York, UK -- Portasilo have developed a pressure relief valve to comply with the guidelines issued by the HSE in the recent publication Guidance to prevent Over-Pressurization of storage silos during the delivery of powder.

They have developed the relief valve as the existing valves on the market do not fully comply with the guidelines with regard to the maximum airflow requirements and the need to keep the combined set pressure and pressure accumulation below the safe working pressure of the silo.

Model PRV350 combined pressure and vacuum relief valve is designed for protection of silos from damaging over and under pressures encountered during filling and emptying. The valve, which is capable of venting 13,000 m³/ hour in an over pressure situation and 5,000 m³/ hour under vacuum has been fully tested and certified with airflow's in excess of 13,000 m³/ hour under controlled conditions witnessed by the HSE.

The valve is available in a number of different materials and gasket combinations for a wide range of applications and industries. A range of upstands and adapters is also available for new and retrofit applications.

(Editors note:  After hearing about silo collapses, buckling and denting, this is a topic of interest to most of us.  Portosilo has a very interesting streaming-media video clip of their vent in action available on their web site, here is the link:  http://www.portasilo.co.uk/prvframe.htm )

For further information please contact:
Mr. Ian Birkinshaw
Portasilo Ltd.
York, UK
Telephone:  44-01904 -624872
Email:  Ian.Birkinshaw@portasilo.co.uk
Web site:  http://www.portasilo.co.uk/

Charlotte, NC -- Spiroflow has recently designed and manufactured a USDA-approved Flexible Screw Conveyor for product applications in the food, chemical, plastics and other industries.

The USDA Dairy Accepted/3A Authorized model allows the operator to use for diverse applications. The system's UHMWPE tube and steel spiral can be easily disassembled and cleaned with little downtime to reduce product contamination when moving and switching products.

The conveyor is easily controlled with an integrated pre-programmed PLC or by existing facility controllers. The conveyor, featuring locking swivel wheels for stability, is easy to maneuver, especially in tight facility locations.

Spiroflow offers a number of different tube diameters and lengths to accommodate required rates up to 100,000 cubic feet per hour. The FSC is favored by many industries including chemical and food where there is often a need for multiple applications.

Spiroflow is a manufacturer of dry bulk material handling equipment, specializing in bulk bag discharge and filling systems, flexible screw, pneumatic and aero-mechanical conveyors.

For more information about contact:
Spiroflow Systems, Inc.
Telephone:  704-291-9595
Fax 704-291-9594
Email:  info@spiroflowsystems.com

Kenilworth NJ -- The cutting blades of the new Flow-Sentry In-Line Crushers intermesh with a series of stationary bars to crush and break oversize chunks into a consistent, free-flowing material to prevent line blockages and make downstream operations more efficient.

Also, it increases the available product surface area which allows reactive processes (mixing, melting, dissolving, etc.) to occur more quickly and completely.

The extremely low profile design, as little as 2-inches, in some cases, of this patented crusher makes installation into existing systems easy. For example, the Flow-Sentry can be installed in vertical or horizontal pipelines from 2" to 20" diameter and is suitable for gravity, liquid or pneumatic (dry powder) systems. Most materials of construction and numerous design options are available.

Atlantic Coast Crushers manufactures and sells crushers, lumpbreakers, lump breakers, pulverizers, granulators, comminutors and other size reduction machinery for the process industry. They specialize in designing crushers and lumpbreakers, machinery that uses impact to shatter chunks, lumps, and agglomerations formed from friable materials.

For more information contact:
Mr. Jim Herdman
Application Engineering
Atlantic Coast Crushers, Inc.
Telephone:  908-259-9292
Email:  info@gocrushers.com
Web site:  http://www.gocrushers.com/

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People post their requests for help and offer their suggestions to others in our open forum.

Mr. Randall wants to grind up uncured rubber:

I have been told that you need a granulator that can be chilled or water cooled to grind uncured EPDM rubber.  If that is the case, I will need to have the material ground somewhere else in the Southeast USA.  Any ideas?
(Click here to post a reply)

Brian Randall
C&A Floorcoverings, Inc.
brandall@powerbond.com

Mr. Shangxi needs help with hopper fluidization:

I have a question about fluidization of big through hopper under ESP. The big through hopper is for 2 fields of ESP2. The dimension of interface with ESP is almost 14.5mX5.6m, but the bottom of hopper is inclined with 11 degree angle and the width is 0.4m. The front height of hopper is almost 10m, the behind height of hopper is almost 6m.

