Benefits Of Rotary Lobe Pumps - Part 1

The lobe pumps are very efficient devices that are used in many different industries such as: chemical, beverage, pulp and paper, food industry, biotechnology, pharmaceutical and many other sectors. High sanitary qualities, high efficiency and effectiveness, corrosion resistance, greater reliability and many other unique characteristics is what makes the rotary lobe pumps to be so widely used across diverse industries. The rotary lobe pumps have the capability to efficiently handle different kinds of fluids, and also slurries, pastes and solids. They are non contacting devices and come with large pumping chambers. The large pumping chambers give the lobe pumps the capability to handle different kinds of liquids. When the rotary lobe pump is wet, it offers self priming performance. The gentle pumping action of the lobe pumps minimizes the degradation of the product. These pumps also provide continuous reversible flows, and have the capability to operate dry for some period of time. The rotary lobe pumps range from industrial to sanitary lobe pumps. The sanitary lobe pumps are classified further depending on the service provided and the sanitary requirements. The following text will highlight what are the main benefits of the rotary lobe pumps and how they work.

Like the PC pumps, or progressing cavity pumps, the rotary lobe pumps are classified and belong to the pump family, known as positive displacement pumps. Their compact design makes them to be widely used for high discharge rates. The rotary lobe pumps are similar to the gear pumps because the fluid flows inside the interior of the casing. But however the rotary lobe pumps don't make any contact like the gear pumps. Special external timing gears placed in the gearbox is preventing lobe contact. The pump shaft support bearings are placed in the gearbox, and because the bearings are out of the liquid that is being pumped, the pressure is somehow limited by the bearings location and the shaft deflection.

Because they belong to the positive displacement pump family, the rotary lobe pump operates by capturing certain amount of liquid from intake pump, and then pushing the liquid through a discharge pump. How they operate can be explained by four simple steps:

• First the fluid enters into the lobe pump. In order to transfer the liquid, the lobe pump uses helical lobes which are placed on parallel shafts. The shafts rotate by timing gears.
• Next, the fluid fills the interior and the cavities of the lobe pump. The liquid flows into the cavity and it is being trapped by the lobes of the pump as they rotate.
• The liquid then moves through the interior of the pump. But the liquid which is being pumped out doesn't move between the lobes.
• Finally, the lobes force the liquid out of the lobe pump under pressure. The amount of the fluid that is being pumped out can be different depending on the speed of the rotary lobe pump. 

Continue to part 2...

How Hydraulic Cranes Work?

What Are Hydraulic Cranes?

Hydraulic cranes are the most powerful lifting machines and are used to lift and move the heaviest materials. Generally speaking, all the cranes are equipped with ropes, chains, sheaves and a winder, and the hydraulic ones use fluid power to enable them to lift heavy loads and materials. They are flexible machines and are used in the construction industry, but also in manufacturing and transportation industry. Their design might be simple, but they can perform the most difficult tasks that would with any other machine seem impossible. The hydraulic cranes are amazing in terms of strength and agility, so their presence on any construction site should not surprise you.

How They Work?

Hydraulic cranes are also called hydraulic truck cranes, because the crane is mounted on a truck's chassis. These machines are very easy to operate with and very simple to maintain as well. Hydraulic cranes' work on a straight-forward way: hydraulic fluid is transmitted throughout the crane to hydraulic motors and cylinders. The hydraulic cranes have hydraulic system, which works with a system of pumps and pistons filled with liquor. By harnessing the strength that liquor under pressure gives, hydraulic cranes have the ability to lift enormous amounts of weights, up to hundreds of tons. The hydraulic fluid is usually petroleum oil with various additives added. The pressure is created per requirement and the flow of hydraulic liquid is regulated by control valves.

Advantages

The main advantage of hydraulic cranes over the other cranes is that any applied force will propagate through the liquid, without big loss of strength, or simply said, the force transmitts through the fluid from one to another point. The purpose of hydraulic systems is to acquire mechanical advantage and increase the initial force significantly. For this purpose, most hydraulic cranes use non-corrosive oils. To operate at maximum efficiency with a hydraulic crane, there should be no trapped air bubbles in the fluid. Otherwise, some of the input force can be wasted squeezing air.

