BS 5551-2.6:1992

Committees responsible
National foreword
Introduction
Guide
1 Scope
2 References
3 Notation and symbols
4 Preliminary hypotheses
5 Principle of the sampling plan
5.1 General
5.2 Information
6 Theory of the sampling plan
6.1 Definitions
6.2 Determination of limits
6.3 Use of two non-central t distribution
6.4 Determination of N and N'
7 Practical procedure for the determination of N and
     N'
7.1 Basic information
7.2 Calculation
7.3 Simplified calculation when N' > 30
8 Examples of calculations
8.1 Calculation by the complete process
8.2 Simplified calculation
9 Effect of the values of the various parameters on N
     and K
10 Evaluation of a delivery
Annexes
A Table of values of the standardized normal variable
     u as a function of P
B Table of values of (1 - (a squared))/(a squared)

This sampling plan is applicable to a large delivery of more than 250 t of fertilizer supplied for resale in small lots, each of which would be subject to legislation. Large amount is understood to be 5,000 t, 10,000 t or more. Covers references, notation and symbols, preliminary hypotheses, principle of the sampling plan, general, information, what is determined by the proposed method, theory of the sampling plan, definitions, determination of limits, use of two non-central t distribution, basic information, calculation, examples of calculations, calculation by the complete process and evaluation of a delivery.

This Technical Report presents the sampling theory which has resulted in the definition of the sampling plan described in ISO 8634¹⁾.

The sampling plan is applicable to a large delivery of more than 250 t of fertilizer supplied to another party, for resale, on his own responsibility, in small lots, each of which would be subject to legislation.

By large amount is understood, for example, a full boat-load (5,000 t, 10,000 t or more) thus corresponding to a relatively long period of manufacture, but the theory applies to any delivery of 250 t or more.