Dilute or dense phase?

We recommend dilute or dense phase mainly on the basis of the product that is to be conveyed. In particular, dense phase operation (with its relatively low velocities) is usually preferable if the conveyed material degrades easily or is highly abrasive.

However, dilute and dense systems each have other attractions. For instance, both can readily deliver product to multiple destinations, via line diverter valves.

Dense phase conveying can handle high throughputs over long distances while requiring smaller line sizes than either dilute-phase or vacuum conveying. (In one typical installation, a dense-phase setup transports kaolin clay 700 ft through a 4-in. line.) Operating, labor and maintenance requirements are lower, because there are virtually no moving parts. And for fine, easily fluidized products, the power consumption is lower when operating in the dense phase.

A drawback of the dense phase option is that a transporter is required at every product-input point. Furthermore, except in arrangements where two transporters are provided in series or parallel, dense-phase conveying is a batch process, which is less convenient for most chemical process operations than is the continuous mode used by dilute phase and vacuum systems. And compared to the rotary air lock feeder used in dilute phase conveying, a dense phase transporter is a relatively complex device.

Because they are more energy intensive, dilute phase systems can handle a wider range of bulk products than can dense-phase systems. And, they tend to have a lower capital cost than either dense phase or vacuum systems. One reason is that dense phase systems usually entail ASME Code pressure vessels. Furthermore, vacuum systems require larger line sizes, as well as vacuum production equipment.

Our state-of-the-art test facility will provide definitive answers for your most cost effective pneumatic conveying equipment choices. We can simulate real world conveying environments, using the material you supply, and provide you with detailed performance reports and equipment recommendations.

Dilute Phase Overview

Dense Phase Overview

Frequently Asked Questions

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