v. Safe And Easy Access

This equipment features a cover equipped with a lift handle on both sides of the drum.

Moreover, it features a hydraulic assist mechanism, making it possible for a single operator to easily open the cover.

Rotary drum screen also comes with an automatic safety switch, which stops the drum if there is a safety emergency.

    vi. Relatively Affordable

The purchasing price of this component is relatively affordable.

You can buy it in different sizes or capacities depending on your budget.

The bottom line is you can always find what suits your budgetary requirements.

   vii. All-in-one Solution

You can always integrate a washer directly at the discharge chute for complete screening treatment.

A typical rotary drum screen comes with different features designed to perform a specific function in the screening process.

Of course, these features tend to vary from one piece of equipment to another depending on different customizations required.

However, the salient features you are likely to find in most rotary drum screens include the following;

• Stainless steel base frame
• Temperature control ability
• Hydraulic operation option
• Perforated or Wedge wire screen basket
• Bolted brushes and spray nozzles for screen basket cleaning
• Tough protection featuring bolted stainless steel wearing bars
• Shaftless spiral conveyor screw

 Internally Fed Rotary Drum Screen

Screens used in rotary drums are mainly available in two types, which include the following;

1. Wedge-wire screen – It features a V-shaped profile designed to reduce the risk of clogging and at the same time enhancing permeability ratio.

Wedge Wire Rotary Drum Screen

1. Perforated screen – The design of this screen is to offer a high capture rate of materials, which seem to be bigger than the perforation size.

Perforated Screen

A typical rotary drum screen features a wide range of parts and components integrated to provide desired results in the filtration process.

However, the actual parts may vary from one model of this equipment to another one.

But the main parts and components you are likely to find across different models include the following;

Transmission device – It is a component interposed between the power source and the equipment to adapt to each other. This device determines the ideal speed at which the equipment rotates.

Overflow weir water distributor – This refers to a fabricated channel, which a weir plate has been installed. It acts as an upstream weir pool, allowing water to flow through before it spills to the weir plate.

Rinse water device – As the name suggests, the role of this component is to clean water separated from the solid material.

Frame – It is the component supporting the rotary drum screen and provides sturdy platforms for attaching other components. In essence, it reduces vibration and prevents excessive or unnecessary movement between driving and driven components.

Sensors – These are devices, modules, and subsystems actuated to detect different changes and processes within the equipment during operation.

Pressure unit– The design of this component is to regulate the air systems within the rotary drum screen.

Flush device – It is designed to maintain slow continuous flow of solutions to minimize risk of blockage.

Drum sieve – This is a relatively wide, round, and low-walled component designed to strain liquid and separate it from solid materials for further processing.

Technically, the design of a rotary drum screen offers four major functions.

These functions include; getting rid of dregs, intercepting dregs, pressing dewatering, and spiral lifting.

Essentially, water gets into the overflow weir distributor from the pipe mouth steadily.

After a while, the water evenly overflows from the water outlet and distributes the filter drum rotating in the opposite direction.

Steady water flow generates a shearing motion with the internal wall of the filter drum.

Solid is retained and separated from liquid material by tumbling due to spiral guide plate in the filter drum.

Wastewater is filtered out from the filter drum flows out from the side sink under the flow guiding of protection seal.

The external filter drum features a flushing water pipe sprayed in a fan-shaped motion to flush and dredge the filter mesh.

Essentially, this is to ensure it continuously maintains good filtering ability.

While at it, the entire process is clear and hardly emits any odor.

Using A Drum Screen In Waste Water Treatment

They are quite a number, but the major factors include the following;

• Material feed rate
• Size and number of screen apertures
• Characteristic of the feed
• Residence time taken in the rotating drum
• Rotation speed of the rotary drum screen
• Inclination angle of the drum

This mechanical screening device can be used in a wide range of applications across different industries.

Ideally, you can use it in different applications where there is a need to extract fine solid particles from wastewater.

