Dear James,

To comment the proposed solutions and compare the new installations with your existing installation, the following, additional, information is necessary:

1)the compressor type (roots type blower or screw compressor with internal compression)

You mention “blower” (maximum pressure 0.8 to 1.0 bar, which could explain the larger pipe diameter)

2)Feeder system

Double pressure tank system or screw-feeder (FK pump)

3)What is the conveying length (horizontal and vertical) of the existing installation, what is the conveyed product,airflow and pressure?

A compressor should deliver oil free compressed air to a pneumatic conveying system.

The type of compressor (isochoric or adiabatic compressing principle) determines the energy consumption.

The choice of the compressor (Aerzen or Fuller or other) has to be made by yourself, based on quality, price, service and references.

Awaiting the additional information

Best regards

Teus. ■

Hi James,

Does it mean that on the existing pipeline that;

108 tons/hr cement is achieved on the 143m+43m 10"pipeline at 15 psi

and that ;

120 tons/hr FAB is achieved on the 107m+34m 10"pipeline at 15 psi

Br

Teus ■

Hi james,

I run the various installations through the computer and summarized the results in a word-file, which is attached as a zip-file to this message.

I hope that I understood your description right.

It is recommendable to investigate the performance of the existing installations thoroughly and base the design of the new installations on the derived pneumatic conveying properties of the cement and fly ash blend (I followed that procedure)

Then take into account the necessary air velocities (as low as possible) and pressure limitations of the FK pumps.

(Take in mind that a FK pump consumes approx 0.7 kW/ton conveyed)

Certainly a job for an experienced expert.

success

teus

Attachments

existing installation rj morrish (ZIP)

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Hi James,

When using a FK-pump system, the number of compressors is irrelevant for the system..

Or it must be for backup purposes. And even then it is easy to rent an oil filled, mobile screw compressor as used on a building site.

When using a double kettle system, one compressor could deliver air to the tanks and the other serves as a booster.

The minimum air velocity at a certain location in the pipeline should be 1.5 to 2 times the local suspension velocity.

As the air density in the beginning of the pipeline is high, due to the higher pressure, the local air velocity can be lower. The expansion of the convey air along the pipe line automatically increases the air velocity.

To prevent a too high air velocity (with the related too high energy losses) the pipeline diameter is stepped up.(not always done)

The consultant should make clear how the system, he offers, is designed.

Often, a consultant keeps that for himself for commercial reasons (you could compare with competitors and thereby revealing knowledge) but you will find out anyway when the system is built, although it might be too late then.

I have experience with Aerzen oil free screw compressors with internal compression and vane compressors.

The Aerzen compressors are to prefer over vane compressors as the latter are not oil free and more vulnerable to dirt.

An Aerzen compressor in pneumatic conveying is just a compressor block with a drive motor. (no auxiliary equipment around it)

Take care

teus ■