This pressure will depend upon:

1. Pressure drop in the pipeline

2. Pressure drop across the distributor

3. Pressure drop across the bed

I will be glad to calculate these for you if sufficient details of the air slide are provided.

Amrit Agarwal

Consulting Engineer

Pneumatic Conveying Consulting

Email: polypcc@aol.com

Ph and Fax: 304 346 5125 ■

An engineer would ask what is a Newton metre cubed per square metre. Surely its a Newton metre. It is always better to clarify what you're torqueing about.

i.e. get your units right.

But to save yourself the worry why don't you just agree with the fan supplier to exchange your pulleys until you get into the right zone & do a bit of throttling till you get it spot on......Because that's what you'll finish up doing anyway..throughout the life of the plant. It's Normal practice!!!!

You want to move powder with air? The answer, my friend, is blowing in the wind. Or will be. ■

Originally Posted by louispanjang

..why don't you just agree with the fan supplier to exchange your pulleys until you get into the right zone & do a bit of throttling till you get it spot on......

This is the 21st century and you're messing about with pulleys

Fit the motor with an invertor ■

Originally Posted by louispanjang

An engineer would ask what is a Newton metre cubed per square metre. Surely its a Newton metre. It is always better to clarify what you're torqueing about.

Are you sure it is Newton metre and not normal metre, i always thought N was for volume at normalised conditions.

I agree with inverter motor solution but then are we killing good old mech. engg ?? "life is too easy these days". ■

The fan speed might be over the top of the suggested speed range.

Throttling locally will help to acheive balance across an, as yet, unknown manifolding arrangement.

In ISO nomenclature N most definitely stands for Newton(s). If someone wishes to say normal metres cubed than they should say so. Any tender quoting air flow in those units used above can be rejected out of hand because those units are meaningless in that context.

Tough yes, correct yes, more importantly it saves the Consultant's time if he can nit pick at first glance & bin a few on the first morning. ■

Originally Posted by Amrit Agarwal

This pressure will depend upon:

1. Pressure drop in the pipeline

2. Pressure drop across the distributor

3. Pressure drop across the bed

I will be glad to calculate these for you if sufficient details of the air slide are provided.

Amrit Agarwal

Consulting Engineer

Pneumatic Conveying Consulting

Email: polypcc@aol.com

Ph and Fax: 304 346 5125

Dear Mr. Amrit Agarwal

Thank you for article that you have sent to me.

best regards

Daryanto

Process Engineer ■

Originally Posted by louispanjang

An engineer would ask what is a Newton metre cubed per square metre. Surely its a Newton metre. It is always better to clarify what you're torqueing about.

i.e. get your units right.

I think that 1Nm3/m2*h=2,326SCFH... ■

Porvair Filtration Group manufactures fluidizing materials to distribute air flow. We can custom make the material to provide the required flow per square meter at the required pressure. We manufacture Sinterflo(R) porous plate out of sintered layers of stainless steel (or other alloy) mesh for high temperature applications. We also manufacture VYON(R) porous plastic which is easy to handle and is available in FDA compliant grades. Both the metal and plastic fluidizing materials are easy to cut, weld, mount and form into custom shapes.

More information is available by emailing infous@porvairfiltration.com . ■