Most industries where the use of this device is quite common to include the following;

• Municipal solid waste management and treatment
• Brewing and beer manufacturing industry
• Fisheries, poultry, and dairy products processing industry
• Paper and textile industry
• Sugar and fruit processing industry
• Fiberglass processing industry
• Meat packing industry
• Industrial waste treatment

It varies extensively based on several prevailing factors.

For instance, different manufacturers often price this equipment differently depending on their respective company pricing policy.

Also, the specific size of the rotary drum screen you are buying determines the price.

Often, relatively large ones tend to be more expensive than those with small capacity.

The specific material used for making different components of the rotary drum also determines the price.

Mostly, stainless steel is preferred as ideal material and tends to be more expensive than other materials.

Most importantly, the customization needs on this component is also a fundamental factor influencing pricing.

Simply put, the actual price of a rotary drum screen is dependent on several factors, including the few ones mentioned herein.

These refer to the specific mechanisms affecting the screening efficiency and production rate of rotary drum screens.

The main particle motion mechanisms in this aspect include the following;

Slumping

It usually occurs when the rotational velocity of the drum is somewhat low.

In this case, the particles are lifted marginally from the bottom of drum before tumbling down the available free surface.

In slumping, only small-sized filter particles close to the wall of this equipment’s body can be screened hence lower screening efficiency.

Cataracting

It is a mechanism effected by the increase of slumping velocity.

In essence, it happens when particles detach near top of a rotating drum.

Thus, large particles segregate close to the inner surface while the smaller granules stay close to the screen surface, enabling smaller filter particles to pass through.

This motion often generates turbulent particle flow leading to higher screening efficiency than slumping.

Centrifuging

It occurs due to increased cataracting mechanism velocity.

This mechanism leads to lower screening efficiency since the particles are attaching to the wall of rotating rotary drum screen.

It is always important to consider several elements when purchasing a rotary drum screen.

Essentially, it makes it possible to attain the best and efficient results when filtering wastewater and other related applications.

Some of critical elements to look into when buying this mechanical screening equipment include the following;

• Technical and structural specifications of the rotary drum screen
• Integrated safety features
• Production capacity within a specified timeline
• General durability of the main parts and components
• The equipment size in regards to the workspace availability
• User-friendliness
• Aftersales customer support
• Availability and cost of main parts and components
• Warrant
• Initial cost in relation to your budget

It varies depending on the size and other relevant technical specifications of the rotary drum screen you are using.

Moreover, the filtration capacity is also dependent on the specific type of material you are screening.

However, a typical rotary drum screen can filter up to 2,000 liters per minute.

You can also get industrial and municipal wastewater management rotary drum screens with up to 10 000 liters per minute filtration capacity.

Commonly referred to as FAT, it is a significant machining element both to the user and the seller.

Of importance, it guarantees both parties that the equipment meets all the necessary requirements and other relevant predetermined obligations.

Conducting this assessment makes it easy to determine and address any mechanical or structural issue of the equipment before it leaves the factory.

In essence, it becomes easy to figure out all the safety concerns of a rotary drum screen, which is vital for the operator and the environment.

FAT also makes it easy to determine the specific party responsible for any issues or malfunction of the equipment as detected.

In a nutshell, Factory Assessment Test is vital in determining the efficiency, performance, credibility, and safety of the rotary drum screen.

Mostly, it depends on the actual size and design construction of the rotary drum screen you are purchasing.

In essence, some of these equipment are quite large; thus, it becomes only practical when assembled onsite.

Otherwise, you can find relatively compact rotary drum screens, which are always assembled at the factory.

Thus, the decision to assemble the rotary drum screen on-site or at the factory is entirely based on its precise size.

 A Rotary Drum Screen Can Be Assembled On Or Off Site Depending On Size

• The efficiency of this equipment is dependent on the inclination angle. This can be disadvantageous, especially if you hardly understand how to incline this equipment, particularly when frequently replacing it.
• Solid materials passing through the drum screen tend to stick and build-up, leading to less efficiency due to clumping and sticking of such materials.

Apart from rotary drum screen, FilSon offers a range of filtration systems including DSM Screen, intake screen, wedge wire screen, and well screen, amongst others.

Contact us now for all your rotary drum screen needs.