_RP_11ER-2009_2020.pdf

Recommended Practice for Guarding of Pumping UnitsAPI RECOMMENDED PRACTICE 11ER THIRD EDITION,NOVEMBER 2009 REAFFIRMED,JULY 2020Recommended Practice for Guarding of Pumping UnitsUpstream SegmentAPI RECOMMENDED PRACTICE 11ER THIRD EDITION,NOVEMBER 2009 REAFFIRMED,JULY 2020Special NotesAPI publications necessarily address problems of a general nature.With respect to particular circumstances,local,state,and federal laws and regulations should be reviewed.Neither API nor any of APIs employees,subcontractors,consultants,committees,or other assignees make any warranty or representation,either express or implied,with respect to the accuracy,completeness,or usefulness of the information contained herein,or assume any liability or responsibility for any use,or the results of such use,of any information or process disclosed in this publication.Neither API nor any of APIs employees,subcontractors,consultants,or other assignees represent that use of this publication would not infringe upon privately owned rights.Classified areas may vary depending on the location,conditions,equipment,and substances involved in any given situation.Users of this recommended practice(RP)should consult with the appropriate authorities having jurisdiction.Users of this RP should not rely exclusively on the information contained in this document.Sound business,scientific,engineering,and safety judgment should be used in employing the information contained herein.API is not undertaking to meet the duties of employers,manufacturers,or suppliers to warn and properly train and equip their employees,and others exposed,concerning health and safety risks and precautions,nor undertaking their obligations to comply with authorities having jurisdiction.Information concerning safety and health risks and proper precautions with respect to particular materials and conditions should be obtained from the employer,the manufacturer or supplier of that material,or the material safety datasheet.API publications may be used by anyone desiring to do so.Every effort has been made by the Institute to assure the accuracy and reliability of the data contained in them;however,the Institute makes no representation,warranty,or guarantee in connection with this publication and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any authorities having jurisdiction with which this publication may conflict.API publications are published to facilitate the broad availability of proven,sound engineering and operating practices.These publications are not intended to obviate the need for applying sound engineering judgment regarding when and where these publications should be utilized.The formulation and publication of API publications is not intended in any way to inhibit anyone from using any other practices.Any manufacturer marking equipment or materials in conformance with the marking requirements of an API standard is solely responsible for complying with all the applicable requirements of that standard.API does not represent,warrant,or guarantee that such products do in fact conform to the applicable API standard.All rights reserved.No part of this work may be reproduced,translated,stored in a retrieval system,or transmitted by any means,electronic,mechanical,photocopying,recording,or otherwise,without prior written permission from the publisher.Contact the Publisher,API Publishing Services,200 Massachusetts Avenue,NW,Suite 1100,Washington,DC 20001.Copyright 2009 American Petroleum InstituteForewordThis recommended practice(RP)is under the jurisdiction of the API Subcommittee 11,Subcommittee on Field Operating Equipment.It is intended that this RP provide a guideline for the guarding of moving parts of oil well pumping units.It is based on knowledge and experience gained through the application of guards for pumping units by the production segment of the petroleum industry over a period of many years.In preparing this RP,the group responsible has selected and extracted specifications and recommendations from the following publications:ANSI A1264.1:2007,Safety Requirements for Workplace Walking/Working Surfaces and Their Access;Workplace,Floor,Wall and Roof Openings;Stairs and Guardrails Systems and ANSI B15.1:2000,Safety Standard for Mechanical Power Transmission Apparatus.Metric(SI)conversions of and U.S.customary(USC)units are included throughout the text as parenthesized numbers.The following factors were used in making these conversions:1)inches(in.)were converted to millimeters(mm)by multiplying inches by 25.4,and rounding to one place to rightof decimal point;2)pounds per linear foot(lb/ft)were converted to kilograms per meter(kg/m)by multiplying by 1.448164 androunding to two places to right of decimal point;3)pounds(lb)were converted to kilograms(kg)by multiplying by 0.4535924 and rounding to two places to right ofdecimal point.Nothing contained in any API publication is to be construed as gr