We presume the level of dust is almost same horizontal. we provided fluidizing air for the chutes which is at the bottom of hopper to fluidize the dust in the hopper. The air ratio is 2m3/m2/min and roots fans' outlet pressure is 40kPa.

We wonder if the height difference between the front and the behind can cause bad fluidization. we wonder if the air will get into the dust or just pass though from the behind part and blow the dust back to the ESP2.

Is there any problems with the fluidizing proposal?

Please give your answer to my email (Click here to post a reply)

Regards,
Wen Shangxi
Kaidi
w_shangxi@hotmail.com

Click here to share your expertise with others in our Help Forum.

TOLLING SERVICES: Custom Micronizing Available
Custom Processing Services is a contract manufacturer/toll processor specializing in micronizing ultra-fine particle-sized materials for use in a wide range of products, including chemical powders, waxes, polymers, flame retardants, minerals, metals, fillers and pigments.

Food-grade 21 CFR 110 processing is also available. Wet media milling by CPS can achieve particle sizes in the nanometer range. Blending, coating and compounding services, plus custom packaging, allow CPS to ship materials processed to customer specifications.

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List your equipment and/or services in our e-Classifieds.  Its quick, simple and you can pay by credit card!.  You can even include a photograph with your ad!  And get your e-Classified ad featured in next week's newsletter!

We now accept all major credit cards

Sales Positions Available - Particle Technology

SYMPATEC Inc - Systems for Particle Technology is in a growth phase having introduced new instruments for laboratory and in-line particle size and shape analysis.

We are looking to add regional sales managers for the US market.  If you are interested in working for Sympatec in the South-East, West Coast or Central-South (Texas)

Please send a resume to:
Vice President
Sympatec Inc.
PO Box 7527
Princeton NJ 08543

or e-mail to USA@sympatec.com

Visit our web site at www.sympatec.com for information on our company and products.

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© 1999-2003 Powder and Bulk Dot Com
Home page:  http://www.powderandbulk.com/

Joseph Taylor, Editor
Powder and Bulk Dot Com Newsletter
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Jacksonville Beach, FL 32250

Phone: 904-280-4656
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Email:  jtaylor@powderandbulk.com

Powder and Bulk Dot Com's Newsletter is a 100% opt-in e-mail list of information for the materials handling professional.  Do you have company news, a new product, new service or other information you would like to share with our subscribers?  Please submit articles via e-mail, only to: news@powderandbulk.com

We had a big month in November with over 65,000 visitors!  This is up from October with 54,000 visitor.

Could a recovery be in the wind?  We have not seen this level of activity since before the Iraq war broke out...  What do you think?

Our goal is to provide information to improve your business by using the resources available on the Internet.

Thanks,
Joe Taylor, Editor
jtaylor@powderandbulk.com

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Fundamentals of
Packaging Technology
by Walter Soroka
Textbook Binding, 589 pages, 1998

.

Sands, Powders, and Grains:
An Introduction To the Physics of
Granular Materials
by Duran, Reisinger & Fujimoto
Hardcover, 314 pages, March 2000

.

Pneumatic Conveying
Design Guide
by David Mills, Ph.D.
Hardcover, 650 pages, December 2003

.

Find more books for the materials handling professional online, visit our Reading Room.

The Art of Blending 
and Blender Selection
- A Few Basics
Guest article by Clark A. Beebe, Technical Services Manager, Gemco

Past Ask Joe! Archived Articles

We Need Your
Guest Articles!
Do you have an area of expertise in bulk materials, have you solved a difficult materials problem? Share your knowledge with others and promote yourself by contributing an article to the Ask Joe! Column.  For more information, please contact Joe Marinelli.

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This week's homepage photo is of the new K-Tron Bulk Solids Pump (BSP).  The BSP uses positive displacement technology and a unique operating principle - the use of a product "lock-up zone" so that it smoothly conveys material from hopper storage to discharge.

Photo courtesy of Kathy Hunter of K-Tron Feeder Group

Send us your photos:  We would love to have your photo of a bulk materials process, packaging, conveying or handling "action shot" for our home page.  Send your photograph and description to: news@powderandbulk.com