API 11E - Specification for Pumping Units（为抽油机API 11 e -规范）.pdf

This document is not an API Standard; it is under consideration within an API technical committee but has not received all approvals required to become an API Standard. It shall not be reproduced or circulated or quoted, in whole or in part, outside of API committee activities except with the approval of the Chairman of the committee having jurisdiction and staff of the API Standards Dept. Copyright API. All rights reserved. API 11E - Specification for Pumping Units 5 Beam Pump Structure Requirements 5.1 General Requirements for beam pump structures are specified in the following sections. Only loads imposed on the structure and/or gear reducer by the polished rod load are considered in this specification. Polished rod load ratings are specified in API 11B. Additional loads on the beam pumping unit imposed by add-on devices (such as compressors and stroke increasers) attached to the reducer, walking beam, or other structural components are not covered by this specification. No dimensional requirements, other than stroke length, are given. 5.2 Design Loads for All Structural Members Except Walking Beams For all pumping unit geometries, and unless otherwise specified, the maximum load exerted on the component being considered shall be determined by examining the loads on the component at each 15° crank position on the upstroke of the pumping unit. The polished rod load, P R , shall be used for all upstroke crank positions. For units with bidirectional rotation and nonsymmetrical torque factors, the direction of rotation used for design calculations shall be that which results in the highest forces in structural components. Due consideration shall be given to the direction of loading on all structural bearings and on the structural members supporting these bearings. 5.3 De