ISO INTERNATIONAL 12130-1 STANDARD Second edition 2021-04 Plain bearings Hydrodynamic plain tilting pad thrust bearings under steady-state conditions Part 1: Calculation of tilting pad thrust bearings Paliers lisses-Butees hydrodynamiques a patins oscillants fonctionnantenrégimestationnaire- Partie1: Calcul des buteesapatins oscillants Referencenumber IS0 12130-1:2021(E) ISO @ IS0 2021 IS012130-1:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting below or Iso's member body in the country of the requester. ISO copyright office CP 40i : Ch.de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland i IS0 2021-All rights reserved IS0 12130-1:2021(E) Contents Page Foreword ..iv Introduction. 1 Scope. ..1 2 Normativereferences 3 ..1 Terms and definitions 4 Symbols, terms and units. ..1 5 Fundamentals,assumptionsandpremises .5 6 Calculation procedure ..6 6.1 Loading operations .6 6.1.1 General. .6 6.1.2 Wear .6 Mechanical loading 6.1.3 .6 6.1.4 Thermal loading. ..6 6.1.5 Outsideinfluences .6 .7 6.2 Coordinate of centre of pressure 6.3 Load-carrying capacity .7 6.4 Frictional power. ..9 6.5 Lubricantflowrate .9 6.6 Heat balance. .10 6.6.1 General. .10 6.6.2 Heatdissipationbyconvection .10 6.6.3 Heat dissipation byrecirculatinglubrication .11 6.6.4 Mixingprocesses inthelubrication recess. .11 6.7 Minimum lubricantfilmthickness and specificbearingload .13 6.8 Operating conditions .13 6.9 Furtherinfluencefactors. .14 AnnexA (informative)Examplesofcalculation ..15 Bibliography .24 @ IS0 2021 -All rights reserved iii IS0 12130-1:2021(E) Foreword Iso(theInternationalOrganization for Standardization)is a worldwidefederationofnational standards bodies (Iso member bodies). The work of preparing International Standards is normally carried out through Iso technical committees.Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations,governmental and non-governmental, in liaison with Iso,also take part in the work. Iso collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISo/IEc Directives, Part 1. In particular, the different approval criteria needed for the different types of Iso documents should be noted.This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention isdrawntothepossibilitythat someoftheelementsof thisdocumentmaybethe subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. Details of anypatentrights identified duringthe development ofthe document will be in the Introduction and/or on the Iso list of patent declarations received (see www.iso.org/patents). Any trade nameused in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation of the voluntary nature of standards, the meaning of Iso specific terms and expressions related to conformity assessment, as well as information about Iso's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso .org/ iso/foreword .html. This document was prepared by Technical Committee ISo/TC 123, Plain bearings, Subcommittee SC 8, Calculationmethodsforplainbearingsandtheirapplications. This second edition cancels and replaces thefirstedition (IS012130-1:2001),whichhasbeentechnically revised. The main changes compared to the previous