Safety Precautions

A hydraulic crane should be operated by a trained crane operator. The operator must know all the controls of the machine he is using, but also have some knowledge of the hydraulic system. The command issues are translated into the motion of a wide array of actuators. Hydraulic cranes are used because they are capable to lift large amounts through flexible hoses and small tubes. Many crane accidents happen every year, mostly due to the electrocution and equipment failure. But for safety precaution, they should not be operated by people who don't have any knowledge and experience with cranes in order to prevent crane accidents.

Different Types Of Bricklaying Tools

Bricklaying tools and equipment are used for various aspects of masonry work. The bricklayer tools are supposed to provide comfort grips, a great performance and have a long life spans. There is a wide range of bricklaying tools and bricklaying equipment and they can be grouped in a few basic categories, such as hammers, joint tools, trowels and string lines. In those categories all the bricklaying tools can belong: trowels, hawks, ladders, saws, spirit levels, cement mixers, stirrer drills, brick bolsters, groovers, edgers and all the rest. Whether for large or small construction project, bricklayer tools and equipment are suitable. Of all the tools, here you can read a few sentences about the most used tools in the masonry works.

Brick Trowel – The brick trowel is the largest tool of its family and it is used to pick up and spread mortar on bricks. The usual brick trowels are about 30 centimeters in length and have two long edges, either straight or with a slight curve.

Brick Hammer – The brick hammer has a specific design and it is meant for dressing bricks and other masonry materials. This hammer in shape of chisel can be used for chipping away sections of masonry.

Line Blocks – The masons need to position their guide lines and that is best achieved with the help of these L-shaped blocks, usually made of plastic or wood. The line blocks have a continuous slot at one end which holds the string line in place. The other end of the line block lips around the end of the wall.

Rubber Mallet – Rubber mallet is a hammer made of rubber and it is used to knock slabs, blocks or other heavy masonry materials. The rubber mallet causes little or no damage at all to the surface, even if a hard impact is applied.

Brick Jointer – They are a key component of any kind of masonry work, not only because they are integral to the structure of the wall, but brick jointers are also a part of the design. Many consider that jointers are only used for new pointing, but different thicknesses allow different joint depths.

Line Pins And String Line – A string line is a very important bricklaying tool as it enables the bricks to be leveled straight and level. They are help in place with line pins, steel pins that are pushed into drying mortar joints at the opposite ends of the wall. Then, the string is tied between the line pins and forms a guide line.

Australia Most Famous Buildings

Australia is one modern country that has some of the most amazing architectural structures that can be found in the world. The liberal and free spirit of the Australians can be seen in some of their marvelous buildings across the continent. Many of these amazing buildings have an iconic status, are known worldwide, and each year millions of tourists from different parts of the world are regular visitors. Some of them are : the Sydney Opera House, the Sydney Harbor Bridge, the Sydney Olympic Stadium, the Sydney Maritime Museum, the Sydney AMP Tower, the Shrine Of Remembrance, the Australian War Memorial Center in Canberra and many other similar iconic and amazing Australian buildings and structures.

Sydney Opera House. Probably the most visited building structure in Australia every year is the Sydney Opera House. This amazing man made architectural structure is not only the most recognizable Australian landmark all over the world, but it is also in some way a synonym to Australia and to its people. The amazing design of the Sydney Opera House represent an architectural wonder. With its marvelous sail like enormous arches, the Sydney Opera House proudly represent Sydney and Australia just like the Colosseum represent Rome and Italy, and just like the Eiffel Tower represents Paris and France. For its construction the most advanced Australian construction equipment was used. The Sydney Opera House was designed by the Danish architect Joern Utzon, and for his amazing creation he was rewarded with the Pritzker Prize. Queen Elizabeth II opened the Sydney Opera House in 1973, and since than the Opera House is the largest and busiest venue in the world with around 2500 artistic performances including theatre performances art exhibitions and music concerts. It has an average audience of around 2 million each year. It has been reported that around 200 000 people each year visit the Opera House like a tourists. The Sydney Opera House is also recognized as a World Heritage Site and it is protected by UNESCO.

The Sydney Maritime Museum. The Sydney Maritime Museum is another amazing building that has earned the reputation of being an architectural state of art structure in Australia. The designer of this marvelous building was Philip Cox Richardson. Again here for the construction of this beautiful building the most advanced construction equipment in Australia was involved. What makes this building to be so special are the amazing earthbound displays, the sequence of different structures that look like ships, the beautiful fabric rooftops and of course the incredible underwater walkways.

