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Pneumatic conveying hoses for sale

Pneumatic conveying hoses are components to give careful consideration in terms of specification: the conveying ducts, inside which the air-material mixture flows, are equally important and need careful design, especially when abrasive substances have to be moved. They must be also carefully prepared for the route they will take.

Careful choices must be made about the material they are made of, their thickness, the most suitable finish for the inner surface and the type of elbows to be used. As well as supplying turnkey pneumatic conveying systems, Apply sells every type of pipe available on the market, from the simple straight pipe to the latest model of elbow pipe designed for a single type of material.

Pipe thickness

One of the main parameters to focus on for the correct operation of a pneumatic conveying system is the minimum velocity value that the air must maintain in the pipes. Going below this value, even slightly, can lead to a complete blockage of the system. This is where the quality of the tube processing becomes evident: if the internal diameter is not perfectly adherent to the specifications, along the entire length, you can run into major problems, despite the correct design made by the engineers. Our carpentry department can produce pipes of the highest quality, with fast service and also from your own drawing.

The pipe thickness and the material to be transported

The pipe thickness also influences the average life of the pipe and must be chosen appropriately, especially when the transport involves abrasive products. When the product to be transported does not have erosive characteristics, thinner pipes can be used, which are lighter and easier to install.

If the pipeline has to transport products characterized by very large particles, these will tend to “jump” along the pipe, as a result of the combined action of gravity and air drag.

If the material both abrasive and with large particles, then the result of this “hopping” will be a worn groove at the bottom of the pipe. Mild steel is particularly susceptible to this phenomenon, so it will be necessary to rely on thick pipes and, if needed, to periodically rotate the ducts.

Surface finishes for pneumatic conveying pipes

Many pneumatic conveying applications require specific surface machining of the pipes, both on the inner and outer wall. Our company sells pipelines with ready-made surface finishes for the most common uses and can also carry out surface finishes on request, even on your own pipes, in our carpentry department.

Internal surface finishes are usually required because of the resistance of friction to flow. Or for particular transported materials, such as polyethylene, they are necessary to reduce the problem of angelic hair or melting of material particles. In these cases, special processing to make the surface rough is indicated.


Elbows and bends

The pipes bends and elbows are essential to give the pneumatic conveying system flexibility through the routes to be taken, but they cause certain problems which must be taken into account at the design stage. Each bend makes a contribution to the overall resistance of the system and therefore to the air pressure required. The abrupt change of direction given by an elbow causes problems with friable substances and can generate angelic hair with synthetics.

From our company you can purchase bends and elbows in different materials and shapes, designed to minimize the mentioned problems. Among the materials we have bends and elbows in steel, cast iron, alloys, basalt, rubber, alumina and other materials. In terms of shape, conventional bends have a constant bore and radius, and others have been developed with specific characteristics for pneumatic conveying.

Types of elbows

For conveying abrasive substances, we sell the blind T-arm elbow, which is so effective that it can even be constructed from waste materials. The blind T-arm traps a small amount of the transported substance, so that the new substance arriving from the pipe collides with it instead that with the elbow, which is therefore protected. On the other hand, there is an increase in the pressure drop and some time must be spent periodically cleaning the blind arm.

A more advanced version of the blind T-arm is the Booth elbow. Here the blind part is slightly curved, so that the substance trapped in it can be easily purged; there is also a threaded plug for intervention in the event of a blockage.

Another version, which is even more resistant to erosion and degradation, has a spheroidal chamber in the blind arm. The trapped substance remains in constant swirling motion, providing a cushioning effect for the incoming substance.

The expanded bend elbow, on the other hand, is designed to protect both the pipe and the material. Both of these issues are significantly affected by velocity. With the expansion of a large part of the elbow the air velocity is reduced, as is the speed and impact of the substance against the pipe wall. The turbulence in the bend is so intense that even if the air velocity decreases, below the minimum value required, it is highly unlikely that a blockage will occur at the bend.

The range elbow, on the other hand, has been specially designed to minimize the problem of angelic hair formation that occurs with substances such as nylon and polymers when they slide along the inner surface of a conventional pipe.