Manual Cema

ANSI /CEMA 350-2009 A Revision of ANSI / CEMA 350-2003 (Approved: April 1, 2009)

CEMA BOOK NO. 350 Third Edition

SCREW CONVEYORS for Bulk Materials

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CONVEYOR EQUIPMENT MANUFACTURERS ASSOCIATION

NOTE: The ISBN for the E-Book Version of the Hard Copy is ISBN 1-891171-58-5. Other than that both books are identical

978-1-891171-58-1

THIS DOCUMENT HAS BEEN DEVELOPED ANDMAINTAINED BY MEMBERS OF THE CEMA CEMA SCREW CONVEYOR PRODUCT SECTION It is provided as a service to the Bulk Handling Industry Refer any comments to CEMA HQ

For a current list of Screw Conveyor Section companies, visit CEMA’s web site: www.cemanet.org.

CEMA ORGANIZATIONAL CHART
COMMITTEES BOARD OF DIRECTORS OFFICERS

Conference Finance and Budget Strategic Planning Insurance Meetings PastPresidents Marketing / Membership Bulk Handling Components and Systems Screw Conveyors

Meet in March and/or September
General Bulk Handling Section Unit Handling Conveying Section

Bulk Accessories

Controls

Conveyor Chain

Palletizers

Meets Each June
Engineering Conference Accessories Idlers Committees Pulleys Screw Conveyors Belt Systems Belt Manual Safety Controls Terms andDefinitions International Standards

Statistics Conveyor Chain Performance Terminology Unit Handling Standards Unit Handling Section Bulk Handling Section

For Information on Company Membership visit the CEMA Web Site at http://www.cemanet.org

Prepared by the Screw Conveyor Engineering Committee of the Engineering Conference

Conveyor Equipment Manufacturers Association

Screw Conveyors forBulk Materials
CEMA Book No. 350 Fourth Edition

Fourth Edition - 2008 Third Edition - 2000 Second Edition - 1980, 1983, 1990 First Edition - 1971, 1975

Published by the Conveyor Equipment Manufacturers Association
6724 Lone Oak Boulevard Naples, Florida 34109 USA 239.514.3441 FAX 239.514.3470 www.cemanet.org

Copyright © 2008 by the Conveyor Equipment Manufacturers Association. All rightsreserved. This book may not be reproduced in any form without written permission from CEMA. Printed in the United States of America
ISBN 978-1-891171-58-1

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Safety Notice

The Conveyor Equipment Manufacturers Association (CEMA) has developed industry Standard Safety Labels for use on the conveying equipment of its member companies. The purpose of the labels is to identify common anduncommon hazards, conditions, and unsafe practices that can injure, or cause the death of, the unwary or inattentive person who is working at or around conveying equipment. The labels are available for sale to member companies and nonmember companies. A full description of the labels, their purpose, and guidelines on where to place the labels on typical equipment, has been published in CEMA’s SafetyLabel Brochure (No. 201). The brochure is available for purchase by members and nonmembers of the Association. PLEASE NOTE: Should any of the safety labels supplied by the equipment manufacturer become unreadable for any reason, the equipment USER is then responsible for replacement and location of these safety labels. Replacement labels and placement guidelines can be obtained by contacting yourequipment supplier or CEMA. A VHS safety instruction tape, entitled Screw Conveyor, Drag Conveyor, and Bucket Elevator Safety Video, has also been developed by the CEMA Screw Conveyor Section. It describes key safety practices people should adhere to when working with and around these different conveyors. It is available for purchase from CEMA.
NOTE: Some pictures and diagrams of screw conveyors inthis book are without covers or have exposed screws or shafting and are for illustration purposes only. Conveyors should never be used without covers, guards, or protective equipment.

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Contents

CHAPTER 1 Screw Conveyor History and General Application

1 Screw conveyor history. Discussion of application of screw conveyors. Data needed in preparation of screw conveyor design....