The Sydney Harbor Bridge. The Sydney Harbor Bridge is probably the most massive steel made bridge in the world ever made, along with the Golden Gate Bridge in San Francisco. The highest point of the bridge is around 134 meters above the sea level. The bridge has been constructed in 1932, and since than it stands as one beautiful architectural marvel. Every year thousands of visitors visit the Sydney Harbor Bridge where they get a chance to climb to the top of the bridge and to experience the most amazing and spectacular views of the Sydney harbor.

Sydney AMP Tower. The Sydney AMP Tower, or the Centerpoint Tower, is a one tall tulip shaped building that stands above all other buildings in Sydney. With its 300 meters in height, the Sydney AMP Tower is the tallest building in whole Sydney and beyond. It was constructed in 1981. The AMP Tower is equipped with high speed elevators that can take tourists to an unforgettable 360 degrees observation around Sydney. At the top of the tower there is a restaurant, and this restaurant is placed on the highest point in the Southern Hemisphere.

The Sydney Olympic Stadium. Another beautiful and amazing structure in Sydney is the Olympic Stadium. The stadium was completed in 1999 with a cost of around $690 millions. It was specially designed and constructed to host the 2000 Olympic Games in Sydney. It has capacity to host 110 000 spectators. Today the Sydney Olympic Stadium is used for various sport games, open concerts and for many other performances.

History Of Wheelbarrow

A wheelbarrow is a tool that serves as a carrier on one wheel and a tray bolted to two handles and two legs. While mostly known as a carrier for small loads for home-use, the wheelbarrow finds its use in the construction industry as a bricklaying equipment for carrying larger loads. The wheelbarrow is a yard tool we use it on a daily basis, but it surely holds a distinctive position in the history of tools.

Chinese Wheelbarrows

The very first record of a wheelbarrow directs on Chuko Liang, a general who invented a device for transporting injured soldiers and military supplies in A.D. 200. This wheelbarrow had only one wheel with a 1.2 metre diameter and was positioned on the center. The first Chinese wheelbarrows were huge and were able to load and carry much heavier, larger loads, and even people. However, many historians say that general Liang invented the wheelbarrow as a two-wheeled handcart for carrying vegetables, fruits, rice, etc. Back in 1000 B.C., the two-wheeled handcarts were very familiar to all in the East and West. These type of handcarts were soon modified into the wheelbarrows as we know today. Liang re-designed his invention into one-wheeled device that was much easier to transverse narrow trails. In China, the wheelbarrow is known as a wooden ox and gliding horse.

European Wheelbarrows

The first use of a wheelbarrow in Europe was very likely in the agriculture, spreading to construction, transportation of bricks, mining and goods. The first European wheelbarrows were able to carry only small loads over short distances, which is very different from the Chinese ones. Historians say that there is evidence of European wheelbarrows documented in Chartres Cathedral of France dating from 1220. There is also a medieval manuscript from 1286 that shows a longer and more curved European wheelbarrow than the modern one. The European re-designed the wheelbarrow and moved the wheel out in front, which meant that the load was supported by the pusher also, not only by the wheel.

Today's Types Of Wheelbarrows

Nowadays, there are many types of wheelbarrows, depending on the application. Those who do not need to use wheelbarrows as bricklayer tools, for various gardening tasks, plastic or lightweight aluminum wheelbarrows are suggested. Professional gardeners and nurseries need wheelbarrows with durable stee handles and pneumatic tires for easier maneuvering. Those who use wheelbarrows as bricklaying tools, should get the ones made of high quality and durable material in order to carry heavier loads. The latest innovation that is becoming increasingly popular among farmers and gardeners, is the power-assisted wheelbarrow.

Everything You Need To Know About Plate Compactor

Many types and models of heavy or lightweight construction machines can be seen at every construction site. One particular machine that has gained its popularity due to its functionality over the recent years is the plate compactor. A simple explanation would be that a plate compactor is a construction machine that is generally used for compressing soil or gravel of different kinds. Preparing site for laying stones or pavers, tamping the ground to get the proper density for a concrete layer, compacting and finishing freshly applied asphalt, compacting and finishing potholes... these are just some of the many construction tasks for which the plate compactor can be used. The plate compactors are very functional and versatile machines which are heavily used by professional construction workers for completing difficult tasks, and by homeowners for more easy backyard jobs.

