Specification for Pumping Units. Licensed by Information Handling Services. American Petroleum Institute. Washington, D. Explorationand Production Department. Note: This section is not part of IS0

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Specification for Pumping Units. Licensed by Information Handling Services. American Petroleum Institute. Washington, D. Explorationand Production Department. Note: This section is not part of IS0 API publications necessarily address problems of a general nature. With respect to par- ticular circumstances, local, state, and federal laws and regulations should be reviewed. 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 under local, state, or federal laws.

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 data sheet. Nothing contained in any API publication is to be construed a s granting any right, by im- plication or otherwise, for the manufacture, sale, or use of any method, apparatus, or prod- uct covered by letters patent.

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This publication will no longer be in effect five years after its publication date as an operative API standard or, where an extension has been granted, upon republication. Status of the publication can be ascertained from the APT Authoring Department [telephone This document was produced under API standardization procedures that ensure appro- priate notification and participation in the developmental process and is designated a s an API standard.

Questions concerning the interpretation of the content of this standard or comments and questions concerning the procedures under which this standard was devel- oped should be directed in writing to the director of the Exploration and Production Depart- ment, American Petroleum Institute, North Pearl, Suite , Dallas, Texas Requests for permission to reproduce or translate a l l or any part of the material published herein should also be addressed to the director. API publications may be used by anyone desiring to do s o.

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AFT does not represent, warrant, or guarantee that such prod- ucts do in fact conform to the applicable API standard. Copyright O American Petroleum Institute.

Unit Structure Nameplate. Steel Gears-s,,. Gear Load Distribution Factor-C,. Bending Fatigue Stress for Through Hardened and. Tempered Steel Gears-s,,. Gear Load Distribution Factor-K,,,. Case Depth for Carburized Gears, he. Total Case Depth for Nitrided Gears, h,. Effective Case Depth for Flame or Induction. Hardened Gears, he. Flame and Induction Hardening Patterns. Unit Reducer Nameplate. Rating Form for Crank Counterbalances. Unit Stroke and Torque Factors. Unit Geometry.

Polished-Rod Position Data. D- 1-Pumping. E- 1-Rear. Crank Counterbalance. H- 1-Pumping. Unit Size Ratings. Used in Gear Rating Equations. Unit Reducer Sizes and Ratings. Allowable Contact Stress Number-sa,. Bending Fatigue Stress Number-sa,.

Strength Factor, K,. GSI Units. The complete text of both. Appendix G is not part of Specification 11E. This standard shall become effective on the date printed on the cover but muy be used voluntarily from the date of distribution. T43 W.

It does not cover chemical properties of materials, nor the use of the equipment. Pumping unit. Pumping unit structure. Pumping unit gear reducer. Pumping unit chain reducer. Pumping unit beam counterbalance. Pumping unit crank counterbalance. The symbols used in the pitting resistance and bending strength equations are shown in Table 3.

Note: The symbols and definitions used in this specification may differ from other specifications. Users should assure themselves that they are using these symbols and definitions in the manner indicated herein. This section covers the following:. Standardization of specific structure sizes in combina-. Walking beam design, with specific rating equation. Design loads and limiting working stresses on other structural components are also included.

Note: Only loads imposed on the structure andor gear reducer by the pol- ished rod load are considered in this specification. Additional loads on the pumping unit imposed by add-on devices attached to the reducer, walking beam, or other structural Components are not part of this specification.

No dimensional requirements, other than stroke length, are established. Rating methods are given only for polished rod capacities; however, allowable working stresses of other structural components for a given polished rod capacity are defined.

Other design criteria such as bearing design, brak- ing capacity, etc. It is recommended that pumping units furnished to this specification adhere to the gear reducer rating, structure ca- pacity, and stroke length as given in Table 2, although the combinations of these items that make up the pumping unit designation need not be identical to those in the table.

The particular combinations in the table are typical, but combi- nations other than those listed are acceptable under this stan- dard see note. This applies to sales information as well as to structure markings. The following equation shall be used for rating conven- tional walking beams as shown in Figure 1 :.

The gross sec-. Note The equation given in 3. With unconventional construction or built-up sections, due regard shall be given to change in loading, to check- ing streiws at all critical sections, and to the existence of stress concentrat- ing factors. The working stress, fcb, for the beam rating equation given in 3. For standard rolled beams having cross sections symmetrical with the horizontal neutral axis, the critical stress will be compres- sion in the lower flange.

The maximum value of this stress, fcb, is the smaller of the values determined from lines 2 and 3 of Table 1. Viewed from the side of the pumping unit with the well head to the right, crank rotation is defined as either clock- wise or counterclockwise.

For all pumping unit geometries, and unless otherwise specified, use the maximum load exerted on the component in question by examining the loads on the component at each 15 degree crank position on the upstroke of the pumping unit. Use polished rod load, W, for all upstroke crack positions. For units with bi-directional rotation and nonsymmetrical torque factors, the direction of rotation f o r design calcula- tions shall be that which results in the highest loading on structural components.

Due consideration shall be given to the direction o f load- ing on all structural bearings and on the structural members supporting these bearings. Note: Allowable stress levels are based on simple stresses without consid- eration of stress risers. Adequate stress concentration factors shall be used when stress mers occur. Design stresses for all structural components shall. If stress risers occur in critical zones of ten- sion members, the limiting stress shall be 0.

For - values of 30 or less, columns may be assumed to be acting in simple compression see 3. Figure 1-Walking. Beam Elements.


API Spec 11E Monogram – Specification for Pumping Units

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