NTERNATIONAL STANDARD (ISO) 3722 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXKIYHAPOAHAA OPIAHW3ALIWA IO CTAHIAPTH3AIWW.ORGANISATION INTERNATIONALE DE NORMALISATION Hydraulic fluid power - Fluid sample containers Qualifying and controlling cleaning methods Transmissions hydrauliques - Flacons de prelevement -- Homologation et controle des methodes de nettoyage First edition - 1976-09-30 ISO 3722-1976 (E) UDC 621.8.032 : 620.115.22 Ref. No. 1SO 3722-1976 (E) Descriptors : hydraulic fluid power, tests, sampling, fiasks, cleaning, inspection, acceptability Price based on 2 pages Copyright International Organization for Standardization Not for Resale FOREWORD ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (lsO Member Bodies). The work of developing International Standards is carried out through 1sO Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up 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. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the ISO Council. InternationalStandardISO 3722 2 was drawn up by Technical Committee ISO/TC 131, Fluid power systems and components, and was circulated to the MemberBodiesinMarch1975 It has been approved by the Member Bodies of the following countries : Australia Hungary Spain Austria India Sweden Belgium Italy Switzerland Brazil Japan Turkey Czechoslovakia Netherlands United Kingdom Finland Poland U.S.A. France Romania U.S.S.R. Germany South Africa, Rep. of Yugoslavia No Member Body expressed disapproval of the document. @ Internatilonal Organization for Standardization, 1976 : Printed in Switzerland without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 3722-1976 (E) Hvdraulic fluid power - Fluid sample containers - Qualifying and controlling cleaning methods 0 INTRODUCTION 3 DEFINITIONS In hydraulic fluid power systems, power is transmitted and 3.1 average outgoing quality limit (AOQL) : The controlled through a liquid under pressure within an maximum percentage of sample containers which may enclosed circuit. The liquid is both a lubricant and power- exceed the required cleanliness level as a process average. transmitting medium. 3.2 clean fluid : Fluid which is compatible with the Reliable system performance requires control of the fluid- particle counting method and the container used and does medium. Qualitative and quantitative determination of not contain more than one-tenth the number of particles particulate contaminant in the fluid medium requires greater than the designated inspection size per 100 ml that precision in obtaining the sample and determining the are allowed in the required cleanliness level. nature and extent of contamination. A clean container is necessary in order not to "contami- 3.3 consecutive acceptance number (N) : The minimum nate" the fluid sample. This International Standard sets number of initial .qualifying inspections required to forth the procedure for qualifying and controlling the establish the acceptability of the cleaning process. cleaning methods for the container. 3.4 inspection ratio (R) : The ratio of the number of randomly selected containers which must be inspected to the number of containers processed. 1 SCOPE AND FIELD OF APPLICATION 3.5 required cleanliness tevel (RCL) : The maximum This International Standard specifies a method for qualify- number of particles greater than the designated inspection ing and controlling the cleaning methods for sample size per 100 ml of sample container volume. 'containers used in conjunction . with contaminational analysis techniques on hydraulic fluids used in industrial, mobile, marine and aerospace hydraulic fluid power 3.6