Different types and models of plate compactors can be found on the market depending on the construction task. Mostly used types in the construction industry are the small vibratory compactor, the reversible plate compactor, the roller compactor and the “Jumping Jack” compactor. The vibratory plate compactor is ideal for creating a level grade. The Jumping Jack compactor is mainly used for compacting the soil in narrow trenches when gas or water pipes are being installed. For compacting crushed rocks and creating smooth layer for concrete or stone foundations, the roller compactors are the first choice. Although each type has its own unique characteristics and it is used for a particular task, generally they all come with one heavy steel plate mounted to the base of the plate compactor. Depending on the model, the plate compactor is capable to provide different amounts of vibratory force for efficient earth compaction. Therefore, the bigger the plate compactor, the bigger the force it produces on the ground. These compactors generally come powered either by electric, hydraulic or gasoline motors.

For many earth compaction tasks few construction machines are as versatile as the plate compactors. The plate compactors apply force on the ground by their weight. They are heavily used for preparing the ground surface for applying asphalt or concrete. The type and the size of the construction job, and also the type of the material that is being compacted will determine which model is needed for proper compaction. A lightweight plate compactor is easy to control and maneuver. The heavy weight plate compactor can compact the ground faster but may require greater effort for maneuvering on the ground. The level of the moisture in the ground also determines which plate compactor to be used, because the moisture content affects the compaction process. When aggressive ground compaction is required, or when compacting trenches, more powerful rammer would be an ideal solution.

The selection of the plate compactors need to be based on the value and on the functionality provided, not on the price. A less expensive plate compactor may not deliver the desired results. On the other hand, more expensive plate compactor can be very difficult for maneuvering and it would waste more time. Check online for additional specifications and information about available plate compactors for sale.

Click here if you want to see new and used plate compactors for sale.

History Of Road Rollers

Road rollers are very important machines in the construction industry, as they can compact soil, gravel, concrete, asphalt and any other surface. Generally all road rollers are consisted of a roller body and one metal drum at least. There is not only a single drum roller, but depending on the application, the road rollers might be twin drum roller (or also called double drum roller compactor) or with three drums.

Like any other construction tool and equipment, the road roller is a witness of many inventions in its history. The very first road rollers were drawn by horse and there were no such on sale, just for loan. At the beginning, the road roller was an agricultural tool used to flatten land and break up large clumps of soil. The land flattening was needed to make subsequent weed control and make the harvesting much easier, while the rolling helps in reducing the moisture loss from cultivated soil. At these distant times, without developed mechanization and trucks, the road roller was driven not by an engine, but by a group of animals, usually horses. But when it came to the 19^th century, the road roller find its use in building roads compacting asphalts.

The disadvantage of road rollers driven by horses was that the animals' capacity was limited and they were hard to control. So, in mid 1800s, the self-powered vehicles have replaced the animals' power, known as steam rollers. Most steam rollers are very similar to traction engines, because many traction engine manufacturers produced rollers based on their existing designs. The main difference between these two vehicle is that on the road roller the main roll replaced the front wheels and axle, in order to be able to fit to a traction engine. Since carrying weight became larger and easier to control with the steam rollers, their popularity was huge and world-wide, as some road companies in the United Kingdom kept them in service until the early 70s.

But the fast improving technology has affected the road rollers in the 20^th century and replaced the steam with gasoline, diesel and kerosene engine. The first internal-combustion powered road rollers were similar to the steam rollers, because they used very similar mechanisms to transmit the power from the engine to the wheels. Many companies did not like them from the beginning, mainly because their engines were very difficult to start (especially the kerosene powered engines). As a consequence, today all road rollers are powered by diesel engines. Today's road rollers have been improved a lot and are much more efficient.

Nowadays, there are many types of rollers available on the market: padfoot roller, smooth drum roller, static roller and many other types. Depending on the use and need, you can choose various hand-operated and powered rollers.

How To Deal With Mud Problem When Compacting Soil

Wet construction site can be a major problem for every residential or commercial building construction project. Wet soil and mud on the construction site can cause significant headache to the construction engineers and building contractors. Snow and rain can cause the ground to become wet and muddy. Furthermore wet soil can be a challenge for efficient compaction and for building stable foundations. No matter what type of dirt compactors are used, the end result will not be satisfactory. Clearly for one construction project to be considered as a success, dry soil and solid foundation is mandatory. But the natural process of drying the wet and muddy soil generally takes time and it is regularly interrupted by the unpredictable rain showers. Because of this the work on the construction site is delayed continually. The investor and the contractors lose not only time but also money.

