This standard is issued under the fixed designation B; the number 1 This test method is under the jurisdiction of ASTM Committee B08 on Metallic. ASTM B_机械/仪表_工程科技_专业资料。 Designation: B – 88 ( Reapproved ) Standard Test Method for Attribute Sampling. Purchase your copy of ASTM B – 88() as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards.
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Worldwide Standards We can source any standard from anywhere in the world. In accordance with Table 3, a sample of items is to be drawn. Please download Chrome or Firefox or view our browser tips. If the units have serial numbers, the serial numbers can be used. Also, Guide B describes the nature of attribute sampling plans astmm the several factors that must be considered in the selection of a sampling asm. NOTE 2—The nature of a destructive test can be such that the tested article can be reclaimed, for example by stripping and reapplying the coating.
After the rst item is taken, the remaining items in the required sample are drawn by selecting every 24th item from the lot until are selected. Sampling plans based on inspection by variables are given in Test Method B The values obtained are used to estimate the number of articles in the lot that do not conform to a sstm limit, for example a minimum thickness. The LQL is a quality level that is considered to be barely tolerable. Therefore, basic to any sampling inspection plan is the willingness of the buyer to accept lots that contain some nonconforming articles.
This standard does not contain the Military Standard’s requirement for tightened inspection when the quality history of a supplier is unsatisfactory.
A characteristic of the coating on the drawn articles is measured. Referenced Documents purchase separately The documents listed below ast referenced within the subject standard but are not provided as part of the ast. Additional plans that may serve these needs are given in Guide B Sampling plans based on inspection by variables are given in Test Method B If you feel that your comments have not received a fair hearing sstm should make your views known to the ASTM Committee on Standards, at the address shown below.
ASTM B602 – 88(2016)
For example, every 9th, 19th, or 24th unit is selected. Instead, an attributes plan must be used. The larger the proportion of nonconforming articles adtm an inspection lot, the more likely it will be that the sample will indicate that the lot is unacceptable.
If the articles are not so mixed, and if zstm is thought to be impractical to mix them, bias axtm result if the entire sample is drawn from a single or a few layers.
At intermediate quality levels of incoming lots, the average quality level of a series of lots will not be as good as in either of the above cases. The larger the sample, the smaller this risk but the larger the cost of inspection.
Astn and continue Learn more about the cookies we use and how to change your settings. It is the responsibility of the user adtm this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Screening is to be used only when required by the purchaser.
For example, if a sample of 50 articles drawn in accordance with Table 2 is found to contain two defectives with respect to thickness and a third one with respect to appearance, the inspection lot is acceptable because although three articles were defective no more than two, the acceptance number, were defective with respect to a single requirement.
The selection of random numbers is made as follows: Random sampling procedures are given in the Annex of this test method. There may be instances in which tighter or looser plans or ones that are more discriminating are desired.
The AQL is the quality level that is considered to be acceptable. If only a few articles in an inspection lot are nonconforming, the chances are that zstm sample will indicate that asmt lot is acceptable; but there is a small chance that the sample will indicate that the lot is unacceptable. There may be cases in which destruction of even these smaller quantities is undesirable.
The possibility exists that some of the uninspected articles are nonconforming. The plan of Table 4, which is used for destructive testing, is not from the Military Standard.
ASTM B – 88() Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
B — 88 5. The poorest average quality level that can result from the use of a given sampling plan when screening of rejected lots is done is called the Average Outgoing Quality Limit AOQL. The faster, easier way to work with standards. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
This standard does not contain the Military Standard’s requirement for tightened inspection when the quality history of a supplier is unsatisfactory. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.
Asm acceptance number applies to each requirement in turn; it is not added.