Lime is considered by many construction workers and engineers as the ideal solution for drying and preparing the soil for construction. Lime effectively and quickly dries mud and wet soil, and also prepares the ground by providing solid base for the construction traffic. Lime minimizes the plasticity of wet and muddy soils, it makes the soil to be more friable, and also on the other hand increases the compaction characteristics of the soil. In short, the lime makes the soil to be ideal for the construction process.

There are three basic steps that need to be followed when lime is applied to the soil : spreading the lime, mixing soil and lime, and in the end the compaction process. Big pneumatic construction vehicles and tankers are used for transporting the lime to the construction site. Then special spreader vehicles are used to spread the lime. These vehicles are equipped with specially designed mechanisms which control the quantity of lime that is spread into the soil. For small construction projects usually a small crawler dozer is used to spread the lime over the soil. How much lime is needed is determined by conducting tests on the soil. A rotary mixer is used for mixing the soil and the lime to get a certain layer or depth. Deeper layers or depths are required in situations when spongy or wet areas appear on the soil. Sometimes certain amount of water is added if the level of hydration needs to be increased. When the lime is appropriately mixed with the soil, it absorbs the extra moisture and breaks down larger pieces of clay. This absorbing and breaking period usually last around 24 hours, depending on the type of lime that is used. The compaction of the soil is usually done by using dirt compactor or sheepsfoot roller compactor. The dirt compactor is a special machine which is used for achieving proper compaction on the soil. A single or double drum compaction roller is also used for soil compaction. Proper compaction is essential for higher moisture resistance and for higher strength.

Lime has three impacts on the soil : drying the wet and muddy soil, soil modifications and higher soil stability. Although all three are beneficial, clearly drying the soil and the soil modifications are the most important for the construction engineers and contractors. When the soil is too wet and muddy for effective compaction, mixing soil and lime can result in :

• Water being absorbed from the soil. The lime has ability to absorb as much as 40% water from the soil
• Higher hydration
• Changes in the soil characteristics in terms of providing optimum level of moisture for proper compaction
• Lowering the plastic index of the soil. The low plastic index contributes positively to the compaction process

What do you need to know about rammer compactors?

What is a rammer compactor?
A rammer compactor is a mobile, compact and hand-guided machine, which is capable of quick working by applying force in consecutive impacts to the soil, in order to drive out water and air from the soil and increase the soil's dry density with moisture. The engine of the rammer compactor sits on the top of a column which drives a foot up and down at high speed with a lot of force. Where a big soil compactor can not access on a certain area, a wacker rammer is obviously an ideal solution and can perform the same job equally good.


The rammer compactor, or also called jack tamper, is an indispensable piece of equipment in the construction industry. Whenever a soil needs compaction at ground level, the jumping jack compactor finds its place, whether on small jobs or trenches. Rammer compactor is called by a few names, such as tamping rammer, jumping jack tamper, wacker rammer, trench rammer, jack tamper, jumping jack compactor, vibro-tamper and many others. Each might have a few differences, but in general, they are all the same and have same use.


The amount of needed compaction depends on a few factors, including how much the soil has been disturbed during excavations, the moisture content and the composition of the ground. If the soil is being used for back-filling, the compaction should be performed in layers. These layers are called lifts and each lift's depth depends on the material. Deeper lifts require more passes with the jack tamper, so consider the time spent on compaction compared to the time spent moving material.


Important factors
Rammer compactors are very easy to operate and perform compaction very efficiently. Factors that indicate a good tamper rammer are:

• It does the job well and maintains the productivity;
  
• It is easy to operate and comfortable, even for long a period of use;
  
• It is easy to maintain.
  

How to use a wacker rammer

Learning how to use a wacker rammer can last for a few minutes only. Place the machine on the soil to be compacted, wait for a few minutes for the engine to warm up and start working. Stabilizing the rammer when it reaches the full speed might take a while, but everything will run smooth once the rammer is stable in hands. The trick to setting the rammer in motion is not about hard and physical pulling and pushing. Tilt the machine forwards slightly and once it begins to move, let it right itself and when it stops, tilt it back and it moves back.

3 benefits of Starting An Ice Cream Business

3 benefits of Starting An Ice Cream Business